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     21  1.10  mrg      A GNU Manual
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     42  1.10  mrg <h1 class="settitle">Host/Target specific installation notes for GCC</h1>
     43  1.10  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  1.10  mrg Please read this document carefully <em>before</em> installing the
     45  1.10  mrg GNU Compiler Collection on your machine.
     46   1.8  mrg 
     47  1.10  mrg    <p>Note that this list of install notes is <em>not</em> a list of supported
     48  1.10  mrg hosts or targets.  Not all supported hosts and targets are listed
     49  1.10  mrg here, only the ones that require host-specific or target-specific
     50  1.10  mrg information have to.
     51   1.8  mrg 
     52  1.10  mrg      <ul>
     53  1.10  mrg <li><a href="#aarch64-x-x">aarch64*-*-*</a>
     54  1.10  mrg <li><a href="#alpha-x-x">alpha*-*-*</a>
     55  1.10  mrg <li><a href="#alpha-dec-osf51">alpha*-dec-osf5.1</a>
     56  1.10  mrg <li><a href="#amd64-x-solaris210">amd64-*-solaris2.10</a>
     57  1.10  mrg <li><a href="#arm-x-eabi">arm-*-eabi</a>
     58  1.10  mrg <li><a href="#avr">avr</a>
     59  1.10  mrg <li><a href="#bfin">Blackfin</a>
     60  1.10  mrg <li><a href="#dos">DOS</a>
     61  1.10  mrg <li><a href="#x-x-freebsd">*-*-freebsd*</a>
     62  1.10  mrg <li><a href="#h8300-hms">h8300-hms</a>
     63  1.10  mrg <li><a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
     64  1.10  mrg <li><a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
     65  1.10  mrg <li><a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
     66  1.10  mrg <li><a href="#x-x-linux-gnu">*-*-linux-gnu</a>
     67  1.10  mrg <li><a href="#ix86-x-linux">i?86-*-linux*</a>
     68  1.10  mrg <li><a href="#ix86-x-solaris210">i?86-*-solaris2.10</a>
     69  1.10  mrg <li><a href="#ia64-x-linux">ia64-*-linux</a>
     70  1.10  mrg <li><a href="#ia64-x-hpux">ia64-*-hpux*</a>
     71  1.10  mrg <li><a href="#x-ibm-aix">*-ibm-aix*</a>
     72  1.10  mrg <li><a href="#iq2000-x-elf">iq2000-*-elf</a>
     73  1.10  mrg <li><a href="#lm32-x-elf">lm32-*-elf</a>
     74  1.10  mrg <li><a href="#lm32-x-uclinux">lm32-*-uclinux</a>
     75  1.10  mrg <li><a href="#m32c-x-elf">m32c-*-elf</a>
     76  1.10  mrg <li><a href="#m32r-x-elf">m32r-*-elf</a>
     77  1.10  mrg <li><a href="#m68k-x-x">m68k-*-*</a>
     78  1.10  mrg <li><a href="#m68k-uclinux">m68k-uclinux</a>
     79  1.10  mrg <li><a href="#microblaze-x-elf">microblaze-*-elf</a>
     80  1.10  mrg <li><a href="#mips-x-x">mips-*-*</a>
     81  1.10  mrg <li><a href="#mips-sgi-irix5">mips-sgi-irix5</a>
     82  1.10  mrg <li><a href="#mips-sgi-irix6">mips-sgi-irix6</a>
     83  1.10  mrg <li><a href="#nds32le-x-elf">nds32le-*-elf</a>
     84  1.10  mrg <li><a href="#nds32be-x-elf">nds32be-*-elf</a>
     85  1.10  mrg <li><a href="#nvptx-x-none">nvptx-*-none</a>
     86  1.10  mrg <li><a href="#powerpc-x-x">powerpc*-*-*</a>
     87  1.10  mrg <li><a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
     88  1.10  mrg <li><a href="#powerpc-x-elf">powerpc-*-elf</a>
     89  1.10  mrg <li><a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
     90  1.10  mrg <li><a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
     91  1.10  mrg <li><a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
     92  1.10  mrg <li><a href="#powerpc-x-eabi">powerpc-*-eabi</a>
     93  1.10  mrg <li><a href="#powerpcle-x-elf">powerpcle-*-elf</a>
     94  1.10  mrg <li><a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
     95  1.10  mrg <li><a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
     96  1.10  mrg <li><a href="#riscv32-x-elf">riscv32-*-elf</a>
     97  1.10  mrg <li><a href="#riscv32-x-linux">riscv32-*-linux</a>
     98  1.10  mrg <li><a href="#riscv64-x-elf">riscv64-*-elf</a>
     99  1.10  mrg <li><a href="#riscv64-x-linux">riscv64-*-linux</a>
    100  1.10  mrg <li><a href="#s390-x-linux">s390-*-linux*</a>
    101  1.10  mrg <li><a href="#s390x-x-linux">s390x-*-linux*</a>
    102  1.10  mrg <li><a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    103  1.10  mrg <li><a href="#x-x-solaris2">*-*-solaris2*</a>
    104  1.10  mrg <li><a href="#sparc-x-x">sparc*-*-*</a>
    105  1.10  mrg <li><a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    106  1.10  mrg <li><a href="#sparc-sun-solaris210">sparc-sun-solaris2.10</a>
    107  1.10  mrg <li><a href="#sparc-x-linux">sparc-*-linux*</a>
    108  1.10  mrg <li><a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    109  1.10  mrg <li><a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    110  1.10  mrg <li><a href="#c6x-x-x">c6x-*-*</a>
    111  1.10  mrg <li><a href="#tilegx-x-linux">tilegx-*-linux*</a>
    112  1.10  mrg <li><a href="#tilegxbe-x-linux">tilegxbe-*-linux*</a>
    113  1.10  mrg <li><a href="#tilepro-x-linux">tilepro-*-linux*</a>
    114  1.10  mrg <li><a href="#visium-x-elf">visium-*-elf</a>
    115  1.10  mrg <li><a href="#x-x-vxworks">*-*-vxworks*</a>
    116  1.10  mrg <li><a href="#x86-64-x-x">x86_64-*-*</a> amd64-*-*
    117  1.10  mrg <li><a href="#x86-64-x-solaris210">x86_64-*-solaris2.1[0-9]*</a>
    118  1.10  mrg <li><a href="#xtensa-x-elf">xtensa*-*-elf</a>
    119  1.10  mrg <li><a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    120  1.10  mrg <li><a href="#windows">Microsoft Windows</a>
    121  1.10  mrg <li><a href="#x-x-cygwin">*-*-cygwin</a>
    122  1.10  mrg <li><a href="#x-x-mingw32">*-*-mingw32</a>
    123  1.10  mrg <li><a href="#os2">OS/2</a>
    124  1.10  mrg <li><a href="#older">Older systems</a>
    125  1.10  mrg </ul>
    126  1.10  mrg 
    127  1.10  mrg      <ul>
    128  1.10  mrg <li><a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.) 
    129  1.10  mrg </ul>
    130   1.8  mrg 
    131  1.10  mrg    <p><!-- -------- host/target specific issues start here ---------------- -->
    132  1.10  mrg <hr /><a name="aarch64-x-x"></a>
    133   1.6  mrg 
    134  1.10  mrg <h3 class="heading"><a name="TOC0"></a>aarch64*-*-*</h3>
    135   1.8  mrg 
    136  1.10  mrg <p>Binutils pre 2.24 does not have support for selecting <samp><span class="option">-mabi</span></samp> and
    137  1.10  mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    138  1.10  mrg not support option <samp><span class="option">-mabi=ilp32</span></samp>.
    139   1.8  mrg 
    140  1.10  mrg    <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    141  1.10  mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    142  1.10  mrg <samp><span class="option">--enable-fix-cortex-a53-835769</span></samp> option.  This will enable the fix by
    143  1.10  mrg default and can be explicitly disabled during compilation by passing the
    144  1.10  mrg <samp><span class="option">-mno-fix-cortex-a53-835769</span></samp> option.  Conversely,
    145  1.10  mrg <samp><span class="option">--disable-fix-cortex-a53-835769</span></samp> will disable the workaround by
    146  1.10  mrg default.  The workaround is disabled by default if neither of
    147  1.10  mrg <samp><span class="option">--enable-fix-cortex-a53-835769</span></samp> or
    148  1.10  mrg <samp><span class="option">--disable-fix-cortex-a53-835769</span></samp> is given at configure time.
    149   1.8  mrg 
    150  1.10  mrg    <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    151  1.10  mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    152  1.10  mrg <samp><span class="option">--enable-fix-cortex-a53-843419</span></samp> option.  This workaround is applied at
    153  1.10  mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    154  1.10  mrg to the linker.  It can be explicitly disabled during compilation by passing the
    155  1.10  mrg <samp><span class="option">-mno-fix-cortex-a53-843419</span></samp> option.  Conversely,
    156  1.10  mrg <samp><span class="option">--disable-fix-cortex-a53-843419</span></samp> will disable the workaround by default. 
    157  1.10  mrg The workaround is disabled by default if neither of
    158  1.10  mrg <samp><span class="option">--enable-fix-cortex-a53-843419</span></samp> or
    159  1.10  mrg <samp><span class="option">--disable-fix-cortex-a53-843419</span></samp> is given at configure time.
    160   1.8  mrg 
    161  1.10  mrg    <p><hr /><a name="alpha-x-x"></a>
    162   1.8  mrg 
    163  1.10  mrg <h3 class="heading"><a name="TOC1"></a>alpha*-*-*</h3>
    164   1.8  mrg 
    165  1.10  mrg <p>This section contains general configuration information for all
    166  1.10  mrg alpha-based platforms using ELF (in particular, ignore this section for
    167  1.10  mrg DEC OSF/1, Digital UNIX and Tru64 UNIX).  In addition to reading this
    168  1.10  mrg section, please read all other sections that match your target.
    169   1.8  mrg 
    170  1.10  mrg    <p>We require binutils 2.11.2 or newer. 
    171  1.10  mrg Previous binutils releases had a number of problems with DWARF 2
    172  1.10  mrg debugging information, not the least of which is incorrect linking of
    173  1.10  mrg shared libraries.
    174   1.8  mrg 
    175  1.10  mrg    <p><hr /><a name="alpha-dec-osf51"></a>
    176   1.8  mrg 
    177  1.10  mrg <h3 class="heading"><a name="TOC2"></a>alpha*-dec-osf5.1</h3>
    178   1.8  mrg 
    179  1.10  mrg <p>Systems using processors that implement the DEC Alpha architecture and
    180  1.10  mrg are running the DEC/Compaq/HP Unix (DEC OSF/1, Digital UNIX, or Compaq/HP
    181  1.10  mrg Tru64 UNIX) operating system, for example the DEC Alpha AXP systems.
    182   1.8  mrg 
    183  1.10  mrg    <p>Support for Tru64 UNIX V5.1 has been removed in GCC 4.8.  As of GCC 4.6,
    184  1.10  mrg support for Tru64 UNIX V4.0 and V5.0 has been removed.  As of GCC 3.2,
    185  1.10  mrg versions before <code>alpha*-dec-osf4</code> are no longer supported.  (These
    186  1.10  mrg are the versions which identify themselves as DEC OSF/1.)
    187   1.8  mrg 
    188  1.10  mrg    <p><hr /><a name="amd64-x-solaris210"></a>
    189   1.8  mrg 
    190  1.10  mrg <h3 class="heading"><a name="TOC3"></a>amd64-*-solaris2.1[0-9]*</h3>
    191   1.8  mrg 
    192  1.10  mrg <p>This is a synonym for &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo;.
    193   1.8  mrg 
    194  1.10  mrg    <p><hr /><a name="arc-x-elf32"></a>
    195   1.8  mrg 
    196  1.10  mrg <h3 class="heading"><a name="TOC4"></a>arc-*-elf32</h3>
    197   1.8  mrg 
    198  1.10  mrg <p>Use &lsquo;<samp><span class="samp">configure --target=arc-elf32 --with-cpu=</span><var>cpu</var><span class="samp"> --enable-languages="c,c++"</span></samp>&rsquo;
    199  1.10  mrg to configure GCC, with <var>cpu</var> being one of &lsquo;<samp><span class="samp">arc600</span></samp>&rsquo;, &lsquo;<samp><span class="samp">arc601</span></samp>&rsquo;,
    200  1.10  mrg or &lsquo;<samp><span class="samp">arc700</span></samp>&rsquo;.
    201   1.8  mrg 
    202  1.10  mrg    <p><hr /><a name="arc-linux-uclibc"></a>
    203   1.8  mrg 
    204  1.10  mrg <h3 class="heading"><a name="TOC5"></a>arc-linux-uclibc</h3>
    205   1.8  mrg 
    206  1.10  mrg <p>Use &lsquo;<samp><span class="samp">configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages="c,c++"</span></samp>&rsquo; to configure GCC.
    207   1.8  mrg 
    208  1.10  mrg    <p><hr /><a name="arm-x-eabi"></a>
    209   1.6  mrg 
    210  1.10  mrg <h3 class="heading"><a name="TOC6"></a>arm-*-eabi</h3>
    211   1.6  mrg 
    212  1.10  mrg <p>ARM-family processors.
    213   1.6  mrg 
    214  1.10  mrg    <p>Building the Ada frontend commonly fails (an infinite loop executing
    215   1.7  mrg <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    216   1.7  mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    217  1.10  mrg 
    218  1.10  mrg    <p><hr /><a name="avr"></a>
    219  1.10  mrg 
    220  1.10  mrg <h3 class="heading"><a name="TOC7"></a>avr</h3>
    221  1.10  mrg 
    222   1.1  mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    223  1.10  mrg applications.  There are no standard Unix configurations. 
    224   1.1  mrg See &ldquo;AVR Options&rdquo; in the main manual
    225   1.1  mrg for the list of supported MCU types.
    226  1.10  mrg 
    227  1.10  mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=avr --enable-languages="c"</span></samp>&rsquo; to configure GCC.
    228  1.10  mrg 
    229  1.10  mrg    <p>Further installation notes and other useful information about AVR tools
    230   1.1  mrg can also be obtained from:
    231  1.10  mrg 
    232  1.10  mrg      <ul>
    233  1.10  mrg <li><a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    234  1.10  mrg <li><a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    235  1.10  mrg </ul>
    236  1.10  mrg 
    237  1.10  mrg    <p>The following error:
    238  1.10  mrg <pre class="smallexample">     Error: register required
    239  1.10  mrg </pre>
    240  1.10  mrg    <p>indicates that you should upgrade to a newer version of the binutils.
    241  1.10  mrg 
    242  1.10  mrg    <p><hr /><a name="bfin"></a>
    243  1.10  mrg 
    244  1.10  mrg <h3 class="heading"><a name="TOC8"></a>Blackfin</h3>
    245  1.10  mrg 
    246  1.10  mrg <p>The Blackfin processor, an Analog Devices DSP. 
    247   1.1  mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    248  1.10  mrg 
    249  1.10  mrg    <p>More information, and a version of binutils with support for this processor,
    250  1.10  mrg is available at <a href="https://blackfin.uclinux.org">https://blackfin.uclinux.org</a>
    251  1.10  mrg 
    252  1.10  mrg    <p><hr /><a name="cr16"></a>
    253  1.10  mrg 
    254  1.10  mrg <h3 class="heading"><a name="TOC9"></a>CR16</h3>
    255  1.10  mrg 
    256   1.5  mrg <p>The CR16 CompactRISC architecture is a 16-bit architecture. This
    257   1.5  mrg architecture is used in embedded applications.
    258   1.3  mrg 
    259  1.10  mrg    <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    260  1.10  mrg 
    261  1.10  mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-elf --enable-languages=c,c++</span></samp>&rsquo; to configure
    262  1.10  mrg GCC for building a CR16 elf cross-compiler.
    263  1.10  mrg 
    264  1.10  mrg    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-uclinux --enable-languages=c,c++</span></samp>&rsquo; to
    265  1.10  mrg configure GCC for building a CR16 uclinux cross-compiler.
    266  1.10  mrg 
    267  1.10  mrg    <p><hr /><a name="cris"></a>
    268  1.10  mrg 
    269  1.10  mrg <h3 class="heading"><a name="TOC10"></a>CRIS</h3>
    270  1.10  mrg 
    271   1.1  mrg <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    272   1.1  mrg series.  These are used in embedded applications.
    273  1.10  mrg 
    274  1.10  mrg    <p>See &ldquo;CRIS Options&rdquo; in the main manual
    275   1.1  mrg for a list of CRIS-specific options.
    276  1.10  mrg 
    277  1.10  mrg    <p>There are a few different CRIS targets:
    278  1.10  mrg      <dl>
    279  1.10  mrg <dt><code>cris-axis-elf</code><dd>Mainly for monolithic embedded systems.  Includes a multilib for the
    280  1.10  mrg &lsquo;<samp><span class="samp">v10</span></samp>&rsquo; core used in &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo;. 
    281  1.10  mrg <br><dt><code>cris-axis-linux-gnu</code><dd>A GNU/Linux port for the CRIS architecture, currently targeting
    282  1.10  mrg &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo; by default. 
    283   1.1  mrg </dl>
    284   1.1  mrg 
    285  1.10  mrg    <p>Pre-packaged tools can be obtained from
    286   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
    287   1.1  mrg information about this platform is available at
    288   1.1  mrg <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    289  1.10  mrg 
    290  1.10  mrg    <p><hr /><a name="dos"></a>
    291  1.10  mrg 
    292  1.10  mrg <h3 class="heading"><a name="TOC11"></a>DOS</h3>
    293  1.10  mrg 
    294   1.1  mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    295  1.10  mrg 
    296  1.10  mrg    <p>You cannot install GCC by itself on MSDOS; it will not compile under
    297   1.1  mrg any MSDOS compiler except itself.  You need to get the complete
    298   1.1  mrg compilation package DJGPP, which includes binaries as well as sources,
    299   1.1  mrg and includes all the necessary compilation tools and libraries.
    300  1.10  mrg 
    301  1.10  mrg    <p><hr /><a name="epiphany-x-elf"></a>
    302  1.10  mrg 
    303  1.10  mrg <h3 class="heading"><a name="TOC12"></a>epiphany-*-elf</h3>
    304  1.10  mrg 
    305  1.10  mrg <p>Adapteva Epiphany. 
    306   1.3  mrg This configuration is intended for embedded systems.
    307  1.10  mrg 
    308  1.10  mrg    <p><hr /><a name="x-x-freebsd"></a>
    309  1.10  mrg 
    310  1.10  mrg <h3 class="heading"><a name="TOC13"></a>*-*-freebsd*</h3>
    311  1.10  mrg 
    312   1.1  mrg <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    313   1.1  mrg FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    314   1.1  mrg discontinued in GCC 4.0.
    315  1.10  mrg 
    316  1.10  mrg    <p>In order to better utilize FreeBSD base system functionality and match
    317   1.3  mrg the configuration of the system compiler, GCC 4.5 and above as well as
    318   1.3  mrg GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    319   1.3  mrg on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    320   1.3  mrg (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    321  1.10  mrg <samp><span class="file">libgcc_s.so.1</span></samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    322   1.3  mrg by GCC 4.5 and above.
    323  1.10  mrg 
    324  1.10  mrg    <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    325  1.10  mrg for all CPU architectures.  You may use <samp><span class="option">-gstabs</span></samp> instead of
    326  1.10  mrg <samp><span class="option">-g</span></samp>, if you really want the old debugging format.  There are
    327   1.1  mrg no known issues with mixing object files and libraries with different
    328   1.1  mrg debugging formats.  Otherwise, this release of GCC should now match
    329   1.1  mrg more of the configuration used in the stock FreeBSD configuration of
    330  1.10  mrg GCC.  In particular, <samp><span class="option">--enable-threads</span></samp> is now configured by
    331   1.1  mrg default.  However, as a general user, do not attempt to replace the
    332   1.1  mrg system compiler with this release.  Known to bootstrap and check with
    333   1.1  mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    334   1.1  mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    335   1.1  mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    336  1.10  mrg 
    337  1.10  mrg    <p>The version of binutils installed in <samp><span class="file">/usr/bin</span></samp> probably works
    338   1.1  mrg with this release of GCC.  Bootstrapping against the latest GNU
    339  1.10  mrg binutils and/or the version found in <samp><span class="file">/usr/ports/devel/binutils</span></samp> has
    340   1.1  mrg been known to enable additional features and improve overall testsuite
    341  1.10  mrg results.  However, it is currently known that boehm-gc may not configure
    342  1.10  mrg properly on FreeBSD prior to the FreeBSD 7.0 release with GNU binutils
    343  1.10  mrg after 2.16.1.
    344  1.10  mrg 
    345  1.10  mrg    <p><hr /><a name="ft32-x-elf"></a>
    346  1.10  mrg 
    347  1.10  mrg <h3 class="heading"><a name="TOC14"></a>ft32-*-elf</h3>
    348  1.10  mrg 
    349  1.10  mrg <p>The FT32 processor. 
    350   1.7  mrg This configuration is intended for embedded systems.
    351  1.10  mrg 
    352  1.10  mrg    <p><hr /><a name="h8300-hms"></a>
    353  1.10  mrg 
    354  1.10  mrg <h3 class="heading"><a name="TOC15"></a>h8300-hms</h3>
    355  1.10  mrg 
    356   1.1  mrg <p>Renesas H8/300 series of processors.
    357  1.10  mrg 
    358  1.10  mrg    <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    359  1.10  mrg 
    360  1.10  mrg    <p>The calling convention and structure layout has changed in release 2.6. 
    361   1.1  mrg All code must be recompiled.  The calling convention now passes the
    362   1.1  mrg first three arguments in function calls in registers.  Structures are no
    363   1.1  mrg longer a multiple of 2 bytes.
    364  1.10  mrg 
    365  1.10  mrg    <p><hr /><a name="hppa-hp-hpux"></a>
    366  1.10  mrg 
    367  1.10  mrg <h3 class="heading"><a name="TOC16"></a>hppa*-hp-hpux*</h3>
    368  1.10  mrg 
    369   1.1  mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    370  1.10  mrg 
    371  1.10  mrg    <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    372   1.1  mrg later is recommended.
    373  1.10  mrg 
    374  1.10  mrg    <p>It may be helpful to configure GCC with the
    375  1.10  mrg <a href="./configure.html#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> and
    376  1.10  mrg <samp><span class="option">--with-as=...</span></samp> options to ensure that GCC can find GAS.
    377  1.10  mrg 
    378  1.10  mrg    <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    379  1.10  mrg not work.  It shouldn't be used with any languages other than C due to its
    380   1.1  mrg many limitations.
    381  1.10  mrg 
    382  1.10  mrg    <p>Specifically, <samp><span class="option">-g</span></samp> does not work (HP-UX uses a peculiar debugging
    383   1.1  mrg format which GCC does not know about).  It also inserts timestamps
    384   1.1  mrg into each object file it creates, causing the 3-stage comparison test to
    385   1.1  mrg fail during a bootstrap.  You should be able to continue by saying
    386  1.10  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;.
    387  1.10  mrg 
    388  1.10  mrg    <p>Various GCC features are not supported.  For example, it does not support weak
    389   1.1  mrg symbols or alias definitions.  As a result, explicit template instantiations
    390   1.1  mrg are required when using C++.  This makes it difficult if not impossible to
    391   1.1  mrg build many C++ applications.
    392  1.10  mrg 
    393  1.10  mrg    <p>There are two default scheduling models for instructions.  These are
    394   1.1  mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    395  1.10  mrg architecture specified for the target machine when configuring. 
    396   1.1  mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    397  1.10  mrg the target is a &lsquo;<samp><span class="samp">hppa1*</span></samp>&rsquo; machine.
    398  1.10  mrg 
    399  1.10  mrg    <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    400   1.1  mrg it is important to completely specify the machine architecture when
    401   1.1  mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    402   1.1  mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    403   1.1  mrg default scheduling model is desired.
    404  1.10  mrg 
    405  1.10  mrg    <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    406  1.10  mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later. 
    407   1.1  mrg This namespace change might cause problems when bootstrapping with
    408   1.1  mrg an earlier version of GCC or the HP compiler as essentially the same
    409   1.1  mrg namespace is required for an entire build.  This problem can be avoided
    410  1.10  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;
    411  1.10  mrg or &lsquo;<samp><span class="samp">98</span></samp>&rsquo;.  Another way is to add an appropriate set of predefines
    412  1.10  mrg to <samp><span class="env">CC</span></samp>.  The description for the <samp><span class="option">munix=</span></samp> option contains
    413   1.1  mrg a list of the predefines used with each standard.
    414  1.10  mrg 
    415  1.10  mrg    <p>More specific information to &lsquo;<samp><span class="samp">hppa*-hp-hpux*</span></samp>&rsquo; targets follows.
    416  1.10  mrg 
    417  1.10  mrg    <p><hr /><a name="hppa-hp-hpux10"></a>
    418  1.10  mrg 
    419  1.10  mrg <h3 class="heading"><a name="TOC17"></a>hppa*-hp-hpux10</h3>
    420  1.10  mrg 
    421   1.1  mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    422   1.1  mrg <code>PHCO_19798</code> from HP.
    423  1.10  mrg 
    424  1.10  mrg    <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    425   1.1  mrg used for one-only code and data.  This resolves many of the previous
    426   1.1  mrg problems in using C++ on this target.  However, the ABI is not compatible
    427   1.1  mrg with the one implemented under HP-UX 11 using secondary definitions.
    428  1.10  mrg 
    429  1.10  mrg    <p><hr /><a name="hppa-hp-hpux11"></a>
    430  1.10  mrg 
    431  1.10  mrg <h3 class="heading"><a name="TOC18"></a>hppa*-hp-hpux11</h3>
    432  1.10  mrg 
    433   1.1  mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    434   1.1  mrg be used to compile GCC 3.0 and up.
    435  1.10  mrg 
    436  1.10  mrg    <p>The libffi library haven't been ported to 64-bit HP-UX and doesn't build.
    437  1.10  mrg 
    438  1.10  mrg    <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    439   1.1  mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    440  1.10  mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    441   1.1  mrg only available for the 32-bit PA-RISC runtime.
    442  1.10  mrg 
    443  1.10  mrg    <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    444  1.10  mrg bundled compiler supports only traditional C; you will need either HP's
    445   1.1  mrg unbundled compiler, or a binary distribution of GCC.
    446  1.10  mrg 
    447  1.10  mrg    <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    448   1.1  mrg but the process requires several steps.  GCC 3.3 can then be used to
    449  1.10  mrg build later versions.
    450  1.10  mrg 
    451  1.10  mrg    <p>There are several possible approaches to building the distribution. 
    452   1.1  mrg Binutils can be built first using the HP tools.  Then, the GCC
    453   1.1  mrg distribution can be built.  The second approach is to build GCC
    454  1.10  mrg first using the HP tools, then build binutils, then rebuild GCC. 
    455   1.1  mrg There have been problems with various binary distributions, so it
    456   1.1  mrg is best not to start from a binary distribution.
    457  1.10  mrg 
    458  1.10  mrg    <p>On 64-bit capable systems, there are two distinct targets.  Different
    459   1.1  mrg installation prefixes must be used if both are to be installed on
    460  1.10  mrg the same system.  The &lsquo;<samp><span class="samp">hppa[1-2]*-hp-hpux11*</span></samp>&rsquo; target generates code
    461  1.10  mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker. 
    462  1.10  mrg The &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target generates 64-bit code for the
    463   1.1  mrg PA-RISC 2.0 architecture.
    464  1.10  mrg 
    465  1.10  mrg    <p>The script config.guess now selects the target type based on the compiler
    466  1.10  mrg detected during configuration.  You must define <samp><span class="env">PATH</span></samp> or <samp><span class="env">CC</span></samp> so
    467  1.10  mrg that configure finds an appropriate compiler for the initial bootstrap. 
    468  1.10  mrg When <samp><span class="env">CC</span></samp> is used, the definition should contain the options that are
    469  1.10  mrg needed whenever <samp><span class="env">CC</span></samp> is used.
    470  1.10  mrg 
    471  1.10  mrg    <p>Specifically, options that determine the runtime architecture must be
    472  1.10  mrg in <samp><span class="env">CC</span></samp> to correctly select the target for the build.  It is also
    473  1.10  mrg convenient to place many other compiler options in <samp><span class="env">CC</span></samp>.  For example,
    474  1.10  mrg <samp><span class="env">CC="cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE"</span></samp>
    475   1.1  mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    476  1.10  mrg 64-bit K&amp;R/bundled mode.  The <samp><span class="option">+DA2.0W</span></samp> option will result in
    477  1.10  mrg the automatic selection of the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target.  The
    478   1.1  mrg macro definition table of cpp needs to be increased for a successful
    479   1.1  mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    480   1.1  mrg be defined when building with the bundled compiler, or when using the
    481  1.10  mrg <samp><span class="option">-Ac</span></samp> option.  These defines aren't necessary with <samp><span class="option">-Ae</span></samp>.
    482  1.10  mrg 
    483  1.10  mrg    <p>It is best to explicitly configure the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target
    484  1.10  mrg with the <samp><span class="option">--with-ld=...</span></samp> option.  This overrides the standard
    485   1.1  mrg search for ld.  The two linkers supported on this target require different
    486   1.1  mrg commands.  The default linker is determined during configuration.  As a
    487  1.10  mrg result, it's not possible to switch linkers in the middle of a GCC build. 
    488   1.1  mrg This has been reported to sometimes occur in unified builds of binutils
    489   1.1  mrg and GCC.
    490  1.10  mrg 
    491  1.10  mrg    <p>A recent linker patch must be installed for the correct operation of
    492   1.1  mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    493   1.1  mrg oldest linker patches that are known to work.  They are for HP-UX
    494   1.1  mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    495  1.10  mrg <code>PHSS_24304</code>, might be usable but it hasn't been tested.  These
    496   1.1  mrg patches have been superseded.  Consult the HP patch database to obtain
    497   1.1  mrg the currently recommended linker patch for your system.
    498  1.10  mrg 
    499  1.10  mrg    <p>The patches are necessary for the support of weak symbols on the
    500   1.1  mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    501   1.1  mrg symbols are implemented using SOM secondary definition symbols.  Prior
    502  1.10  mrg to HP-UX 11, there are bugs in the linker support for secondary symbols. 
    503   1.1  mrg The patches correct a problem of linker core dumps creating shared
    504   1.1  mrg libraries containing secondary symbols, as well as various other
    505   1.1  mrg linking issues involving secondary symbols.
    506  1.10  mrg 
    507  1.10  mrg    <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    508   1.1  mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    509  1.10  mrg uses the linker <samp><span class="option">+init</span></samp> and <samp><span class="option">+fini</span></samp> options for the same
    510   1.1  mrg purpose.  The patches correct various problems with the +init/+fini
    511   1.1  mrg options, including program core dumps.  Binutils 2.14 corrects a
    512  1.10  mrg problem on the 64-bit port resulting from HP's non-standard use of
    513   1.1  mrg the .init and .fini sections for array initializers and finalizers.
    514  1.10  mrg 
    515  1.10  mrg    <p>Although the HP and GNU linkers are both supported for the
    516  1.10  mrg &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target, it is strongly recommended that the
    517   1.1  mrg HP linker be used for link editing on this target.
    518  1.10  mrg 
    519  1.10  mrg    <p>At this time, the GNU linker does not support the creation of long
    520  1.10  mrg branch stubs.  As a result, it cannot successfully link binaries
    521   1.1  mrg containing branch offsets larger than 8 megabytes.  In addition,
    522   1.1  mrg there are problems linking shared libraries, linking executables
    523  1.10  mrg with <samp><span class="option">-static</span></samp>, and with dwarf2 unwind and exception support. 
    524  1.10  mrg It also doesn't provide stubs for internal calls to global functions
    525  1.10  mrg in shared libraries, so these calls cannot be overloaded.
    526  1.10  mrg 
    527  1.10  mrg    <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    528   1.1  mrg versioning is not supported.  It may be necessary to disable symbol
    529  1.10  mrg versioning with <samp><span class="option">--disable-symvers</span></samp> when using GNU ld.
    530  1.10  mrg 
    531  1.10  mrg    <p>POSIX threads are the default.  The optional DCE thread library is not
    532  1.10  mrg supported, so <samp><span class="option">--enable-threads=dce</span></samp> does not work.
    533  1.10  mrg 
    534  1.10  mrg    <p><hr /><a name="x-x-linux-gnu"></a>
    535  1.10  mrg 
    536  1.10  mrg <h3 class="heading"><a name="TOC19"></a>*-*-linux-gnu</h3>
    537  1.10  mrg 
    538   1.1  mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    539   1.1  mrg in glibc 2.2.5 and later.  More information is available in the
    540   1.1  mrg libstdc++-v3 documentation.
    541  1.10  mrg 
    542  1.10  mrg    <p><hr /><a name="ix86-x-linux"></a>
    543  1.10  mrg 
    544  1.10  mrg <h3 class="heading"><a name="TOC20"></a>i?86-*-linux*</h3>
    545  1.10  mrg 
    546  1.10  mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform. 
    547   1.1  mrg See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    548  1.10  mrg 
    549  1.10  mrg    <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    550   1.1  mrg possible you have a hardware problem.  Further information on this can be
    551   1.1  mrg found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    552  1.10  mrg 
    553  1.10  mrg    <p><hr /><a name="ix86-x-solaris210"></a>
    554  1.10  mrg 
    555  1.10  mrg <h3 class="heading"><a name="TOC21"></a>i?86-*-solaris2.10</h3>
    556  1.10  mrg 
    557   1.3  mrg <p>Use this for Solaris 10 or later on x86 and x86-64 systems.  Starting
    558  1.10  mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp><span class="samp">amd64-*-solaris2.1[0-9]*</span></samp>&rsquo; or
    559  1.10  mrg &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo; configuration that corresponds to
    560  1.10  mrg &lsquo;<samp><span class="samp">sparcv9-sun-solaris2*</span></samp>&rsquo;.
    561  1.10  mrg 
    562  1.10  mrg    <p>It is recommended that you configure GCC to use the GNU assembler.  The
    563   1.7  mrg versions included in Solaris 10, from GNU binutils 2.15 (in
    564  1.10  mrg <samp><span class="file">/usr/sfw/bin/gas</span></samp>), and Solaris 11, from GNU binutils 2.19 or
    565  1.10  mrg newer (also available as <samp><span class="file">/usr/bin/gas</span></samp> and
    566  1.10  mrg <samp><span class="file">/usr/gnu/bin/as</span></samp>), work fine.  Please note that the current
    567   1.7  mrg version, from GNU binutils 2.26, only works on Solaris 12 when using the
    568   1.7  mrg Solaris linker.  On Solaris 10 and 11, you either have to wait for GNU
    569   1.7  mrg binutils 2.26.1 or newer, or stay with GNU binutils 2.25.1.  Recent
    570  1.10  mrg versions of the Solaris assembler in <samp><span class="file">/usr/ccs/bin/as</span></samp> work almost
    571  1.10  mrg as well, though. 
    572  1.10  mrg <!-- FIXME: as patch requirements? -->
    573  1.10  mrg 
    574  1.10  mrg    <p>For linking, the Solaris linker, is preferred.  If you want to use the GNU
    575   1.7  mrg linker instead, note that due to a packaging bug the version in Solaris
    576  1.10  mrg 10, from GNU binutils 2.15 (in <samp><span class="file">/usr/sfw/bin/gld</span></samp>), cannot be used,
    577   1.7  mrg while the version in Solaris 11, from GNU binutils 2.19 or newer (also
    578  1.10  mrg in <samp><span class="file">/usr/gnu/bin/ld</span></samp> and <samp><span class="file">/usr/bin/gld</span></samp>), works, as does the
    579   1.7  mrg latest version, from GNU binutils 2.26.
    580  1.10  mrg 
    581  1.10  mrg    <p>To use GNU <samp><span class="command">as</span></samp>, configure with the options
    582  1.10  mrg <samp><span class="option">--with-gnu-as --with-as=/usr/sfw/bin/gas</span></samp>.  It may be necessary
    583  1.10  mrg to configure with <samp><span class="option">--without-gnu-ld --with-ld=/usr/ccs/bin/ld</span></samp> to
    584  1.10  mrg guarantee use of Sun <samp><span class="command">ld</span></samp>. 
    585  1.10  mrg <!-- FIXME: why -without-gnu-ld -with-ld? -->
    586  1.10  mrg 
    587  1.10  mrg    <p><hr /><a name="ia64-x-linux"></a>
    588  1.10  mrg 
    589  1.10  mrg <h3 class="heading"><a name="TOC22"></a>ia64-*-linux</h3>
    590  1.10  mrg 
    591   1.1  mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    592   1.1  mrg running GNU/Linux.
    593  1.10  mrg 
    594  1.10  mrg    <p>If you are using the installed system libunwind library with
    595  1.10  mrg <samp><span class="option">--with-system-libunwind</span></samp>, then you must use libunwind 0.98 or
    596   1.1  mrg later.
    597  1.10  mrg 
    598  1.10  mrg    <p>None of the following versions of GCC has an ABI that is compatible
    599   1.1  mrg with any of the other versions in this list, with the exception that
    600   1.1  mrg Red Hat 2.96 and Trillian 000171 are compatible with each other:
    601  1.10  mrg 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. 
    602  1.10  mrg This primarily affects C++ programs and programs that create shared libraries. 
    603  1.10  mrg GCC 3.1 or later is recommended for compiling linux, the kernel. 
    604   1.1  mrg As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    605   1.1  mrg more major ABI changes are expected.
    606  1.10  mrg 
    607  1.10  mrg    <p><hr /><a name="ia64-x-hpux"></a>
    608  1.10  mrg 
    609  1.10  mrg <h3 class="heading"><a name="TOC23"></a>ia64-*-hpux*</h3>
    610  1.10  mrg 
    611   1.1  mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    612   1.1  mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    613  1.10  mrg the option <samp><span class="option">--with-gnu-as</span></samp> may be necessary.
    614  1.10  mrg 
    615  1.10  mrg    <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    616  1.10  mrg GCC versions 3.2.3 and earlier, <samp><span class="option">--enable-libunwind-exceptions</span></samp>
    617  1.10  mrg is required to build GCC.  For GCC 3.3 and later, this is the default. 
    618  1.10  mrg For gcc 3.4.3 and later, <samp><span class="option">--enable-libunwind-exceptions</span></samp> is
    619   1.1  mrg removed and the system libunwind library will always be used.
    620  1.10  mrg 
    621  1.10  mrg    <p><hr />
    622  1.10  mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* --><a name="x-ibm-aix"></a>
    623  1.10  mrg 
    624  1.10  mrg <h3 class="heading"><a name="TOC24"></a>*-ibm-aix*</h3>
    625  1.10  mrg 
    626  1.10  mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4. 
    627   1.1  mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    628  1.10  mrg 
    629  1.10  mrg    <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    630   1.1  mrg process resource limits (ulimit).  Hard limits are configured in the
    631  1.10  mrg <samp><span class="file">/etc/security/limits</span></samp> system configuration file.
    632  1.10  mrg 
    633  1.10  mrg    <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    634   1.7  mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    635   1.7  mrg G++ can bootstrap recent releases of GCC.
    636  1.10  mrg 
    637  1.10  mrg    <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    638   1.1  mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    639   1.1  mrg requires a larger data segment, which can be enabled through the
    640   1.1  mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    641   1.1  mrg 
    642  1.10  mrg <pre class="smallexample">     % LDR_CNTRL=MAXDATA=0x50000000
    643  1.10  mrg      % export LDR_CNTRL
    644  1.10  mrg </pre>
    645  1.10  mrg    <p>One can start with a pre-compiled version of GCC to build from
    646  1.10  mrg sources.  One may delete GCC's &ldquo;fixed&rdquo; header files when starting
    647   1.1  mrg with a version of GCC built for an earlier release of AIX.
    648   1.1  mrg 
    649  1.10  mrg    <p>To speed up the configuration phases of bootstrapping and installing GCC,
    650  1.10  mrg one may use GNU Bash instead of AIX <samp><span class="command">/bin/sh</span></samp>, e.g.,
    651  1.10  mrg 
    652  1.10  mrg <pre class="smallexample">     % CONFIG_SHELL=/opt/freeware/bin/bash
    653  1.10  mrg      % export CONFIG_SHELL
    654  1.10  mrg </pre>
    655  1.10  mrg    <p>and then proceed as described in <a href="build.html">the build instructions</a>, where we strongly recommend specifying an absolute path
    656   1.1  mrg to invoke <var>srcdir</var>/configure.
    657  1.10  mrg 
    658  1.10  mrg    <p>Because GCC on AIX is built as a 32-bit executable by default,
    659   1.1  mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    660   1.1  mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    661   1.1  mrg as static archive libraries works better than shared libraries.
    662  1.10  mrg 
    663  1.10  mrg    <p>Errors involving <code>alloca</code> when building GCC generally are due
    664   1.1  mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    665   1.1  mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    666  1.10  mrg the build, the native AIX compiler <strong>must</strong> be invoked as <samp><span class="command">cc</span></samp>
    667  1.10  mrg (not <samp><span class="command">xlc</span></samp>).  Once <samp><span class="command">configure</span></samp> has been informed of
    668  1.10  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
    669  1.10  mrg configure cache files and ensure that <samp><span class="env">CC</span></samp> environment variable
    670  1.10  mrg does not provide a definition that will confuse <samp><span class="command">configure</span></samp>. 
    671   1.1  mrg If this error occurs during stage2 or later, then the problem most likely
    672   1.1  mrg is the version of Make (see above).
    673  1.10  mrg 
    674  1.10  mrg    <p>The native <samp><span class="command">as</span></samp> and <samp><span class="command">ld</span></samp> are recommended for
    675   1.3  mrg bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    676   1.3  mrg Binutils version 2.20 is the minimum level that supports bootstrap on
    677  1.10  mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6 or
    678   1.3  mrg AIX 7.  The native AIX tools do interoperate with GCC.
    679  1.10  mrg 
    680  1.10  mrg    <p>AIX 7.1 added partial support for DWARF debugging, but full support
    681   1.7  mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    682   1.7  mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    683   1.7  mrg of libm.a missing important symbols; a fix for IV77796 will be
    684   1.7  mrg included in SP6.
    685  1.10  mrg 
    686  1.10  mrg    <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    687   1.3  mrg assembler change that sometimes produces corrupt assembly files
    688   1.3  mrg causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    689   1.3  mrg can cause compilation failures with existing GCC installations.  An
    690   1.3  mrg AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    691   1.3  mrg IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    692   1.3  mrg AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    693   1.3  mrg AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    694  1.10  mrg 
    695  1.10  mrg    <p>Building <samp><span class="file">libstdc++.a</span></samp> requires a fix for an AIX Assembler bug
    696   1.1  mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    697   1.1  mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    698   1.1  mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    699  1.10  mrg 
    700  1.10  mrg    <p><a name="TransferAixShobj"></a>&lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; in GCC 3.4 increments the major version number of the
    701  1.10  mrg shared object and GCC installation places the <samp><span class="file">libstdc++.a</span></samp>
    702   1.1  mrg shared library in a common location which will overwrite the and GCC
    703   1.1  mrg 3.3 version of the shared library.  Applications either need to be
    704   1.1  mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    705  1.10  mrg versions of the &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; shared object needs to be available
    706  1.10  mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp><span class="samp">libstdc++.so.4</span></samp>&rsquo;, if
    707  1.10  mrg present, and GCC 3.3 &lsquo;<samp><span class="samp">libstdc++.so.5</span></samp>&rsquo; shared objects can be
    708   1.1  mrg installed for runtime dynamic loading using the following steps to set
    709  1.10  mrg the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag in the shared object for <em>each</em>
    710  1.10  mrg multilib <samp><span class="file">libstdc++.a</span></samp> installed:
    711   1.1  mrg 
    712  1.10  mrg    <p>Extract the shared objects from the currently installed
    713  1.10  mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    714  1.10  mrg <pre class="smallexample">     % ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    715  1.10  mrg </pre>
    716  1.10  mrg    <p>Enable the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag so that the shared object will be
    717   1.1  mrg available for runtime dynamic loading, but not linking:
    718  1.10  mrg <pre class="smallexample">     % strip -e libstdc++.so.4 libstdc++.so.5
    719  1.10  mrg </pre>
    720  1.10  mrg    <p>Archive the runtime-only shared object in the GCC 3.4
    721  1.10  mrg <samp><span class="file">libstdc++.a</span></samp> archive:
    722  1.10  mrg <pre class="smallexample">     % ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    723  1.10  mrg </pre>
    724  1.10  mrg    <p>Eventually, the
    725  1.10  mrg <a href="./configure.html#WithAixSoname"><samp><span class="option">--with-aix-soname=svr4</span></samp></a>
    726   1.5  mrg configure option may drop the need for this procedure for libraries that
    727   1.5  mrg support it.
    728  1.10  mrg 
    729  1.10  mrg    <p>Linking executables and shared libraries may produce warnings of
    730   1.1  mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    731   1.1  mrg have included multiple symbol definitions for certain global variable
    732   1.1  mrg and function declarations in the original program.  The warnings should
    733   1.1  mrg not prevent the linker from producing a correct library or runnable
    734   1.1  mrg executable.
    735  1.10  mrg 
    736  1.10  mrg    <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    737   1.1  mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    738  1.10  mrg to parse archive libraries did not handle the new format correctly. 
    739   1.1  mrg These routines are used by GCC and result in error messages during
    740   1.1  mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    741  1.10  mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp><span class="option">-g</span></samp>
    742   1.1  mrg option of the archive command may be used to create archives of 32-bit
    743   1.1  mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    744   1.1  mrg routines is shipped with AIX 4.3.2 and above.
    745  1.10  mrg 
    746  1.10  mrg    <p>Some versions of the AIX binder (linker) can fail with a relocation
    747  1.10  mrg overflow severe error when the <samp><span class="option">-bbigtoc</span></samp> option is used to link
    748   1.1  mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    749   1.1  mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    750   1.1  mrg available from IBM Customer Support and from its
    751   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    752   1.1  mrg website as PTF U455193.
    753  1.10  mrg 
    754  1.10  mrg    <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    755   1.1  mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    756   1.1  mrg APAR IX87327 is available from IBM Customer Support and from its
    757   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    758   1.1  mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    759  1.10  mrg 
    760  1.10  mrg    <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    761   1.1  mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    762   1.1  mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    763   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    764   1.1  mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    765  1.10  mrg 
    766  1.10  mrg    <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    767   1.1  mrg use NLS to support locale-specific representations of various data
    768  1.10  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
    769   1.1  mrg separating decimal fractions).  There have been problems reported where
    770   1.1  mrg GCC does not produce the same floating-point formats that the assembler
    771  1.10  mrg expects.  If one encounters this problem, set the <samp><span class="env">LANG</span></samp>
    772  1.10  mrg environment variable to &lsquo;<samp><span class="samp">C</span></samp>&rsquo; or &lsquo;<samp><span class="samp">En_US</span></samp>&rsquo;.
    773  1.10  mrg 
    774  1.10  mrg    <p>A default can be specified with the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    775  1.10  mrg switch and using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    776  1.10  mrg 
    777  1.10  mrg    <p><hr /><a name="iq2000-x-elf"></a>
    778  1.10  mrg 
    779  1.10  mrg <h3 class="heading"><a name="TOC25"></a>iq2000-*-elf</h3>
    780  1.10  mrg 
    781   1.1  mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    782   1.1  mrg applications.  There are no standard Unix configurations.
    783  1.10  mrg 
    784  1.10  mrg    <p><hr /><a name="lm32-x-elf"></a>
    785  1.10  mrg 
    786  1.10  mrg <h3 class="heading"><a name="TOC26"></a>lm32-*-elf</h3>
    787  1.10  mrg 
    788  1.10  mrg <p>Lattice Mico32 processor. 
    789   1.1  mrg This configuration is intended for embedded systems.
    790  1.10  mrg 
    791  1.10  mrg    <p><hr /><a name="lm32-x-uclinux"></a>
    792  1.10  mrg 
    793  1.10  mrg <h3 class="heading"><a name="TOC27"></a>lm32-*-uclinux</h3>
    794  1.10  mrg 
    795  1.10  mrg <p>Lattice Mico32 processor. 
    796   1.1  mrg This configuration is intended for embedded systems running uClinux.
    797  1.10  mrg 
    798  1.10  mrg    <p><hr /><a name="m32c-x-elf"></a>
    799  1.10  mrg 
    800  1.10  mrg <h3 class="heading"><a name="TOC28"></a>m32c-*-elf</h3>
    801  1.10  mrg 
    802  1.10  mrg <p>Renesas M32C processor. 
    803   1.1  mrg This configuration is intended for embedded systems.
    804  1.10  mrg 
    805  1.10  mrg    <p><hr /><a name="m32r-x-elf"></a>
    806  1.10  mrg 
    807  1.10  mrg <h3 class="heading"><a name="TOC29"></a>m32r-*-elf</h3>
    808  1.10  mrg 
    809  1.10  mrg <p>Renesas M32R processor. 
    810   1.1  mrg This configuration is intended for embedded systems.
    811  1.10  mrg 
    812  1.10  mrg    <p><hr /><a name="m68k-x-x"></a>
    813  1.10  mrg 
    814  1.10  mrg <h3 class="heading"><a name="TOC30"></a>m68k-*-*</h3>
    815  1.10  mrg 
    816   1.1  mrg <p>By default,
    817  1.10  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
    818  1.10  mrg &lsquo;<samp><span class="samp">m68k-*-linux</span></samp>&rsquo;
    819   1.1  mrg build libraries for both M680x0 and ColdFire processors.  If you only
    820   1.1  mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    821  1.10  mrg <samp><span class="option">--with-arch=m68k</span></samp> to <samp><span class="command">configure</span></samp>.  Alternatively, you
    822  1.10  mrg can omit the M680x0 libraries by passing <samp><span class="option">--with-arch=cf</span></samp> to
    823  1.10  mrg <samp><span class="command">configure</span></samp>.  These targets default to 5206 or 5475 code as
    824   1.1  mrg appropriate for the target system when
    825  1.10  mrg configured with <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    826  1.10  mrg 
    827  1.10  mrg    <p>The &lsquo;<samp><span class="samp">m68k-*-netbsd</span></samp>&rsquo; and
    828  1.10  mrg &lsquo;<samp><span class="samp">m68k-*-openbsd</span></samp>&rsquo; targets also support the <samp><span class="option">--with-arch</span></samp>
    829   1.1  mrg option.  They will generate ColdFire CFV4e code when configured with
    830  1.10  mrg <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    831  1.10  mrg 
    832  1.10  mrg    <p>You can override the default processors listed above by configuring
    833  1.10  mrg with <samp><span class="option">--with-cpu=</span><var>target</var></samp>.  This <var>target</var> can either
    834  1.10  mrg be a <samp><span class="option">-mcpu</span></samp> argument or one of the following values:
    835  1.10  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;,
    836  1.10  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;.
    837  1.10  mrg 
    838  1.10  mrg    <p>GCC requires at least binutils version 2.17 on these targets.
    839  1.10  mrg 
    840  1.10  mrg    <p><hr /><a name="m68k-x-uclinux"></a>
    841  1.10  mrg 
    842  1.10  mrg <h3 class="heading"><a name="TOC31"></a>m68k-*-uclinux</h3>
    843  1.10  mrg 
    844   1.1  mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    845  1.10  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. 
    846   1.1  mrg It also added improved support for C++ and flat shared libraries,
    847   1.3  mrg both of which were ABI changes.
    848  1.10  mrg 
    849  1.10  mrg    <p><hr /><a name="microblaze-x-elf"></a>
    850  1.10  mrg 
    851  1.10  mrg <h3 class="heading"><a name="TOC32"></a>microblaze-*-elf</h3>
    852  1.10  mrg 
    853  1.10  mrg <p>Xilinx MicroBlaze processor. 
    854   1.1  mrg This configuration is intended for embedded systems.
    855  1.10  mrg 
    856  1.10  mrg    <p><hr /><a name="mips-x-x"></a>
    857  1.10  mrg 
    858  1.10  mrg <h3 class="heading"><a name="TOC33"></a>mips-*-*</h3>
    859  1.10  mrg 
    860   1.1  mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    861  1.10  mrg sections for all it's [sic] sectons [sic]&rdquo;, don't worry about it.  This
    862   1.1  mrg happens whenever you use GAS with the MIPS linker, but there is not
    863   1.1  mrg really anything wrong, and it is okay to use the output file.  You can
    864   1.1  mrg stop such warnings by installing the GNU linker.
    865  1.10  mrg 
    866  1.10  mrg    <p>It would be nice to extend GAS to produce the gp tables, but they are
    867   1.1  mrg optional, and there should not be a warning about their absence.
    868  1.10  mrg 
    869  1.10  mrg    <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    870   1.1  mrg and later.  A patch went in just after the GCC 3.3 release to
    871  1.10  mrg make &lsquo;<samp><span class="samp">mips*-*-*</span></samp>&rsquo; use the generic implementation instead.  You can also
    872  1.10  mrg configure for &lsquo;<samp><span class="samp">mipsel-elf</span></samp>&rsquo; as a workaround.  The
    873  1.10  mrg &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; target continues to use the MIPS II routines.  More
    874   1.1  mrg work on this is expected in future releases.
    875   1.1  mrg 
    876  1.10  mrg <!-- If you make -with-llsc the default for another target, please also -->
    877  1.10  mrg <!-- update the description of the -with-llsc option. -->
    878  1.10  mrg    <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    879  1.10  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
    880  1.10  mrg &lsquo;<samp><span class="samp">sync</span></samp>&rsquo; instructions.  This can be overridden by passing
    881  1.10  mrg <samp><span class="option">--with-llsc</span></samp> or <samp><span class="option">--without-llsc</span></samp> when configuring GCC. 
    882   1.1  mrg Since the Linux kernel emulates these instructions if they are
    883  1.10  mrg missing, the default for &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; targets is
    884  1.10  mrg <samp><span class="option">--with-llsc</span></samp>.  The <samp><span class="option">--with-llsc</span></samp> and
    885  1.10  mrg <samp><span class="option">--without-llsc</span></samp> configure options may be overridden at compile
    886  1.10  mrg time by passing the <samp><span class="option">-mllsc</span></samp> or <samp><span class="option">-mno-llsc</span></samp> options to
    887   1.1  mrg the compiler.
    888  1.10  mrg 
    889  1.10  mrg    <p>MIPS systems check for division by zero (unless
    890  1.10  mrg <samp><span class="option">-mno-check-zero-division</span></samp> is passed to the compiler) by
    891   1.1  mrg generating either a conditional trap or a break instruction.  Using
    892   1.1  mrg trap results in smaller code, but is only supported on MIPS II and
    893   1.1  mrg later.  Also, some versions of the Linux kernel have a bug that
    894   1.1  mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    895  1.10  mrg the use of break, use the <samp><span class="option">--with-divide=breaks</span></samp>
    896  1.10  mrg <samp><span class="command">configure</span></samp> option when configuring GCC.  The default is to
    897   1.1  mrg use traps on systems that support them.
    898  1.10  mrg 
    899  1.10  mrg    <p><hr /><a name="mips-sgi-irix5"></a>
    900  1.10  mrg 
    901  1.10  mrg <h3 class="heading"><a name="TOC34"></a>mips-sgi-irix5</h3>
    902  1.10  mrg 
    903   1.3  mrg <p>Support for IRIX 5 has been removed in GCC 4.6.
    904  1.10  mrg 
    905  1.10  mrg    <p><hr /><a name="mips-sgi-irix6"></a>
    906  1.10  mrg 
    907  1.10  mrg <h3 class="heading"><a name="TOC35"></a>mips-sgi-irix6</h3>
    908  1.10  mrg 
    909   1.3  mrg <p>Support for IRIX 6.5 has been removed in GCC 4.8.  Support for IRIX 6
    910   1.3  mrg releases before 6.5 has been removed in GCC 4.6, as well as support for
    911   1.3  mrg the O32 ABI.
    912  1.10  mrg 
    913  1.10  mrg    <p><hr /><a name="moxie-x-elf"></a>
    914  1.10  mrg 
    915  1.10  mrg <h3 class="heading"><a name="TOC36"></a>moxie-*-elf</h3>
    916  1.10  mrg 
    917   1.3  mrg <p>The moxie processor.
    918  1.10  mrg 
    919  1.10  mrg    <p><hr /><a name="msp430-x-elf"></a>
    920  1.10  mrg 
    921  1.10  mrg <h3 class="heading"><a name="TOC37"></a>msp430-*-elf</h3>
    922  1.10  mrg 
    923  1.10  mrg <p>TI MSP430 processor. 
    924   1.5  mrg This configuration is intended for embedded systems.
    925  1.10  mrg 
    926  1.10  mrg    <p><hr /><a name="nds32le-x-elf"></a>
    927  1.10  mrg 
    928  1.10  mrg <h3 class="heading"><a name="TOC38"></a>nds32le-*-elf</h3>
    929  1.10  mrg 
    930   1.5  mrg <p>Andes NDS32 target in little endian mode.
    931  1.10  mrg 
    932  1.10  mrg    <p><hr /><a name="nds32be-x-elf"></a>
    933  1.10  mrg 
    934  1.10  mrg <h3 class="heading"><a name="TOC39"></a>nds32be-*-elf</h3>
    935  1.10  mrg 
    936   1.5  mrg <p>Andes NDS32 target in big endian mode.
    937  1.10  mrg 
    938  1.10  mrg    <p><hr /><a name="nvptx-x-none"></a>
    939  1.10  mrg 
    940  1.10  mrg <h3 class="heading"><a name="TOC40"></a>nvptx-*-none</h3>
    941  1.10  mrg 
    942   1.5  mrg <p>Nvidia PTX target.
    943  1.10  mrg 
    944  1.10  mrg    <p>Instead of GNU binutils, you will need to install
    945  1.10  mrg <a href="https://github.com/MentorEmbedded/nvptx-tools/">nvptx-tools</a>. 
    946   1.5  mrg Tell GCC where to find it:
    947  1.10  mrg <samp><span class="option">--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</span></samp>.
    948  1.10  mrg 
    949  1.10  mrg    <p>A nvptx port of newlib is available at
    950  1.10  mrg <a href="https://github.com/MentorEmbedded/nvptx-newlib/">nvptx-newlib</a>. 
    951   1.5  mrg It can be automatically built together with GCC.  For this, add a
    952  1.10  mrg symbolic link to nvptx-newlib's <samp><span class="file">newlib</span></samp> directory to the
    953   1.5  mrg directory containing the GCC sources.
    954  1.10  mrg 
    955  1.10  mrg    <p>Use the <samp><span class="option">--disable-sjlj-exceptions</span></samp> and
    956  1.10  mrg <samp><span class="option">--enable-newlib-io-long-long</span></samp> options when configuring.
    957  1.10  mrg 
    958  1.10  mrg    <p><hr /><a name="powerpc-x-x"></a>
    959  1.10  mrg 
    960  1.10  mrg <h3 class="heading"><a name="TOC41"></a>powerpc-*-*</h3>
    961  1.10  mrg 
    962  1.10  mrg <p>You can specify a default version for the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    963  1.10  mrg switch by using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    964  1.10  mrg 
    965  1.10  mrg    <p>You will need GNU binutils 2.15 or newer.
    966  1.10  mrg 
    967  1.10  mrg    <p><hr /><a name="powerpc-x-darwin"></a>
    968  1.10  mrg 
    969  1.10  mrg <h3 class="heading"><a name="TOC42"></a>powerpc-*-darwin*</h3>
    970  1.10  mrg 
    971   1.1  mrg <p>PowerPC running Darwin (Mac OS X kernel).
    972  1.10  mrg 
    973  1.10  mrg    <p>Pre-installed versions of Mac OS X may not include any developer tools,
    974   1.1  mrg meaning that you will not be able to build GCC from source.  Tool
    975   1.1  mrg binaries are available at
    976  1.10  mrg <a href="https://opensource.apple.com">https://opensource.apple.com</a>.
    977  1.10  mrg 
    978  1.10  mrg    <p>This version of GCC requires at least cctools-590.36.  The
    979   1.1  mrg cctools-590.36 package referenced from
    980   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
    981   1.1  mrg on systems older than 10.3.9 (aka darwin7.9.0).
    982  1.10  mrg 
    983  1.10  mrg    <p><hr /><a name="powerpc-x-elf"></a>
    984  1.10  mrg 
    985  1.10  mrg <h3 class="heading"><a name="TOC43"></a>powerpc-*-elf</h3>
    986  1.10  mrg 
    987   1.1  mrg <p>PowerPC system in big endian mode, running System V.4.
    988  1.10  mrg 
    989  1.10  mrg    <p><hr /><a name="powerpc-x-linux-gnu"></a>
    990  1.10  mrg 
    991  1.10  mrg <h3 class="heading"><a name="TOC44"></a>powerpc*-*-linux-gnu*</h3>
    992  1.10  mrg 
    993   1.1  mrg <p>PowerPC system in big endian mode running Linux.
    994  1.10  mrg 
    995  1.10  mrg    <p><hr /><a name="powerpc-x-netbsd"></a>
    996  1.10  mrg 
    997  1.10  mrg <h3 class="heading"><a name="TOC45"></a>powerpc-*-netbsd*</h3>
    998  1.10  mrg 
    999   1.1  mrg <p>PowerPC system in big endian mode running NetBSD.
   1000  1.10  mrg 
   1001  1.10  mrg    <p><hr /><a name="powerpc-x-eabisim"></a>
   1002  1.10  mrg 
   1003  1.10  mrg <h3 class="heading"><a name="TOC46"></a>powerpc-*-eabisim</h3>
   1004  1.10  mrg 
   1005   1.1  mrg <p>Embedded PowerPC system in big endian mode for use in running under the
   1006   1.1  mrg PSIM simulator.
   1007  1.10  mrg 
   1008  1.10  mrg    <p><hr /><a name="powerpc-x-eabi"></a>
   1009  1.10  mrg 
   1010  1.10  mrg <h3 class="heading"><a name="TOC47"></a>powerpc-*-eabi</h3>
   1011  1.10  mrg 
   1012   1.1  mrg <p>Embedded PowerPC system in big endian mode.
   1013  1.10  mrg 
   1014  1.10  mrg    <p><hr /><a name="powerpcle-x-elf"></a>
   1015  1.10  mrg 
   1016  1.10  mrg <h3 class="heading"><a name="TOC48"></a>powerpcle-*-elf</h3>
   1017  1.10  mrg 
   1018   1.1  mrg <p>PowerPC system in little endian mode, running System V.4.
   1019  1.10  mrg 
   1020  1.10  mrg    <p><hr /><a name="powerpcle-x-eabisim"></a>
   1021  1.10  mrg 
   1022  1.10  mrg <h3 class="heading"><a name="TOC49"></a>powerpcle-*-eabisim</h3>
   1023  1.10  mrg 
   1024   1.1  mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1025   1.1  mrg the PSIM simulator.
   1026  1.10  mrg 
   1027  1.10  mrg    <p><hr /><a name="powerpcle-x-eabi"></a>
   1028  1.10  mrg 
   1029  1.10  mrg <h3 class="heading"><a name="TOC50"></a>powerpcle-*-eabi</h3>
   1030  1.10  mrg 
   1031   1.1  mrg <p>Embedded PowerPC system in little endian mode.
   1032  1.10  mrg 
   1033  1.10  mrg    <p><hr /><a name="rl78-x-elf"></a>
   1034  1.10  mrg 
   1035  1.10  mrg <h3 class="heading"><a name="TOC51"></a>rl78-*-elf</h3>
   1036  1.10  mrg 
   1037  1.10  mrg <p>The Renesas RL78 processor. 
   1038   1.3  mrg This configuration is intended for embedded systems.
   1039  1.10  mrg 
   1040  1.10  mrg    <p><hr /><a name="riscv32-x-elf"></a>
   1041  1.10  mrg 
   1042  1.10  mrg <h3 class="heading"><a name="TOC52"></a>riscv32-*-elf</h3>
   1043  1.10  mrg 
   1044  1.10  mrg <p>The RISC-V RV32 instruction set. 
   1045  1.10  mrg This configuration is intended for embedded systems. 
   1046  1.10  mrg This (and all other RISC-V) targets are supported upstream as of the
   1047  1.10  mrg binutils 2.28 release.
   1048  1.10  mrg 
   1049  1.10  mrg    <p><hr /><a name="riscv32-x-linux"></a>
   1050  1.10  mrg 
   1051  1.10  mrg <h3 class="heading"><a name="TOC53"></a>riscv32-*-linux</h3>
   1052  1.10  mrg 
   1053  1.10  mrg <p>The RISC-V RV32 instruction set running GNU/Linux. 
   1054  1.10  mrg This (and all other RISC-V) targets are supported upstream as of the
   1055  1.10  mrg binutils 2.28 release.
   1056  1.10  mrg 
   1057  1.10  mrg    <p><hr /><a name="riscv64-x-elf"></a>
   1058  1.10  mrg 
   1059  1.10  mrg <h3 class="heading"><a name="TOC54"></a>riscv64-*-elf</h3>
   1060  1.10  mrg 
   1061  1.10  mrg <p>The RISC-V RV64 instruction set. 
   1062  1.10  mrg This configuration is intended for embedded systems. 
   1063  1.10  mrg This (and all other RISC-V) targets are supported upstream as of the
   1064  1.10  mrg binutils 2.28 release.
   1065  1.10  mrg 
   1066  1.10  mrg    <p><hr /><a name="riscv64-x-linux"></a>
   1067  1.10  mrg 
   1068  1.10  mrg <h3 class="heading"><a name="TOC55"></a>riscv64-*-linux</h3>
   1069  1.10  mrg 
   1070  1.10  mrg <p>The RISC-V RV64 instruction set running GNU/Linux. 
   1071  1.10  mrg This (and all other RISC-V) targets are supported upstream as of the
   1072  1.10  mrg binutils 2.28 release.
   1073  1.10  mrg 
   1074  1.10  mrg    <p><hr /><a name="rx-x-elf"></a>
   1075  1.10  mrg 
   1076  1.10  mrg <h3 class="heading"><a name="TOC56"></a>rx-*-elf</h3>
   1077  1.10  mrg 
   1078  1.10  mrg <p>The Renesas RX processor.
   1079  1.10  mrg 
   1080  1.10  mrg    <p><hr /><a name="s390-x-linux"></a>
   1081  1.10  mrg 
   1082  1.10  mrg <h3 class="heading"><a name="TOC57"></a>s390-*-linux*</h3>
   1083  1.10  mrg 
   1084   1.1  mrg <p>S/390 system running GNU/Linux for S/390.
   1085  1.10  mrg 
   1086  1.10  mrg    <p><hr /><a name="s390x-x-linux"></a>
   1087  1.10  mrg 
   1088  1.10  mrg <h3 class="heading"><a name="TOC58"></a>s390x-*-linux*</h3>
   1089  1.10  mrg 
   1090   1.1  mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1091  1.10  mrg 
   1092  1.10  mrg    <p><hr /><a name="s390x-ibm-tpf"></a>
   1093  1.10  mrg 
   1094  1.10  mrg <h3 class="heading"><a name="TOC59"></a>s390x-ibm-tpf*</h3>
   1095  1.10  mrg 
   1096   1.1  mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1097   1.1  mrg supported as cross-compilation target only.
   1098  1.10  mrg 
   1099  1.10  mrg    <p><hr /><!-- Please use Solaris 2 to refer to all release of Solaris, starting -->
   1100  1.10  mrg <!-- with 2.0 until 2.6, 7, 8, etc.  Solaris 1 was a marketing name for -->
   1101  1.10  mrg <!-- SunOS 4 releases which we don't use to avoid confusion.  Solaris -->
   1102  1.10  mrg <!-- alone is too unspecific and must be avoided. -->
   1103  1.10  mrg <a name="x-x-solaris2"></a>
   1104  1.10  mrg 
   1105  1.10  mrg <h3 class="heading"><a name="TOC60"></a>*-*-solaris2*</h3>
   1106  1.10  mrg 
   1107   1.6  mrg <p>Support for Solaris 9 has been removed in GCC 5.  Support for Solaris
   1108   1.5  mrg 8 has been removed in GCC 4.8.  Support for Solaris 7 has been removed
   1109   1.5  mrg in GCC 4.6.
   1110  1.10  mrg 
   1111  1.10  mrg    <p>Sun does not ship a C compiler with Solaris 2 before Solaris 10, though
   1112   1.3  mrg you can download the Sun Studio compilers for free.  In Solaris 10 and
   1113  1.10  mrg 11, GCC 3.4.3 is available as <samp><span class="command">/usr/sfw/bin/gcc</span></samp>.  Solaris 11
   1114   1.7  mrg also provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1115  1.10  mrg <samp><span class="command">/usr/gcc/4.5/bin/gcc</span></samp> or similar.  Alternatively,
   1116   1.1  mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1117   1.1  mrg <a href="binaries.html">binaries page</a> for details.
   1118   1.1  mrg 
   1119  1.10  mrg    <p>The Solaris 2 <samp><span class="command">/bin/sh</span></samp> will often fail to configure
   1120  1.10  mrg &lsquo;<samp><span class="samp">libstdc++-v3</span></samp>&rsquo;or &lsquo;<samp><span class="samp">boehm-gc</span></samp>&rsquo;.  We therefore recommend using the
   1121  1.10  mrg following initial sequence of commands
   1122  1.10  mrg 
   1123  1.10  mrg <pre class="smallexample">     % CONFIG_SHELL=/bin/ksh
   1124  1.10  mrg      % export CONFIG_SHELL
   1125  1.10  mrg </pre>
   1126  1.10  mrg    <p class="noindent">and proceed as described in <a href="configure.html">the configure instructions</a>. 
   1127   1.1  mrg In addition we strongly recommend specifying an absolute path to invoke
   1128  1.10  mrg <samp><var>srcdir</var><span class="command">/configure</span></samp>.
   1129  1.10  mrg 
   1130  1.10  mrg    <p>Solaris 10 comes with a number of optional OS packages.  Some of these
   1131   1.1  mrg are needed to use GCC fully, namely <code>SUNWarc</code>,
   1132   1.1  mrg <code>SUNWbtool</code>, <code>SUNWesu</code>, <code>SUNWhea</code>, <code>SUNWlibm</code>,
   1133   1.1  mrg <code>SUNWsprot</code>, and <code>SUNWtoo</code>.  If you did not install all
   1134   1.7  mrg optional packages when installing Solaris 10, you will need to verify that
   1135  1.10  mrg the packages that GCC needs are installed. 
   1136   1.7  mrg To check whether an optional package is installed, use
   1137  1.10  mrg the <samp><span class="command">pkginfo</span></samp> command.  To add an optional package, use the
   1138  1.10  mrg <samp><span class="command">pkgadd</span></samp> command.  For further details, see the Solaris 10
   1139   1.1  mrg documentation.
   1140  1.10  mrg 
   1141  1.10  mrg    <p>Starting with Solaris 11, the package management has changed, so you
   1142   1.7  mrg need to check for <code>system/header</code>, <code>system/linker</code>, and
   1143   1.7  mrg <code>developer/assembler</code> packages.  Checking for and installing
   1144  1.10  mrg packages is done with the <samp><span class="command">pkg</span></samp> command now.
   1145  1.10  mrg 
   1146  1.10  mrg    <p>Trying to use the linker and other tools in
   1147  1.10  mrg <samp><span class="file">/usr/ucb</span></samp> to install GCC has been observed to cause trouble. 
   1148   1.1  mrg For example, the linker may hang indefinitely.  The fix is to remove
   1149  1.10  mrg <samp><span class="file">/usr/ucb</span></samp> from your <samp><span class="env">PATH</span></samp>.
   1150  1.10  mrg 
   1151  1.10  mrg    <p>The build process works more smoothly with the legacy Sun tools so, if you
   1152  1.10  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
   1153  1.10  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.
   1154  1.10  mrg 
   1155  1.10  mrg    <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1156  1.10  mrg conjunction with the Solaris linker.  The GNU <samp><span class="command">as</span></samp>
   1157   1.7  mrg versions included in Solaris 10, from GNU binutils 2.15 (in
   1158  1.10  mrg <samp><span class="file">/usr/sfw/bin/gas</span></samp>), and Solaris 11,
   1159  1.10  mrg from GNU binutils 2.19 or newer (also in <samp><span class="file">/usr/bin/gas</span></samp> and
   1160  1.10  mrg <samp><span class="file">/usr/gnu/bin/as</span></samp>), are known to work. 
   1161   1.7  mrg Current versions of GNU binutils (2.26)
   1162   1.7  mrg are known to work as well, with the caveat mentioned in
   1163   1.7  mrg <a href="#ix86-x-solaris210">i?86-*-solaris2.10</a> .  Note that your mileage may vary
   1164   1.7  mrg if you use a combination of the GNU tools and the Solaris tools: while the
   1165  1.10  mrg combination GNU <samp><span class="command">as</span></samp> + Sun <samp><span class="command">ld</span></samp> should reasonably work,
   1166  1.10  mrg the reverse combination Sun <samp><span class="command">as</span></samp> + GNU <samp><span class="command">ld</span></samp> may fail to
   1167  1.10  mrg build or cause memory corruption at runtime in some cases for C++ programs. 
   1168  1.10  mrg <!-- FIXME: still? -->
   1169  1.10  mrg GNU <samp><span class="command">ld</span></samp> usually works as well, although the version included in
   1170   1.1  mrg Solaris 10 cannot be used due to several bugs.  Again, the current
   1171   1.7  mrg version (2.26) is known to work, but generally lacks platform specific
   1172  1.10  mrg features, so better stay with Solaris <samp><span class="command">ld</span></samp>.  To use the LTO linker
   1173  1.10  mrg plugin (<samp><span class="option">-fuse-linker-plugin</span></samp>) with GNU <samp><span class="command">ld</span></samp>, GNU
   1174  1.10  mrg binutils <em>must</em> be configured with <samp><span class="option">--enable-largefile</span></samp>.
   1175  1.10  mrg 
   1176  1.10  mrg    <p>To enable symbol versioning in &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; with the Solaris linker,
   1177  1.10  mrg you need to have any version of GNU <samp><span class="command">c++filt</span></samp>, which is part of
   1178  1.10  mrg GNU binutils.  &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; symbol versioning will be disabled if no
   1179  1.10  mrg appropriate version is found.  Solaris <samp><span class="command">c++filt</span></samp> from the Solaris
   1180   1.7  mrg Studio compilers does <em>not</em> work.
   1181  1.10  mrg 
   1182  1.10  mrg    <p>Sun bug 4927647 sometimes causes random spurious testsuite failures
   1183  1.10  mrg related to missing diagnostic output.  This bug doesn't affect GCC
   1184  1.10  mrg itself, rather it is a kernel bug triggered by the <samp><span class="command">expect</span></samp>
   1185   1.1  mrg program which is used only by the GCC testsuite driver.  When the bug
   1186  1.10  mrg causes the <samp><span class="command">expect</span></samp> program to miss anticipated output, extra
   1187   1.1  mrg testsuite failures appear.
   1188  1.10  mrg 
   1189  1.10  mrg    <p><hr /><a name="sparc-x-x"></a>
   1190  1.10  mrg 
   1191  1.10  mrg <h3 class="heading"><a name="TOC61"></a>sparc*-*-*</h3>
   1192  1.10  mrg 
   1193   1.3  mrg <p>This section contains general configuration information for all
   1194   1.3  mrg SPARC-based platforms.  In addition to reading this section, please
   1195   1.3  mrg read all other sections that match your target.
   1196  1.10  mrg 
   1197  1.10  mrg    <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1198   1.3  mrg library and the MPC library are known to be miscompiled by earlier
   1199   1.3  mrg versions of GCC on these platforms.  We therefore recommend the use
   1200   1.3  mrg of the exact versions of these libraries listed as minimal versions
   1201   1.3  mrg in <a href="prerequisites.html">the prerequisites</a>.
   1202  1.10  mrg 
   1203  1.10  mrg    <p><hr /><a name="sparc-sun-solaris2"></a>
   1204  1.10  mrg 
   1205  1.10  mrg <h3 class="heading"><a name="TOC62"></a>sparc-sun-solaris2*</h3>
   1206  1.10  mrg 
   1207   1.1  mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1208  1.10  mrg produced are smaller than the ones produced using Sun's native tools;
   1209   1.1  mrg this difference is quite significant for binaries containing debugging
   1210   1.1  mrg information.
   1211  1.10  mrg 
   1212  1.10  mrg    <p>Starting with Solaris 7, the operating system is capable of executing
   1213   1.1  mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1214  1.10  mrg this; the <samp><span class="option">-m64</span></samp> option enables 64-bit code generation. 
   1215   1.1  mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1216  1.10  mrg should try the <samp><span class="option">-mtune=ultrasparc</span></samp> option instead, which produces
   1217   1.1  mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1218   1.1  mrg machines.
   1219  1.10  mrg 
   1220  1.10  mrg    <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1221   1.3  mrg library or the MPC library on a Solaris 7 or later system, the canonical
   1222  1.10  mrg target triplet must be specified as the <samp><span class="command">build</span></samp> parameter on the
   1223  1.10  mrg 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
   1224   1.3  mrg not that of GMP or MPFR or MPC).  For example on a Solaris 9 system:
   1225  1.10  mrg 
   1226  1.10  mrg <pre class="smallexample">     % ./configure --build=sparc-sun-solaris2.9 --prefix=xxx
   1227  1.10  mrg </pre>
   1228  1.10  mrg    <p><hr /><a name="sparc-sun-solaris210"></a>
   1229  1.10  mrg 
   1230  1.10  mrg <h3 class="heading"><a name="TOC63"></a>sparc-sun-solaris2.10</h3>
   1231  1.10  mrg 
   1232   1.1  mrg <p>There is a bug in older versions of the Sun assembler which breaks
   1233   1.1  mrg thread-local storage (TLS).  A typical error message is
   1234  1.10  mrg 
   1235  1.10  mrg <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_TLS_LE_HIX22: file /var/tmp//ccamPA1v.o:
   1236  1.10  mrg        symbol &lt;unknown&gt;: bad symbol type SECT: symbol type must be TLS
   1237  1.10  mrg </pre>
   1238  1.10  mrg    <p class="noindent">This bug is fixed in Sun patch 118683-03 or later.
   1239  1.10  mrg 
   1240  1.10  mrg    <p><hr /><a name="sparc-x-linux"></a>
   1241  1.10  mrg 
   1242  1.10  mrg <h3 class="heading"><a name="TOC64"></a>sparc-*-linux*</h3>
   1243  1.10  mrg 
   1244  1.10  mrg <p><hr /><a name="sparc64-x-solaris2"></a>
   1245  1.10  mrg 
   1246  1.10  mrg <h3 class="heading"><a name="TOC65"></a>sparc64-*-solaris2*</h3>
   1247  1.10  mrg 
   1248   1.3  mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1249   1.3  mrg library or the MPC library, the canonical target triplet must be specified
   1250  1.10  mrg as the <samp><span class="command">build</span></samp> parameter on the configure line.  For example
   1251   1.3  mrg on a Solaris 9 system:
   1252  1.10  mrg 
   1253  1.10  mrg <pre class="smallexample">     % ./configure --build=sparc64-sun-solaris2.9 --prefix=xxx
   1254  1.10  mrg </pre>
   1255  1.10  mrg    <p><hr /><a name="sparcv9-x-solaris2"></a>
   1256  1.10  mrg 
   1257  1.10  mrg <h3 class="heading"><a name="TOC66"></a>sparcv9-*-solaris2*</h3>
   1258  1.10  mrg 
   1259  1.10  mrg <p>This is a synonym for &lsquo;<samp><span class="samp">sparc64-*-solaris2*</span></samp>&rsquo;.
   1260  1.10  mrg 
   1261  1.10  mrg    <p><hr /><a name="c6x-x-x"></a>
   1262  1.10  mrg 
   1263  1.10  mrg <h3 class="heading"><a name="TOC67"></a>c6x-*-*</h3>
   1264  1.10  mrg 
   1265   1.3  mrg <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1266  1.10  mrg 
   1267  1.10  mrg    <p><hr /><a name="tilegx-*-linux"></a>
   1268  1.10  mrg 
   1269  1.10  mrg <h3 class="heading"><a name="TOC68"></a>tilegx-*-linux*</h3>
   1270  1.10  mrg 
   1271   1.5  mrg <p>The TILE-Gx processor in little endian mode, running GNU/Linux.  This
   1272   1.5  mrg port requires binutils-2.22 or newer.
   1273  1.10  mrg 
   1274  1.10  mrg    <p><hr /><a name="tilegxbe-*-linux"></a>
   1275  1.10  mrg 
   1276  1.10  mrg <h3 class="heading"><a name="TOC69"></a>tilegxbe-*-linux*</h3>
   1277  1.10  mrg 
   1278   1.5  mrg <p>The TILE-Gx processor in big endian mode, running GNU/Linux.  This
   1279   1.5  mrg port requires binutils-2.23 or newer.
   1280  1.10  mrg 
   1281  1.10  mrg    <p><hr /><a name="tilepro-*-linux"></a>
   1282  1.10  mrg 
   1283  1.10  mrg <h3 class="heading"><a name="TOC70"></a>tilepro-*-linux*</h3>
   1284  1.10  mrg 
   1285   1.3  mrg <p>The TILEPro processor running GNU/Linux.  This port requires
   1286   1.3  mrg binutils-2.22 or newer.
   1287  1.10  mrg 
   1288  1.10  mrg    <p><hr /><a name="visium-x-elf"></a>
   1289  1.10  mrg 
   1290  1.10  mrg <h3 class="heading"><a name="TOC71"></a>visium-*-elf</h3>
   1291  1.10  mrg 
   1292  1.10  mrg <p>CDS VISIUMcore processor. 
   1293   1.5  mrg This configuration is intended for embedded systems.
   1294  1.10  mrg 
   1295  1.10  mrg    <p><hr /><a name="x-x-vxworks"></a>
   1296  1.10  mrg 
   1297  1.10  mrg <h3 class="heading"><a name="TOC72"></a>*-*-vxworks*</h3>
   1298  1.10  mrg 
   1299   1.1  mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1300  1.10  mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC. 
   1301  1.10  mrg We welcome patches for other architectures supported by VxWorks 5.5. 
   1302   1.1  mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1303   1.1  mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1304   1.1  mrg not interested in supporting older, a.out or COFF-based, versions of
   1305   1.1  mrg VxWorks in GCC 3.
   1306  1.10  mrg 
   1307  1.10  mrg    <p>VxWorks comes with an older version of GCC installed in
   1308  1.10  mrg <samp><var>$WIND_BASE</var><span class="file">/host</span></samp>; we recommend you do not overwrite it. 
   1309  1.10  mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>. 
   1310  1.10  mrg Before running <samp><span class="command">configure</span></samp>, create the directories <samp><var>prefix</var></samp>
   1311  1.10  mrg and <samp><var>prefix</var><span class="file">/bin</span></samp>.  Link or copy the appropriate assembler,
   1312  1.10  mrg linker, etc. into <samp><var>prefix</var><span class="file">/bin</span></samp>, and set your <var>PATH</var> to
   1313  1.10  mrg include that directory while running both <samp><span class="command">configure</span></samp> and
   1314  1.10  mrg <samp><span class="command">make</span></samp>.
   1315  1.10  mrg 
   1316  1.10  mrg    <p>You must give <samp><span class="command">configure</span></samp> the
   1317  1.10  mrg <samp><span class="option">--with-headers=</span><var>$WIND_BASE</var><span class="option">/target/h</span></samp> switch so that it can
   1318   1.1  mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1319  1.10  mrg target only, you must also specify <samp><span class="option">--target=</span><var>target</var></samp>. 
   1320  1.10  mrg <samp><span class="command">configure</span></samp> will attempt to create the directory
   1321  1.10  mrg <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> and copy files into it;
   1322  1.10  mrg make sure the user running <samp><span class="command">configure</span></samp> has sufficient privilege
   1323   1.1  mrg to do so.
   1324  1.10  mrg 
   1325  1.10  mrg    <p>GCC's exception handling runtime requires a special &ldquo;configlette&rdquo;
   1326  1.10  mrg module, <samp><span class="file">contrib/gthr_supp_vxw_5x.c</span></samp>.  Follow the instructions in
   1327   1.1  mrg that file to add the module to your kernel build.  (Future versions of
   1328   1.1  mrg VxWorks will incorporate this module.)
   1329  1.10  mrg 
   1330  1.10  mrg    <p><hr /><a name="x86-64-x-x"></a>
   1331  1.10  mrg 
   1332  1.10  mrg <h3 class="heading"><a name="TOC73"></a>x86_64-*-*, amd64-*-*</h3>
   1333  1.10  mrg 
   1334   1.1  mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1335  1.10  mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD. 
   1336   1.1  mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1337  1.10  mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp><span class="option">-m32</span></samp> switch).
   1338  1.10  mrg 
   1339  1.10  mrg    <p><hr /><a name="x86-64-x-solaris210"></a>
   1340  1.10  mrg 
   1341  1.10  mrg <h3 class="heading"><a name="TOC74"></a>x86_64-*-solaris2.1[0-9]*</h3>
   1342  1.10  mrg 
   1343   1.3  mrg <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1344  1.10  mrg 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
   1345   1.3  mrg Solaris 10 or later.  Unlike other systems, without special options a
   1346   1.3  mrg bi-arch compiler is built which generates 32-bit code by default, but
   1347  1.10  mrg can generate 64-bit x86-64 code with the <samp><span class="option">-m64</span></samp> switch.  Since
   1348   1.7  mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1349  1.10  mrg can generate 32-bit code with <samp><span class="option">-m32</span></samp>.  To configure and build
   1350  1.10  mrg this way, you have to provide all support libraries like <samp><span class="file">libgmp</span></samp>
   1351  1.10  mrg as 64-bit code, configure with <samp><span class="option">--target=x86_64-pc-solaris2.1x</span></samp>
   1352  1.10  mrg and &lsquo;<samp><span class="samp">CC=gcc -m64</span></samp>&rsquo;.
   1353  1.10  mrg 
   1354  1.10  mrg    <p><hr /><a name="xtensa-x-elf"></a>
   1355  1.10  mrg 
   1356  1.10  mrg <h3 class="heading"><a name="TOC75"></a>xtensa*-*-elf</h3>
   1357  1.10  mrg 
   1358   1.1  mrg <p>This target is intended for embedded Xtensa systems using the
   1359  1.10  mrg &lsquo;<samp><span class="samp">newlib</span></samp>&rsquo; C library.  It uses ELF but does not support shared
   1360   1.1  mrg objects.  Designed-defined instructions specified via the
   1361   1.1  mrg Tensilica Instruction Extension (TIE) language are only supported
   1362   1.1  mrg through inline assembly.
   1363  1.10  mrg 
   1364  1.10  mrg    <p>The Xtensa configuration information must be specified prior to
   1365  1.10  mrg building GCC.  The <samp><span class="file">include/xtensa-config.h</span></samp> header
   1366   1.1  mrg file contains the configuration information.  If you created your
   1367   1.1  mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1368   1.1  mrg downloaded files include a customized copy of this header file,
   1369   1.1  mrg which you can use to replace the default header file.
   1370  1.10  mrg 
   1371  1.10  mrg    <p><hr /><a name="xtensa-x-linux"></a>
   1372  1.10  mrg 
   1373  1.10  mrg <h3 class="heading"><a name="TOC76"></a>xtensa*-*-linux*</h3>
   1374  1.10  mrg 
   1375   1.1  mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1376   1.1  mrg shared objects and the GNU C library (glibc).  It also generates
   1377   1.1  mrg position-independent code (PIC) regardless of whether the
   1378  1.10  mrg <samp><span class="option">-fpic</span></samp> or <samp><span class="option">-fPIC</span></samp> options are used.  In other
   1379   1.1  mrg respects, this target is the same as the
   1380  1.10  mrg <a href="#xtensa*-*-elf">&lsquo;<samp><span class="samp">xtensa*-*-elf</span></samp>&rsquo;</a> target.
   1381  1.10  mrg 
   1382  1.10  mrg    <p><hr /><a name="windows"></a>
   1383  1.10  mrg 
   1384  1.10  mrg <h3 class="heading"><a name="TOC77"></a>Microsoft Windows</h3>
   1385  1.10  mrg 
   1386  1.10  mrg <h4 class="subheading"><a name="TOC78"></a>Intel 16-bit versions</h4>
   1387   1.1  mrg 
   1388   1.1  mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1389   1.1  mrg supported.
   1390  1.10  mrg 
   1391  1.10  mrg    <p>However, the 32-bit port has limited support for Microsoft
   1392   1.1  mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1393  1.10  mrg 
   1394  1.10  mrg <h4 class="subheading"><a name="TOC79"></a>Intel 32-bit versions</h4>
   1395  1.10  mrg 
   1396   1.1  mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1397   1.1  mrg XP, and Windows Vista, are supported by several different target
   1398   1.1  mrg platforms.  These targets differ in which Windows subsystem they target
   1399   1.1  mrg and which C libraries are used.
   1400   1.1  mrg 
   1401  1.10  mrg      <ul>
   1402  1.10  mrg <li>Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1403  1.10  mrg Linux API emulation layer in the Win32 subsystem. 
   1404  1.10  mrg <li>MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1405  1.10  mrg the Win32 subsystem that provides a subset of POSIX. 
   1406  1.10  mrg <li>MKS i386-pc-mks: NuTCracker from MKS.  See
   1407  1.10  mrg <a href="http://www.mkssoftware.com/">http://www.mkssoftware.com/</a> for more information. 
   1408  1.10  mrg </ul>
   1409  1.10  mrg 
   1410  1.10  mrg <h4 class="subheading"><a name="TOC80"></a>Intel 64-bit versions</h4>
   1411  1.10  mrg 
   1412   1.1  mrg <p>GCC contains support for x86-64 using the mingw-w64
   1413  1.10  mrg runtime library, available from <a href="http://mingw-w64.org/doku.php">http://mingw-w64.org/doku.php</a>. 
   1414   1.1  mrg This library should be used with the target triple x86_64-pc-mingw32.
   1415  1.10  mrg 
   1416  1.10  mrg    <p>Presently Windows for Itanium is not supported.
   1417  1.10  mrg 
   1418  1.10  mrg <h4 class="subheading"><a name="TOC81"></a>Windows CE</h4>
   1419  1.10  mrg 
   1420   1.3  mrg <p>Windows CE is supported as a target only on Hitachi
   1421   1.1  mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1422  1.10  mrg 
   1423  1.10  mrg <h4 class="subheading"><a name="TOC82"></a>Other Windows Platforms</h4>
   1424  1.10  mrg 
   1425   1.1  mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1426  1.10  mrg 
   1427  1.10  mrg    <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1428   1.1  mrg support the Interix subsystem.  See above.
   1429  1.10  mrg 
   1430  1.10  mrg    <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1431  1.10  mrg 
   1432  1.10  mrg    <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1433   1.1  mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1434  1.10  mrg 
   1435  1.10  mrg    <p>UWIN support has been removed due to a lack of maintenance.
   1436  1.10  mrg 
   1437  1.10  mrg    <p><hr /><a name="x-x-cygwin"></a>
   1438  1.10  mrg 
   1439  1.10  mrg <h3 class="heading"><a name="TOC83"></a>*-*-cygwin</h3>
   1440  1.10  mrg 
   1441   1.1  mrg <p>Ports of GCC are included with the
   1442   1.1  mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1443  1.10  mrg 
   1444  1.10  mrg    <p>GCC will build under Cygwin without modification; it does not build
   1445  1.10  mrg with Microsoft's C++ compiler and there are no plans to make it do so.
   1446  1.10  mrg 
   1447  1.10  mrg    <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1448   1.1  mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1449   1.1  mrg used with as up-to-date a version of binutils as possible; use either
   1450   1.1  mrg the latest official GNU binutils release in the Cygwin distribution,
   1451   1.1  mrg or version 2.20 or above if building your own.
   1452  1.10  mrg 
   1453  1.10  mrg    <p><hr /><a name="x-x-mingw32"></a>
   1454  1.10  mrg 
   1455  1.10  mrg <h3 class="heading"><a name="TOC84"></a>*-*-mingw32</h3>
   1456  1.10  mrg 
   1457  1.10  mrg <p>GCC will build with and support only MinGW runtime 3.12 and later. 
   1458   1.1  mrg Earlier versions of headers are incompatible with the new default semantics
   1459   1.1  mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1460  1.10  mrg 
   1461  1.10  mrg    <p><hr /><a name="older"></a>
   1462  1.10  mrg 
   1463  1.10  mrg <h3 class="heading"><a name="TOC85"></a>Older systems</h3>
   1464  1.10  mrg 
   1465   1.1  mrg <p>GCC contains support files for many older (1980s and early
   1466   1.1  mrg 1990s) Unix variants.  For the most part, support for these systems
   1467   1.1  mrg has not been deliberately removed, but it has not been maintained for
   1468   1.1  mrg several years and may suffer from bitrot.
   1469  1.10  mrg 
   1470  1.10  mrg    <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems. 
   1471   1.1  mrg Support for these systems is still present in that release, but
   1472  1.10  mrg <samp><span class="command">configure</span></samp> will fail unless the <samp><span class="option">--enable-obsolete</span></samp>
   1473   1.1  mrg option is given.  Unless a maintainer steps forward, support for these
   1474   1.1  mrg systems will be removed from the next release of GCC.
   1475  1.10  mrg 
   1476  1.10  mrg    <p>Support for old systems as hosts for GCC can cause problems if the
   1477   1.1  mrg workarounds for compiler, library and operating system bugs affect the
   1478   1.1  mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1479   1.1  mrg bring GCC up on such a system, if still possible with current GCC, may
   1480   1.1  mrg require first installing an old version of GCC which did work on that
   1481   1.1  mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1482   1.1  mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1483  1.10  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
   1484  1.10  mrg <samp><span class="command">fixincludes</span></samp>, but bugs or deficiencies in libraries and the
   1485   1.1  mrg operating system may still cause problems.
   1486  1.10  mrg 
   1487  1.10  mrg    <p>Support for older systems as targets for cross-compilation is less
   1488   1.1  mrg problematic than support for them as hosts for GCC; if an enthusiast
   1489   1.1  mrg wishes to make such a target work again (including resurrecting any of
   1490   1.1  mrg the targets that never worked with GCC 2, starting from the last
   1491   1.1  mrg version before they were removed), patches
   1492   1.1  mrg <a href="../contribute.html">following the usual requirements</a> would be
   1493   1.1  mrg likely to be accepted, since they should not affect the support for more
   1494   1.1  mrg modern targets.
   1495  1.10  mrg 
   1496  1.10  mrg    <p>For some systems, old versions of GNU binutils may also be useful,
   1497  1.10  mrg and are available from <samp><span class="file">pub/binutils/old-releases</span></samp> on
   1498  1.10  mrg <a href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1499  1.10  mrg 
   1500  1.10  mrg    <p>Some of the information on specific systems above relates to
   1501   1.1  mrg such older systems, but much of the information
   1502   1.1  mrg about GCC on such systems (which may no longer be applicable to
   1503   1.1  mrg current GCC) is to be found in the GCC texinfo manual.
   1504  1.10  mrg 
   1505  1.10  mrg    <p><hr /><a name="elf"></a>
   1506  1.10  mrg 
   1507  1.10  mrg <h3 class="heading"><a name="TOC86"></a>all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1508  1.10  mrg 
   1509   1.1  mrg <p>C++ support is significantly better on ELF targets if you use the
   1510   1.1  mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1511   1.1  mrg inlines, vtables and template instantiations will be discarded
   1512   1.1  mrg automatically.
   1513   1.1  mrg 
   1514  1.10  mrg    <p><hr />
   1515   1.1  mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1516   1.1  mrg 
   1517  1.10  mrg <!-- ***Old documentation****************************************************** -->
   1518  1.10  mrg <!-- ***GFDL******************************************************************** -->
   1519  1.10  mrg <!-- *************************************************************************** -->
   1520  1.10  mrg <!-- Part 6 The End of the Document -->
   1521  1.10  mrg </body></html>
   1522   1.1  mrg 
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