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     44  1.1  mrg <h1 class="settitle">Host/Target specific installation notes for GCC</h1>
     45  1.1  mrg <a name="index-Specific-1"></a><a name="index-Specific-installation-notes-2"></a><a name="index-Target-specific-installation-3"></a><a name="index-Host-specific-installation-4"></a><a name="index-Target-specific-installation-notes-5"></a>
     46  1.1  mrg Please read this document carefully <em>before</em> installing the
     47  1.1  mrg GNU Compiler Collection on your machine.
     48  1.1  mrg 
     49  1.1  mrg    <p>Note that this list of install notes is <em>not</em> a list of supported
     50  1.1  mrg hosts or targets.  Not all supported hosts and targets are listed
     51  1.1  mrg here, only the ones that require host-specific or target-specific
     52  1.1  mrg information are.
     53  1.1  mrg 
     54  1.1  mrg      <ul>
     55  1.1  mrg <li><a href="#alpha-x-x">alpha*-*-*</a>
     56  1.1  mrg <li><a href="#alpha-dec-osf">alpha*-dec-osf*</a>
     57  1.1  mrg <li><a href="#arc-x-elf">arc-*-elf</a>
     58  1.1  mrg <li><a href="#arm-x-elf">arm-*-elf</a>
     59  1.1  mrg <li><a href="#avr">avr</a>
     60  1.1  mrg <li><a href="#bfin">Blackfin</a>
     61  1.1  mrg <li><a href="#dos">DOS</a>
     62  1.1  mrg <li><a href="#x-x-freebsd">*-*-freebsd*</a>
     63  1.1  mrg <li><a href="#h8300-hms">h8300-hms</a>
     64  1.1  mrg <li><a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
     65  1.1  mrg <li><a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
     66  1.1  mrg <li><a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
     67  1.1  mrg <li><a href="#x-x-linux-gnu">*-*-linux-gnu</a>
     68  1.1  mrg <li><a href="#ix86-x-linux">i?86-*-linux*</a>
     69  1.1  mrg <li><a href="#ix86-x-solaris289">i?86-*-solaris2.[89]</a>
     70  1.1  mrg <li><a href="#ix86-x-solaris210">i?86-*-solaris2.10</a>
     71  1.1  mrg <li><a href="#ia64-x-linux">ia64-*-linux</a>
     72  1.1  mrg <li><a href="#ia64-x-hpux">ia64-*-hpux*</a>
     73  1.1  mrg <li><a href="#x-ibm-aix">*-ibm-aix*</a>
     74  1.1  mrg <li><a href="#iq2000-x-elf">iq2000-*-elf</a>
     75  1.1  mrg <li><a href="#lm32-x-elf">lm32-*-elf</a>
     76  1.1  mrg <li><a href="#lm32-x-uclinux">lm32-*-uclinux</a>
     77  1.1  mrg <li><a href="#m32c-x-elf">m32c-*-elf</a>
     78  1.1  mrg <li><a href="#m32r-x-elf">m32r-*-elf</a>
     79  1.1  mrg <li><a href="#m6811-elf">m6811-elf</a>
     80  1.1  mrg <li><a href="#m6812-elf">m6812-elf</a>
     81  1.1  mrg <li><a href="#m68k-x-x">m68k-*-*</a>
     82  1.1  mrg <li><a href="#m68k-uclinux">m68k-uclinux</a>
     83  1.1  mrg <li><a href="#mep-x-elf">mep-*-elf</a>
     84  1.1  mrg <li><a href="#mips-x-x">mips-*-*</a>
     85  1.1  mrg <li><a href="#mips-sgi-irix5">mips-sgi-irix5</a>
     86  1.1  mrg <li><a href="#mips-sgi-irix6">mips-sgi-irix6</a>
     87  1.1  mrg <li><a href="#powerpc-x-x">powerpc*-*-*</a>
     88  1.1  mrg <li><a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
     89  1.1  mrg <li><a href="#powerpc-x-elf">powerpc-*-elf</a>
     90  1.1  mrg <li><a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
     91  1.1  mrg <li><a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
     92  1.1  mrg <li><a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
     93  1.1  mrg <li><a href="#powerpc-x-eabi">powerpc-*-eabi</a>
     94  1.1  mrg <li><a href="#powerpcle-x-elf">powerpcle-*-elf</a>
     95  1.1  mrg <li><a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
     96  1.1  mrg <li><a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
     97  1.1  mrg <li><a href="#s390-x-linux">s390-*-linux*</a>
     98  1.1  mrg <li><a href="#s390x-x-linux">s390x-*-linux*</a>
     99  1.1  mrg <li><a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    100  1.1  mrg <li><a href="#x-x-solaris2">*-*-solaris2*</a>
    101  1.1  mrg <li><a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    102  1.1  mrg <li><a href="#sparc-sun-solaris27">sparc-sun-solaris2.7</a>
    103  1.1  mrg <li><a href="#sparc-sun-solaris210">sparc-sun-solaris2.10</a>
    104  1.1  mrg <li><a href="#sparc-x-linux">sparc-*-linux*</a>
    105  1.1  mrg <li><a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    106  1.1  mrg <li><a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    107  1.1  mrg <li><a href="#x-x-vxworks">*-*-vxworks*</a>
    108  1.1  mrg <li><a href="#x86-64-x-x">x86_64-*-*</a> amd64-*-*
    109  1.1  mrg <li><a href="#xtensa-x-elf">xtensa*-*-elf</a>
    110  1.1  mrg <li><a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    111  1.1  mrg <li><a href="#windows">Microsoft Windows</a>
    112  1.1  mrg <li><a href="#x-x-cygwin">*-*-cygwin</a>
    113  1.1  mrg <li><a href="#x-x-interix">*-*-interix</a>
    114  1.1  mrg <li><a href="#x-x-mingw32">*-*-mingw32</a>
    115  1.1  mrg <li><a href="#os2">OS/2</a>
    116  1.1  mrg <li><a href="#older">Older systems</a>
    117  1.1  mrg </ul>
    118  1.1  mrg 
    119  1.1  mrg      <ul>
    120  1.1  mrg <li><a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.) 
    121  1.1  mrg </ul>
    122  1.1  mrg 
    123  1.1  mrg    <p><!-- -------- host/target specific issues start here ---------------- -->
    124  1.1  mrg <hr />
    125  1.1  mrg 
    126  1.1  mrg <h3 class="heading"><a name="TOC0"></a><a name="alpha_002dx_002dx"></a>alpha*-*-*</h3>
    127  1.1  mrg 
    128  1.1  mrg <p>This section contains general configuration information for all
    129  1.1  mrg alpha-based platforms using ELF (in particular, ignore this section for
    130  1.1  mrg DEC OSF/1, Digital UNIX and Tru64 UNIX).  In addition to reading this
    131  1.1  mrg section, please read all other sections that match your target.
    132  1.1  mrg 
    133  1.1  mrg    <p>We require binutils 2.11.2 or newer. 
    134  1.1  mrg Previous binutils releases had a number of problems with DWARF 2
    135  1.1  mrg debugging information, not the least of which is incorrect linking of
    136  1.1  mrg shared libraries.
    137  1.1  mrg 
    138  1.1  mrg    <p><hr />
    139  1.1  mrg 
    140  1.1  mrg <h3 class="heading"><a name="TOC1"></a><a name="alpha_002ddec_002dosf"></a>alpha*-dec-osf*</h3>
    141  1.1  mrg 
    142  1.1  mrg <p>Systems using processors that implement the DEC Alpha architecture and
    143  1.1  mrg are running the DEC/Compaq/HP Unix (DEC OSF/1, Digital UNIX, or Compaq/HP
    144  1.1  mrg Tru64 UNIX) operating system, for example the DEC Alpha AXP systems.
    145  1.1  mrg 
    146  1.1  mrg    <p>As of GCC 3.2, versions before <code>alpha*-dec-osf4</code> are no longer
    147  1.1  mrg supported.  (These are the versions which identify themselves as DEC
    148  1.1  mrg OSF/1.)  As of GCC 4.5, support for Tru64 UNIX V4.0 and V5.0 has been
    149  1.1  mrg obsoleted, but can still be enabled by configuring with
    150  1.1  mrg <samp><span class="option">--enable-obsolete</span></samp>.  Support will be removed in GCC 4.6.
    151  1.1  mrg 
    152  1.1  mrg    <p>On Tru64 UNIX, virtual memory exhausted bootstrap failures
    153  1.1  mrg may be fixed by reconfiguring Kernel Virtual Memory and Swap parameters
    154  1.1  mrg per the <samp><span class="command">/usr/sbin/sys_check</span></samp> Tuning Suggestions,
    155  1.1  mrg or applying the patch in
    156  1.1  mrg <a href="http://gcc.gnu.org/ml/gcc/2002-08/msg00822.html">http://gcc.gnu.org/ml/gcc/2002-08/msg00822.html</a>.  Depending on
    157  1.1  mrg the OS version used, you need a data segment size between 512 MB and
    158  1.1  mrg 1 GB, so simply use <samp><span class="command">ulimit -Sd unlimited</span></samp>.
    159  1.1  mrg 
    160  1.1  mrg    <p>As of GNU binutils 2.20.1, neither GNU <samp><span class="command">as</span></samp> nor GNU <samp><span class="command">ld</span></samp>
    161  1.1  mrg are supported on Tru64 UNIX, so you must not configure GCC with
    162  1.1  mrg <samp><span class="option">--with-gnu-as</span></samp> or <samp><span class="option">--with-gnu-ld</span></samp>.
    163  1.1  mrg 
    164  1.1  mrg    <p>GCC writes a &lsquo;<samp><span class="samp">.verstamp</span></samp>&rsquo; directive to the assembler output file
    165  1.1  mrg unless it is built as a cross-compiler.  It gets the version to use from
    166  1.1  mrg the system header file <samp><span class="file">/usr/include/stamp.h</span></samp>.  If you install a
    167  1.1  mrg new version of Tru64 UNIX, you should rebuild GCC to pick up the new version
    168  1.1  mrg stamp.
    169  1.1  mrg 
    170  1.1  mrg    <p>GCC now supports both the native (ECOFF) debugging format used by DBX
    171  1.1  mrg and GDB and an encapsulated STABS format for use only with GDB.  See the
    172  1.1  mrg discussion of the <samp><span class="option">--with-stabs</span></samp> option of <samp><span class="file">configure</span></samp> above
    173  1.1  mrg for more information on these formats and how to select them. 
    174  1.1  mrg <!-- FIXME: does this work at all?  If so, perhaps make default. -->
    175  1.1  mrg 
    176  1.1  mrg    <p>There is a bug in DEC's assembler that produces incorrect line numbers
    177  1.1  mrg for ECOFF format when the &lsquo;<samp><span class="samp">.align</span></samp>&rsquo; directive is used.  To work
    178  1.1  mrg around this problem, GCC will not emit such alignment directives
    179  1.1  mrg while writing ECOFF format debugging information even if optimization is
    180  1.1  mrg being performed.  Unfortunately, this has the very undesirable
    181  1.1  mrg side-effect that code addresses when <samp><span class="option">-O</span></samp> is specified are
    182  1.1  mrg different depending on whether or not <samp><span class="option">-g</span></samp> is also specified.
    183  1.1  mrg 
    184  1.1  mrg    <p>To avoid this behavior, specify <samp><span class="option">-gstabs+</span></samp> and use GDB instead of
    185  1.1  mrg DBX.  DEC is now aware of this problem with the assembler and hopes to
    186  1.1  mrg provide a fix shortly.
    187  1.1  mrg 
    188  1.1  mrg <!-- FIXME: still applicable? -->
    189  1.1  mrg    <p><hr />
    190  1.1  mrg 
    191  1.1  mrg <h3 class="heading"><a name="TOC2"></a><a name="arc_002dx_002delf"></a>arc-*-elf</h3>
    192  1.1  mrg 
    193  1.1  mrg <p>Argonaut ARC processor. 
    194  1.1  mrg This configuration is intended for embedded systems.
    195  1.1  mrg 
    196  1.1  mrg    <p><hr />
    197  1.1  mrg 
    198  1.1  mrg <h3 class="heading"><a name="TOC3"></a><a name="arm_002dx_002delf"></a>arm-*-elf</h3>
    199  1.1  mrg 
    200  1.1  mrg <p>ARM-family processors.  Subtargets that use the ELF object format
    201  1.1  mrg require GNU binutils 2.13 or newer.  Such subtargets include:
    202  1.1  mrg <code>arm-*-freebsd</code>, <code>arm-*-netbsdelf</code>, <code>arm-*-*linux</code>
    203  1.1  mrg and <code>arm-*-rtems</code>.
    204  1.1  mrg 
    205  1.1  mrg    <p><hr />
    206  1.1  mrg 
    207  1.1  mrg <h3 class="heading"><a name="TOC4"></a><a name="avr"></a>avr</h3>
    208  1.1  mrg 
    209  1.1  mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    210  1.1  mrg applications.  There are no standard Unix configurations. 
    211  1.1  mrg See &ldquo;AVR Options&rdquo; in the main manual
    212  1.1  mrg for the list of supported MCU types.
    213  1.1  mrg 
    214  1.1  mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=avr --enable-languages="c"</span></samp>&rsquo; to configure GCC.
    215  1.1  mrg 
    216  1.1  mrg    <p>Further installation notes and other useful information about AVR tools
    217  1.1  mrg can also be obtained from:
    218  1.1  mrg 
    219  1.1  mrg      <ul>
    220  1.1  mrg <li><a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    221  1.1  mrg <li><a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    222  1.1  mrg </ul>
    223  1.1  mrg 
    224  1.1  mrg    <p>We <em>strongly</em> recommend using binutils 2.13 or newer.
    225  1.1  mrg 
    226  1.1  mrg    <p>The following error:
    227  1.1  mrg <pre class="smallexample">       Error: register required
    228  1.1  mrg </pre>
    229  1.1  mrg    <p>indicates that you should upgrade to a newer version of the binutils.
    230  1.1  mrg 
    231  1.1  mrg    <p><hr />
    232  1.1  mrg 
    233  1.1  mrg <h3 class="heading"><a name="TOC5"></a><a name="bfin"></a>Blackfin</h3>
    234  1.1  mrg 
    235  1.1  mrg <p>The Blackfin processor, an Analog Devices DSP. 
    236  1.1  mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    237  1.1  mrg 
    238  1.1  mrg    <p>More information, and a version of binutils with support for this processor,
    239  1.1  mrg is available at <a href="http://blackfin.uclinux.org">http://blackfin.uclinux.org</a>
    240  1.1  mrg 
    241  1.1  mrg    <p><hr />
    242  1.1  mrg 
    243  1.1  mrg <h3 class="heading"><a name="TOC6"></a><a name="cris"></a>CRIS</h3>
    244  1.1  mrg 
    245  1.1  mrg <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    246  1.1  mrg series.  These are used in embedded applications.
    247  1.1  mrg 
    248  1.1  mrg    <p>See &ldquo;CRIS Options&rdquo; in the main manual
    249  1.1  mrg for a list of CRIS-specific options.
    250  1.1  mrg 
    251  1.1  mrg    <p>There are a few different CRIS targets:
    252  1.1  mrg      <dl>
    253  1.1  mrg <dt><code>cris-axis-elf</code><dd>Mainly for monolithic embedded systems.  Includes a multilib for the
    254  1.1  mrg &lsquo;<samp><span class="samp">v10</span></samp>&rsquo; core used in &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo;. 
    255  1.1  mrg <br><dt><code>cris-axis-linux-gnu</code><dd>A GNU/Linux port for the CRIS architecture, currently targeting
    256  1.1  mrg &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo; by default. 
    257  1.1  mrg </dl>
    258  1.1  mrg 
    259  1.1  mrg    <p>For <code>cris-axis-elf</code> you need binutils 2.11
    260  1.1  mrg or newer.  For <code>cris-axis-linux-gnu</code> you need binutils 2.12 or newer.
    261  1.1  mrg 
    262  1.1  mrg    <p>Pre-packaged tools can be obtained from
    263  1.1  mrg <a href="ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/">ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/</a>.  More
    264  1.1  mrg information about this platform is available at
    265  1.1  mrg <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    266  1.1  mrg 
    267  1.1  mrg    <p><hr />
    268  1.1  mrg 
    269  1.1  mrg <h3 class="heading"><a name="TOC7"></a><a name="crx"></a>CRX</h3>
    270  1.1  mrg 
    271  1.1  mrg <p>The CRX CompactRISC architecture is a low-power 32-bit architecture with
    272  1.1  mrg fast context switching and architectural extensibility features.
    273  1.1  mrg 
    274  1.1  mrg    <p>See &ldquo;CRX Options&rdquo; in the main manual for a list of CRX-specific options.
    275  1.1  mrg 
    276  1.1  mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=crx-elf --enable-languages=c,c++</span></samp>&rsquo; to configure
    277  1.1  mrg GCC for building a CRX cross-compiler. The option &lsquo;<samp><span class="samp">--target=crx-elf</span></samp>&rsquo;
    278  1.1  mrg is also used to build the &lsquo;<samp><span class="samp">newlib</span></samp>&rsquo; C library for CRX.
    279  1.1  mrg 
    280  1.1  mrg    <p>It is also possible to build libstdc++-v3 for the CRX architecture. This
    281  1.1  mrg needs to be done in a separate step with the following configure settings:
    282  1.1  mrg &lsquo;<samp><span class="samp">gcc/libstdc++-v3/configure --host=crx-elf --with-newlib
    283  1.1  mrg --enable-sjlj-exceptions --enable-cxx-flags='-fexceptions -frtti'</span></samp>&rsquo;
    284  1.1  mrg 
    285  1.1  mrg    <p><hr />
    286  1.1  mrg 
    287  1.1  mrg <h3 class="heading"><a name="TOC8"></a><a name="dos"></a>DOS</h3>
    288  1.1  mrg 
    289  1.1  mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    290  1.1  mrg 
    291  1.1  mrg    <p>You cannot install GCC by itself on MSDOS; it will not compile under
    292  1.1  mrg any MSDOS compiler except itself.  You need to get the complete
    293  1.1  mrg compilation package DJGPP, which includes binaries as well as sources,
    294  1.1  mrg and includes all the necessary compilation tools and libraries.
    295  1.1  mrg 
    296  1.1  mrg    <p><hr />
    297  1.1  mrg 
    298  1.1  mrg <h3 class="heading"><a name="TOC9"></a><a name="x_002dx_002dfreebsd"></a>*-*-freebsd*</h3>
    299  1.1  mrg 
    300  1.1  mrg <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    301  1.1  mrg FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    302  1.1  mrg discontinued in GCC 4.0.
    303  1.1  mrg 
    304  1.1  mrg    <p>In GCC 4.5, we enabled the use of <code>dl_iterate_phdr</code> inside boehm-gc on
    305  1.1  mrg FreeBSD 7 or later.  In order to better match the configuration of the
    306  1.1  mrg FreeBSD system compiler: We also enabled the check to see if libc
    307  1.1  mrg provides SSP support (which it does on FreeBSD 7), the use of
    308  1.1  mrg <code>dl_iterate_phdr</code> inside <samp><span class="file">libgcc_s.so.1</span></samp> (on FreeBSD 7 or later)
    309  1.1  mrg and the use of <code>__cxa_atexit</code> by default (on FreeBSD 6 or later).
    310  1.1  mrg 
    311  1.1  mrg    <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    312  1.1  mrg for all CPU architectures.  You may use <samp><span class="option">-gstabs</span></samp> instead of
    313  1.1  mrg <samp><span class="option">-g</span></samp>, if you really want the old debugging format.  There are
    314  1.1  mrg no known issues with mixing object files and libraries with different
    315  1.1  mrg debugging formats.  Otherwise, this release of GCC should now match
    316  1.1  mrg more of the configuration used in the stock FreeBSD configuration of
    317  1.1  mrg GCC.  In particular, <samp><span class="option">--enable-threads</span></samp> is now configured by
    318  1.1  mrg default.  However, as a general user, do not attempt to replace the
    319  1.1  mrg system compiler with this release.  Known to bootstrap and check with
    320  1.1  mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    321  1.1  mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    322  1.1  mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    323  1.1  mrg 
    324  1.1  mrg    <p>The version of binutils installed in <samp><span class="file">/usr/bin</span></samp> probably works
    325  1.1  mrg with this release of GCC.  Bootstrapping against the latest GNU
    326  1.1  mrg binutils and/or the version found in <samp><span class="file">/usr/ports/devel/binutils</span></samp> has
    327  1.1  mrg been known to enable additional features and improve overall testsuite
    328  1.1  mrg results.  However, it is currently known that boehm-gc (which itself
    329  1.1  mrg is required for java) may not configure properly on FreeBSD prior to
    330  1.1  mrg the FreeBSD 7.0 release with GNU binutils after 2.16.1.
    331  1.1  mrg 
    332  1.1  mrg    <p><hr />
    333  1.1  mrg 
    334  1.1  mrg <h3 class="heading"><a name="TOC10"></a><a name="h8300_002dhms"></a>h8300-hms</h3>
    335  1.1  mrg 
    336  1.1  mrg <p>Renesas H8/300 series of processors.
    337  1.1  mrg 
    338  1.1  mrg    <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    339  1.1  mrg 
    340  1.1  mrg    <p>The calling convention and structure layout has changed in release 2.6. 
    341  1.1  mrg All code must be recompiled.  The calling convention now passes the
    342  1.1  mrg first three arguments in function calls in registers.  Structures are no
    343  1.1  mrg longer a multiple of 2 bytes.
    344  1.1  mrg 
    345  1.1  mrg    <p><hr />
    346  1.1  mrg 
    347  1.1  mrg <h3 class="heading"><a name="TOC11"></a><a name="hppa_002dhp_002dhpux"></a>hppa*-hp-hpux*</h3>
    348  1.1  mrg 
    349  1.1  mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    350  1.1  mrg 
    351  1.1  mrg    <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    352  1.1  mrg later is recommended.
    353  1.1  mrg 
    354  1.1  mrg    <p>It may be helpful to configure GCC with the
    355  1.1  mrg <a href="./configure.html#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> and
    356  1.1  mrg <samp><span class="option">--with-as=...</span></samp> options to ensure that GCC can find GAS.
    357  1.1  mrg 
    358  1.1  mrg    <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    359  1.1  mrg not work.  It shouldn't be used with any languages other than C due to its
    360  1.1  mrg many limitations.
    361  1.1  mrg 
    362  1.1  mrg    <p>Specifically, <samp><span class="option">-g</span></samp> does not work (HP-UX uses a peculiar debugging
    363  1.1  mrg format which GCC does not know about).  It also inserts timestamps
    364  1.1  mrg into each object file it creates, causing the 3-stage comparison test to
    365  1.1  mrg fail during a bootstrap.  You should be able to continue by saying
    366  1.1  mrg &lsquo;<samp><span class="samp">make all-host all-target</span></samp>&rsquo; after getting the failure from &lsquo;<samp><span class="samp">make</span></samp>&rsquo;.
    367  1.1  mrg 
    368  1.1  mrg    <p>Various GCC features are not supported.  For example, it does not support weak
    369  1.1  mrg symbols or alias definitions.  As a result, explicit template instantiations
    370  1.1  mrg are required when using C++.  This makes it difficult if not impossible to
    371  1.1  mrg build many C++ applications.
    372  1.1  mrg 
    373  1.1  mrg    <p>There are two default scheduling models for instructions.  These are
    374  1.1  mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    375  1.1  mrg architecture specified for the target machine when configuring. 
    376  1.1  mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    377  1.1  mrg the target is a &lsquo;<samp><span class="samp">hppa1*</span></samp>&rsquo; machine.
    378  1.1  mrg 
    379  1.1  mrg    <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    380  1.1  mrg it is important to completely specify the machine architecture when
    381  1.1  mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    382  1.1  mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    383  1.1  mrg default scheduling model is desired.
    384  1.1  mrg 
    385  1.1  mrg    <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    386  1.1  mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later. 
    387  1.1  mrg This namespace change might cause problems when bootstrapping with
    388  1.1  mrg an earlier version of GCC or the HP compiler as essentially the same
    389  1.1  mrg namespace is required for an entire build.  This problem can be avoided
    390  1.1  mrg in a number of ways.  With HP cc, <samp><span class="env">UNIX_STD</span></samp> can be set to &lsquo;<samp><span class="samp">95</span></samp>&rsquo;
    391  1.1  mrg or &lsquo;<samp><span class="samp">98</span></samp>&rsquo;.  Another way is to add an appropriate set of predefines
    392  1.1  mrg to <samp><span class="env">CC</span></samp>.  The description for the <samp><span class="option">munix=</span></samp> option contains
    393  1.1  mrg a list of the predefines used with each standard.
    394  1.1  mrg 
    395  1.1  mrg    <p>More specific information to &lsquo;<samp><span class="samp">hppa*-hp-hpux*</span></samp>&rsquo; targets follows.
    396  1.1  mrg 
    397  1.1  mrg    <p><hr />
    398  1.1  mrg 
    399  1.1  mrg <h3 class="heading"><a name="TOC12"></a><a name="hppa_002dhp_002dhpux10"></a>hppa*-hp-hpux10</h3>
    400  1.1  mrg 
    401  1.1  mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    402  1.1  mrg <code>PHCO_19798</code> from HP.
    403  1.1  mrg 
    404  1.1  mrg    <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    405  1.1  mrg used for one-only code and data.  This resolves many of the previous
    406  1.1  mrg problems in using C++ on this target.  However, the ABI is not compatible
    407  1.1  mrg with the one implemented under HP-UX 11 using secondary definitions.
    408  1.1  mrg 
    409  1.1  mrg    <p><hr />
    410  1.1  mrg 
    411  1.1  mrg <h3 class="heading"><a name="TOC13"></a><a name="hppa_002dhp_002dhpux11"></a>hppa*-hp-hpux11</h3>
    412  1.1  mrg 
    413  1.1  mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    414  1.1  mrg be used to compile GCC 3.0 and up.
    415  1.1  mrg 
    416  1.1  mrg    <p>The libffi and libjava libraries haven't been ported to 64-bit HP-UX and don't build.
    417  1.1  mrg 
    418  1.1  mrg    <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    419  1.1  mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    420  1.1  mrg to build the Ada language as it can't be bootstrapped using C.  Ada is
    421  1.1  mrg only available for the 32-bit PA-RISC runtime.
    422  1.1  mrg 
    423  1.1  mrg    <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    424  1.1  mrg bundled compiler supports only traditional C; you will need either HP's
    425  1.1  mrg unbundled compiler, or a binary distribution of GCC.
    426  1.1  mrg 
    427  1.1  mrg    <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    428  1.1  mrg but the process requires several steps.  GCC 3.3 can then be used to
    429  1.1  mrg build later versions.  The fastjar program contains ISO C code and
    430  1.1  mrg can't be built with the HP bundled compiler.  This problem can be
    431  1.1  mrg avoided by not building the Java language.  For example, use the
    432  1.1  mrg <samp><span class="option">--enable-languages="c,c++,f77,objc"</span></samp> option in your configure
    433  1.1  mrg command.
    434  1.1  mrg 
    435  1.1  mrg    <p>There are several possible approaches to building the distribution. 
    436  1.1  mrg Binutils can be built first using the HP tools.  Then, the GCC
    437  1.1  mrg distribution can be built.  The second approach is to build GCC
    438  1.1  mrg first using the HP tools, then build binutils, then rebuild GCC. 
    439  1.1  mrg There have been problems with various binary distributions, so it
    440  1.1  mrg is best not to start from a binary distribution.
    441  1.1  mrg 
    442  1.1  mrg    <p>On 64-bit capable systems, there are two distinct targets.  Different
    443  1.1  mrg installation prefixes must be used if both are to be installed on
    444  1.1  mrg the same system.  The &lsquo;<samp><span class="samp">hppa[1-2]*-hp-hpux11*</span></samp>&rsquo; target generates code
    445  1.1  mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker. 
    446  1.1  mrg The &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target generates 64-bit code for the
    447  1.1  mrg PA-RISC 2.0 architecture.
    448  1.1  mrg 
    449  1.1  mrg    <p>The script config.guess now selects the target type based on the compiler
    450  1.1  mrg detected during configuration.  You must define <samp><span class="env">PATH</span></samp> or <samp><span class="env">CC</span></samp> so
    451  1.1  mrg that configure finds an appropriate compiler for the initial bootstrap. 
    452  1.1  mrg When <samp><span class="env">CC</span></samp> is used, the definition should contain the options that are
    453  1.1  mrg needed whenever <samp><span class="env">CC</span></samp> is used.
    454  1.1  mrg 
    455  1.1  mrg    <p>Specifically, options that determine the runtime architecture must be
    456  1.1  mrg in <samp><span class="env">CC</span></samp> to correctly select the target for the build.  It is also
    457  1.1  mrg convenient to place many other compiler options in <samp><span class="env">CC</span></samp>.  For example,
    458  1.1  mrg <samp><span class="env">CC="cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE"</span></samp>
    459  1.1  mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    460  1.1  mrg 64-bit K&amp;R/bundled mode.  The <samp><span class="option">+DA2.0W</span></samp> option will result in
    461  1.1  mrg the automatic selection of the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target.  The
    462  1.1  mrg macro definition table of cpp needs to be increased for a successful
    463  1.1  mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    464  1.1  mrg be defined when building with the bundled compiler, or when using the
    465  1.1  mrg <samp><span class="option">-Ac</span></samp> option.  These defines aren't necessary with <samp><span class="option">-Ae</span></samp>.
    466  1.1  mrg 
    467  1.1  mrg    <p>It is best to explicitly configure the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target
    468  1.1  mrg with the <samp><span class="option">--with-ld=...</span></samp> option.  This overrides the standard
    469  1.1  mrg search for ld.  The two linkers supported on this target require different
    470  1.1  mrg commands.  The default linker is determined during configuration.  As a
    471  1.1  mrg result, it's not possible to switch linkers in the middle of a GCC build. 
    472  1.1  mrg This has been reported to sometimes occur in unified builds of binutils
    473  1.1  mrg and GCC.
    474  1.1  mrg 
    475  1.1  mrg    <p>A recent linker patch must be installed for the correct operation of
    476  1.1  mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    477  1.1  mrg oldest linker patches that are known to work.  They are for HP-UX
    478  1.1  mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    479  1.1  mrg <code>PHSS_24304</code>, might be usable but it hasn't been tested.  These
    480  1.1  mrg patches have been superseded.  Consult the HP patch database to obtain
    481  1.1  mrg the currently recommended linker patch for your system.
    482  1.1  mrg 
    483  1.1  mrg    <p>The patches are necessary for the support of weak symbols on the
    484  1.1  mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    485  1.1  mrg symbols are implemented using SOM secondary definition symbols.  Prior
    486  1.1  mrg to HP-UX 11, there are bugs in the linker support for secondary symbols. 
    487  1.1  mrg The patches correct a problem of linker core dumps creating shared
    488  1.1  mrg libraries containing secondary symbols, as well as various other
    489  1.1  mrg linking issues involving secondary symbols.
    490  1.1  mrg 
    491  1.1  mrg    <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    492  1.1  mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    493  1.1  mrg uses the linker <samp><span class="option">+init</span></samp> and <samp><span class="option">+fini</span></samp> options for the same
    494  1.1  mrg purpose.  The patches correct various problems with the +init/+fini
    495  1.1  mrg options, including program core dumps.  Binutils 2.14 corrects a
    496  1.1  mrg problem on the 64-bit port resulting from HP's non-standard use of
    497  1.1  mrg the .init and .fini sections for array initializers and finalizers.
    498  1.1  mrg 
    499  1.1  mrg    <p>Although the HP and GNU linkers are both supported for the
    500  1.1  mrg &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target, it is strongly recommended that the
    501  1.1  mrg HP linker be used for link editing on this target.
    502  1.1  mrg 
    503  1.1  mrg    <p>At this time, the GNU linker does not support the creation of long
    504  1.1  mrg branch stubs.  As a result, it can't successfully link binaries
    505  1.1  mrg containing branch offsets larger than 8 megabytes.  In addition,
    506  1.1  mrg there are problems linking shared libraries, linking executables
    507  1.1  mrg with <samp><span class="option">-static</span></samp>, and with dwarf2 unwind and exception support. 
    508  1.1  mrg It also doesn't provide stubs for internal calls to global functions
    509  1.1  mrg in shared libraries, so these calls can't be overloaded.
    510  1.1  mrg 
    511  1.1  mrg    <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    512  1.1  mrg versioning is not supported.  It may be necessary to disable symbol
    513  1.1  mrg versioning with <samp><span class="option">--disable-symvers</span></samp> when using GNU ld.
    514  1.1  mrg 
    515  1.1  mrg    <p>POSIX threads are the default.  The optional DCE thread library is not
    516  1.1  mrg supported, so <samp><span class="option">--enable-threads=dce</span></samp> does not work.
    517  1.1  mrg 
    518  1.1  mrg    <p><hr />
    519  1.1  mrg 
    520  1.1  mrg <h3 class="heading"><a name="TOC14"></a><a name="x_002dx_002dlinux_002dgnu"></a>*-*-linux-gnu</h3>
    521  1.1  mrg 
    522  1.1  mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    523  1.1  mrg in glibc 2.2.5 and later.  More information is available in the
    524  1.1  mrg libstdc++-v3 documentation.
    525  1.1  mrg 
    526  1.1  mrg    <p><hr />
    527  1.1  mrg 
    528  1.1  mrg <h3 class="heading"><a name="TOC15"></a><a name="ix86_002dx_002dlinux"></a>i?86-*-linux*</h3>
    529  1.1  mrg 
    530  1.1  mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform. 
    531  1.1  mrg See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    532  1.1  mrg 
    533  1.1  mrg    <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    534  1.1  mrg possible you have a hardware problem.  Further information on this can be
    535  1.1  mrg found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    536  1.1  mrg 
    537  1.1  mrg    <p><hr />
    538  1.1  mrg 
    539  1.1  mrg <h3 class="heading"><a name="TOC16"></a><a name="ix86_002dx_002dsolaris289"></a>i?86-*-solaris2.[89]</h3>
    540  1.1  mrg 
    541  1.1  mrg <p>The Sun assembler in Solaris 8 and 9 has several bugs and limitations. 
    542  1.1  mrg While GCC works around them, several features are missing, so it is
    543  1.1  mrg <!-- FIXME: which ones? -->
    544  1.1  mrg recommended to use the GNU assembler instead.  There is no bundled
    545  1.1  mrg version, but the current version, from GNU binutils 2.20.1, is known to
    546  1.1  mrg work.
    547  1.1  mrg 
    548  1.1  mrg    <p>Solaris~2/x86 doesn't support the execution of SSE/SSE2 instructions
    549  1.1  mrg before Solaris~9 4/04, even if the CPU supports them.  Programs will
    550  1.1  mrg receive <code>SIGILL</code> if they try.  The fix is available both in
    551  1.1  mrg Solaris~9 Update~6 and kernel patch 112234-12 or newer.  There is no
    552  1.1  mrg corresponding patch for Solaris 8.  To avoid this problem,
    553  1.1  mrg <samp><span class="option">-march</span></samp> defaults to &lsquo;<samp><span class="samp">pentiumpro</span></samp>&rsquo; on Solaris 8 and 9.  If
    554  1.1  mrg you have the patch installed, you can configure GCC with an appropriate
    555  1.1  mrg <samp><span class="option">--with-arch</span></samp> option, but need GNU <samp><span class="command">as</span></samp> for SSE2 support.
    556  1.1  mrg 
    557  1.1  mrg    <p><hr />
    558  1.1  mrg 
    559  1.1  mrg <h3 class="heading"><a name="TOC17"></a><a name="ix86_002dx_002dsolaris210"></a>i?86-*-solaris2.10</h3>
    560  1.1  mrg 
    561  1.1  mrg <p>Use this for Solaris 10 or later on x86 and x86-64 systems.  This
    562  1.1  mrg configuration is supported by GCC 4.0 and later versions only.  Unlike
    563  1.1  mrg &lsquo;<samp><span class="samp">sparcv9-sun-solaris2*</span></samp>&rsquo;, there is no corresponding 64-bit
    564  1.1  mrg configuration like &lsquo;<samp><span class="samp">amd64-*-solaris2*</span></samp>&rsquo; or &lsquo;<samp><span class="samp">x86_64-*-solaris2*</span></samp>&rsquo;. 
    565  1.1  mrg <!-- FIXME: will there ever be? -->
    566  1.1  mrg 
    567  1.1  mrg    <p>It is recommended that you configure GCC to use the GNU assembler, in
    568  1.1  mrg <samp><span class="file">/usr/sfw/bin/gas</span></samp>.  The versions included in Solaris 10, from GNU
    569  1.1  mrg binutils 2.15, and Solaris 11, from GNU binutils 2.19, work fine,
    570  1.1  mrg although the current version, from GNU binutils
    571  1.1  mrg 2.20.1, is known to work, too.  Recent versions of the Sun assembler in
    572  1.1  mrg <samp><span class="file">/usr/ccs/bin/as</span></samp> work almost as well, though. 
    573  1.1  mrg <!-- FIXME: as patch requirements? -->
    574  1.1  mrg 
    575  1.1  mrg    <p>For linking, the Sun linker, is preferred.  If you want to use the GNU
    576  1.1  mrg linker instead, which is available in <samp><span class="file">/usr/sfw/bin/gld</span></samp>, note that
    577  1.1  mrg due to a packaging bug the version in Solaris 10, from GNU binutils
    578  1.1  mrg 2.15, cannot be used, while the version in Solaris 11, from GNU binutils
    579  1.1  mrg 2.19, works, as does the latest version, from GNU binutils 2.20.1.
    580  1.1  mrg 
    581  1.1  mrg    <p>To use GNU <samp><span class="command">as</span></samp>, configure with the options
    582  1.1  mrg <samp><span class="option">--with-gnu-as --with-as=/usr/sfw/bin/gas</span></samp>.  It may be necessary
    583  1.1  mrg to configure with <samp><span class="option">--without-gnu-ld --with-ld=/usr/ccs/bin/ld</span></samp> to
    584  1.1  mrg guarantee use of Sun <samp><span class="command">ld</span></samp>. 
    585  1.1  mrg <!-- FIXME: why -without-gnu-ld -with-ld? -->
    586  1.1  mrg 
    587  1.1  mrg    <p><hr />
    588  1.1  mrg 
    589  1.1  mrg <h3 class="heading"><a name="TOC18"></a><a name="ia64_002dx_002dlinux"></a>ia64-*-linux</h3>
    590  1.1  mrg 
    591  1.1  mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    592  1.1  mrg running GNU/Linux.
    593  1.1  mrg 
    594  1.1  mrg    <p>If you are using the installed system libunwind library with
    595  1.1  mrg <samp><span class="option">--with-system-libunwind</span></samp>, then you must use libunwind 0.98 or
    596  1.1  mrg later.
    597  1.1  mrg 
    598  1.1  mrg    <p>None of the following versions of GCC has an ABI that is compatible
    599  1.1  mrg with any of the other versions in this list, with the exception that
    600  1.1  mrg Red Hat 2.96 and Trillian 000171 are compatible with each other:
    601  1.1  mrg 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. 
    602  1.1  mrg This primarily affects C++ programs and programs that create shared libraries. 
    603  1.1  mrg GCC 3.1 or later is recommended for compiling linux, the kernel. 
    604  1.1  mrg As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    605  1.1  mrg more major ABI changes are expected.
    606  1.1  mrg 
    607  1.1  mrg    <p><hr />
    608  1.1  mrg 
    609  1.1  mrg <h3 class="heading"><a name="TOC19"></a><a name="ia64_002dx_002dhpux"></a>ia64-*-hpux*</h3>
    610  1.1  mrg 
    611  1.1  mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    612  1.1  mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    613  1.1  mrg the option <samp><span class="option">--with-gnu-as</span></samp> may be necessary.
    614  1.1  mrg 
    615  1.1  mrg    <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    616  1.1  mrg GCC versions 3.2.3 and earlier, <samp><span class="option">--enable-libunwind-exceptions</span></samp>
    617  1.1  mrg is required to build GCC.  For GCC 3.3 and later, this is the default. 
    618  1.1  mrg For gcc 3.4.3 and later, <samp><span class="option">--enable-libunwind-exceptions</span></samp> is
    619  1.1  mrg removed and the system libunwind library will always be used.
    620  1.1  mrg 
    621  1.1  mrg    <p><hr />
    622  1.1  mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    623  1.1  mrg 
    624  1.1  mrg <h3 class="heading"><a name="TOC20"></a><a name="x_002dibm_002daix"></a>*-ibm-aix*</h3>
    625  1.1  mrg 
    626  1.1  mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4. 
    627  1.1  mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    628  1.1  mrg 
    629  1.1  mrg    <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    630  1.1  mrg process resource limits (ulimit).  Hard limits are configured in the
    631  1.1  mrg <samp><span class="file">/etc/security/limits</span></samp> system configuration file.
    632  1.1  mrg 
    633  1.1  mrg    <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    634  1.1  mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    635  1.1  mrg requires a larger data segment, which can be enabled through the
    636  1.1  mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    637  1.1  mrg 
    638  1.1  mrg <pre class="smallexample">        % LDR_CNTRL=MAXDATA=0x50000000
    639  1.1  mrg         % export LDR_CNTRL
    640  1.1  mrg </pre>
    641  1.1  mrg    <p>One can start with a pre-compiled version of GCC to build from
    642  1.1  mrg sources.  One may delete GCC's &ldquo;fixed&rdquo; header files when starting
    643  1.1  mrg with a version of GCC built for an earlier release of AIX.
    644  1.1  mrg 
    645  1.1  mrg    <p>To speed up the configuration phases of bootstrapping and installing GCC,
    646  1.1  mrg one may use GNU Bash instead of AIX <samp><span class="command">/bin/sh</span></samp>, e.g.,
    647  1.1  mrg 
    648  1.1  mrg <pre class="smallexample">        % CONFIG_SHELL=/opt/freeware/bin/bash
    649  1.1  mrg         % export CONFIG_SHELL
    650  1.1  mrg </pre>
    651  1.1  mrg    <p>and then proceed as described in <a href="build.html">the build instructions</a>, where we strongly recommend specifying an absolute path
    652  1.1  mrg to invoke <var>srcdir</var>/configure.
    653  1.1  mrg 
    654  1.1  mrg    <p>Because GCC on AIX is built as a 32-bit executable by default,
    655  1.1  mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    656  1.1  mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    657  1.1  mrg as static archive libraries works better than shared libraries.
    658  1.1  mrg 
    659  1.1  mrg    <p>Errors involving <code>alloca</code> when building GCC generally are due
    660  1.1  mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    661  1.1  mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    662  1.1  mrg the build, the native AIX compiler <strong>must</strong> be invoked as <samp><span class="command">cc</span></samp>
    663  1.1  mrg (not <samp><span class="command">xlc</span></samp>).  Once <samp><span class="command">configure</span></samp> has been informed of
    664  1.1  mrg <samp><span class="command">xlc</span></samp>, one needs to use &lsquo;<samp><span class="samp">make distclean</span></samp>&rsquo; to remove the
    665  1.1  mrg configure cache files and ensure that <samp><span class="env">CC</span></samp> environment variable
    666  1.1  mrg does not provide a definition that will confuse <samp><span class="command">configure</span></samp>. 
    667  1.1  mrg If this error occurs during stage2 or later, then the problem most likely
    668  1.1  mrg is the version of Make (see above).
    669  1.1  mrg 
    670  1.1  mrg    <p>The native <samp><span class="command">as</span></samp> and <samp><span class="command">ld</span></samp> are recommended for bootstrapping
    671  1.1  mrg on AIX.  The GNU Assembler, GNU Linker, and GNU Binutils version 2.20
    672  1.1  mrg is required to bootstrap on AIX 5.  The native AIX tools do
    673  1.1  mrg interoperate with GCC.
    674  1.1  mrg 
    675  1.1  mrg    <p>Building <samp><span class="file">libstdc++.a</span></samp> requires a fix for an AIX Assembler bug
    676  1.1  mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    677  1.1  mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    678  1.1  mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    679  1.1  mrg 
    680  1.1  mrg    <p>&lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; in GCC 3.4 increments the major version number of the
    681  1.1  mrg shared object and GCC installation places the <samp><span class="file">libstdc++.a</span></samp>
    682  1.1  mrg shared library in a common location which will overwrite the and GCC
    683  1.1  mrg 3.3 version of the shared library.  Applications either need to be
    684  1.1  mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    685  1.1  mrg versions of the &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; shared object needs to be available
    686  1.1  mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp><span class="samp">libstdc++.so.4</span></samp>&rsquo;, if
    687  1.1  mrg present, and GCC 3.3 &lsquo;<samp><span class="samp">libstdc++.so.5</span></samp>&rsquo; shared objects can be
    688  1.1  mrg installed for runtime dynamic loading using the following steps to set
    689  1.1  mrg the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag in the shared object for <em>each</em>
    690  1.1  mrg multilib <samp><span class="file">libstdc++.a</span></samp> installed:
    691  1.1  mrg 
    692  1.1  mrg    <p>Extract the shared objects from the currently installed
    693  1.1  mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    694  1.1  mrg <pre class="smallexample">        % ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    695  1.1  mrg </pre>
    696  1.1  mrg    <p>Enable the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag so that the shared object will be
    697  1.1  mrg available for runtime dynamic loading, but not linking:
    698  1.1  mrg <pre class="smallexample">        % strip -e libstdc++.so.4 libstdc++.so.5
    699  1.1  mrg </pre>
    700  1.1  mrg    <p>Archive the runtime-only shared object in the GCC 3.4
    701  1.1  mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    702  1.1  mrg <pre class="smallexample">        % ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    703  1.1  mrg </pre>
    704  1.1  mrg    <p>Linking executables and shared libraries may produce warnings of
    705  1.1  mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    706  1.1  mrg have included multiple symbol definitions for certain global variable
    707  1.1  mrg and function declarations in the original program.  The warnings should
    708  1.1  mrg not prevent the linker from producing a correct library or runnable
    709  1.1  mrg executable.
    710  1.1  mrg 
    711  1.1  mrg    <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    712  1.1  mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    713  1.1  mrg to parse archive libraries did not handle the new format correctly. 
    714  1.1  mrg These routines are used by GCC and result in error messages during
    715  1.1  mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    716  1.1  mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp><span class="option">-g</span></samp>
    717  1.1  mrg option of the archive command may be used to create archives of 32-bit
    718  1.1  mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    719  1.1  mrg routines is shipped with AIX 4.3.2 and above.
    720  1.1  mrg 
    721  1.1  mrg    <p>Some versions of the AIX binder (linker) can fail with a relocation
    722  1.1  mrg overflow severe error when the <samp><span class="option">-bbigtoc</span></samp> option is used to link
    723  1.1  mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    724  1.1  mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    725  1.1  mrg available from IBM Customer Support and from its
    726  1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    727  1.1  mrg website as PTF U455193.
    728  1.1  mrg 
    729  1.1  mrg    <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    730  1.1  mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    731  1.1  mrg APAR IX87327 is available from IBM Customer Support and from its
    732  1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    733  1.1  mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    734  1.1  mrg 
    735  1.1  mrg    <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    736  1.1  mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    737  1.1  mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    738  1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    739  1.1  mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    740  1.1  mrg 
    741  1.1  mrg    <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    742  1.1  mrg use NLS to support locale-specific representations of various data
    743  1.1  mrg formats including floating-point numbers (e.g., &lsquo;<samp><span class="samp">.</span></samp>&rsquo;  vs &lsquo;<samp><span class="samp">,</span></samp>&rsquo; for
    744  1.1  mrg separating decimal fractions).  There have been problems reported where
    745  1.1  mrg GCC does not produce the same floating-point formats that the assembler
    746  1.1  mrg expects.  If one encounters this problem, set the <samp><span class="env">LANG</span></samp>
    747  1.1  mrg environment variable to &lsquo;<samp><span class="samp">C</span></samp>&rsquo; or &lsquo;<samp><span class="samp">En_US</span></samp>&rsquo;.
    748  1.1  mrg 
    749  1.1  mrg    <p>A default can be specified with the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    750  1.1  mrg switch and using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    751  1.1  mrg 
    752  1.1  mrg    <p><hr />
    753  1.1  mrg 
    754  1.1  mrg <h3 class="heading"><a name="TOC21"></a><a name="iq2000_002dx_002delf"></a>iq2000-*-elf</h3>
    755  1.1  mrg 
    756  1.1  mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    757  1.1  mrg applications.  There are no standard Unix configurations.
    758  1.1  mrg 
    759  1.1  mrg    <p><hr />
    760  1.1  mrg 
    761  1.1  mrg <h3 class="heading"><a name="TOC22"></a><a name="lm32_002dx_002delf"></a>lm32-*-elf</h3>
    762  1.1  mrg 
    763  1.1  mrg <p>Lattice Mico32 processor. 
    764  1.1  mrg This configuration is intended for embedded systems.
    765  1.1  mrg 
    766  1.1  mrg    <p><hr />
    767  1.1  mrg 
    768  1.1  mrg <h3 class="heading"><a name="TOC23"></a><a name="lm32_002dx_002duclinux"></a>lm32-*-uclinux</h3>
    769  1.1  mrg 
    770  1.1  mrg <p>Lattice Mico32 processor. 
    771  1.1  mrg This configuration is intended for embedded systems running uClinux.
    772  1.1  mrg 
    773  1.1  mrg    <p><hr />
    774  1.1  mrg 
    775  1.1  mrg <h3 class="heading"><a name="TOC24"></a><a name="m32c_002dx_002delf"></a>m32c-*-elf</h3>
    776  1.1  mrg 
    777  1.1  mrg <p>Renesas M32C processor. 
    778  1.1  mrg This configuration is intended for embedded systems.
    779  1.1  mrg 
    780  1.1  mrg    <p><hr />
    781  1.1  mrg 
    782  1.1  mrg <h3 class="heading"><a name="TOC25"></a><a name="m32r_002dx_002delf"></a>m32r-*-elf</h3>
    783  1.1  mrg 
    784  1.1  mrg <p>Renesas M32R processor. 
    785  1.1  mrg This configuration is intended for embedded systems.
    786  1.1  mrg 
    787  1.1  mrg    <p><hr />
    788  1.1  mrg 
    789  1.1  mrg <h3 class="heading"><a name="TOC26"></a><a name="m6811_002delf"></a>m6811-elf</h3>
    790  1.1  mrg 
    791  1.1  mrg <p>Motorola 68HC11 family micro controllers.  These are used in embedded
    792  1.1  mrg applications.  There are no standard Unix configurations.
    793  1.1  mrg 
    794  1.1  mrg    <p><hr />
    795  1.1  mrg 
    796  1.1  mrg <h3 class="heading"><a name="TOC27"></a><a name="m6812_002delf"></a>m6812-elf</h3>
    797  1.1  mrg 
    798  1.1  mrg <p>Motorola 68HC12 family micro controllers.  These are used in embedded
    799  1.1  mrg applications.  There are no standard Unix configurations.
    800  1.1  mrg 
    801  1.1  mrg    <p><hr />
    802  1.1  mrg 
    803  1.1  mrg <h3 class="heading"><a name="TOC28"></a><a name="m68k_002dx_002dx"></a>m68k-*-*</h3>
    804  1.1  mrg 
    805  1.1  mrg <p>By default,
    806  1.1  mrg &lsquo;<samp><span class="samp">m68k-*-elf*</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68k-*-rtems</span></samp>&rsquo;,  &lsquo;<samp><span class="samp">m68k-*-uclinux</span></samp>&rsquo; and
    807  1.1  mrg &lsquo;<samp><span class="samp">m68k-*-linux</span></samp>&rsquo;
    808  1.1  mrg build libraries for both M680x0 and ColdFire processors.  If you only
    809  1.1  mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    810  1.1  mrg <samp><span class="option">--with-arch=m68k</span></samp> to <samp><span class="command">configure</span></samp>.  Alternatively, you
    811  1.1  mrg can omit the M680x0 libraries by passing <samp><span class="option">--with-arch=cf</span></samp> to
    812  1.1  mrg <samp><span class="command">configure</span></samp>.  These targets default to 5206 or 5475 code as
    813  1.1  mrg appropriate for the target system when
    814  1.1  mrg configured with <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    815  1.1  mrg 
    816  1.1  mrg    <p>The &lsquo;<samp><span class="samp">m68k-*-netbsd</span></samp>&rsquo; and
    817  1.1  mrg &lsquo;<samp><span class="samp">m68k-*-openbsd</span></samp>&rsquo; targets also support the <samp><span class="option">--with-arch</span></samp>
    818  1.1  mrg option.  They will generate ColdFire CFV4e code when configured with
    819  1.1  mrg <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    820  1.1  mrg 
    821  1.1  mrg    <p>You can override the default processors listed above by configuring
    822  1.1  mrg with <samp><span class="option">--with-cpu=</span><var>target</var></samp>.  This <var>target</var> can either
    823  1.1  mrg be a <samp><span class="option">-mcpu</span></samp> argument or one of the following values:
    824  1.1  mrg &lsquo;<samp><span class="samp">m68000</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68010</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68020</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68030</span></samp>&rsquo;,
    825  1.1  mrg &lsquo;<samp><span class="samp">m68040</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68060</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68020-40</span></samp>&rsquo; and &lsquo;<samp><span class="samp">m68020-60</span></samp>&rsquo;.
    826  1.1  mrg 
    827  1.1  mrg    <p><hr />
    828  1.1  mrg 
    829  1.1  mrg <h3 class="heading"><a name="TOC29"></a><a name="m68k_002dx_002duclinux"></a>m68k-*-uclinux</h3>
    830  1.1  mrg 
    831  1.1  mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    832  1.1  mrg &lsquo;<samp><span class="samp">m68k-linux-gnu</span></samp>&rsquo; ABI rather than the &lsquo;<samp><span class="samp">m68k-elf</span></samp>&rsquo; ABI. 
    833  1.1  mrg It also added improved support for C++ and flat shared libraries,
    834  1.1  mrg both of which were ABI changes.  However, you can still use the
    835  1.1  mrg original ABI by configuring for &lsquo;<samp><span class="samp">m68k-uclinuxoldabi</span></samp>&rsquo; or
    836  1.1  mrg &lsquo;<samp><span class="samp">m68k-</span><var>vendor</var><span class="samp">-uclinuxoldabi</span></samp>&rsquo;.
    837  1.1  mrg 
    838  1.1  mrg    <p><hr />
    839  1.1  mrg 
    840  1.1  mrg <h3 class="heading"><a name="TOC30"></a><a name="mep_002dx_002delf"></a>mep-*-elf</h3>
    841  1.1  mrg 
    842  1.1  mrg <p>Toshiba Media embedded Processor. 
    843  1.1  mrg This configuration is intended for embedded systems.
    844  1.1  mrg 
    845  1.1  mrg    <p><hr />
    846  1.1  mrg 
    847  1.1  mrg <h3 class="heading"><a name="TOC31"></a><a name="mips_002dx_002dx"></a>mips-*-*</h3>
    848  1.1  mrg 
    849  1.1  mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    850  1.1  mrg sections for all it's [sic] sectons [sic]&rdquo;, don't worry about it.  This
    851  1.1  mrg happens whenever you use GAS with the MIPS linker, but there is not
    852  1.1  mrg really anything wrong, and it is okay to use the output file.  You can
    853  1.1  mrg stop such warnings by installing the GNU linker.
    854  1.1  mrg 
    855  1.1  mrg    <p>It would be nice to extend GAS to produce the gp tables, but they are
    856  1.1  mrg optional, and there should not be a warning about their absence.
    857  1.1  mrg 
    858  1.1  mrg    <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    859  1.1  mrg and later.  A patch went in just after the GCC 3.3 release to
    860  1.1  mrg make &lsquo;<samp><span class="samp">mips*-*-*</span></samp>&rsquo; use the generic implementation instead.  You can also
    861  1.1  mrg configure for &lsquo;<samp><span class="samp">mipsel-elf</span></samp>&rsquo; as a workaround.  The
    862  1.1  mrg &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; target continues to use the MIPS II routines.  More
    863  1.1  mrg work on this is expected in future releases.
    864  1.1  mrg 
    865  1.1  mrg <!-- If you make -with-llsc the default for another target, please also -->
    866  1.1  mrg <!-- update the description of the -with-llsc option. -->
    867  1.1  mrg    <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    868  1.1  mrg later systems and others that support the &lsquo;<samp><span class="samp">ll</span></samp>&rsquo;, &lsquo;<samp><span class="samp">sc</span></samp>&rsquo; and
    869  1.1  mrg &lsquo;<samp><span class="samp">sync</span></samp>&rsquo; instructions.  This can be overridden by passing
    870  1.1  mrg <samp><span class="option">--with-llsc</span></samp> or <samp><span class="option">--without-llsc</span></samp> when configuring GCC. 
    871  1.1  mrg Since the Linux kernel emulates these instructions if they are
    872  1.1  mrg missing, the default for &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; targets is
    873  1.1  mrg <samp><span class="option">--with-llsc</span></samp>.  The <samp><span class="option">--with-llsc</span></samp> and
    874  1.1  mrg <samp><span class="option">--without-llsc</span></samp> configure options may be overridden at compile
    875  1.1  mrg time by passing the <samp><span class="option">-mllsc</span></samp> or <samp><span class="option">-mno-llsc</span></samp> options to
    876  1.1  mrg the compiler.
    877  1.1  mrg 
    878  1.1  mrg    <p>MIPS systems check for division by zero (unless
    879  1.1  mrg <samp><span class="option">-mno-check-zero-division</span></samp> is passed to the compiler) by
    880  1.1  mrg generating either a conditional trap or a break instruction.  Using
    881  1.1  mrg trap results in smaller code, but is only supported on MIPS II and
    882  1.1  mrg later.  Also, some versions of the Linux kernel have a bug that
    883  1.1  mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    884  1.1  mrg the use of break, use the <samp><span class="option">--with-divide=breaks</span></samp>
    885  1.1  mrg <samp><span class="command">configure</span></samp> option when configuring GCC.  The default is to
    886  1.1  mrg use traps on systems that support them.
    887  1.1  mrg 
    888  1.1  mrg    <p>Cross-compilers for the MIPS as target using the MIPS assembler
    889  1.1  mrg currently do not work, because the auxiliary programs
    890  1.1  mrg <samp><span class="file">mips-tdump.c</span></samp> and <samp><span class="file">mips-tfile.c</span></samp> can't be compiled on
    891  1.1  mrg anything but a MIPS.  It does work to cross compile for a MIPS
    892  1.1  mrg if you use the GNU assembler and linker.
    893  1.1  mrg 
    894  1.1  mrg    <p>The assembler from GNU binutils 2.17 and earlier has a bug in the way
    895  1.1  mrg it sorts relocations for REL targets (o32, o64, EABI).  This can cause
    896  1.1  mrg bad code to be generated for simple C++ programs.  Also the linker
    897  1.1  mrg from GNU binutils versions prior to 2.17 has a bug which causes the
    898  1.1  mrg runtime linker stubs in very large programs, like <samp><span class="file">libgcj.so</span></samp>, to
    899  1.1  mrg be incorrectly generated.  GNU Binutils 2.18 and later (and snapshots
    900  1.1  mrg made after Nov. 9, 2006) should be free from both of these problems.
    901  1.1  mrg 
    902  1.1  mrg    <p><hr />
    903  1.1  mrg 
    904  1.1  mrg <h3 class="heading"><a name="TOC32"></a><a name="mips_002dsgi_002dirix5"></a>mips-sgi-irix5</h3>
    905  1.1  mrg 
    906  1.1  mrg <p>Support for IRIX 5 has been obsoleted in GCC 4.5, but can still be
    907  1.1  mrg enabled by configuring with <samp><span class="option">--enable-obsolete</span></samp>.  Support will be
    908  1.1  mrg removed in GCC 4.6.
    909  1.1  mrg 
    910  1.1  mrg    <p>In order to compile GCC on an SGI running IRIX 5, the &lsquo;<samp><span class="samp">compiler_dev.hdr</span></samp>&rsquo;
    911  1.1  mrg subsystem must be installed from the IDO CD-ROM supplied by SGI. 
    912  1.1  mrg It is also available for download from
    913  1.1  mrg <a href="http://freeware.sgi.com/ido.html">http://freeware.sgi.com/ido.html</a>.
    914  1.1  mrg 
    915  1.1  mrg    <p>If you use the MIPS C compiler to bootstrap, it may be necessary
    916  1.1  mrg to increase its table size for switch statements with the
    917  1.1  mrg <samp><span class="option">-Wf,-XNg1500</span></samp> option.  If you use the <samp><span class="option">-O2</span></samp>
    918  1.1  mrg optimization option, you also need to use <samp><span class="option">-Olimit 3000</span></samp>. 
    919  1.1  mrg <!-- FIXME: verify. -->
    920  1.1  mrg 
    921  1.1  mrg    <p>GCC must be configured to use GNU <samp><span class="command">as</span></samp>.  The latest version, from GNU
    922  1.1  mrg binutils 2.20.1, is known to work.
    923  1.1  mrg 
    924  1.1  mrg    <p>To enable debugging under IRIX 5, you must use GNU binutils 2.15 or
    925  1.1  mrg later, and use the <samp><span class="option">--with-gnu-ld</span></samp> <samp><span class="command">configure</span></samp> option
    926  1.1  mrg when configuring GCC. 
    927  1.1  mrg You need to use GNU <samp><span class="command">ar</span></samp> and <samp><span class="command">nm</span></samp>,
    928  1.1  mrg also distributed with GNU binutils. 
    929  1.1  mrg <!-- FIXME: which parts of this are still true? -->
    930  1.1  mrg 
    931  1.1  mrg    <p>Configuring GCC with <samp><span class="command">/bin/sh</span></samp> is <em>extremely</em> slow and may
    932  1.1  mrg even hang.  This problem can be avoided by running <samp><span class="command">configure</span></samp>
    933  1.1  mrg like this:
    934  1.1  mrg 
    935  1.1  mrg <pre class="smallexample">        % CONFIG_SHELL=/usr/local/bin/bash
    936  1.1  mrg         % export CONFIG_SHELL
    937  1.1  mrg         % $CONFIG_SHELL <var>srcdir</var>/configure [<var>options</var>]
    938  1.1  mrg </pre>
    939  1.1  mrg    <p class="noindent"><samp><span class="command">/bin/ksh</span></samp> doesn't work properly either.
    940  1.1  mrg 
    941  1.1  mrg    <p><hr />
    942  1.1  mrg 
    943  1.1  mrg <h3 class="heading"><a name="TOC33"></a><a name="mips_002dsgi_002dirix6"></a>mips-sgi-irix6</h3>
    944  1.1  mrg 
    945  1.1  mrg <p>Support for IRIX 6 releases before 6.5 has been obsoleted in GCC 4.5,
    946  1.1  mrg but can still be enabled by configuring with <samp><span class="option">--enable-obsolete</span></samp>. 
    947  1.1  mrg Support will be removed in GCC 4.6, which will also disable support for
    948  1.1  mrg the O32 ABI.  It is <em>strongly</em> recommended to upgrade to at least
    949  1.1  mrg IRIX 6.5.18.  This release introduced full ISO C99 support, though for
    950  1.1  mrg the N32 and N64 ABIs only.
    951  1.1  mrg 
    952  1.1  mrg    <p>To build and use GCC on IRIX 6, you need the IRIX Development Foundation
    953  1.1  mrg (IDF) and IRIX Development Libraries (IDL).  They are included with the
    954  1.1  mrg IRIX 6.5 media and can be downloaded from
    955  1.1  mrg <a href="http://freeware.sgi.com/idf_idl.html">http://freeware.sgi.com/idf_idl.html</a> for older IRIX 6 releases.
    956  1.1  mrg 
    957  1.1  mrg    <p>If you are using SGI's MIPSpro <samp><span class="command">cc</span></samp> as your bootstrap compiler, you must
    958  1.1  mrg ensure that the N32 ABI is in use.  To test this, compile a simple C
    959  1.1  mrg file with <samp><span class="command">cc</span></samp> and then run <samp><span class="command">file</span></samp> on the
    960  1.1  mrg resulting object file.  The output should look like:
    961  1.1  mrg 
    962  1.1  mrg <pre class="smallexample">     test.o: ELF N32 MSB ...
    963  1.1  mrg </pre>
    964  1.1  mrg    <p class="noindent">If you see:
    965  1.1  mrg 
    966  1.1  mrg <pre class="smallexample">     test.o: ELF 32-bit MSB ...
    967  1.1  mrg </pre>
    968  1.1  mrg    <p class="noindent">or
    969  1.1  mrg 
    970  1.1  mrg <pre class="smallexample">     test.o: ELF 64-bit MSB ...
    971  1.1  mrg </pre>
    972  1.1  mrg    <p class="noindent">then your version of <samp><span class="command">cc</span></samp> uses the O32 or N64 ABI by default.  You
    973  1.1  mrg should set the environment variable <samp><span class="env">CC</span></samp> to &lsquo;<samp><span class="samp">cc -n32</span></samp>&rsquo;
    974  1.1  mrg before configuring GCC.
    975  1.1  mrg 
    976  1.1  mrg    <p>If you want the resulting <samp><span class="command">gcc</span></samp> to run on old 32-bit systems
    977  1.1  mrg with the MIPS R4400 CPU, you need to ensure that only code for the &lsquo;<samp><span class="samp">mips3</span></samp>&rsquo;
    978  1.1  mrg instruction set architecture (ISA) is generated.  While GCC 3.x does
    979  1.1  mrg this correctly, both GCC 2.95 and SGI's MIPSpro <samp><span class="command">cc</span></samp> may change
    980  1.1  mrg the ISA depending on the machine where GCC is built.  Using one of them
    981  1.1  mrg as the bootstrap compiler may result in &lsquo;<samp><span class="samp">mips4</span></samp>&rsquo; code, which won't run at
    982  1.1  mrg all on &lsquo;<samp><span class="samp">mips3</span></samp>&rsquo;-only systems.  For the test program above, you should see:
    983  1.1  mrg 
    984  1.1  mrg <pre class="smallexample">     test.o: ELF N32 MSB mips-3 ...
    985  1.1  mrg </pre>
    986  1.1  mrg    <p class="noindent">If you get:
    987  1.1  mrg 
    988  1.1  mrg <pre class="smallexample">     test.o: ELF N32 MSB mips-4 ...
    989  1.1  mrg </pre>
    990  1.1  mrg    <p class="noindent">instead, you should set the environment variable <samp><span class="env">CC</span></samp> to &lsquo;<samp><span class="samp">cc
    991  1.1  mrg -n32 -mips3</span></samp>&rsquo; or &lsquo;<samp><span class="samp">gcc -mips3</span></samp>&rsquo; respectively before configuring GCC.
    992  1.1  mrg 
    993  1.1  mrg    <p>MIPSpro C 7.4 may cause bootstrap failures, due to a bug when inlining
    994  1.1  mrg <code>memcmp</code>.  Either add <code>-U__INLINE_INTRINSICS</code> to the <samp><span class="env">CC</span></samp>
    995  1.1  mrg environment variable as a workaround or upgrade to MIPSpro C 7.4.1m.
    996  1.1  mrg 
    997  1.1  mrg    <p>GCC on IRIX 6 is usually built to support the N32, O32 and N64 ABIs.  If
    998  1.1  mrg you build GCC on a system that doesn't have the N64 libraries installed
    999  1.1  mrg or cannot run 64-bit binaries,
   1000  1.1  mrg you need to configure with <samp><span class="option">--disable-multilib</span></samp> so GCC doesn't
   1001  1.1  mrg try to use them.  This will disable building the O32 libraries, too. 
   1002  1.1  mrg Look for <samp><span class="file">/usr/lib64/libc.so.1</span></samp> to see if you
   1003  1.1  mrg have the 64-bit libraries installed.
   1004  1.1  mrg 
   1005  1.1  mrg    <p>GCC must be configured with GNU <samp><span class="command">as</span></samp>.  The latest version, from GNU
   1006  1.1  mrg binutils 2.20.1, is known to work.  On the other hand, bootstrap fails
   1007  1.1  mrg with GNU <samp><span class="command">ld</span></samp> at least since GNU binutils 2.17.
   1008  1.1  mrg 
   1009  1.1  mrg    <p>The <samp><span class="option">--enable-libgcj</span></samp>
   1010  1.1  mrg option is disabled by default: IRIX 6 uses a very low default limit
   1011  1.1  mrg (20480) for the command line length.  Although <samp><span class="command">libtool</span></samp> contains a
   1012  1.1  mrg workaround for this problem, at least the N64 &lsquo;<samp><span class="samp">libgcj</span></samp>&rsquo; is known not
   1013  1.1  mrg to build despite this, running into an internal error of the native
   1014  1.1  mrg <samp><span class="command">ld</span></samp>.  A sure fix is to increase this limit (&lsquo;<samp><span class="samp">ncargs</span></samp>&rsquo;) to
   1015  1.1  mrg its maximum of 262144 bytes.  If you have root access, you can use the
   1016  1.1  mrg <samp><span class="command">systune</span></samp> command to do this. 
   1017  1.1  mrg <!-- FIXME: does this work with current libtool? -->
   1018  1.1  mrg 
   1019  1.1  mrg    <p><code>wchar_t</code> support in &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; is not available for old
   1020  1.1  mrg IRIX 6.5.x releases, x &lt; 19.  The problem cannot be autodetected
   1021  1.1  mrg and in order to build GCC for such targets you need to configure with
   1022  1.1  mrg <samp><span class="option">--disable-wchar_t</span></samp>.
   1023  1.1  mrg 
   1024  1.1  mrg    <p><hr />
   1025  1.1  mrg 
   1026  1.1  mrg <h3 class="heading"><a name="TOC34"></a><a name="moxie_002dx_002delf"></a>moxie-*-elf</h3>
   1027  1.1  mrg 
   1028  1.1  mrg <p>The moxie processor.  See <a href="http://moxielogic.org/">http://moxielogic.org/</a> for more
   1029  1.1  mrg information about this processor.
   1030  1.1  mrg 
   1031  1.1  mrg    <p><hr />
   1032  1.1  mrg 
   1033  1.1  mrg <h3 class="heading"><a name="TOC35"></a><a name="powerpc_002dx_002dx"></a>powerpc-*-*</h3>
   1034  1.1  mrg 
   1035  1.1  mrg <p>You can specify a default version for the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
   1036  1.1  mrg switch by using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
   1037  1.1  mrg 
   1038  1.1  mrg    <p>You will need
   1039  1.1  mrg <a href="ftp://ftp.kernel.org/pub/linux/devel/binutils">binutils 2.15</a>
   1040  1.1  mrg or newer for a working GCC.
   1041  1.1  mrg 
   1042  1.1  mrg    <p><hr />
   1043  1.1  mrg 
   1044  1.1  mrg <h3 class="heading"><a name="TOC36"></a><a name="powerpc_002dx_002ddarwin"></a>powerpc-*-darwin*</h3>
   1045  1.1  mrg 
   1046  1.1  mrg <p>PowerPC running Darwin (Mac OS X kernel).
   1047  1.1  mrg 
   1048  1.1  mrg    <p>Pre-installed versions of Mac OS X may not include any developer tools,
   1049  1.1  mrg meaning that you will not be able to build GCC from source.  Tool
   1050  1.1  mrg binaries are available at
   1051  1.1  mrg <a href="http://developer.apple.com/darwin/projects/compiler/">http://developer.apple.com/darwin/projects/compiler/</a> (free
   1052  1.1  mrg registration required).
   1053  1.1  mrg 
   1054  1.1  mrg    <p>This version of GCC requires at least cctools-590.36.  The
   1055  1.1  mrg cctools-590.36 package referenced from
   1056  1.1  mrg <a href="http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html">http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html</a> will not work
   1057  1.1  mrg on systems older than 10.3.9 (aka darwin7.9.0).
   1058  1.1  mrg 
   1059  1.1  mrg    <p><hr />
   1060  1.1  mrg 
   1061  1.1  mrg <h3 class="heading"><a name="TOC37"></a><a name="powerpc_002dx_002delf"></a>powerpc-*-elf</h3>
   1062  1.1  mrg 
   1063  1.1  mrg <p>PowerPC system in big endian mode, running System V.4.
   1064  1.1  mrg 
   1065  1.1  mrg    <p><hr />
   1066  1.1  mrg 
   1067  1.1  mrg <h3 class="heading"><a name="TOC38"></a><a name="powerpc_002dx_002dlinux_002dgnu"></a>powerpc*-*-linux-gnu*</h3>
   1068  1.1  mrg 
   1069  1.1  mrg <p>PowerPC system in big endian mode running Linux.
   1070  1.1  mrg 
   1071  1.1  mrg    <p><hr />
   1072  1.1  mrg 
   1073  1.1  mrg <h3 class="heading"><a name="TOC39"></a><a name="powerpc_002dx_002dnetbsd"></a>powerpc-*-netbsd*</h3>
   1074  1.1  mrg 
   1075  1.1  mrg <p>PowerPC system in big endian mode running NetBSD.
   1076  1.1  mrg 
   1077  1.1  mrg    <p><hr />
   1078  1.1  mrg 
   1079  1.1  mrg <h3 class="heading"><a name="TOC40"></a><a name="powerpc_002dx_002deabisim"></a>powerpc-*-eabisim</h3>
   1080  1.1  mrg 
   1081  1.1  mrg <p>Embedded PowerPC system in big endian mode for use in running under the
   1082  1.1  mrg PSIM simulator.
   1083  1.1  mrg 
   1084  1.1  mrg    <p><hr />
   1085  1.1  mrg 
   1086  1.1  mrg <h3 class="heading"><a name="TOC41"></a><a name="powerpc_002dx_002deabi"></a>powerpc-*-eabi</h3>
   1087  1.1  mrg 
   1088  1.1  mrg <p>Embedded PowerPC system in big endian mode.
   1089  1.1  mrg 
   1090  1.1  mrg    <p><hr />
   1091  1.1  mrg 
   1092  1.1  mrg <h3 class="heading"><a name="TOC42"></a><a name="powerpcle_002dx_002delf"></a>powerpcle-*-elf</h3>
   1093  1.1  mrg 
   1094  1.1  mrg <p>PowerPC system in little endian mode, running System V.4.
   1095  1.1  mrg 
   1096  1.1  mrg    <p><hr />
   1097  1.1  mrg 
   1098  1.1  mrg <h3 class="heading"><a name="TOC43"></a><a name="powerpcle_002dx_002deabisim"></a>powerpcle-*-eabisim</h3>
   1099  1.1  mrg 
   1100  1.1  mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1101  1.1  mrg the PSIM simulator.
   1102  1.1  mrg 
   1103  1.1  mrg    <p><hr />
   1104  1.1  mrg 
   1105  1.1  mrg <h3 class="heading"><a name="TOC44"></a><a name="powerpcle_002dx_002deabi"></a>powerpcle-*-eabi</h3>
   1106  1.1  mrg 
   1107  1.1  mrg <p>Embedded PowerPC system in little endian mode.
   1108  1.1  mrg 
   1109  1.1  mrg    <p><hr />
   1110  1.1  mrg 
   1111  1.1  mrg <h3 class="heading"><a name="TOC45"></a><a name="rx_002dx_002delf"></a>rx-*-elf</h3>
   1112  1.1  mrg 
   1113  1.1  mrg <p>The Renesas RX processor.  See
   1114  1.1  mrg <a href="http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series">http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series</a>
   1115  1.1  mrg for more information about this processor.
   1116  1.1  mrg 
   1117  1.1  mrg    <p><hr />
   1118  1.1  mrg 
   1119  1.1  mrg <h3 class="heading"><a name="TOC46"></a><a name="s390_002dx_002dlinux"></a>s390-*-linux*</h3>
   1120  1.1  mrg 
   1121  1.1  mrg <p>S/390 system running GNU/Linux for S/390.
   1122  1.1  mrg 
   1123  1.1  mrg    <p><hr />
   1124  1.1  mrg 
   1125  1.1  mrg <h3 class="heading"><a name="TOC47"></a><a name="s390x_002dx_002dlinux"></a>s390x-*-linux*</h3>
   1126  1.1  mrg 
   1127  1.1  mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1128  1.1  mrg 
   1129  1.1  mrg    <p><hr />
   1130  1.1  mrg 
   1131  1.1  mrg <h3 class="heading"><a name="TOC48"></a><a name="s390x_002dibm_002dtpf"></a>s390x-ibm-tpf*</h3>
   1132  1.1  mrg 
   1133  1.1  mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1134  1.1  mrg supported as cross-compilation target only.
   1135  1.1  mrg 
   1136  1.1  mrg    <p><hr /><!-- Please use Solaris 2 to refer to all release of Solaris, starting -->
   1137  1.1  mrg <!-- with 2.0 until 2.6, 7, 8, etc.  Solaris 1 was a marketing name for -->
   1138  1.1  mrg <!-- SunOS 4 releases which we don't use to avoid confusion.  Solaris -->
   1139  1.1  mrg <!-- alone is too unspecific and must be avoided. -->
   1140  1.1  mrg 
   1141  1.1  mrg <h3 class="heading"><a name="TOC49"></a><a name="x_002dx_002dsolaris2"></a>*-*-solaris2*</h3>
   1142  1.1  mrg 
   1143  1.1  mrg <p>Support for Solaris 7 has been obsoleted in GCC 4.5, but can still be
   1144  1.1  mrg enabled by configuring with <samp><span class="option">--enable-obsolete</span></samp>.  Support will be
   1145  1.1  mrg removed in GCC 4.6.
   1146  1.1  mrg 
   1147  1.1  mrg    <p>Sun does not ship a C compiler with Solaris 2, though you can download
   1148  1.1  mrg the Sun Studio compilers for free from
   1149  1.1  mrg <a href="http://developers.sun.com/sunstudio/downloads/">http://developers.sun.com/sunstudio/downloads/</a>.  Alternatively,
   1150  1.1  mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1151  1.1  mrg <a href="binaries.html">binaries page</a> for details.
   1152  1.1  mrg 
   1153  1.1  mrg    <p>The Solaris 2 <samp><span class="command">/bin/sh</span></samp> will often fail to configure
   1154  1.1  mrg &lsquo;<samp><span class="samp">libstdc++-v3</span></samp>&rsquo;, &lsquo;<samp><span class="samp">boehm-gc</span></samp>&rsquo; or &lsquo;<samp><span class="samp">libjava</span></samp>&rsquo;.  We therefore
   1155  1.1  mrg recommend using the following initial sequence of commands
   1156  1.1  mrg 
   1157  1.1  mrg <pre class="smallexample">        % CONFIG_SHELL=/bin/ksh
   1158  1.1  mrg         % export CONFIG_SHELL
   1159  1.1  mrg </pre>
   1160  1.1  mrg    <p class="noindent">and proceed as described in <a href="configure.html">the configure instructions</a>. 
   1161  1.1  mrg In addition we strongly recommend specifying an absolute path to invoke
   1162  1.1  mrg <samp><var>srcdir</var><span class="command">/configure</span></samp>.
   1163  1.1  mrg 
   1164  1.1  mrg    <p>Solaris 2 comes with a number of optional OS packages.  Some of these
   1165  1.1  mrg are needed to use GCC fully, namely <code>SUNWarc</code>,
   1166  1.1  mrg <code>SUNWbtool</code>, <code>SUNWesu</code>, <code>SUNWhea</code>, <code>SUNWlibm</code>,
   1167  1.1  mrg <code>SUNWsprot</code>, and <code>SUNWtoo</code>.  If you did not install all
   1168  1.1  mrg optional packages when installing Solaris 2, you will need to verify that
   1169  1.1  mrg the packages that GCC needs are installed.
   1170  1.1  mrg 
   1171  1.1  mrg    <p>To check whether an optional package is installed, use
   1172  1.1  mrg the <samp><span class="command">pkginfo</span></samp> command.  To add an optional package, use the
   1173  1.1  mrg <samp><span class="command">pkgadd</span></samp> command.  For further details, see the Solaris 2
   1174  1.1  mrg documentation.
   1175  1.1  mrg 
   1176  1.1  mrg    <p>Trying to use the linker and other tools in
   1177  1.1  mrg <samp><span class="file">/usr/ucb</span></samp> to install GCC has been observed to cause trouble. 
   1178  1.1  mrg For example, the linker may hang indefinitely.  The fix is to remove
   1179  1.1  mrg <samp><span class="file">/usr/ucb</span></samp> from your <samp><span class="env">PATH</span></samp>.
   1180  1.1  mrg 
   1181  1.1  mrg    <p>The build process works more smoothly with the legacy Sun tools so, if you
   1182  1.1  mrg have <samp><span class="file">/usr/xpg4/bin</span></samp> in your <samp><span class="env">PATH</span></samp>, we recommend that you place
   1183  1.1  mrg <samp><span class="file">/usr/bin</span></samp> before <samp><span class="file">/usr/xpg4/bin</span></samp> for the duration of the build.
   1184  1.1  mrg 
   1185  1.1  mrg    <p>We recommend the use of the Sun assembler or the GNU assembler, in
   1186  1.1  mrg conjunction with the Sun linker.  The GNU <samp><span class="command">as</span></samp>
   1187  1.1  mrg versions included in Solaris 10, from GNU binutils 2.15, and Solaris 11,
   1188  1.1  mrg from GNU binutils 2.19, are known to work.  They can be found in
   1189  1.1  mrg <samp><span class="file">/usr/sfw/bin/gas</span></samp>.  Current versions of GNU binutils (2.20.1)
   1190  1.1  mrg are known to work as well.  Note that your mileage may vary
   1191  1.1  mrg if you use a combination of the GNU tools and the Sun tools: while the
   1192  1.1  mrg combination GNU <samp><span class="command">as</span></samp> + Sun <samp><span class="command">ld</span></samp> should reasonably work,
   1193  1.1  mrg the reverse combination Sun <samp><span class="command">as</span></samp> + GNU <samp><span class="command">ld</span></samp> is known to
   1194  1.1  mrg cause memory corruption at runtime in some cases for C++ programs. 
   1195  1.1  mrg <!-- FIXME: still? -->
   1196  1.1  mrg GNU <samp><span class="command">ld</span></samp> usually works as well, although the version included in
   1197  1.1  mrg Solaris 10 cannot be used due to several bugs.  Again, the current
   1198  1.1  mrg version (2.20.1) is known to work, but generally lacks platform specific
   1199  1.1  mrg features, so better stay with Sun <samp><span class="command">ld</span></samp>.
   1200  1.1  mrg 
   1201  1.1  mrg    <p>Sun bug 4296832 turns up when compiling X11 headers with GCC 2.95 or
   1202  1.1  mrg newer: <samp><span class="command">g++</span></samp> will complain that types are missing.  These headers
   1203  1.1  mrg assume that omitting the type means <code>int</code>; this assumption worked for
   1204  1.1  mrg C90 but is wrong for C++, and is now wrong for C99 also.
   1205  1.1  mrg 
   1206  1.1  mrg    <p><samp><span class="command">g++</span></samp> accepts such (invalid) constructs with the option
   1207  1.1  mrg <samp><span class="option">-fpermissive</span></samp>; it will assume that any missing type is <code>int</code>
   1208  1.1  mrg (as defined by C90).
   1209  1.1  mrg 
   1210  1.1  mrg    <p>There are patches for Solaris 7 (108376-21 or newer for SPARC,
   1211  1.1  mrg 108377-20 for Intel), and Solaris 8 (108652-24 or newer for SPARC,
   1212  1.1  mrg 108653-22 for Intel) that fix this bug.
   1213  1.1  mrg 
   1214  1.1  mrg    <p>Sun bug 4927647 sometimes causes random spurious testsuite failures
   1215  1.1  mrg related to missing diagnostic output.  This bug doesn't affect GCC
   1216  1.1  mrg itself, rather it is a kernel bug triggered by the <samp><span class="command">expect</span></samp>
   1217  1.1  mrg program which is used only by the GCC testsuite driver.  When the bug
   1218  1.1  mrg causes the <samp><span class="command">expect</span></samp> program to miss anticipated output, extra
   1219  1.1  mrg testsuite failures appear.
   1220  1.1  mrg 
   1221  1.1  mrg    <p>There are patches for Solaris 8 (117350-12 or newer for SPARC,
   1222  1.1  mrg 117351-12 or newer for Intel) and Solaris 9 (117171-11 or newer for
   1223  1.1  mrg SPARC, 117172-11 or newer for Intel) that address this problem.
   1224  1.1  mrg 
   1225  1.1  mrg    <p><hr />
   1226  1.1  mrg 
   1227  1.1  mrg <h3 class="heading"><a name="TOC50"></a><a name="sparc_002dsun_002dsolaris2"></a>sparc-sun-solaris2*</h3>
   1228  1.1  mrg 
   1229  1.1  mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1230  1.1  mrg produced are smaller than the ones produced using Sun's native tools;
   1231  1.1  mrg this difference is quite significant for binaries containing debugging
   1232  1.1  mrg information.
   1233  1.1  mrg 
   1234  1.1  mrg    <p>Starting with Solaris 7, the operating system is capable of executing
   1235  1.1  mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1236  1.1  mrg this; the <samp><span class="option">-m64</span></samp> option enables 64-bit code generation. 
   1237  1.1  mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1238  1.1  mrg should try the <samp><span class="option">-mtune=ultrasparc</span></samp> option instead, which produces
   1239  1.1  mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1240  1.1  mrg machines.
   1241  1.1  mrg 
   1242  1.1  mrg    <p>When configuring on a Solaris 7 or later system that is running a kernel
   1243  1.1  mrg that supports only 32-bit binaries, one must configure with
   1244  1.1  mrg <samp><span class="option">--disable-multilib</span></samp>, since we will not be able to build the
   1245  1.1  mrg 64-bit target libraries.
   1246  1.1  mrg 
   1247  1.1  mrg    <p>GCC 3.3 and GCC 3.4 trigger code generation bugs in earlier versions of
   1248  1.1  mrg the GNU compiler (especially GCC 3.0.x versions), which lead to the
   1249  1.1  mrg miscompilation of the stage1 compiler and the subsequent failure of the
   1250  1.1  mrg bootstrap process.  A workaround is to use GCC 3.2.3 as an intermediary
   1251  1.1  mrg stage, i.e. to bootstrap that compiler with the base compiler and then
   1252  1.1  mrg use it to bootstrap the final compiler.
   1253  1.1  mrg 
   1254  1.1  mrg    <p>GCC 3.4 triggers a code generation bug in versions 5.4 (Sun ONE Studio 7)
   1255  1.1  mrg and 5.5 (Sun ONE Studio 8) of the Sun compiler, which causes a bootstrap
   1256  1.1  mrg failure in form of a miscompilation of the stage1 compiler by the Sun
   1257  1.1  mrg compiler.  This is Sun bug 4974440.  This is fixed with patch 112760-07.
   1258  1.1  mrg 
   1259  1.1  mrg    <p>GCC 3.4 changed the default debugging format from Stabs to DWARF-2 for
   1260  1.1  mrg 32-bit code on Solaris 7 and later.  If you use the Sun assembler, this
   1261  1.1  mrg change apparently runs afoul of Sun bug 4910101 (which is referenced as
   1262  1.1  mrg an x86-only problem by Sun, probably because they do not use DWARF-2). 
   1263  1.1  mrg A symptom of the problem is that you cannot compile C++ programs like
   1264  1.1  mrg <samp><span class="command">groff</span></samp> 1.19.1 without getting messages similar to the following:
   1265  1.1  mrg 
   1266  1.1  mrg <pre class="smallexample">     ld: warning: relocation error: R_SPARC_UA32: ...
   1267  1.1  mrg        external symbolic relocation against non-allocatable section
   1268  1.1  mrg        .debug_info cannot be processed at runtime: relocation ignored.
   1269  1.1  mrg </pre>
   1270  1.1  mrg    <p class="noindent">To work around this problem, compile with <samp><span class="option">-gstabs+</span></samp> instead of
   1271  1.1  mrg plain <samp><span class="option">-g</span></samp>.
   1272  1.1  mrg 
   1273  1.1  mrg    <p>When configuring the GNU Multiple Precision Library (GMP) or the MPFR
   1274  1.1  mrg library on a Solaris 7 or later system, the canonical target triplet
   1275  1.1  mrg must be specified as the <samp><span class="command">build</span></samp> parameter on the configure
   1276  1.1  mrg line.  This triplet can be obtained by invoking <samp><span class="command">./config.guess</span></samp> in
   1277  1.1  mrg the toplevel source directory of GCC (and not that of GMP or MPFR). 
   1278  1.1  mrg For example on a Solaris 7 system:
   1279  1.1  mrg 
   1280  1.1  mrg <pre class="smallexample">        % ./configure --build=sparc-sun-solaris2.7 --prefix=xxx
   1281  1.1  mrg </pre>
   1282  1.1  mrg    <p><hr />
   1283  1.1  mrg 
   1284  1.1  mrg <h3 class="heading"><a name="TOC51"></a><a name="sparc_002dsun_002dsolaris27"></a>sparc-sun-solaris2.7</h3>
   1285  1.1  mrg 
   1286  1.1  mrg <p><em>Note</em> that this configuration has been obsoleted in GCC 4.5, and will be
   1287  1.1  mrg removed in GCC 4.6.
   1288  1.1  mrg 
   1289  1.1  mrg    <p>Sun patch 107058-01 (1999-01-13) for Solaris 7/SPARC triggers a bug in
   1290  1.1  mrg the dynamic linker.  This problem (Sun bug 4210064) affects GCC 2.8
   1291  1.1  mrg and later, including all EGCS releases.  Sun formerly recommended
   1292  1.1  mrg 107058-01 for all Solaris 7 users, but around 1999-09-01 it started to
   1293  1.1  mrg recommend it only for people who use Sun's compilers.
   1294  1.1  mrg 
   1295  1.1  mrg    <p>Here are some workarounds to this problem:
   1296  1.1  mrg      <ul>
   1297  1.1  mrg <li>Do not install Sun patch 107058-01 until after Sun releases a
   1298  1.1  mrg complete patch for bug 4210064.  This is the simplest course to take,
   1299  1.1  mrg unless you must also use Sun's C compiler.  Unfortunately 107058-01
   1300  1.1  mrg is preinstalled on some new Solaris 7-based hosts, so you may have to
   1301  1.1  mrg back it out.
   1302  1.1  mrg 
   1303  1.1  mrg      <li>Copy the original, unpatched Solaris 7
   1304  1.1  mrg <samp><span class="command">/usr/ccs/bin/as</span></samp> into
   1305  1.1  mrg <samp><span class="command">/usr/local/libexec/gcc/sparc-sun-solaris2.7/3.4/as</span></samp>,
   1306  1.1  mrg adjusting the latter name to fit your local conventions and software
   1307  1.1  mrg version numbers.
   1308  1.1  mrg 
   1309  1.1  mrg      <li>Install Sun patch 106950-03 (1999-05-25) or later.  Nobody with
   1310  1.1  mrg both 107058-01 and 106950-03 installed has reported the bug with GCC
   1311  1.1  mrg and Sun's dynamic linker.  This last course of action is riskiest,
   1312  1.1  mrg for two reasons.  First, you must install 106950 on all hosts that
   1313  1.1  mrg run code generated by GCC; it doesn't suffice to install it only on
   1314  1.1  mrg the hosts that run GCC itself.  Second, Sun says that 106950-03 is
   1315  1.1  mrg only a partial fix for bug 4210064, but Sun doesn't know whether the
   1316  1.1  mrg partial fix is adequate for GCC.  Revision -08 or later should fix
   1317  1.1  mrg the bug.  The current (as of 2004-05-23) revision is -24, and is included in
   1318  1.1  mrg the Solaris 7 Recommended Patch Cluster. 
   1319  1.1  mrg </ul>
   1320  1.1  mrg 
   1321  1.1  mrg    <p>GCC 3.3 triggers a bug in version 5.0 Alpha 03/27/98 of the Sun assembler,
   1322  1.1  mrg which causes a bootstrap failure when linking the 64-bit shared version of
   1323  1.1  mrg &lsquo;<samp><span class="samp">libgcc</span></samp>&rsquo;.  A typical error message is:
   1324  1.1  mrg 
   1325  1.1  mrg <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_32: file libgcc/sparcv9/_muldi3.o:
   1326  1.1  mrg        symbol &lt;unknown&gt;:  offset 0xffffffff7ec133e7 is non-aligned.
   1327  1.1  mrg </pre>
   1328  1.1  mrg    <p class="noindent">This bug has been fixed in the final 5.0 version of the assembler.
   1329  1.1  mrg 
   1330  1.1  mrg    <p>A similar problem was reported for version Sun WorkShop 6 99/08/18 of the
   1331  1.1  mrg Sun assembler, which causes a bootstrap failure with GCC 4.0.0:
   1332  1.1  mrg 
   1333  1.1  mrg <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_DISP32:
   1334  1.1  mrg        file .libs/libstdc++.lax/libsupc++convenience.a/vterminate.o:
   1335  1.1  mrg          symbol &lt;unknown&gt;: offset 0xfccd33ad is non-aligned
   1336  1.1  mrg </pre>
   1337  1.1  mrg    <p class="noindent">This bug has been fixed in more recent revisions of the assembler.
   1338  1.1  mrg 
   1339  1.1  mrg    <p><hr />
   1340  1.1  mrg 
   1341  1.1  mrg <h3 class="heading"><a name="TOC52"></a><a name="sparc_002dsun_002dsolaris210"></a>sparc-sun-solaris2.10</h3>
   1342  1.1  mrg 
   1343  1.1  mrg <p>There is a bug in older versions of the Sun assembler which breaks
   1344  1.1  mrg thread-local storage (TLS).  A typical error message is
   1345  1.1  mrg 
   1346  1.1  mrg <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_TLS_LE_HIX22: file /var/tmp//ccamPA1v.o:
   1347  1.1  mrg        symbol &lt;unknown&gt;: bad symbol type SECT: symbol type must be TLS
   1348  1.1  mrg </pre>
   1349  1.1  mrg    <p class="noindent">This bug is fixed in Sun patch 118683-03 or later.
   1350  1.1  mrg 
   1351  1.1  mrg    <p><hr />
   1352  1.1  mrg 
   1353  1.1  mrg <h3 class="heading"><a name="TOC53"></a><a name="sparc_002dx_002dlinux"></a>sparc-*-linux*</h3>
   1354  1.1  mrg 
   1355  1.1  mrg <p>GCC versions 3.0 and higher require binutils 2.11.2 and glibc 2.2.4
   1356  1.1  mrg or newer on this platform.  All earlier binutils and glibc
   1357  1.1  mrg releases mishandled unaligned relocations on <code>sparc-*-*</code> targets.
   1358  1.1  mrg 
   1359  1.1  mrg    <p><hr />
   1360  1.1  mrg 
   1361  1.1  mrg <h3 class="heading"><a name="TOC54"></a><a name="sparc64_002dx_002dsolaris2"></a>sparc64-*-solaris2*</h3>
   1362  1.1  mrg 
   1363  1.1  mrg <p>When configuring the GNU Multiple Precision Library (GMP) or the
   1364  1.1  mrg MPFR library, the canonical target triplet must be specified as
   1365  1.1  mrg the <samp><span class="command">build</span></samp> parameter on the configure line.  For example
   1366  1.1  mrg on a Solaris 7 system:
   1367  1.1  mrg 
   1368  1.1  mrg <pre class="smallexample">        % ./configure --build=sparc64-sun-solaris2.7 --prefix=xxx
   1369  1.1  mrg </pre>
   1370  1.1  mrg    <p>The following compiler flags must be specified in the configure
   1371  1.1  mrg step in order to bootstrap this target with the Sun compiler:
   1372  1.1  mrg 
   1373  1.1  mrg <pre class="smallexample">        % CC="cc -xarch=v9 -xildoff" <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>]
   1374  1.1  mrg </pre>
   1375  1.1  mrg    <p class="noindent"><samp><span class="option">-xarch=v9</span></samp> specifies the SPARC-V9 architecture to the Sun toolchain
   1376  1.1  mrg and <samp><span class="option">-xildoff</span></samp> turns off the incremental linker.
   1377  1.1  mrg 
   1378  1.1  mrg    <p><hr />
   1379  1.1  mrg 
   1380  1.1  mrg <h3 class="heading"><a name="TOC55"></a><a name="sparcv9_002dx_002dsolaris2"></a>sparcv9-*-solaris2*</h3>
   1381  1.1  mrg 
   1382  1.1  mrg <p>This is a synonym for &lsquo;<samp><span class="samp">sparc64-*-solaris2*</span></samp>&rsquo;.
   1383  1.1  mrg 
   1384  1.1  mrg    <p><hr />
   1385  1.1  mrg 
   1386  1.1  mrg <h3 class="heading"><a name="TOC56"></a><a name="x_002dx_002dvxworks"></a>*-*-vxworks*</h3>
   1387  1.1  mrg 
   1388  1.1  mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1389  1.1  mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC. 
   1390  1.1  mrg We welcome patches for other architectures supported by VxWorks 5.5. 
   1391  1.1  mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1392  1.1  mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1393  1.1  mrg not interested in supporting older, a.out or COFF-based, versions of
   1394  1.1  mrg VxWorks in GCC 3.
   1395  1.1  mrg 
   1396  1.1  mrg    <p>VxWorks comes with an older version of GCC installed in
   1397  1.1  mrg <samp><var>$WIND_BASE</var><span class="file">/host</span></samp>; we recommend you do not overwrite it. 
   1398  1.1  mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>. 
   1399  1.1  mrg Before running <samp><span class="command">configure</span></samp>, create the directories <samp><var>prefix</var></samp>
   1400  1.1  mrg and <samp><var>prefix</var><span class="file">/bin</span></samp>.  Link or copy the appropriate assembler,
   1401  1.1  mrg linker, etc. into <samp><var>prefix</var><span class="file">/bin</span></samp>, and set your <var>PATH</var> to
   1402  1.1  mrg include that directory while running both <samp><span class="command">configure</span></samp> and
   1403  1.1  mrg <samp><span class="command">make</span></samp>.
   1404  1.1  mrg 
   1405  1.1  mrg    <p>You must give <samp><span class="command">configure</span></samp> the
   1406  1.1  mrg <samp><span class="option">--with-headers=</span><var>$WIND_BASE</var><span class="option">/target/h</span></samp> switch so that it can
   1407  1.1  mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1408  1.1  mrg target only, you must also specify <samp><span class="option">--target=</span><var>target</var></samp>. 
   1409  1.1  mrg <samp><span class="command">configure</span></samp> will attempt to create the directory
   1410  1.1  mrg <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> and copy files into it;
   1411  1.1  mrg make sure the user running <samp><span class="command">configure</span></samp> has sufficient privilege
   1412  1.1  mrg to do so.
   1413  1.1  mrg 
   1414  1.1  mrg    <p>GCC's exception handling runtime requires a special &ldquo;configlette&rdquo;
   1415  1.1  mrg module, <samp><span class="file">contrib/gthr_supp_vxw_5x.c</span></samp>.  Follow the instructions in
   1416  1.1  mrg that file to add the module to your kernel build.  (Future versions of
   1417  1.1  mrg VxWorks will incorporate this module.)
   1418  1.1  mrg 
   1419  1.1  mrg    <p><hr />
   1420  1.1  mrg 
   1421  1.1  mrg <h3 class="heading"><a name="TOC57"></a><a name="x86_002d64_002dx_002dx"></a>x86_64-*-*, amd64-*-*</h3>
   1422  1.1  mrg 
   1423  1.1  mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1424  1.1  mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD. 
   1425  1.1  mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1426  1.1  mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp><span class="option">-m32</span></samp> switch).
   1427  1.1  mrg 
   1428  1.1  mrg    <p><hr />
   1429  1.1  mrg 
   1430  1.1  mrg <h3 class="heading"><a name="TOC58"></a><a name="xtensa_002dx_002delf"></a>xtensa*-*-elf</h3>
   1431  1.1  mrg 
   1432  1.1  mrg <p>This target is intended for embedded Xtensa systems using the
   1433  1.1  mrg &lsquo;<samp><span class="samp">newlib</span></samp>&rsquo; C library.  It uses ELF but does not support shared
   1434  1.1  mrg objects.  Designed-defined instructions specified via the
   1435  1.1  mrg Tensilica Instruction Extension (TIE) language are only supported
   1436  1.1  mrg through inline assembly.
   1437  1.1  mrg 
   1438  1.1  mrg    <p>The Xtensa configuration information must be specified prior to
   1439  1.1  mrg building GCC.  The <samp><span class="file">include/xtensa-config.h</span></samp> header
   1440  1.1  mrg file contains the configuration information.  If you created your
   1441  1.1  mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1442  1.1  mrg downloaded files include a customized copy of this header file,
   1443  1.1  mrg which you can use to replace the default header file.
   1444  1.1  mrg 
   1445  1.1  mrg    <p><hr />
   1446  1.1  mrg 
   1447  1.1  mrg <h3 class="heading"><a name="TOC59"></a><a name="xtensa_002dx_002dlinux"></a>xtensa*-*-linux*</h3>
   1448  1.1  mrg 
   1449  1.1  mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1450  1.1  mrg shared objects and the GNU C library (glibc).  It also generates
   1451  1.1  mrg position-independent code (PIC) regardless of whether the
   1452  1.1  mrg <samp><span class="option">-fpic</span></samp> or <samp><span class="option">-fPIC</span></samp> options are used.  In other
   1453  1.1  mrg respects, this target is the same as the
   1454  1.1  mrg <a href="#xtensa*-*-elf">&lsquo;<samp><span class="samp">xtensa*-*-elf</span></samp>&rsquo;</a> target.
   1455  1.1  mrg 
   1456  1.1  mrg    <p><hr />
   1457  1.1  mrg 
   1458  1.1  mrg <h3 class="heading"><a name="TOC60"></a><a name="windows"></a>Microsoft Windows</h3>
   1459  1.1  mrg 
   1460  1.1  mrg <h4 class="subheading"><a name="TOC61"></a>Intel 16-bit versions</h4>
   1461  1.1  mrg 
   1462  1.1  mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1463  1.1  mrg supported.
   1464  1.1  mrg 
   1465  1.1  mrg    <p>However, the 32-bit port has limited support for Microsoft
   1466  1.1  mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1467  1.1  mrg 
   1468  1.1  mrg <h4 class="subheading"><a name="TOC62"></a>Intel 32-bit versions</h4>
   1469  1.1  mrg 
   1470  1.1  mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1471  1.1  mrg XP, and Windows Vista, are supported by several different target
   1472  1.1  mrg platforms.  These targets differ in which Windows subsystem they target
   1473  1.1  mrg and which C libraries are used.
   1474  1.1  mrg 
   1475  1.1  mrg      <ul>
   1476  1.1  mrg <li>Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1477  1.1  mrg Linux API emulation layer in the Win32 subsystem. 
   1478  1.1  mrg <li>Interix <a href="#x-x-interix">*-*-interix</a>: The Interix subsystem
   1479  1.1  mrg provides native support for POSIX. 
   1480  1.1  mrg <li>MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1481  1.1  mrg the Win32 subsystem that provides a subset of POSIX. 
   1482  1.1  mrg <li>MKS i386-pc-mks: NuTCracker from MKS.  See
   1483  1.1  mrg <a href="http://www.mkssoftware.com/">http://www.mkssoftware.com/</a> for more information. 
   1484  1.1  mrg </ul>
   1485  1.1  mrg 
   1486  1.1  mrg <h4 class="subheading"><a name="TOC63"></a>Intel 64-bit versions</h4>
   1487  1.1  mrg 
   1488  1.1  mrg <p>GCC contains support for x86-64 using the mingw-w64
   1489  1.1  mrg runtime library, available from <a href="http://mingw-w64.sourceforge.net/">http://mingw-w64.sourceforge.net/</a>. 
   1490  1.1  mrg This library should be used with the target triple x86_64-pc-mingw32.
   1491  1.1  mrg 
   1492  1.1  mrg    <p>Presently Windows for Itanium is not supported.
   1493  1.1  mrg 
   1494  1.1  mrg <h4 class="subheading"><a name="TOC64"></a>Windows CE</h4>
   1495  1.1  mrg 
   1496  1.1  mrg <p>Windows CE is supported as a target only on ARM (arm-wince-pe), Hitachi
   1497  1.1  mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1498  1.1  mrg 
   1499  1.1  mrg <h4 class="subheading"><a name="TOC65"></a>Other Windows Platforms</h4>
   1500  1.1  mrg 
   1501  1.1  mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1502  1.1  mrg 
   1503  1.1  mrg    <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1504  1.1  mrg support the Interix subsystem.  See above.
   1505  1.1  mrg 
   1506  1.1  mrg    <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1507  1.1  mrg 
   1508  1.1  mrg    <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1509  1.1  mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1510  1.1  mrg 
   1511  1.1  mrg    <p>UWIN support has been removed due to a lack of maintenance.
   1512  1.1  mrg 
   1513  1.1  mrg    <p><hr />
   1514  1.1  mrg 
   1515  1.1  mrg <h3 class="heading"><a name="TOC66"></a><a name="x_002dx_002dcygwin"></a>*-*-cygwin</h3>
   1516  1.1  mrg 
   1517  1.1  mrg <p>Ports of GCC are included with the
   1518  1.1  mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1519  1.1  mrg 
   1520  1.1  mrg    <p>GCC will build under Cygwin without modification; it does not build
   1521  1.1  mrg with Microsoft's C++ compiler and there are no plans to make it do so.
   1522  1.1  mrg 
   1523  1.1  mrg    <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1524  1.1  mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1525  1.1  mrg used with as up-to-date a version of binutils as possible; use either
   1526  1.1  mrg the latest official GNU binutils release in the Cygwin distribution,
   1527  1.1  mrg or version 2.20 or above if building your own.
   1528  1.1  mrg 
   1529  1.1  mrg    <p><hr />
   1530  1.1  mrg 
   1531  1.1  mrg <h3 class="heading"><a name="TOC67"></a><a name="x_002dx_002dinterix"></a>*-*-interix</h3>
   1532  1.1  mrg 
   1533  1.1  mrg <p>The Interix target is used by OpenNT, Interix, Services For UNIX (SFU),
   1534  1.1  mrg and Subsystem for UNIX-based Applications (SUA).  Applications compiled
   1535  1.1  mrg with this target run in the Interix subsystem, which is separate from
   1536  1.1  mrg the Win32 subsystem.  This target was last known to work in GCC 3.3.
   1537  1.1  mrg 
   1538  1.1  mrg    <p>For more information, see <a href="http://www.interix.com/">http://www.interix.com/</a>.
   1539  1.1  mrg 
   1540  1.1  mrg    <p><hr />
   1541  1.1  mrg 
   1542  1.1  mrg <h3 class="heading"><a name="TOC68"></a><a name="x_002dx_002dmingw32"></a>*-*-mingw32</h3>
   1543  1.1  mrg 
   1544  1.1  mrg <p>GCC will build with and support only MinGW runtime 3.12 and later. 
   1545  1.1  mrg Earlier versions of headers are incompatible with the new default semantics
   1546  1.1  mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1547  1.1  mrg 
   1548  1.1  mrg    <p><hr />
   1549  1.1  mrg 
   1550  1.1  mrg <h3 class="heading"><a name="TOC69"></a><a name="older"></a>Older systems</h3>
   1551  1.1  mrg 
   1552  1.1  mrg <p>GCC contains support files for many older (1980s and early
   1553  1.1  mrg 1990s) Unix variants.  For the most part, support for these systems
   1554  1.1  mrg has not been deliberately removed, but it has not been maintained for
   1555  1.1  mrg several years and may suffer from bitrot.
   1556  1.1  mrg 
   1557  1.1  mrg    <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems. 
   1558  1.1  mrg Support for these systems is still present in that release, but
   1559  1.1  mrg <samp><span class="command">configure</span></samp> will fail unless the <samp><span class="option">--enable-obsolete</span></samp>
   1560  1.1  mrg option is given.  Unless a maintainer steps forward, support for these
   1561  1.1  mrg systems will be removed from the next release of GCC.
   1562  1.1  mrg 
   1563  1.1  mrg    <p>Support for old systems as hosts for GCC can cause problems if the
   1564  1.1  mrg workarounds for compiler, library and operating system bugs affect the
   1565  1.1  mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1566  1.1  mrg bring GCC up on such a system, if still possible with current GCC, may
   1567  1.1  mrg require first installing an old version of GCC which did work on that
   1568  1.1  mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1569  1.1  mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1570  1.1  mrg <samp><span class="file">old-releases</span></samp> directory on the <a href="../mirrors.html">GCC mirror sites</a>.  Header bugs may generally be avoided using
   1571  1.1  mrg <samp><span class="command">fixincludes</span></samp>, but bugs or deficiencies in libraries and the
   1572  1.1  mrg operating system may still cause problems.
   1573  1.1  mrg 
   1574  1.1  mrg    <p>Support for older systems as targets for cross-compilation is less
   1575  1.1  mrg problematic than support for them as hosts for GCC; if an enthusiast
   1576  1.1  mrg wishes to make such a target work again (including resurrecting any of
   1577  1.1  mrg the targets that never worked with GCC 2, starting from the last
   1578  1.1  mrg version before they were removed), patches
   1579  1.1  mrg <a href="../contribute.html">following the usual requirements</a> would be
   1580  1.1  mrg likely to be accepted, since they should not affect the support for more
   1581  1.1  mrg modern targets.
   1582  1.1  mrg 
   1583  1.1  mrg    <p>For some systems, old versions of GNU binutils may also be useful,
   1584  1.1  mrg and are available from <samp><span class="file">pub/binutils/old-releases</span></samp> on
   1585  1.1  mrg <a href="http://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1586  1.1  mrg 
   1587  1.1  mrg    <p>Some of the information on specific systems above relates to
   1588  1.1  mrg such older systems, but much of the information
   1589  1.1  mrg about GCC on such systems (which may no longer be applicable to
   1590  1.1  mrg current GCC) is to be found in the GCC texinfo manual.
   1591  1.1  mrg 
   1592  1.1  mrg    <p><hr />
   1593  1.1  mrg 
   1594  1.1  mrg <h3 class="heading"><a name="TOC70"></a><a name="elf"></a>all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1595  1.1  mrg 
   1596  1.1  mrg <p>C++ support is significantly better on ELF targets if you use the
   1597  1.1  mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1598  1.1  mrg inlines, vtables and template instantiations will be discarded
   1599  1.1  mrg automatically.
   1600  1.1  mrg 
   1601  1.1  mrg    <p><hr />
   1602  1.1  mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1603  1.1  mrg 
   1604  1.1  mrg <!-- ***Old documentation****************************************************** -->
   1605  1.1  mrg <!-- ***GFDL******************************************************************** -->
   1606  1.1  mrg <!-- *************************************************************************** -->
   1607  1.1  mrg <!-- Part 6 The End of the Document -->
   1608  1.1  mrg </body></html>
   1609  1.1  mrg 
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