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     21  1.1    mrg      A GNU Manual
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     42  1.1    mrg <h1 class="settitle">Host/Target specific installation notes for GCC</h1>
     43  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>
     44  1.1    mrg Please read this document carefully <em>before</em> installing the
     45  1.1    mrg GNU Compiler Collection on your machine.
     46  1.1    mrg 
     47  1.1    mrg    <p>Note that this list of install notes is <em>not</em> a list of supported
     48  1.1    mrg hosts or targets.  Not all supported hosts and targets are listed
     49  1.1    mrg here, only the ones that require host-specific or target-specific
     50  1.3  skrll information have to.
     51  1.1    mrg 
     52  1.1    mrg      <ul>
     53  1.1    mrg <li><a href="#alpha-x-x">alpha*-*-*</a>
     54  1.3  skrll <li><a href="#alpha-dec-osf51">alpha*-dec-osf5.1</a>
     55  1.3  skrll <li><a href="#amd64-x-solaris210">amd64-*-solaris2.10</a>
     56  1.3  skrll <li><a href="#arm-x-eabi">arm-*-eabi</a>
     57  1.1    mrg <li><a href="#avr">avr</a>
     58  1.1    mrg <li><a href="#bfin">Blackfin</a>
     59  1.1    mrg <li><a href="#dos">DOS</a>
     60  1.1    mrg <li><a href="#x-x-freebsd">*-*-freebsd*</a>
     61  1.1    mrg <li><a href="#h8300-hms">h8300-hms</a>
     62  1.1    mrg <li><a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
     63  1.1    mrg <li><a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
     64  1.1    mrg <li><a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
     65  1.1    mrg <li><a href="#x-x-linux-gnu">*-*-linux-gnu</a>
     66  1.1    mrg <li><a href="#ix86-x-linux">i?86-*-linux*</a>
     67  1.3  skrll <li><a href="#ix86-x-solaris289">i?86-*-solaris2.9</a>
     68  1.1    mrg <li><a href="#ix86-x-solaris210">i?86-*-solaris2.10</a>
     69  1.1    mrg <li><a href="#ia64-x-linux">ia64-*-linux</a>
     70  1.1    mrg <li><a href="#ia64-x-hpux">ia64-*-hpux*</a>
     71  1.1    mrg <li><a href="#x-ibm-aix">*-ibm-aix*</a>
     72  1.1    mrg <li><a href="#iq2000-x-elf">iq2000-*-elf</a>
     73  1.1    mrg <li><a href="#lm32-x-elf">lm32-*-elf</a>
     74  1.1    mrg <li><a href="#lm32-x-uclinux">lm32-*-uclinux</a>
     75  1.1    mrg <li><a href="#m32c-x-elf">m32c-*-elf</a>
     76  1.1    mrg <li><a href="#m32r-x-elf">m32r-*-elf</a>
     77  1.1    mrg <li><a href="#m68k-x-x">m68k-*-*</a>
     78  1.1    mrg <li><a href="#m68k-uclinux">m68k-uclinux</a>
     79  1.1    mrg <li><a href="#mep-x-elf">mep-*-elf</a>
     80  1.3  skrll <li><a href="#microblaze-x-elf">microblaze-*-elf</a>
     81  1.1    mrg <li><a href="#mips-x-x">mips-*-*</a>
     82  1.1    mrg <li><a href="#mips-sgi-irix5">mips-sgi-irix5</a>
     83  1.1    mrg <li><a href="#mips-sgi-irix6">mips-sgi-irix6</a>
     84  1.1    mrg <li><a href="#powerpc-x-x">powerpc*-*-*</a>
     85  1.1    mrg <li><a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
     86  1.1    mrg <li><a href="#powerpc-x-elf">powerpc-*-elf</a>
     87  1.1    mrg <li><a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
     88  1.1    mrg <li><a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
     89  1.1    mrg <li><a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
     90  1.1    mrg <li><a href="#powerpc-x-eabi">powerpc-*-eabi</a>
     91  1.1    mrg <li><a href="#powerpcle-x-elf">powerpcle-*-elf</a>
     92  1.1    mrg <li><a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
     93  1.1    mrg <li><a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
     94  1.1    mrg <li><a href="#s390-x-linux">s390-*-linux*</a>
     95  1.1    mrg <li><a href="#s390x-x-linux">s390x-*-linux*</a>
     96  1.1    mrg <li><a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
     97  1.1    mrg <li><a href="#x-x-solaris2">*-*-solaris2*</a>
     98  1.3  skrll <li><a href="#sparc-x-x">sparc*-*-*</a>
     99  1.1    mrg <li><a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    100  1.1    mrg <li><a href="#sparc-sun-solaris210">sparc-sun-solaris2.10</a>
    101  1.1    mrg <li><a href="#sparc-x-linux">sparc-*-linux*</a>
    102  1.1    mrg <li><a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    103  1.1    mrg <li><a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    104  1.3  skrll <li><a href="#c6x-x-x">c6x-*-*</a>
    105  1.3  skrll <li><a href="#tilegx-x-linux">tilegx-*-linux*</a>
    106  1.3  skrll <li><a href="#tilepro-x-linux">tilepro-*-linux*</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  1.3  skrll <li><a href="#x86-64-x-solaris210">x86_64-*-solaris2.1[0-9]*</a>
    110  1.1    mrg <li><a href="#xtensa-x-elf">xtensa*-*-elf</a>
    111  1.1    mrg <li><a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    112  1.1    mrg <li><a href="#windows">Microsoft Windows</a>
    113  1.1    mrg <li><a href="#x-x-cygwin">*-*-cygwin</a>
    114  1.1    mrg <li><a href="#x-x-interix">*-*-interix</a>
    115  1.1    mrg <li><a href="#x-x-mingw32">*-*-mingw32</a>
    116  1.1    mrg <li><a href="#os2">OS/2</a>
    117  1.1    mrg <li><a href="#older">Older systems</a>
    118  1.1    mrg </ul>
    119  1.1    mrg 
    120  1.1    mrg      <ul>
    121  1.1    mrg <li><a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.) 
    122  1.1    mrg </ul>
    123  1.1    mrg 
    124  1.1    mrg    <p><!-- -------- host/target specific issues start here ---------------- -->
    125  1.1    mrg <hr />
    126  1.1    mrg 
    127  1.1    mrg <h3 class="heading"><a name="TOC0"></a><a name="alpha_002dx_002dx"></a>alpha*-*-*</h3>
    128  1.1    mrg 
    129  1.1    mrg <p>This section contains general configuration information for all
    130  1.1    mrg alpha-based platforms using ELF (in particular, ignore this section for
    131  1.1    mrg DEC OSF/1, Digital UNIX and Tru64 UNIX).  In addition to reading this
    132  1.1    mrg section, please read all other sections that match your target.
    133  1.1    mrg 
    134  1.1    mrg    <p>We require binutils 2.11.2 or newer. 
    135  1.1    mrg Previous binutils releases had a number of problems with DWARF 2
    136  1.1    mrg debugging information, not the least of which is incorrect linking of
    137  1.1    mrg shared libraries.
    138  1.1    mrg 
    139  1.1    mrg    <p><hr />
    140  1.1    mrg 
    141  1.3  skrll <h3 class="heading"><a name="TOC1"></a><a name="alpha_002ddec_002dosf51"></a>alpha*-dec-osf5.1</h3>
    142  1.1    mrg 
    143  1.1    mrg <p>Systems using processors that implement the DEC Alpha architecture and
    144  1.1    mrg are running the DEC/Compaq/HP Unix (DEC OSF/1, Digital UNIX, or Compaq/HP
    145  1.1    mrg Tru64 UNIX) operating system, for example the DEC Alpha AXP systems.
    146  1.1    mrg 
    147  1.3  skrll    <p>Support for Tru64 UNIX V5.1 has been removed in GCC 4.8.  As of GCC 4.6,
    148  1.3  skrll support for Tru64 UNIX V4.0 and V5.0 has been removed.  As of GCC 3.2,
    149  1.3  skrll versions before <code>alpha*-dec-osf4</code> are no longer supported.  (These
    150  1.3  skrll are the versions which identify themselves as DEC OSF/1.)
    151  1.1    mrg 
    152  1.1    mrg    <p><hr />
    153  1.1    mrg 
    154  1.3  skrll <h3 class="heading"><a name="TOC2"></a><a name="amd64_002dx_002dsolaris210"></a>amd64-*-solaris2.1[0-9]*</h3>
    155  1.1    mrg 
    156  1.3  skrll <p>This is a synonym for &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo;.
    157  1.1    mrg 
    158  1.1    mrg    <p><hr />
    159  1.1    mrg 
    160  1.3  skrll <h3 class="heading"><a name="TOC3"></a><a name="arm_002dx_002deabi"></a>arm-*-eabi</h3>
    161  1.1    mrg 
    162  1.1    mrg <p>ARM-family processors.  Subtargets that use the ELF object format
    163  1.1    mrg require GNU binutils 2.13 or newer.  Such subtargets include:
    164  1.3  skrll <code>arm-*-netbsdelf</code>, <code>arm-*-*linux-*</code>
    165  1.3  skrll and <code>arm-*-rtemseabi</code>.
    166  1.1    mrg 
    167  1.1    mrg    <p><hr />
    168  1.1    mrg 
    169  1.1    mrg <h3 class="heading"><a name="TOC4"></a><a name="avr"></a>avr</h3>
    170  1.1    mrg 
    171  1.1    mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    172  1.1    mrg applications.  There are no standard Unix configurations. 
    173  1.1    mrg See &ldquo;AVR Options&rdquo; in the main manual
    174  1.1    mrg for the list of supported MCU types.
    175  1.1    mrg 
    176  1.1    mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=avr --enable-languages="c"</span></samp>&rsquo; to configure GCC.
    177  1.1    mrg 
    178  1.1    mrg    <p>Further installation notes and other useful information about AVR tools
    179  1.1    mrg can also be obtained from:
    180  1.1    mrg 
    181  1.1    mrg      <ul>
    182  1.1    mrg <li><a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    183  1.1    mrg <li><a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    184  1.1    mrg </ul>
    185  1.1    mrg 
    186  1.1    mrg    <p>We <em>strongly</em> recommend using binutils 2.13 or newer.
    187  1.1    mrg 
    188  1.1    mrg    <p>The following error:
    189  1.3  skrll <pre class="smallexample">     Error: register required
    190  1.1    mrg </pre>
    191  1.1    mrg    <p>indicates that you should upgrade to a newer version of the binutils.
    192  1.1    mrg 
    193  1.1    mrg    <p><hr />
    194  1.1    mrg 
    195  1.1    mrg <h3 class="heading"><a name="TOC5"></a><a name="bfin"></a>Blackfin</h3>
    196  1.1    mrg 
    197  1.1    mrg <p>The Blackfin processor, an Analog Devices DSP. 
    198  1.1    mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    199  1.1    mrg 
    200  1.1    mrg    <p>More information, and a version of binutils with support for this processor,
    201  1.1    mrg is available at <a href="http://blackfin.uclinux.org">http://blackfin.uclinux.org</a>
    202  1.1    mrg 
    203  1.1    mrg    <p><hr />
    204  1.1    mrg 
    205  1.3  skrll <h3 class="heading"><a name="TOC6"></a><a name="cr16"></a>CR16</h3>
    206  1.3  skrll 
    207  1.3  skrll <p>The CR16 CompactRISC architecture is a 16-bit architecture. This architecture is
    208  1.3  skrll used in embedded applications.
    209  1.3  skrll 
    210  1.3  skrll    <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    211  1.3  skrll 
    212  1.3  skrll    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-elf --enable-languages=c,c++</span></samp>&rsquo; to configure
    213  1.3  skrll GCC for building a CR16 elf cross-compiler.
    214  1.3  skrll 
    215  1.3  skrll    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-uclinux --enable-languages=c,c++</span></samp>&rsquo; to configure
    216  1.3  skrll GCC for building a CR16 uclinux cross-compiler.
    217  1.3  skrll 
    218  1.3  skrll    <p><hr />
    219  1.3  skrll 
    220  1.3  skrll <h3 class="heading"><a name="TOC7"></a><a name="cris"></a>CRIS</h3>
    221  1.1    mrg 
    222  1.1    mrg <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    223  1.1    mrg series.  These are used in embedded applications.
    224  1.1    mrg 
    225  1.1    mrg    <p>See &ldquo;CRIS Options&rdquo; in the main manual
    226  1.1    mrg for a list of CRIS-specific options.
    227  1.1    mrg 
    228  1.1    mrg    <p>There are a few different CRIS targets:
    229  1.1    mrg      <dl>
    230  1.1    mrg <dt><code>cris-axis-elf</code><dd>Mainly for monolithic embedded systems.  Includes a multilib for the
    231  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;. 
    232  1.1    mrg <br><dt><code>cris-axis-linux-gnu</code><dd>A GNU/Linux port for the CRIS architecture, currently targeting
    233  1.1    mrg &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo; by default. 
    234  1.1    mrg </dl>
    235  1.1    mrg 
    236  1.1    mrg    <p>For <code>cris-axis-elf</code> you need binutils 2.11
    237  1.1    mrg or newer.  For <code>cris-axis-linux-gnu</code> you need binutils 2.12 or newer.
    238  1.1    mrg 
    239  1.1    mrg    <p>Pre-packaged tools can be obtained from
    240  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
    241  1.1    mrg information about this platform is available at
    242  1.1    mrg <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    243  1.1    mrg 
    244  1.1    mrg    <p><hr />
    245  1.1    mrg 
    246  1.1    mrg <h3 class="heading"><a name="TOC8"></a><a name="dos"></a>DOS</h3>
    247  1.1    mrg 
    248  1.1    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    249  1.1    mrg 
    250  1.1    mrg    <p>You cannot install GCC by itself on MSDOS; it will not compile under
    251  1.1    mrg any MSDOS compiler except itself.  You need to get the complete
    252  1.1    mrg compilation package DJGPP, which includes binaries as well as sources,
    253  1.1    mrg and includes all the necessary compilation tools and libraries.
    254  1.1    mrg 
    255  1.1    mrg    <p><hr />
    256  1.1    mrg 
    257  1.3  skrll <h3 class="heading"><a name="TOC9"></a><a name="epiphany_002dx_002delf"></a>epiphany-*-elf</h3>
    258  1.3  skrll 
    259  1.3  skrll <p>Adapteva Epiphany. 
    260  1.3  skrll This configuration is intended for embedded systems.
    261  1.3  skrll 
    262  1.3  skrll    <p><hr />
    263  1.3  skrll 
    264  1.3  skrll <h3 class="heading"><a name="TOC10"></a><a name="x_002dx_002dfreebsd"></a>*-*-freebsd*</h3>
    265  1.1    mrg 
    266  1.1    mrg <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    267  1.1    mrg FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    268  1.1    mrg discontinued in GCC 4.0.
    269  1.1    mrg 
    270  1.3  skrll    <p>In order to better utilize FreeBSD base system functionality and match
    271  1.3  skrll the configuration of the system compiler, GCC 4.5 and above as well as
    272  1.3  skrll GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    273  1.3  skrll on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    274  1.3  skrll (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    275  1.3  skrll <samp><span class="file">libgcc_s.so.1</span></samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    276  1.3  skrll by GCC 4.5 and above.
    277  1.1    mrg 
    278  1.1    mrg    <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    279  1.1    mrg for all CPU architectures.  You may use <samp><span class="option">-gstabs</span></samp> instead of
    280  1.1    mrg <samp><span class="option">-g</span></samp>, if you really want the old debugging format.  There are
    281  1.1    mrg no known issues with mixing object files and libraries with different
    282  1.1    mrg debugging formats.  Otherwise, this release of GCC should now match
    283  1.1    mrg more of the configuration used in the stock FreeBSD configuration of
    284  1.1    mrg GCC.  In particular, <samp><span class="option">--enable-threads</span></samp> is now configured by
    285  1.1    mrg default.  However, as a general user, do not attempt to replace the
    286  1.1    mrg system compiler with this release.  Known to bootstrap and check with
    287  1.1    mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    288  1.1    mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    289  1.1    mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    290  1.1    mrg 
    291  1.1    mrg    <p>The version of binutils installed in <samp><span class="file">/usr/bin</span></samp> probably works
    292  1.1    mrg with this release of GCC.  Bootstrapping against the latest GNU
    293  1.1    mrg binutils and/or the version found in <samp><span class="file">/usr/ports/devel/binutils</span></samp> has
    294  1.1    mrg been known to enable additional features and improve overall testsuite
    295  1.1    mrg results.  However, it is currently known that boehm-gc (which itself
    296  1.1    mrg is required for java) may not configure properly on FreeBSD prior to
    297  1.1    mrg the FreeBSD 7.0 release with GNU binutils after 2.16.1.
    298  1.1    mrg 
    299  1.1    mrg    <p><hr />
    300  1.1    mrg 
    301  1.3  skrll <h3 class="heading"><a name="TOC11"></a><a name="h8300_002dhms"></a>h8300-hms</h3>
    302  1.1    mrg 
    303  1.1    mrg <p>Renesas H8/300 series of processors.
    304  1.1    mrg 
    305  1.1    mrg    <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    306  1.1    mrg 
    307  1.1    mrg    <p>The calling convention and structure layout has changed in release 2.6. 
    308  1.1    mrg All code must be recompiled.  The calling convention now passes the
    309  1.1    mrg first three arguments in function calls in registers.  Structures are no
    310  1.1    mrg longer a multiple of 2 bytes.
    311  1.1    mrg 
    312  1.1    mrg    <p><hr />
    313  1.1    mrg 
    314  1.3  skrll <h3 class="heading"><a name="TOC12"></a><a name="hppa_002dhp_002dhpux"></a>hppa*-hp-hpux*</h3>
    315  1.1    mrg 
    316  1.1    mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    317  1.1    mrg 
    318  1.1    mrg    <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    319  1.1    mrg later is recommended.
    320  1.1    mrg 
    321  1.1    mrg    <p>It may be helpful to configure GCC with the
    322  1.1    mrg <a href="./configure.html#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> and
    323  1.1    mrg <samp><span class="option">--with-as=...</span></samp> options to ensure that GCC can find GAS.
    324  1.1    mrg 
    325  1.1    mrg    <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    326  1.1    mrg not work.  It shouldn't be used with any languages other than C due to its
    327  1.1    mrg many limitations.
    328  1.1    mrg 
    329  1.1    mrg    <p>Specifically, <samp><span class="option">-g</span></samp> does not work (HP-UX uses a peculiar debugging
    330  1.1    mrg format which GCC does not know about).  It also inserts timestamps
    331  1.1    mrg into each object file it creates, causing the 3-stage comparison test to
    332  1.1    mrg fail during a bootstrap.  You should be able to continue by saying
    333  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;.
    334  1.1    mrg 
    335  1.1    mrg    <p>Various GCC features are not supported.  For example, it does not support weak
    336  1.1    mrg symbols or alias definitions.  As a result, explicit template instantiations
    337  1.1    mrg are required when using C++.  This makes it difficult if not impossible to
    338  1.1    mrg build many C++ applications.
    339  1.1    mrg 
    340  1.1    mrg    <p>There are two default scheduling models for instructions.  These are
    341  1.1    mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    342  1.1    mrg architecture specified for the target machine when configuring. 
    343  1.1    mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    344  1.1    mrg the target is a &lsquo;<samp><span class="samp">hppa1*</span></samp>&rsquo; machine.
    345  1.1    mrg 
    346  1.1    mrg    <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    347  1.1    mrg it is important to completely specify the machine architecture when
    348  1.1    mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    349  1.1    mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    350  1.1    mrg default scheduling model is desired.
    351  1.1    mrg 
    352  1.1    mrg    <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    353  1.1    mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later. 
    354  1.1    mrg This namespace change might cause problems when bootstrapping with
    355  1.1    mrg an earlier version of GCC or the HP compiler as essentially the same
    356  1.1    mrg namespace is required for an entire build.  This problem can be avoided
    357  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;
    358  1.1    mrg or &lsquo;<samp><span class="samp">98</span></samp>&rsquo;.  Another way is to add an appropriate set of predefines
    359  1.1    mrg to <samp><span class="env">CC</span></samp>.  The description for the <samp><span class="option">munix=</span></samp> option contains
    360  1.1    mrg a list of the predefines used with each standard.
    361  1.1    mrg 
    362  1.1    mrg    <p>More specific information to &lsquo;<samp><span class="samp">hppa*-hp-hpux*</span></samp>&rsquo; targets follows.
    363  1.1    mrg 
    364  1.1    mrg    <p><hr />
    365  1.1    mrg 
    366  1.3  skrll <h3 class="heading"><a name="TOC13"></a><a name="hppa_002dhp_002dhpux10"></a>hppa*-hp-hpux10</h3>
    367  1.1    mrg 
    368  1.1    mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    369  1.1    mrg <code>PHCO_19798</code> from HP.
    370  1.1    mrg 
    371  1.1    mrg    <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    372  1.1    mrg used for one-only code and data.  This resolves many of the previous
    373  1.1    mrg problems in using C++ on this target.  However, the ABI is not compatible
    374  1.1    mrg with the one implemented under HP-UX 11 using secondary definitions.
    375  1.1    mrg 
    376  1.1    mrg    <p><hr />
    377  1.1    mrg 
    378  1.3  skrll <h3 class="heading"><a name="TOC14"></a><a name="hppa_002dhp_002dhpux11"></a>hppa*-hp-hpux11</h3>
    379  1.1    mrg 
    380  1.1    mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    381  1.1    mrg be used to compile GCC 3.0 and up.
    382  1.1    mrg 
    383  1.1    mrg    <p>The libffi and libjava libraries haven't been ported to 64-bit HP-UX and don't build.
    384  1.1    mrg 
    385  1.1    mrg    <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    386  1.1    mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    387  1.1    mrg to build the Ada language as it can't be bootstrapped using C.  Ada is
    388  1.1    mrg only available for the 32-bit PA-RISC runtime.
    389  1.1    mrg 
    390  1.1    mrg    <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    391  1.1    mrg bundled compiler supports only traditional C; you will need either HP's
    392  1.1    mrg unbundled compiler, or a binary distribution of GCC.
    393  1.1    mrg 
    394  1.1    mrg    <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    395  1.1    mrg but the process requires several steps.  GCC 3.3 can then be used to
    396  1.1    mrg build later versions.  The fastjar program contains ISO C code and
    397  1.1    mrg can't be built with the HP bundled compiler.  This problem can be
    398  1.1    mrg avoided by not building the Java language.  For example, use the
    399  1.1    mrg <samp><span class="option">--enable-languages="c,c++,f77,objc"</span></samp> option in your configure
    400  1.1    mrg command.
    401  1.1    mrg 
    402  1.1    mrg    <p>There are several possible approaches to building the distribution. 
    403  1.1    mrg Binutils can be built first using the HP tools.  Then, the GCC
    404  1.1    mrg distribution can be built.  The second approach is to build GCC
    405  1.1    mrg first using the HP tools, then build binutils, then rebuild GCC. 
    406  1.1    mrg There have been problems with various binary distributions, so it
    407  1.1    mrg is best not to start from a binary distribution.
    408  1.1    mrg 
    409  1.1    mrg    <p>On 64-bit capable systems, there are two distinct targets.  Different
    410  1.1    mrg installation prefixes must be used if both are to be installed on
    411  1.1    mrg the same system.  The &lsquo;<samp><span class="samp">hppa[1-2]*-hp-hpux11*</span></samp>&rsquo; target generates code
    412  1.1    mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker. 
    413  1.1    mrg The &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target generates 64-bit code for the
    414  1.1    mrg PA-RISC 2.0 architecture.
    415  1.1    mrg 
    416  1.1    mrg    <p>The script config.guess now selects the target type based on the compiler
    417  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
    418  1.1    mrg that configure finds an appropriate compiler for the initial bootstrap. 
    419  1.1    mrg When <samp><span class="env">CC</span></samp> is used, the definition should contain the options that are
    420  1.1    mrg needed whenever <samp><span class="env">CC</span></samp> is used.
    421  1.1    mrg 
    422  1.1    mrg    <p>Specifically, options that determine the runtime architecture must be
    423  1.1    mrg in <samp><span class="env">CC</span></samp> to correctly select the target for the build.  It is also
    424  1.1    mrg convenient to place many other compiler options in <samp><span class="env">CC</span></samp>.  For example,
    425  1.1    mrg <samp><span class="env">CC="cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE"</span></samp>
    426  1.1    mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    427  1.1    mrg 64-bit K&amp;R/bundled mode.  The <samp><span class="option">+DA2.0W</span></samp> option will result in
    428  1.1    mrg the automatic selection of the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target.  The
    429  1.1    mrg macro definition table of cpp needs to be increased for a successful
    430  1.1    mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    431  1.1    mrg be defined when building with the bundled compiler, or when using the
    432  1.1    mrg <samp><span class="option">-Ac</span></samp> option.  These defines aren't necessary with <samp><span class="option">-Ae</span></samp>.
    433  1.1    mrg 
    434  1.1    mrg    <p>It is best to explicitly configure the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target
    435  1.1    mrg with the <samp><span class="option">--with-ld=...</span></samp> option.  This overrides the standard
    436  1.1    mrg search for ld.  The two linkers supported on this target require different
    437  1.1    mrg commands.  The default linker is determined during configuration.  As a
    438  1.1    mrg result, it's not possible to switch linkers in the middle of a GCC build. 
    439  1.1    mrg This has been reported to sometimes occur in unified builds of binutils
    440  1.1    mrg and GCC.
    441  1.1    mrg 
    442  1.1    mrg    <p>A recent linker patch must be installed for the correct operation of
    443  1.1    mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    444  1.1    mrg oldest linker patches that are known to work.  They are for HP-UX
    445  1.1    mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    446  1.1    mrg <code>PHSS_24304</code>, might be usable but it hasn't been tested.  These
    447  1.1    mrg patches have been superseded.  Consult the HP patch database to obtain
    448  1.1    mrg the currently recommended linker patch for your system.
    449  1.1    mrg 
    450  1.1    mrg    <p>The patches are necessary for the support of weak symbols on the
    451  1.1    mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    452  1.1    mrg symbols are implemented using SOM secondary definition symbols.  Prior
    453  1.1    mrg to HP-UX 11, there are bugs in the linker support for secondary symbols. 
    454  1.1    mrg The patches correct a problem of linker core dumps creating shared
    455  1.1    mrg libraries containing secondary symbols, as well as various other
    456  1.1    mrg linking issues involving secondary symbols.
    457  1.1    mrg 
    458  1.1    mrg    <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    459  1.1    mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    460  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
    461  1.1    mrg purpose.  The patches correct various problems with the +init/+fini
    462  1.1    mrg options, including program core dumps.  Binutils 2.14 corrects a
    463  1.1    mrg problem on the 64-bit port resulting from HP's non-standard use of
    464  1.1    mrg the .init and .fini sections for array initializers and finalizers.
    465  1.1    mrg 
    466  1.1    mrg    <p>Although the HP and GNU linkers are both supported for the
    467  1.1    mrg &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target, it is strongly recommended that the
    468  1.1    mrg HP linker be used for link editing on this target.
    469  1.1    mrg 
    470  1.1    mrg    <p>At this time, the GNU linker does not support the creation of long
    471  1.1    mrg branch stubs.  As a result, it can't successfully link binaries
    472  1.1    mrg containing branch offsets larger than 8 megabytes.  In addition,
    473  1.1    mrg there are problems linking shared libraries, linking executables
    474  1.1    mrg with <samp><span class="option">-static</span></samp>, and with dwarf2 unwind and exception support. 
    475  1.1    mrg It also doesn't provide stubs for internal calls to global functions
    476  1.1    mrg in shared libraries, so these calls can't be overloaded.
    477  1.1    mrg 
    478  1.1    mrg    <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    479  1.1    mrg versioning is not supported.  It may be necessary to disable symbol
    480  1.1    mrg versioning with <samp><span class="option">--disable-symvers</span></samp> when using GNU ld.
    481  1.1    mrg 
    482  1.1    mrg    <p>POSIX threads are the default.  The optional DCE thread library is not
    483  1.1    mrg supported, so <samp><span class="option">--enable-threads=dce</span></samp> does not work.
    484  1.1    mrg 
    485  1.1    mrg    <p><hr />
    486  1.1    mrg 
    487  1.3  skrll <h3 class="heading"><a name="TOC15"></a><a name="x_002dx_002dlinux_002dgnu"></a>*-*-linux-gnu</h3>
    488  1.1    mrg 
    489  1.1    mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    490  1.1    mrg in glibc 2.2.5 and later.  More information is available in the
    491  1.1    mrg libstdc++-v3 documentation.
    492  1.1    mrg 
    493  1.1    mrg    <p><hr />
    494  1.1    mrg 
    495  1.3  skrll <h3 class="heading"><a name="TOC16"></a><a name="ix86_002dx_002dlinux"></a>i?86-*-linux*</h3>
    496  1.1    mrg 
    497  1.1    mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform. 
    498  1.1    mrg See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    499  1.1    mrg 
    500  1.1    mrg    <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    501  1.1    mrg possible you have a hardware problem.  Further information on this can be
    502  1.1    mrg found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    503  1.1    mrg 
    504  1.1    mrg    <p><hr />
    505  1.1    mrg 
    506  1.3  skrll <h3 class="heading"><a name="TOC17"></a><a name="ix86_002dx_002dsolaris29"></a>i?86-*-solaris2.9</h3>
    507  1.1    mrg 
    508  1.3  skrll <p>The Sun assembler in Solaris 9 has several bugs and limitations. 
    509  1.1    mrg While GCC works around them, several features are missing, so it is
    510  1.1    mrg <!-- FIXME: which ones? -->
    511  1.1    mrg recommended to use the GNU assembler instead.  There is no bundled
    512  1.3  skrll version, but the current version, from GNU binutils 2.22, is known to
    513  1.1    mrg work.
    514  1.1    mrg 
    515  1.3  skrll    <p>Solaris&nbsp;2/x86 doesn't support the execution of SSE/SSE2 instructions
    516  1.3  skrll before Solaris&nbsp;9 4/04, even if the CPU supports them.  Programs will
    517  1.1    mrg receive <code>SIGILL</code> if they try.  The fix is available both in
    518  1.3  skrll Solaris&nbsp;9 Update&nbsp;6 and kernel patch 112234-12 or newer.  To
    519  1.3  skrll avoid this problem,
    520  1.3  skrll <samp><span class="option">-march</span></samp> defaults to &lsquo;<samp><span class="samp">pentiumpro</span></samp>&rsquo; on Solaris 9.  If
    521  1.1    mrg you have the patch installed, you can configure GCC with an appropriate
    522  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.
    523  1.1    mrg 
    524  1.1    mrg    <p><hr />
    525  1.1    mrg 
    526  1.3  skrll <h3 class="heading"><a name="TOC18"></a><a name="ix86_002dx_002dsolaris210"></a>i?86-*-solaris2.10</h3>
    527  1.1    mrg 
    528  1.3  skrll <p>Use this for Solaris 10 or later on x86 and x86-64 systems.  Starting
    529  1.3  skrll with GCC 4.7, there is also a 64-bit &lsquo;<samp><span class="samp">amd64-*-solaris2.1[0-9]*</span></samp>&rsquo; or
    530  1.3  skrll &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo; configuration that corresponds to
    531  1.3  skrll &lsquo;<samp><span class="samp">sparcv9-sun-solaris2*</span></samp>&rsquo;.
    532  1.1    mrg 
    533  1.1    mrg    <p>It is recommended that you configure GCC to use the GNU assembler, in
    534  1.1    mrg <samp><span class="file">/usr/sfw/bin/gas</span></samp>.  The versions included in Solaris 10, from GNU
    535  1.1    mrg binutils 2.15, and Solaris 11, from GNU binutils 2.19, work fine,
    536  1.1    mrg although the current version, from GNU binutils
    537  1.3  skrll 2.22, is known to work, too.  Recent versions of the Sun assembler in
    538  1.1    mrg <samp><span class="file">/usr/ccs/bin/as</span></samp> work almost as well, though. 
    539  1.1    mrg <!-- FIXME: as patch requirements? -->
    540  1.1    mrg 
    541  1.1    mrg    <p>For linking, the Sun linker, is preferred.  If you want to use the GNU
    542  1.1    mrg linker instead, which is available in <samp><span class="file">/usr/sfw/bin/gld</span></samp>, note that
    543  1.1    mrg due to a packaging bug the version in Solaris 10, from GNU binutils
    544  1.1    mrg 2.15, cannot be used, while the version in Solaris 11, from GNU binutils
    545  1.3  skrll 2.19, works, as does the latest version, from GNU binutils 2.22.
    546  1.1    mrg 
    547  1.1    mrg    <p>To use GNU <samp><span class="command">as</span></samp>, configure with the options
    548  1.1    mrg <samp><span class="option">--with-gnu-as --with-as=/usr/sfw/bin/gas</span></samp>.  It may be necessary
    549  1.1    mrg to configure with <samp><span class="option">--without-gnu-ld --with-ld=/usr/ccs/bin/ld</span></samp> to
    550  1.1    mrg guarantee use of Sun <samp><span class="command">ld</span></samp>. 
    551  1.1    mrg <!-- FIXME: why -without-gnu-ld -with-ld? -->
    552  1.1    mrg 
    553  1.1    mrg    <p><hr />
    554  1.1    mrg 
    555  1.3  skrll <h3 class="heading"><a name="TOC19"></a><a name="ia64_002dx_002dlinux"></a>ia64-*-linux</h3>
    556  1.1    mrg 
    557  1.1    mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    558  1.1    mrg running GNU/Linux.
    559  1.1    mrg 
    560  1.1    mrg    <p>If you are using the installed system libunwind library with
    561  1.1    mrg <samp><span class="option">--with-system-libunwind</span></samp>, then you must use libunwind 0.98 or
    562  1.1    mrg later.
    563  1.1    mrg 
    564  1.1    mrg    <p>None of the following versions of GCC has an ABI that is compatible
    565  1.1    mrg with any of the other versions in this list, with the exception that
    566  1.1    mrg Red Hat 2.96 and Trillian 000171 are compatible with each other:
    567  1.1    mrg 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. 
    568  1.1    mrg This primarily affects C++ programs and programs that create shared libraries. 
    569  1.1    mrg GCC 3.1 or later is recommended for compiling linux, the kernel. 
    570  1.1    mrg As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    571  1.1    mrg more major ABI changes are expected.
    572  1.1    mrg 
    573  1.1    mrg    <p><hr />
    574  1.1    mrg 
    575  1.3  skrll <h3 class="heading"><a name="TOC20"></a><a name="ia64_002dx_002dhpux"></a>ia64-*-hpux*</h3>
    576  1.1    mrg 
    577  1.1    mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    578  1.1    mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    579  1.1    mrg the option <samp><span class="option">--with-gnu-as</span></samp> may be necessary.
    580  1.1    mrg 
    581  1.1    mrg    <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    582  1.1    mrg GCC versions 3.2.3 and earlier, <samp><span class="option">--enable-libunwind-exceptions</span></samp>
    583  1.1    mrg is required to build GCC.  For GCC 3.3 and later, this is the default. 
    584  1.1    mrg For gcc 3.4.3 and later, <samp><span class="option">--enable-libunwind-exceptions</span></samp> is
    585  1.1    mrg removed and the system libunwind library will always be used.
    586  1.1    mrg 
    587  1.1    mrg    <p><hr />
    588  1.1    mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    589  1.1    mrg 
    590  1.3  skrll <h3 class="heading"><a name="TOC21"></a><a name="x_002dibm_002daix"></a>*-ibm-aix*</h3>
    591  1.1    mrg 
    592  1.1    mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4. 
    593  1.1    mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    594  1.1    mrg 
    595  1.1    mrg    <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    596  1.1    mrg process resource limits (ulimit).  Hard limits are configured in the
    597  1.1    mrg <samp><span class="file">/etc/security/limits</span></samp> system configuration file.
    598  1.1    mrg 
    599  1.1    mrg    <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    600  1.1    mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    601  1.1    mrg requires a larger data segment, which can be enabled through the
    602  1.1    mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    603  1.1    mrg 
    604  1.3  skrll <pre class="smallexample">     % LDR_CNTRL=MAXDATA=0x50000000
    605  1.3  skrll      % export LDR_CNTRL
    606  1.1    mrg </pre>
    607  1.1    mrg    <p>One can start with a pre-compiled version of GCC to build from
    608  1.1    mrg sources.  One may delete GCC's &ldquo;fixed&rdquo; header files when starting
    609  1.1    mrg with a version of GCC built for an earlier release of AIX.
    610  1.1    mrg 
    611  1.1    mrg    <p>To speed up the configuration phases of bootstrapping and installing GCC,
    612  1.1    mrg one may use GNU Bash instead of AIX <samp><span class="command">/bin/sh</span></samp>, e.g.,
    613  1.1    mrg 
    614  1.3  skrll <pre class="smallexample">     % CONFIG_SHELL=/opt/freeware/bin/bash
    615  1.3  skrll      % export CONFIG_SHELL
    616  1.1    mrg </pre>
    617  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
    618  1.1    mrg to invoke <var>srcdir</var>/configure.
    619  1.1    mrg 
    620  1.1    mrg    <p>Because GCC on AIX is built as a 32-bit executable by default,
    621  1.1    mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    622  1.1    mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    623  1.1    mrg as static archive libraries works better than shared libraries.
    624  1.1    mrg 
    625  1.1    mrg    <p>Errors involving <code>alloca</code> when building GCC generally are due
    626  1.1    mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    627  1.1    mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    628  1.1    mrg the build, the native AIX compiler <strong>must</strong> be invoked as <samp><span class="command">cc</span></samp>
    629  1.1    mrg (not <samp><span class="command">xlc</span></samp>).  Once <samp><span class="command">configure</span></samp> has been informed of
    630  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
    631  1.1    mrg configure cache files and ensure that <samp><span class="env">CC</span></samp> environment variable
    632  1.1    mrg does not provide a definition that will confuse <samp><span class="command">configure</span></samp>. 
    633  1.1    mrg If this error occurs during stage2 or later, then the problem most likely
    634  1.1    mrg is the version of Make (see above).
    635  1.1    mrg 
    636  1.3  skrll    <p>The native <samp><span class="command">as</span></samp> and <samp><span class="command">ld</span></samp> are recommended for
    637  1.3  skrll bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    638  1.3  skrll Binutils version 2.20 is the minimum level that supports bootstrap on
    639  1.3  skrll AIX 5.  The GNU Assembler has not been updated to support AIX 6 or
    640  1.3  skrll AIX 7.  The native AIX tools do interoperate with GCC.
    641  1.3  skrll 
    642  1.3  skrll    <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    643  1.3  skrll assembler change that sometimes produces corrupt assembly files
    644  1.3  skrll causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    645  1.3  skrll can cause compilation failures with existing GCC installations.  An
    646  1.3  skrll AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    647  1.3  skrll IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    648  1.3  skrll AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    649  1.3  skrll AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    650  1.1    mrg 
    651  1.1    mrg    <p>Building <samp><span class="file">libstdc++.a</span></samp> requires a fix for an AIX Assembler bug
    652  1.1    mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    653  1.1    mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    654  1.1    mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    655  1.1    mrg 
    656  1.1    mrg    <p>&lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; in GCC 3.4 increments the major version number of the
    657  1.1    mrg shared object and GCC installation places the <samp><span class="file">libstdc++.a</span></samp>
    658  1.1    mrg shared library in a common location which will overwrite the and GCC
    659  1.1    mrg 3.3 version of the shared library.  Applications either need to be
    660  1.1    mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    661  1.1    mrg versions of the &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; shared object needs to be available
    662  1.1    mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp><span class="samp">libstdc++.so.4</span></samp>&rsquo;, if
    663  1.1    mrg present, and GCC 3.3 &lsquo;<samp><span class="samp">libstdc++.so.5</span></samp>&rsquo; shared objects can be
    664  1.1    mrg installed for runtime dynamic loading using the following steps to set
    665  1.1    mrg the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag in the shared object for <em>each</em>
    666  1.1    mrg multilib <samp><span class="file">libstdc++.a</span></samp> installed:
    667  1.1    mrg 
    668  1.1    mrg    <p>Extract the shared objects from the currently installed
    669  1.1    mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    670  1.3  skrll <pre class="smallexample">     % ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    671  1.1    mrg </pre>
    672  1.1    mrg    <p>Enable the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag so that the shared object will be
    673  1.1    mrg available for runtime dynamic loading, but not linking:
    674  1.3  skrll <pre class="smallexample">     % strip -e libstdc++.so.4 libstdc++.so.5
    675  1.1    mrg </pre>
    676  1.1    mrg    <p>Archive the runtime-only shared object in the GCC 3.4
    677  1.1    mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    678  1.3  skrll <pre class="smallexample">     % ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    679  1.1    mrg </pre>
    680  1.1    mrg    <p>Linking executables and shared libraries may produce warnings of
    681  1.1    mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    682  1.1    mrg have included multiple symbol definitions for certain global variable
    683  1.1    mrg and function declarations in the original program.  The warnings should
    684  1.1    mrg not prevent the linker from producing a correct library or runnable
    685  1.1    mrg executable.
    686  1.1    mrg 
    687  1.1    mrg    <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    688  1.1    mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    689  1.1    mrg to parse archive libraries did not handle the new format correctly. 
    690  1.1    mrg These routines are used by GCC and result in error messages during
    691  1.1    mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    692  1.1    mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp><span class="option">-g</span></samp>
    693  1.1    mrg option of the archive command may be used to create archives of 32-bit
    694  1.1    mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    695  1.1    mrg routines is shipped with AIX 4.3.2 and above.
    696  1.1    mrg 
    697  1.1    mrg    <p>Some versions of the AIX binder (linker) can fail with a relocation
    698  1.1    mrg overflow severe error when the <samp><span class="option">-bbigtoc</span></samp> option is used to link
    699  1.1    mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    700  1.1    mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    701  1.1    mrg available from IBM Customer Support and from its
    702  1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    703  1.1    mrg website as PTF U455193.
    704  1.1    mrg 
    705  1.1    mrg    <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    706  1.1    mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    707  1.1    mrg APAR IX87327 is available from IBM Customer Support and from its
    708  1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    709  1.1    mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    710  1.1    mrg 
    711  1.1    mrg    <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    712  1.1    mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    713  1.1    mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    714  1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    715  1.1    mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    716  1.1    mrg 
    717  1.1    mrg    <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    718  1.1    mrg use NLS to support locale-specific representations of various data
    719  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
    720  1.1    mrg separating decimal fractions).  There have been problems reported where
    721  1.1    mrg GCC does not produce the same floating-point formats that the assembler
    722  1.1    mrg expects.  If one encounters this problem, set the <samp><span class="env">LANG</span></samp>
    723  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;.
    724  1.1    mrg 
    725  1.1    mrg    <p>A default can be specified with the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    726  1.1    mrg switch and using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    727  1.1    mrg 
    728  1.1    mrg    <p><hr />
    729  1.1    mrg 
    730  1.3  skrll <h3 class="heading"><a name="TOC22"></a><a name="iq2000_002dx_002delf"></a>iq2000-*-elf</h3>
    731  1.1    mrg 
    732  1.1    mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    733  1.1    mrg applications.  There are no standard Unix configurations.
    734  1.1    mrg 
    735  1.1    mrg    <p><hr />
    736  1.1    mrg 
    737  1.3  skrll <h3 class="heading"><a name="TOC23"></a><a name="lm32_002dx_002delf"></a>lm32-*-elf</h3>
    738  1.1    mrg 
    739  1.1    mrg <p>Lattice Mico32 processor. 
    740  1.1    mrg This configuration is intended for embedded systems.
    741  1.1    mrg 
    742  1.1    mrg    <p><hr />
    743  1.1    mrg 
    744  1.3  skrll <h3 class="heading"><a name="TOC24"></a><a name="lm32_002dx_002duclinux"></a>lm32-*-uclinux</h3>
    745  1.1    mrg 
    746  1.1    mrg <p>Lattice Mico32 processor. 
    747  1.1    mrg This configuration is intended for embedded systems running uClinux.
    748  1.1    mrg 
    749  1.1    mrg    <p><hr />
    750  1.1    mrg 
    751  1.3  skrll <h3 class="heading"><a name="TOC25"></a><a name="m32c_002dx_002delf"></a>m32c-*-elf</h3>
    752  1.1    mrg 
    753  1.1    mrg <p>Renesas M32C processor. 
    754  1.1    mrg This configuration is intended for embedded systems.
    755  1.1    mrg 
    756  1.1    mrg    <p><hr />
    757  1.1    mrg 
    758  1.3  skrll <h3 class="heading"><a name="TOC26"></a><a name="m32r_002dx_002delf"></a>m32r-*-elf</h3>
    759  1.1    mrg 
    760  1.1    mrg <p>Renesas M32R processor. 
    761  1.1    mrg This configuration is intended for embedded systems.
    762  1.1    mrg 
    763  1.1    mrg    <p><hr />
    764  1.1    mrg 
    765  1.3  skrll <h3 class="heading"><a name="TOC27"></a><a name="m68k_002dx_002dx"></a>m68k-*-*</h3>
    766  1.1    mrg 
    767  1.1    mrg <p>By default,
    768  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
    769  1.1    mrg &lsquo;<samp><span class="samp">m68k-*-linux</span></samp>&rsquo;
    770  1.1    mrg build libraries for both M680x0 and ColdFire processors.  If you only
    771  1.1    mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    772  1.1    mrg <samp><span class="option">--with-arch=m68k</span></samp> to <samp><span class="command">configure</span></samp>.  Alternatively, you
    773  1.1    mrg can omit the M680x0 libraries by passing <samp><span class="option">--with-arch=cf</span></samp> to
    774  1.1    mrg <samp><span class="command">configure</span></samp>.  These targets default to 5206 or 5475 code as
    775  1.1    mrg appropriate for the target system when
    776  1.1    mrg configured with <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    777  1.1    mrg 
    778  1.1    mrg    <p>The &lsquo;<samp><span class="samp">m68k-*-netbsd</span></samp>&rsquo; and
    779  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>
    780  1.1    mrg option.  They will generate ColdFire CFV4e code when configured with
    781  1.1    mrg <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    782  1.1    mrg 
    783  1.1    mrg    <p>You can override the default processors listed above by configuring
    784  1.1    mrg with <samp><span class="option">--with-cpu=</span><var>target</var></samp>.  This <var>target</var> can either
    785  1.1    mrg be a <samp><span class="option">-mcpu</span></samp> argument or one of the following values:
    786  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;,
    787  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;.
    788  1.1    mrg 
    789  1.3  skrll    <p>GCC requires at least binutils version 2.17 on these targets.
    790  1.3  skrll 
    791  1.1    mrg    <p><hr />
    792  1.1    mrg 
    793  1.3  skrll <h3 class="heading"><a name="TOC28"></a><a name="m68k_002dx_002duclinux"></a>m68k-*-uclinux</h3>
    794  1.1    mrg 
    795  1.1    mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    796  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. 
    797  1.1    mrg It also added improved support for C++ and flat shared libraries,
    798  1.3  skrll both of which were ABI changes.
    799  1.1    mrg 
    800  1.1    mrg    <p><hr />
    801  1.1    mrg 
    802  1.3  skrll <h3 class="heading"><a name="TOC29"></a><a name="mep_002dx_002delf"></a>mep-*-elf</h3>
    803  1.1    mrg 
    804  1.1    mrg <p>Toshiba Media embedded Processor. 
    805  1.1    mrg This configuration is intended for embedded systems.
    806  1.1    mrg 
    807  1.1    mrg    <p><hr />
    808  1.1    mrg 
    809  1.3  skrll <h3 class="heading"><a name="TOC30"></a><a name="microblaze_002dx_002delf"></a>microblaze-*-elf</h3>
    810  1.3  skrll 
    811  1.3  skrll <p>Xilinx MicroBlaze processor. 
    812  1.3  skrll This configuration is intended for embedded systems.
    813  1.3  skrll 
    814  1.3  skrll    <p><hr />
    815  1.3  skrll 
    816  1.1    mrg <h3 class="heading"><a name="TOC31"></a><a name="mips_002dx_002dx"></a>mips-*-*</h3>
    817  1.1    mrg 
    818  1.1    mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    819  1.1    mrg sections for all it's [sic] sectons [sic]&rdquo;, don't worry about it.  This
    820  1.1    mrg happens whenever you use GAS with the MIPS linker, but there is not
    821  1.1    mrg really anything wrong, and it is okay to use the output file.  You can
    822  1.1    mrg stop such warnings by installing the GNU linker.
    823  1.1    mrg 
    824  1.1    mrg    <p>It would be nice to extend GAS to produce the gp tables, but they are
    825  1.1    mrg optional, and there should not be a warning about their absence.
    826  1.1    mrg 
    827  1.1    mrg    <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    828  1.1    mrg and later.  A patch went in just after the GCC 3.3 release to
    829  1.1    mrg make &lsquo;<samp><span class="samp">mips*-*-*</span></samp>&rsquo; use the generic implementation instead.  You can also
    830  1.1    mrg configure for &lsquo;<samp><span class="samp">mipsel-elf</span></samp>&rsquo; as a workaround.  The
    831  1.1    mrg &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; target continues to use the MIPS II routines.  More
    832  1.1    mrg work on this is expected in future releases.
    833  1.1    mrg 
    834  1.1    mrg <!-- If you make -with-llsc the default for another target, please also -->
    835  1.1    mrg <!-- update the description of the -with-llsc option. -->
    836  1.1    mrg    <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    837  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
    838  1.1    mrg &lsquo;<samp><span class="samp">sync</span></samp>&rsquo; instructions.  This can be overridden by passing
    839  1.1    mrg <samp><span class="option">--with-llsc</span></samp> or <samp><span class="option">--without-llsc</span></samp> when configuring GCC. 
    840  1.1    mrg Since the Linux kernel emulates these instructions if they are
    841  1.1    mrg missing, the default for &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; targets is
    842  1.1    mrg <samp><span class="option">--with-llsc</span></samp>.  The <samp><span class="option">--with-llsc</span></samp> and
    843  1.1    mrg <samp><span class="option">--without-llsc</span></samp> configure options may be overridden at compile
    844  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
    845  1.1    mrg the compiler.
    846  1.1    mrg 
    847  1.1    mrg    <p>MIPS systems check for division by zero (unless
    848  1.1    mrg <samp><span class="option">-mno-check-zero-division</span></samp> is passed to the compiler) by
    849  1.1    mrg generating either a conditional trap or a break instruction.  Using
    850  1.1    mrg trap results in smaller code, but is only supported on MIPS II and
    851  1.1    mrg later.  Also, some versions of the Linux kernel have a bug that
    852  1.1    mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    853  1.1    mrg the use of break, use the <samp><span class="option">--with-divide=breaks</span></samp>
    854  1.1    mrg <samp><span class="command">configure</span></samp> option when configuring GCC.  The default is to
    855  1.1    mrg use traps on systems that support them.
    856  1.1    mrg 
    857  1.1    mrg    <p>The assembler from GNU binutils 2.17 and earlier has a bug in the way
    858  1.1    mrg it sorts relocations for REL targets (o32, o64, EABI).  This can cause
    859  1.1    mrg bad code to be generated for simple C++ programs.  Also the linker
    860  1.1    mrg from GNU binutils versions prior to 2.17 has a bug which causes the
    861  1.1    mrg runtime linker stubs in very large programs, like <samp><span class="file">libgcj.so</span></samp>, to
    862  1.1    mrg be incorrectly generated.  GNU Binutils 2.18 and later (and snapshots
    863  1.1    mrg made after Nov. 9, 2006) should be free from both of these problems.
    864  1.1    mrg 
    865  1.1    mrg    <p><hr />
    866  1.1    mrg 
    867  1.1    mrg <h3 class="heading"><a name="TOC32"></a><a name="mips_002dsgi_002dirix5"></a>mips-sgi-irix5</h3>
    868  1.1    mrg 
    869  1.3  skrll <p>Support for IRIX 5 has been removed in GCC 4.6.
    870  1.1    mrg 
    871  1.1    mrg    <p><hr />
    872  1.1    mrg 
    873  1.1    mrg <h3 class="heading"><a name="TOC33"></a><a name="mips_002dsgi_002dirix6"></a>mips-sgi-irix6</h3>
    874  1.1    mrg 
    875  1.3  skrll <p>Support for IRIX 6.5 has been removed in GCC 4.8.  Support for IRIX 6
    876  1.3  skrll releases before 6.5 has been removed in GCC 4.6, as well as support for
    877  1.3  skrll the O32 ABI.
    878  1.1    mrg 
    879  1.1    mrg    <p><hr />
    880  1.1    mrg 
    881  1.1    mrg <h3 class="heading"><a name="TOC34"></a><a name="moxie_002dx_002delf"></a>moxie-*-elf</h3>
    882  1.1    mrg 
    883  1.3  skrll <p>The moxie processor.
    884  1.1    mrg 
    885  1.1    mrg    <p><hr />
    886  1.1    mrg 
    887  1.1    mrg <h3 class="heading"><a name="TOC35"></a><a name="powerpc_002dx_002dx"></a>powerpc-*-*</h3>
    888  1.1    mrg 
    889  1.1    mrg <p>You can specify a default version for the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    890  1.1    mrg switch by using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    891  1.1    mrg 
    892  1.1    mrg    <p>You will need
    893  1.1    mrg <a href="ftp://ftp.kernel.org/pub/linux/devel/binutils">binutils 2.15</a>
    894  1.1    mrg or newer for a working GCC.
    895  1.1    mrg 
    896  1.1    mrg    <p><hr />
    897  1.1    mrg 
    898  1.1    mrg <h3 class="heading"><a name="TOC36"></a><a name="powerpc_002dx_002ddarwin"></a>powerpc-*-darwin*</h3>
    899  1.1    mrg 
    900  1.1    mrg <p>PowerPC running Darwin (Mac OS X kernel).
    901  1.1    mrg 
    902  1.1    mrg    <p>Pre-installed versions of Mac OS X may not include any developer tools,
    903  1.1    mrg meaning that you will not be able to build GCC from source.  Tool
    904  1.1    mrg binaries are available at
    905  1.3  skrll <a href="http://opensource.apple.com/">http://opensource.apple.com/</a>.
    906  1.1    mrg 
    907  1.1    mrg    <p>This version of GCC requires at least cctools-590.36.  The
    908  1.1    mrg cctools-590.36 package referenced from
    909  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
    910  1.1    mrg on systems older than 10.3.9 (aka darwin7.9.0).
    911  1.1    mrg 
    912  1.1    mrg    <p><hr />
    913  1.1    mrg 
    914  1.1    mrg <h3 class="heading"><a name="TOC37"></a><a name="powerpc_002dx_002delf"></a>powerpc-*-elf</h3>
    915  1.1    mrg 
    916  1.1    mrg <p>PowerPC system in big endian mode, running System V.4.
    917  1.1    mrg 
    918  1.1    mrg    <p><hr />
    919  1.1    mrg 
    920  1.1    mrg <h3 class="heading"><a name="TOC38"></a><a name="powerpc_002dx_002dlinux_002dgnu"></a>powerpc*-*-linux-gnu*</h3>
    921  1.1    mrg 
    922  1.1    mrg <p>PowerPC system in big endian mode running Linux.
    923  1.1    mrg 
    924  1.1    mrg    <p><hr />
    925  1.1    mrg 
    926  1.1    mrg <h3 class="heading"><a name="TOC39"></a><a name="powerpc_002dx_002dnetbsd"></a>powerpc-*-netbsd*</h3>
    927  1.1    mrg 
    928  1.1    mrg <p>PowerPC system in big endian mode running NetBSD.
    929  1.1    mrg 
    930  1.1    mrg    <p><hr />
    931  1.1    mrg 
    932  1.1    mrg <h3 class="heading"><a name="TOC40"></a><a name="powerpc_002dx_002deabisim"></a>powerpc-*-eabisim</h3>
    933  1.1    mrg 
    934  1.1    mrg <p>Embedded PowerPC system in big endian mode for use in running under the
    935  1.1    mrg PSIM simulator.
    936  1.1    mrg 
    937  1.1    mrg    <p><hr />
    938  1.1    mrg 
    939  1.1    mrg <h3 class="heading"><a name="TOC41"></a><a name="powerpc_002dx_002deabi"></a>powerpc-*-eabi</h3>
    940  1.1    mrg 
    941  1.1    mrg <p>Embedded PowerPC system in big endian mode.
    942  1.1    mrg 
    943  1.1    mrg    <p><hr />
    944  1.1    mrg 
    945  1.1    mrg <h3 class="heading"><a name="TOC42"></a><a name="powerpcle_002dx_002delf"></a>powerpcle-*-elf</h3>
    946  1.1    mrg 
    947  1.1    mrg <p>PowerPC system in little endian mode, running System V.4.
    948  1.1    mrg 
    949  1.1    mrg    <p><hr />
    950  1.1    mrg 
    951  1.1    mrg <h3 class="heading"><a name="TOC43"></a><a name="powerpcle_002dx_002deabisim"></a>powerpcle-*-eabisim</h3>
    952  1.1    mrg 
    953  1.1    mrg <p>Embedded PowerPC system in little endian mode for use in running under
    954  1.1    mrg the PSIM simulator.
    955  1.1    mrg 
    956  1.1    mrg    <p><hr />
    957  1.1    mrg 
    958  1.1    mrg <h3 class="heading"><a name="TOC44"></a><a name="powerpcle_002dx_002deabi"></a>powerpcle-*-eabi</h3>
    959  1.1    mrg 
    960  1.1    mrg <p>Embedded PowerPC system in little endian mode.
    961  1.1    mrg 
    962  1.1    mrg    <p><hr />
    963  1.1    mrg 
    964  1.3  skrll <h3 class="heading"><a name="TOC45"></a><a name="rl78_002dx_002delf"></a>rl78-*-elf</h3>
    965  1.3  skrll 
    966  1.3  skrll <p>The Renesas RL78 processor. 
    967  1.3  skrll This configuration is intended for embedded systems.
    968  1.3  skrll 
    969  1.3  skrll    <p><hr />
    970  1.3  skrll 
    971  1.3  skrll <h3 class="heading"><a name="TOC46"></a><a name="rx_002dx_002delf"></a>rx-*-elf</h3>
    972  1.1    mrg 
    973  1.1    mrg <p>The Renesas RX processor.  See
    974  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>
    975  1.1    mrg for more information about this processor.
    976  1.1    mrg 
    977  1.1    mrg    <p><hr />
    978  1.1    mrg 
    979  1.3  skrll <h3 class="heading"><a name="TOC47"></a><a name="s390_002dx_002dlinux"></a>s390-*-linux*</h3>
    980  1.1    mrg 
    981  1.1    mrg <p>S/390 system running GNU/Linux for S/390.
    982  1.1    mrg 
    983  1.1    mrg    <p><hr />
    984  1.1    mrg 
    985  1.3  skrll <h3 class="heading"><a name="TOC48"></a><a name="s390x_002dx_002dlinux"></a>s390x-*-linux*</h3>
    986  1.1    mrg 
    987  1.1    mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
    988  1.1    mrg 
    989  1.1    mrg    <p><hr />
    990  1.1    mrg 
    991  1.3  skrll <h3 class="heading"><a name="TOC49"></a><a name="s390x_002dibm_002dtpf"></a>s390x-ibm-tpf*</h3>
    992  1.1    mrg 
    993  1.1    mrg <p>zSeries system (64-bit) running TPF.  This platform is
    994  1.1    mrg supported as cross-compilation target only.
    995  1.1    mrg 
    996  1.1    mrg    <p><hr /><!-- Please use Solaris 2 to refer to all release of Solaris, starting -->
    997  1.1    mrg <!-- with 2.0 until 2.6, 7, 8, etc.  Solaris 1 was a marketing name for -->
    998  1.1    mrg <!-- SunOS 4 releases which we don't use to avoid confusion.  Solaris -->
    999  1.1    mrg <!-- alone is too unspecific and must be avoided. -->
   1000  1.1    mrg 
   1001  1.3  skrll <h3 class="heading"><a name="TOC50"></a><a name="x_002dx_002dsolaris2"></a>*-*-solaris2*</h3>
   1002  1.3  skrll 
   1003  1.3  skrll <p>Support for Solaris 8 has removed in GCC 4.8.  Support for Solaris 7 has
   1004  1.3  skrll been removed in GCC 4.6.
   1005  1.1    mrg 
   1006  1.3  skrll    <p>Sun does not ship a C compiler with Solaris 2 before Solaris 10, though
   1007  1.3  skrll you can download the Sun Studio compilers for free.  In Solaris 10 and
   1008  1.3  skrll 11, GCC 3.4.3 is available as <samp><span class="command">/usr/sfw/bin/gcc</span></samp>.  Solaris 11
   1009  1.3  skrll also provides GCC 4.5.2 as <samp><span class="command">/usr/gcc/4.5/bin/gcc</span></samp>.  Alternatively,
   1010  1.1    mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1011  1.1    mrg <a href="binaries.html">binaries page</a> for details.
   1012  1.1    mrg 
   1013  1.1    mrg    <p>The Solaris 2 <samp><span class="command">/bin/sh</span></samp> will often fail to configure
   1014  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
   1015  1.1    mrg recommend using the following initial sequence of commands
   1016  1.1    mrg 
   1017  1.3  skrll <pre class="smallexample">     % CONFIG_SHELL=/bin/ksh
   1018  1.3  skrll      % export CONFIG_SHELL
   1019  1.1    mrg </pre>
   1020  1.1    mrg    <p class="noindent">and proceed as described in <a href="configure.html">the configure instructions</a>. 
   1021  1.1    mrg In addition we strongly recommend specifying an absolute path to invoke
   1022  1.1    mrg <samp><var>srcdir</var><span class="command">/configure</span></samp>.
   1023  1.1    mrg 
   1024  1.1    mrg    <p>Solaris 2 comes with a number of optional OS packages.  Some of these
   1025  1.1    mrg are needed to use GCC fully, namely <code>SUNWarc</code>,
   1026  1.1    mrg <code>SUNWbtool</code>, <code>SUNWesu</code>, <code>SUNWhea</code>, <code>SUNWlibm</code>,
   1027  1.1    mrg <code>SUNWsprot</code>, and <code>SUNWtoo</code>.  If you did not install all
   1028  1.1    mrg optional packages when installing Solaris 2, you will need to verify that
   1029  1.1    mrg the packages that GCC needs are installed.
   1030  1.1    mrg 
   1031  1.1    mrg    <p>To check whether an optional package is installed, use
   1032  1.1    mrg the <samp><span class="command">pkginfo</span></samp> command.  To add an optional package, use the
   1033  1.1    mrg <samp><span class="command">pkgadd</span></samp> command.  For further details, see the Solaris 2
   1034  1.1    mrg documentation.
   1035  1.1    mrg 
   1036  1.1    mrg    <p>Trying to use the linker and other tools in
   1037  1.1    mrg <samp><span class="file">/usr/ucb</span></samp> to install GCC has been observed to cause trouble. 
   1038  1.1    mrg For example, the linker may hang indefinitely.  The fix is to remove
   1039  1.1    mrg <samp><span class="file">/usr/ucb</span></samp> from your <samp><span class="env">PATH</span></samp>.
   1040  1.1    mrg 
   1041  1.1    mrg    <p>The build process works more smoothly with the legacy Sun tools so, if you
   1042  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
   1043  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.
   1044  1.1    mrg 
   1045  1.1    mrg    <p>We recommend the use of the Sun assembler or the GNU assembler, in
   1046  1.1    mrg conjunction with the Sun linker.  The GNU <samp><span class="command">as</span></samp>
   1047  1.1    mrg versions included in Solaris 10, from GNU binutils 2.15, and Solaris 11,
   1048  1.1    mrg from GNU binutils 2.19, are known to work.  They can be found in
   1049  1.3  skrll <samp><span class="file">/usr/sfw/bin/gas</span></samp>.  Current versions of GNU binutils (2.22)
   1050  1.1    mrg are known to work as well.  Note that your mileage may vary
   1051  1.1    mrg if you use a combination of the GNU tools and the Sun tools: while the
   1052  1.1    mrg combination GNU <samp><span class="command">as</span></samp> + Sun <samp><span class="command">ld</span></samp> should reasonably work,
   1053  1.3  skrll the reverse combination Sun <samp><span class="command">as</span></samp> + GNU <samp><span class="command">ld</span></samp> may fail to
   1054  1.3  skrll build or cause memory corruption at runtime in some cases for C++ programs. 
   1055  1.1    mrg <!-- FIXME: still? -->
   1056  1.1    mrg GNU <samp><span class="command">ld</span></samp> usually works as well, although the version included in
   1057  1.1    mrg Solaris 10 cannot be used due to several bugs.  Again, the current
   1058  1.3  skrll version (2.22) is known to work, but generally lacks platform specific
   1059  1.3  skrll features, so better stay with Sun <samp><span class="command">ld</span></samp>.  To use the LTO linker
   1060  1.3  skrll plugin (<samp><span class="option">-fuse-linker-plugin</span></samp>) with GNU <samp><span class="command">ld</span></samp>, GNU
   1061  1.3  skrll binutils <em>must</em> be configured with <samp><span class="option">--enable-largefile</span></samp>.
   1062  1.3  skrll 
   1063  1.3  skrll    <p>To enable symbol versioning in &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; with Sun <samp><span class="command">ld</span></samp>,
   1064  1.3  skrll you need to have any version of GNU <samp><span class="command">c++filt</span></samp>, which is part of
   1065  1.3  skrll GNU binutils.  &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; symbol versioning will be disabled if no
   1066  1.3  skrll appropriate version is found.  Sun <samp><span class="command">c++filt</span></samp> from the Sun Studio
   1067  1.3  skrll compilers does <em>not</em> work.
   1068  1.1    mrg 
   1069  1.1    mrg    <p>Sun bug 4296832 turns up when compiling X11 headers with GCC 2.95 or
   1070  1.1    mrg newer: <samp><span class="command">g++</span></samp> will complain that types are missing.  These headers
   1071  1.1    mrg assume that omitting the type means <code>int</code>; this assumption worked for
   1072  1.1    mrg C90 but is wrong for C++, and is now wrong for C99 also.
   1073  1.1    mrg 
   1074  1.1    mrg    <p>Sun bug 4927647 sometimes causes random spurious testsuite failures
   1075  1.1    mrg related to missing diagnostic output.  This bug doesn't affect GCC
   1076  1.1    mrg itself, rather it is a kernel bug triggered by the <samp><span class="command">expect</span></samp>
   1077  1.1    mrg program which is used only by the GCC testsuite driver.  When the bug
   1078  1.1    mrg causes the <samp><span class="command">expect</span></samp> program to miss anticipated output, extra
   1079  1.1    mrg testsuite failures appear.
   1080  1.1    mrg 
   1081  1.3  skrll    <p>There are patches for Solaris 9 (117171-11 or newer for
   1082  1.1    mrg SPARC, 117172-11 or newer for Intel) that address this problem.
   1083  1.1    mrg 
   1084  1.3  skrll    <p>Thread-local storage (TLS) is supported in Solaris&nbsp;9, but requires
   1085  1.3  skrll some patches.  The &lsquo;<samp><span class="samp">libthread</span></samp>&rsquo; patches provide the
   1086  1.3  skrll <code>__tls_get_addr</code> (SPARC, 64-bit x86) resp. <code>___tls_get_addr</code>
   1087  1.3  skrll (32-bit x86) functions.  On Solaris&nbsp;9, the necessary support
   1088  1.3  skrll on SPARC is present since FCS, while 114432-05 or newer is required on
   1089  1.3  skrll Intel.  Additionally, on Solaris&nbsp;9/x86, patch 113986-02 or newer is
   1090  1.3  skrll required for the Sun <samp><span class="command">ld</span></samp> and runtime linker (<samp><span class="command">ld.so.1</span></samp>)
   1091  1.3  skrll support, while Solaris&nbsp;9/SPARC works since FCS.  The linker
   1092  1.3  skrll patches must be installed even if GNU <samp><span class="command">ld</span></samp> is used. Sun
   1093  1.3  skrll <samp><span class="command">as</span></samp> in Solaris&nbsp;9 doesn't support the necessary
   1094  1.3  skrll relocations, so GNU <samp><span class="command">as</span></samp> must be used.  The <samp><span class="command">configure</span></samp>
   1095  1.3  skrll script checks for those prerequisites and automatically enables TLS
   1096  1.3  skrll support if they are met.  Although those minimal patch versions should
   1097  1.3  skrll work, it is recommended to use the latest patch versions which include
   1098  1.3  skrll additional bug fixes.
   1099  1.3  skrll 
   1100  1.3  skrll    <p><hr />
   1101  1.3  skrll 
   1102  1.3  skrll <h3 class="heading"><a name="TOC51"></a><a name="sparc_002dx_002dx"></a>sparc*-*-*</h3>
   1103  1.3  skrll 
   1104  1.3  skrll <p>This section contains general configuration information for all
   1105  1.3  skrll SPARC-based platforms.  In addition to reading this section, please
   1106  1.3  skrll read all other sections that match your target.
   1107  1.3  skrll 
   1108  1.3  skrll    <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1109  1.3  skrll library and the MPC library are known to be miscompiled by earlier
   1110  1.3  skrll versions of GCC on these platforms.  We therefore recommend the use
   1111  1.3  skrll of the exact versions of these libraries listed as minimal versions
   1112  1.3  skrll in <a href="prerequisites.html">the prerequisites</a>.
   1113  1.3  skrll 
   1114  1.1    mrg    <p><hr />
   1115  1.1    mrg 
   1116  1.3  skrll <h3 class="heading"><a name="TOC52"></a><a name="sparc_002dsun_002dsolaris2"></a>sparc-sun-solaris2*</h3>
   1117  1.1    mrg 
   1118  1.1    mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1119  1.1    mrg produced are smaller than the ones produced using Sun's native tools;
   1120  1.1    mrg this difference is quite significant for binaries containing debugging
   1121  1.1    mrg information.
   1122  1.1    mrg 
   1123  1.1    mrg    <p>Starting with Solaris 7, the operating system is capable of executing
   1124  1.1    mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1125  1.1    mrg this; the <samp><span class="option">-m64</span></samp> option enables 64-bit code generation. 
   1126  1.1    mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1127  1.1    mrg should try the <samp><span class="option">-mtune=ultrasparc</span></samp> option instead, which produces
   1128  1.1    mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1129  1.1    mrg machines.
   1130  1.1    mrg 
   1131  1.1    mrg    <p>When configuring on a Solaris 7 or later system that is running a kernel
   1132  1.1    mrg that supports only 32-bit binaries, one must configure with
   1133  1.1    mrg <samp><span class="option">--disable-multilib</span></samp>, since we will not be able to build the
   1134  1.1    mrg 64-bit target libraries.
   1135  1.1    mrg 
   1136  1.1    mrg    <p>GCC 3.3 and GCC 3.4 trigger code generation bugs in earlier versions of
   1137  1.1    mrg the GNU compiler (especially GCC 3.0.x versions), which lead to the
   1138  1.1    mrg miscompilation of the stage1 compiler and the subsequent failure of the
   1139  1.1    mrg bootstrap process.  A workaround is to use GCC 3.2.3 as an intermediary
   1140  1.1    mrg stage, i.e. to bootstrap that compiler with the base compiler and then
   1141  1.1    mrg use it to bootstrap the final compiler.
   1142  1.1    mrg 
   1143  1.1    mrg    <p>GCC 3.4 triggers a code generation bug in versions 5.4 (Sun ONE Studio 7)
   1144  1.1    mrg and 5.5 (Sun ONE Studio 8) of the Sun compiler, which causes a bootstrap
   1145  1.1    mrg failure in form of a miscompilation of the stage1 compiler by the Sun
   1146  1.1    mrg compiler.  This is Sun bug 4974440.  This is fixed with patch 112760-07.
   1147  1.1    mrg 
   1148  1.1    mrg    <p>GCC 3.4 changed the default debugging format from Stabs to DWARF-2 for
   1149  1.1    mrg 32-bit code on Solaris 7 and later.  If you use the Sun assembler, this
   1150  1.1    mrg change apparently runs afoul of Sun bug 4910101 (which is referenced as
   1151  1.1    mrg an x86-only problem by Sun, probably because they do not use DWARF-2). 
   1152  1.1    mrg A symptom of the problem is that you cannot compile C++ programs like
   1153  1.1    mrg <samp><span class="command">groff</span></samp> 1.19.1 without getting messages similar to the following:
   1154  1.1    mrg 
   1155  1.1    mrg <pre class="smallexample">     ld: warning: relocation error: R_SPARC_UA32: ...
   1156  1.1    mrg        external symbolic relocation against non-allocatable section
   1157  1.1    mrg        .debug_info cannot be processed at runtime: relocation ignored.
   1158  1.1    mrg </pre>
   1159  1.1    mrg    <p class="noindent">To work around this problem, compile with <samp><span class="option">-gstabs+</span></samp> instead of
   1160  1.1    mrg plain <samp><span class="option">-g</span></samp>.
   1161  1.1    mrg 
   1162  1.3  skrll    <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1163  1.3  skrll library or the MPC library on a Solaris 7 or later system, the canonical
   1164  1.3  skrll target triplet must be specified as the <samp><span class="command">build</span></samp> parameter on the
   1165  1.3  skrll configure line.  This target triplet can be obtained by invoking <samp><span class="command">./config.guess</span></samp> in the toplevel source directory of GCC (and
   1166  1.3  skrll not that of GMP or MPFR or MPC).  For example on a Solaris 9 system:
   1167  1.1    mrg 
   1168  1.3  skrll <pre class="smallexample">     % ./configure --build=sparc-sun-solaris2.9 --prefix=xxx
   1169  1.1    mrg </pre>
   1170  1.1    mrg    <p><hr />
   1171  1.1    mrg 
   1172  1.3  skrll <h3 class="heading"><a name="TOC53"></a><a name="sparc_002dsun_002dsolaris210"></a>sparc-sun-solaris2.10</h3>
   1173  1.1    mrg 
   1174  1.1    mrg <p>There is a bug in older versions of the Sun assembler which breaks
   1175  1.1    mrg thread-local storage (TLS).  A typical error message is
   1176  1.1    mrg 
   1177  1.1    mrg <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_TLS_LE_HIX22: file /var/tmp//ccamPA1v.o:
   1178  1.1    mrg        symbol &lt;unknown&gt;: bad symbol type SECT: symbol type must be TLS
   1179  1.1    mrg </pre>
   1180  1.1    mrg    <p class="noindent">This bug is fixed in Sun patch 118683-03 or later.
   1181  1.1    mrg 
   1182  1.1    mrg    <p><hr />
   1183  1.1    mrg 
   1184  1.3  skrll <h3 class="heading"><a name="TOC54"></a><a name="sparc_002dx_002dlinux"></a>sparc-*-linux*</h3>
   1185  1.1    mrg 
   1186  1.1    mrg <p>GCC versions 3.0 and higher require binutils 2.11.2 and glibc 2.2.4
   1187  1.1    mrg or newer on this platform.  All earlier binutils and glibc
   1188  1.1    mrg releases mishandled unaligned relocations on <code>sparc-*-*</code> targets.
   1189  1.1    mrg 
   1190  1.1    mrg    <p><hr />
   1191  1.1    mrg 
   1192  1.3  skrll <h3 class="heading"><a name="TOC55"></a><a name="sparc64_002dx_002dsolaris2"></a>sparc64-*-solaris2*</h3>
   1193  1.1    mrg 
   1194  1.3  skrll <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1195  1.3  skrll library or the MPC library, the canonical target triplet must be specified
   1196  1.3  skrll as the <samp><span class="command">build</span></samp> parameter on the configure line.  For example
   1197  1.3  skrll on a Solaris 9 system:
   1198  1.1    mrg 
   1199  1.3  skrll <pre class="smallexample">     % ./configure --build=sparc64-sun-solaris2.9 --prefix=xxx
   1200  1.1    mrg </pre>
   1201  1.1    mrg    <p>The following compiler flags must be specified in the configure
   1202  1.1    mrg step in order to bootstrap this target with the Sun compiler:
   1203  1.1    mrg 
   1204  1.3  skrll <pre class="smallexample">     % CC="cc -xarch=v9 -xildoff" <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>]
   1205  1.1    mrg </pre>
   1206  1.1    mrg    <p class="noindent"><samp><span class="option">-xarch=v9</span></samp> specifies the SPARC-V9 architecture to the Sun toolchain
   1207  1.1    mrg and <samp><span class="option">-xildoff</span></samp> turns off the incremental linker.
   1208  1.1    mrg 
   1209  1.1    mrg    <p><hr />
   1210  1.1    mrg 
   1211  1.3  skrll <h3 class="heading"><a name="TOC56"></a><a name="sparcv9_002dx_002dsolaris2"></a>sparcv9-*-solaris2*</h3>
   1212  1.1    mrg 
   1213  1.1    mrg <p>This is a synonym for &lsquo;<samp><span class="samp">sparc64-*-solaris2*</span></samp>&rsquo;.
   1214  1.1    mrg 
   1215  1.1    mrg    <p><hr />
   1216  1.1    mrg 
   1217  1.3  skrll <h3 class="heading"><a name="TOC57"></a><a name="c6x_002dx_002dx"></a>c6x-*-*</h3>
   1218  1.3  skrll 
   1219  1.3  skrll <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1220  1.3  skrll 
   1221  1.3  skrll    <p><hr />
   1222  1.3  skrll 
   1223  1.3  skrll <h3 class="heading"><a name="TOC58"></a><a name="tilegx_002d_002a_002dlinux"></a>tilegx-*-linux*</h3>
   1224  1.3  skrll 
   1225  1.3  skrll <p>The TILE-Gx processor running GNU/Linux.  This port requires
   1226  1.3  skrll binutils-2.22 or newer.
   1227  1.3  skrll 
   1228  1.3  skrll    <p><hr />
   1229  1.3  skrll 
   1230  1.3  skrll <h3 class="heading"><a name="TOC59"></a><a name="tilepro_002d_002a_002dlinux"></a>tilepro-*-linux*</h3>
   1231  1.3  skrll 
   1232  1.3  skrll <p>The TILEPro processor running GNU/Linux.  This port requires
   1233  1.3  skrll binutils-2.22 or newer.
   1234  1.3  skrll 
   1235  1.3  skrll    <p><hr />
   1236  1.3  skrll 
   1237  1.3  skrll <h3 class="heading"><a name="TOC60"></a><a name="x_002dx_002dvxworks"></a>*-*-vxworks*</h3>
   1238  1.1    mrg 
   1239  1.1    mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1240  1.1    mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC. 
   1241  1.1    mrg We welcome patches for other architectures supported by VxWorks 5.5. 
   1242  1.1    mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1243  1.1    mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1244  1.1    mrg not interested in supporting older, a.out or COFF-based, versions of
   1245  1.1    mrg VxWorks in GCC 3.
   1246  1.1    mrg 
   1247  1.1    mrg    <p>VxWorks comes with an older version of GCC installed in
   1248  1.1    mrg <samp><var>$WIND_BASE</var><span class="file">/host</span></samp>; we recommend you do not overwrite it. 
   1249  1.1    mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>. 
   1250  1.1    mrg Before running <samp><span class="command">configure</span></samp>, create the directories <samp><var>prefix</var></samp>
   1251  1.1    mrg and <samp><var>prefix</var><span class="file">/bin</span></samp>.  Link or copy the appropriate assembler,
   1252  1.1    mrg linker, etc. into <samp><var>prefix</var><span class="file">/bin</span></samp>, and set your <var>PATH</var> to
   1253  1.1    mrg include that directory while running both <samp><span class="command">configure</span></samp> and
   1254  1.1    mrg <samp><span class="command">make</span></samp>.
   1255  1.1    mrg 
   1256  1.1    mrg    <p>You must give <samp><span class="command">configure</span></samp> the
   1257  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
   1258  1.1    mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1259  1.1    mrg target only, you must also specify <samp><span class="option">--target=</span><var>target</var></samp>. 
   1260  1.1    mrg <samp><span class="command">configure</span></samp> will attempt to create the directory
   1261  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;
   1262  1.1    mrg make sure the user running <samp><span class="command">configure</span></samp> has sufficient privilege
   1263  1.1    mrg to do so.
   1264  1.1    mrg 
   1265  1.1    mrg    <p>GCC's exception handling runtime requires a special &ldquo;configlette&rdquo;
   1266  1.1    mrg module, <samp><span class="file">contrib/gthr_supp_vxw_5x.c</span></samp>.  Follow the instructions in
   1267  1.1    mrg that file to add the module to your kernel build.  (Future versions of
   1268  1.1    mrg VxWorks will incorporate this module.)
   1269  1.1    mrg 
   1270  1.1    mrg    <p><hr />
   1271  1.1    mrg 
   1272  1.3  skrll <h3 class="heading"><a name="TOC61"></a><a name="x86_002d64_002dx_002dx"></a>x86_64-*-*, amd64-*-*</h3>
   1273  1.1    mrg 
   1274  1.1    mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1275  1.1    mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD. 
   1276  1.1    mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1277  1.1    mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp><span class="option">-m32</span></samp> switch).
   1278  1.1    mrg 
   1279  1.1    mrg    <p><hr />
   1280  1.1    mrg 
   1281  1.3  skrll <h3 class="heading"><a name="TOC62"></a><a name="x86_002d64_002dx_002dsolaris210"></a>x86_64-*-solaris2.1[0-9]*</h3>
   1282  1.3  skrll 
   1283  1.3  skrll <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1284  1.3  skrll processor (&lsquo;<samp><span class="samp">amd64-*-*</span></samp>&rsquo; is an alias for &lsquo;<samp><span class="samp">x86_64-*-*</span></samp>&rsquo;) on
   1285  1.3  skrll Solaris 10 or later.  Unlike other systems, without special options a
   1286  1.3  skrll bi-arch compiler is built which generates 32-bit code by default, but
   1287  1.3  skrll can generate 64-bit x86-64 code with the <samp><span class="option">-m64</span></samp> switch.  Since
   1288  1.3  skrll GCC 4.7, there is also configuration that defaults to 64-bit code, but
   1289  1.3  skrll can generate 32-bit code with <samp><span class="option">-m32</span></samp>.  To configure and build
   1290  1.3  skrll this way, you have to provide all support libraries like <samp><span class="file">libgmp</span></samp>
   1291  1.3  skrll as 64-bit code, configure with <samp><span class="option">--target=x86_64-pc-solaris2.1x</span></samp>
   1292  1.3  skrll and &lsquo;<samp><span class="samp">CC=gcc -m64</span></samp>&rsquo;.
   1293  1.3  skrll 
   1294  1.3  skrll    <p><hr />
   1295  1.3  skrll 
   1296  1.3  skrll <h3 class="heading"><a name="TOC63"></a><a name="xtensa_002dx_002delf"></a>xtensa*-*-elf</h3>
   1297  1.1    mrg 
   1298  1.1    mrg <p>This target is intended for embedded Xtensa systems using the
   1299  1.1    mrg &lsquo;<samp><span class="samp">newlib</span></samp>&rsquo; C library.  It uses ELF but does not support shared
   1300  1.1    mrg objects.  Designed-defined instructions specified via the
   1301  1.1    mrg Tensilica Instruction Extension (TIE) language are only supported
   1302  1.1    mrg through inline assembly.
   1303  1.1    mrg 
   1304  1.1    mrg    <p>The Xtensa configuration information must be specified prior to
   1305  1.1    mrg building GCC.  The <samp><span class="file">include/xtensa-config.h</span></samp> header
   1306  1.1    mrg file contains the configuration information.  If you created your
   1307  1.1    mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1308  1.1    mrg downloaded files include a customized copy of this header file,
   1309  1.1    mrg which you can use to replace the default header file.
   1310  1.1    mrg 
   1311  1.1    mrg    <p><hr />
   1312  1.1    mrg 
   1313  1.3  skrll <h3 class="heading"><a name="TOC64"></a><a name="xtensa_002dx_002dlinux"></a>xtensa*-*-linux*</h3>
   1314  1.1    mrg 
   1315  1.1    mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1316  1.1    mrg shared objects and the GNU C library (glibc).  It also generates
   1317  1.1    mrg position-independent code (PIC) regardless of whether the
   1318  1.1    mrg <samp><span class="option">-fpic</span></samp> or <samp><span class="option">-fPIC</span></samp> options are used.  In other
   1319  1.1    mrg respects, this target is the same as the
   1320  1.1    mrg <a href="#xtensa*-*-elf">&lsquo;<samp><span class="samp">xtensa*-*-elf</span></samp>&rsquo;</a> target.
   1321  1.1    mrg 
   1322  1.1    mrg    <p><hr />
   1323  1.1    mrg 
   1324  1.3  skrll <h3 class="heading"><a name="TOC65"></a><a name="windows"></a>Microsoft Windows</h3>
   1325  1.1    mrg 
   1326  1.3  skrll <h4 class="subheading"><a name="TOC66"></a>Intel 16-bit versions</h4>
   1327  1.1    mrg 
   1328  1.1    mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1329  1.1    mrg supported.
   1330  1.1    mrg 
   1331  1.1    mrg    <p>However, the 32-bit port has limited support for Microsoft
   1332  1.1    mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1333  1.1    mrg 
   1334  1.3  skrll <h4 class="subheading"><a name="TOC67"></a>Intel 32-bit versions</h4>
   1335  1.1    mrg 
   1336  1.1    mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1337  1.1    mrg XP, and Windows Vista, are supported by several different target
   1338  1.1    mrg platforms.  These targets differ in which Windows subsystem they target
   1339  1.1    mrg and which C libraries are used.
   1340  1.1    mrg 
   1341  1.1    mrg      <ul>
   1342  1.1    mrg <li>Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1343  1.1    mrg Linux API emulation layer in the Win32 subsystem. 
   1344  1.1    mrg <li>Interix <a href="#x-x-interix">*-*-interix</a>: The Interix subsystem
   1345  1.1    mrg provides native support for POSIX. 
   1346  1.1    mrg <li>MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1347  1.1    mrg the Win32 subsystem that provides a subset of POSIX. 
   1348  1.1    mrg <li>MKS i386-pc-mks: NuTCracker from MKS.  See
   1349  1.1    mrg <a href="http://www.mkssoftware.com/">http://www.mkssoftware.com/</a> for more information. 
   1350  1.1    mrg </ul>
   1351  1.1    mrg 
   1352  1.3  skrll <h4 class="subheading"><a name="TOC68"></a>Intel 64-bit versions</h4>
   1353  1.1    mrg 
   1354  1.1    mrg <p>GCC contains support for x86-64 using the mingw-w64
   1355  1.1    mrg runtime library, available from <a href="http://mingw-w64.sourceforge.net/">http://mingw-w64.sourceforge.net/</a>. 
   1356  1.1    mrg This library should be used with the target triple x86_64-pc-mingw32.
   1357  1.1    mrg 
   1358  1.1    mrg    <p>Presently Windows for Itanium is not supported.
   1359  1.1    mrg 
   1360  1.3  skrll <h4 class="subheading"><a name="TOC69"></a>Windows CE</h4>
   1361  1.1    mrg 
   1362  1.3  skrll <p>Windows CE is supported as a target only on Hitachi
   1363  1.1    mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1364  1.1    mrg 
   1365  1.3  skrll <h4 class="subheading"><a name="TOC70"></a>Other Windows Platforms</h4>
   1366  1.1    mrg 
   1367  1.1    mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1368  1.1    mrg 
   1369  1.1    mrg    <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1370  1.1    mrg support the Interix subsystem.  See above.
   1371  1.1    mrg 
   1372  1.1    mrg    <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1373  1.1    mrg 
   1374  1.1    mrg    <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1375  1.1    mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1376  1.1    mrg 
   1377  1.1    mrg    <p>UWIN support has been removed due to a lack of maintenance.
   1378  1.1    mrg 
   1379  1.1    mrg    <p><hr />
   1380  1.1    mrg 
   1381  1.3  skrll <h3 class="heading"><a name="TOC71"></a><a name="x_002dx_002dcygwin"></a>*-*-cygwin</h3>
   1382  1.1    mrg 
   1383  1.1    mrg <p>Ports of GCC are included with the
   1384  1.1    mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1385  1.1    mrg 
   1386  1.1    mrg    <p>GCC will build under Cygwin without modification; it does not build
   1387  1.1    mrg with Microsoft's C++ compiler and there are no plans to make it do so.
   1388  1.1    mrg 
   1389  1.1    mrg    <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1390  1.1    mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1391  1.1    mrg used with as up-to-date a version of binutils as possible; use either
   1392  1.1    mrg the latest official GNU binutils release in the Cygwin distribution,
   1393  1.1    mrg or version 2.20 or above if building your own.
   1394  1.1    mrg 
   1395  1.1    mrg    <p><hr />
   1396  1.1    mrg 
   1397  1.3  skrll <h3 class="heading"><a name="TOC72"></a><a name="x_002dx_002dinterix"></a>*-*-interix</h3>
   1398  1.1    mrg 
   1399  1.1    mrg <p>The Interix target is used by OpenNT, Interix, Services For UNIX (SFU),
   1400  1.1    mrg and Subsystem for UNIX-based Applications (SUA).  Applications compiled
   1401  1.1    mrg with this target run in the Interix subsystem, which is separate from
   1402  1.1    mrg the Win32 subsystem.  This target was last known to work in GCC 3.3.
   1403  1.1    mrg 
   1404  1.1    mrg    <p><hr />
   1405  1.1    mrg 
   1406  1.3  skrll <h3 class="heading"><a name="TOC73"></a><a name="x_002dx_002dmingw32"></a>*-*-mingw32</h3>
   1407  1.1    mrg 
   1408  1.1    mrg <p>GCC will build with and support only MinGW runtime 3.12 and later. 
   1409  1.1    mrg Earlier versions of headers are incompatible with the new default semantics
   1410  1.1    mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1411  1.1    mrg 
   1412  1.1    mrg    <p><hr />
   1413  1.1    mrg 
   1414  1.3  skrll <h3 class="heading"><a name="TOC74"></a><a name="older"></a>Older systems</h3>
   1415  1.1    mrg 
   1416  1.1    mrg <p>GCC contains support files for many older (1980s and early
   1417  1.1    mrg 1990s) Unix variants.  For the most part, support for these systems
   1418  1.1    mrg has not been deliberately removed, but it has not been maintained for
   1419  1.1    mrg several years and may suffer from bitrot.
   1420  1.1    mrg 
   1421  1.1    mrg    <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems. 
   1422  1.1    mrg Support for these systems is still present in that release, but
   1423  1.1    mrg <samp><span class="command">configure</span></samp> will fail unless the <samp><span class="option">--enable-obsolete</span></samp>
   1424  1.1    mrg option is given.  Unless a maintainer steps forward, support for these
   1425  1.1    mrg systems will be removed from the next release of GCC.
   1426  1.1    mrg 
   1427  1.1    mrg    <p>Support for old systems as hosts for GCC can cause problems if the
   1428  1.1    mrg workarounds for compiler, library and operating system bugs affect the
   1429  1.1    mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1430  1.1    mrg bring GCC up on such a system, if still possible with current GCC, may
   1431  1.1    mrg require first installing an old version of GCC which did work on that
   1432  1.1    mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1433  1.1    mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1434  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
   1435  1.1    mrg <samp><span class="command">fixincludes</span></samp>, but bugs or deficiencies in libraries and the
   1436  1.1    mrg operating system may still cause problems.
   1437  1.1    mrg 
   1438  1.1    mrg    <p>Support for older systems as targets for cross-compilation is less
   1439  1.1    mrg problematic than support for them as hosts for GCC; if an enthusiast
   1440  1.1    mrg wishes to make such a target work again (including resurrecting any of
   1441  1.1    mrg the targets that never worked with GCC 2, starting from the last
   1442  1.1    mrg version before they were removed), patches
   1443  1.1    mrg <a href="../contribute.html">following the usual requirements</a> would be
   1444  1.1    mrg likely to be accepted, since they should not affect the support for more
   1445  1.1    mrg modern targets.
   1446  1.1    mrg 
   1447  1.1    mrg    <p>For some systems, old versions of GNU binutils may also be useful,
   1448  1.1    mrg and are available from <samp><span class="file">pub/binutils/old-releases</span></samp> on
   1449  1.1    mrg <a href="http://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1450  1.1    mrg 
   1451  1.1    mrg    <p>Some of the information on specific systems above relates to
   1452  1.1    mrg such older systems, but much of the information
   1453  1.1    mrg about GCC on such systems (which may no longer be applicable to
   1454  1.1    mrg current GCC) is to be found in the GCC texinfo manual.
   1455  1.1    mrg 
   1456  1.1    mrg    <p><hr />
   1457  1.1    mrg 
   1458  1.3  skrll <h3 class="heading"><a name="TOC75"></a><a name="elf"></a>all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1459  1.1    mrg 
   1460  1.1    mrg <p>C++ support is significantly better on ELF targets if you use the
   1461  1.1    mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1462  1.1    mrg inlines, vtables and template instantiations will be discarded
   1463  1.1    mrg automatically.
   1464  1.1    mrg 
   1465  1.1    mrg    <p><hr />
   1466  1.1    mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1467  1.1    mrg 
   1468  1.1    mrg <!-- ***Old documentation****************************************************** -->
   1469  1.1    mrg <!-- ***GFDL******************************************************************** -->
   1470  1.1    mrg <!-- *************************************************************************** -->
   1471  1.1    mrg <!-- Part 6 The End of the Document -->
   1472  1.1    mrg </body></html>
   1473  1.1    mrg 
   1474