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     16   1.1    mrg (a) The FSF's Front-Cover Text is:
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     18  1.10    mrg A GNU Manual
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     22  1.10    mrg You have freedom to copy and modify this GNU Manual, like GNU
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     25  1.12    mrg <title>Host/Target specific installation notes for GCC</title>
     26  1.10    mrg 
     27  1.12    mrg <meta name="description" content="Host/Target specific installation notes for GCC">
     28  1.12    mrg <meta name="keywords" content="Host/Target specific installation notes for GCC">
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     46  1.10    mrg <body lang="en">
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     73  1.18    mrg 
     74  1.19    mrg <a class="index-entry-id" id="index-Specific"></a>
     75  1.19    mrg <a class="index-entry-id" id="index-Specific-installation-notes"></a>
     76  1.19    mrg <a class="index-entry-id" id="index-Target-specific-installation"></a>
     77  1.19    mrg <a class="index-entry-id" id="index-Host-specific-installation"></a>
     78  1.19    mrg <a class="index-entry-id" id="index-Target-specific-installation-notes"></a>
     79   1.6    mrg 
     80  1.19    mrg <p>Please read this document carefully <em class="emph">before</em> installing the
     81  1.10    mrg GNU Compiler Collection on your machine.
     82  1.10    mrg </p>
     83  1.19    mrg <p>Note that this list of install notes is <em class="emph">not</em> a list of supported
     84  1.10    mrg hosts or targets.  Not all supported hosts and targets are listed
     85  1.10    mrg here, only the ones that require host-specific or target-specific
     86  1.10    mrg information have to. 
     87  1.10    mrg </p>
     88  1.19    mrg <ul class="itemize mark-bullet">
     89  1.19    mrg <li><a class="uref" href="#aarch64-x-x">aarch64*-*-*</a>
     90  1.19    mrg </li><li><a class="uref" href="#amdgcn-x-amdhsa">amdgcn-*-amdhsa</a>
     91  1.19    mrg </li><li><a class="uref" href="#amd64-x-solaris2">amd64-*-solaris2*</a>
     92  1.19    mrg </li><li><a class="uref" href="#arc-x-elf32">arc-*-elf32</a>
     93  1.19    mrg </li><li><a class="uref" href="#arc-linux-uclibc">arc-linux-uclibc</a>
     94  1.19    mrg </li><li><a class="uref" href="#arm-x-eabi">arm-*-eabi</a>
     95  1.19    mrg </li><li><a class="uref" href="#avr">avr</a>
     96  1.19    mrg </li><li><a class="uref" href="#bfin">Blackfin</a>
     97  1.19    mrg </li><li><a class="uref" href="#cris">cris</a>
     98  1.19    mrg </li><li><a class="uref" href="#dos">DOS</a>
     99  1.19    mrg </li><li><a class="uref" href="#epiphany-x-elf">epiphany-*-elf</a>
    100  1.19    mrg </li><li><a class="uref" href="#ft32-x-elf">ft32-*-elf</a>
    101  1.19    mrg </li><li><a class="uref" href="#x-x-freebsd">*-*-freebsd*</a>
    102  1.19    mrg </li><li><a class="uref" href="#h8300-hms">h8300-hms</a>
    103  1.19    mrg </li><li><a class="uref" href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
    104  1.19    mrg </li><li><a class="uref" href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
    105  1.19    mrg </li><li><a class="uref" href="#x-x-linux-gnu">*-*-linux-gnu</a>
    106  1.19    mrg </li><li><a class="uref" href="#ix86-x-linux">i?86-*-linux*</a>
    107  1.19    mrg </li><li><a class="uref" href="#ix86-x-solaris2">i?86-*-solaris2*</a>
    108  1.19    mrg </li><li><a class="uref" href="#ia64-x-linux">ia64-*-linux</a>
    109  1.19    mrg </li><li><a class="uref" href="#ia64-x-hpux">ia64-*-hpux*</a>
    110  1.19    mrg </li><li><a class="uref" href="#x-ibm-aix">*-ibm-aix*</a>
    111  1.19    mrg </li><li><a class="uref" href="#iq2000-x-elf">iq2000-*-elf</a>
    112  1.19    mrg </li><li><a class="uref" href="#loongarch">loongarch</a>
    113  1.19    mrg </li><li><a class="uref" href="#lm32-x-elf">lm32-*-elf</a>
    114  1.19    mrg </li><li><a class="uref" href="#lm32-x-uclinux">lm32-*-uclinux</a>
    115  1.19    mrg </li><li><a class="uref" href="#m32c-x-elf">m32c-*-elf</a>
    116  1.19    mrg </li><li><a class="uref" href="#m32r-x-elf">m32r-*-elf</a>
    117  1.19    mrg </li><li><a class="uref" href="#m68k-x-x">m68k-*-*</a>
    118  1.19    mrg </li><li><a class="uref" href="#m68k-x-uclinux">m68k-*-uclinux</a>
    119  1.19    mrg </li><li><a class="uref" href="#microblaze-x-elf">microblaze-*-elf</a>
    120  1.19    mrg </li><li><a class="uref" href="#mips-x-x">mips-*-*</a>
    121  1.19    mrg </li><li><a class="uref" href="#moxie-x-elf">moxie-*-elf</a>
    122  1.19    mrg </li><li><a class="uref" href="#msp430-x-elf">msp430-*-elf</a>
    123  1.19    mrg </li><li><a class="uref" href="#nds32le-x-elf">nds32le-*-elf</a>
    124  1.19    mrg </li><li><a class="uref" href="#nds32be-x-elf">nds32be-*-elf</a>
    125  1.19    mrg </li><li><a class="uref" href="#nvptx-x-none">nvptx-*-none</a>
    126  1.19    mrg </li><li><a class="uref" href="#or1k-x-elf">or1k-*-elf</a>
    127  1.19    mrg </li><li><a class="uref" href="#or1k-x-linux">or1k-*-linux</a>
    128  1.19    mrg </li><li><a class="uref" href="#powerpc-x-x">powerpc*-*-*</a>
    129  1.19    mrg </li><li><a class="uref" href="#powerpc-x-darwin">powerpc-*-darwin*</a>
    130  1.19    mrg </li><li><a class="uref" href="#powerpc-x-elf">powerpc-*-elf</a>
    131  1.19    mrg </li><li><a class="uref" href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
    132  1.19    mrg </li><li><a class="uref" href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
    133  1.19    mrg </li><li><a class="uref" href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
    134  1.19    mrg </li><li><a class="uref" href="#powerpc-x-eabi">powerpc-*-eabi</a>
    135  1.19    mrg </li><li><a class="uref" href="#powerpcle-x-elf">powerpcle-*-elf</a>
    136  1.19    mrg </li><li><a class="uref" href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
    137  1.19    mrg </li><li><a class="uref" href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
    138  1.19    mrg </li><li><a class="uref" href="#riscv32-x-elf">riscv32-*-elf</a>
    139  1.19    mrg </li><li><a class="uref" href="#riscv32-x-linux">riscv32-*-linux</a>
    140  1.19    mrg </li><li><a class="uref" href="#riscv64-x-elf">riscv64-*-elf</a>
    141  1.19    mrg </li><li><a class="uref" href="#riscv64-x-linux">riscv64-*-linux</a>
    142  1.19    mrg </li><li><a class="uref" href="#rl78-x-elf">rl78-*-elf</a>
    143  1.19    mrg </li><li><a class="uref" href="#rx-x-elf">rx-*-elf</a>
    144  1.19    mrg </li><li><a class="uref" href="#s390-x-linux">s390-*-linux*</a>
    145  1.19    mrg </li><li><a class="uref" href="#s390x-x-linux">s390x-*-linux*</a>
    146  1.19    mrg </li><li><a class="uref" href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    147  1.19    mrg </li><li><a class="uref" href="#x-x-solaris2">*-*-solaris2*</a>
    148  1.19    mrg </li><li><a class="uref" href="#sparc-x-x">sparc*-*-*</a>
    149  1.19    mrg </li><li><a class="uref" href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    150  1.19    mrg </li><li><a class="uref" href="#sparc-x-linux">sparc-*-linux*</a>
    151  1.19    mrg </li><li><a class="uref" href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    152  1.19    mrg </li><li><a class="uref" href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    153  1.19    mrg </li><li><a class="uref" href="#c6x-x-x">c6x-*-*</a>
    154  1.19    mrg </li><li><a class="uref" href="#visium-x-elf">visium-*-elf</a>
    155  1.19    mrg </li><li><a class="uref" href="#x-x-vxworks">*-*-vxworks*</a>
    156  1.19    mrg </li><li><a class="uref" href="#x86-64-x-x">x86_64-*-*, amd64-*-*</a>
    157  1.19    mrg </li><li><a class="uref" href="#x86-64-x-solaris2">x86_64-*-solaris2*</a>
    158  1.19    mrg </li><li><a class="uref" href="#xtensa-x-elf">xtensa*-*-elf</a>
    159  1.19    mrg </li><li><a class="uref" href="#xtensa-x-linux">xtensa*-*-linux*</a>
    160  1.19    mrg </li><li><a class="uref" href="#windows">Microsoft Windows</a>
    161  1.19    mrg </li><li><a class="uref" href="#x-x-cygwin">*-*-cygwin</a>
    162  1.19    mrg </li><li><a class="uref" href="#x-x-mingw32">*-*-mingw32</a>
    163  1.19    mrg </li><li><a class="uref" href="#os2">OS/2</a>
    164  1.19    mrg </li><li><a class="uref" href="#older">Older systems</a>
    165  1.10    mrg </li></ul>
    166  1.10    mrg 
    167  1.19    mrg <ul class="itemize mark-bullet">
    168  1.19    mrg <li><a class="uref" href="#elf">all ELF targets</a> (SVR4, Solaris, etc.)
    169  1.10    mrg </li></ul>
    170  1.10    mrg 
    171  1.10    mrg 
    172  1.10    mrg <!-- -------- host/target specific issues start here ---------------- -->
    173  1.10    mrg <hr />
    174  1.19    mrg <a class="anchor" id="aarch64-x-x"></a><h3 class="heading" id="aarch64*-*-*"><span>aarch64*-*-*<a class="copiable-link" href="#aarch64*-*-*"> &para;</a></span></h3>
    175  1.19    mrg <p>Binutils pre 2.24 does not have support for selecting <samp class="option">-mabi</samp> and
    176  1.10    mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    177  1.19    mrg not support option <samp class="option">-mabi=ilp32</samp>.
    178  1.10    mrg </p>
    179  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    180  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    181  1.19    mrg <samp class="option">--enable-fix-cortex-a53-835769</samp> option.  This will enable the fix by
    182  1.10    mrg default and can be explicitly disabled during compilation by passing the
    183  1.19    mrg <samp class="option">-mno-fix-cortex-a53-835769</samp> option.  Conversely,
    184  1.19    mrg <samp class="option">--disable-fix-cortex-a53-835769</samp> will disable the workaround by
    185  1.10    mrg default.  The workaround is disabled by default if neither of
    186  1.19    mrg <samp class="option">--enable-fix-cortex-a53-835769</samp> or
    187  1.19    mrg <samp class="option">--disable-fix-cortex-a53-835769</samp> is given at configure time.
    188  1.10    mrg </p>
    189  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    190  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    191  1.19    mrg <samp class="option">--enable-fix-cortex-a53-843419</samp> option.  This workaround is applied at
    192  1.10    mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    193  1.10    mrg to the linker.  It can be explicitly disabled during compilation by passing the
    194  1.19    mrg <samp class="option">-mno-fix-cortex-a53-843419</samp> option.  Conversely,
    195  1.19    mrg <samp class="option">--disable-fix-cortex-a53-843419</samp> will disable the workaround by default.
    196  1.10    mrg The workaround is disabled by default if neither of
    197  1.19    mrg <samp class="option">--enable-fix-cortex-a53-843419</samp> or
    198  1.19    mrg <samp class="option">--disable-fix-cortex-a53-843419</samp> is given at configure time.
    199  1.10    mrg </p>
    200  1.11    mrg <p>To enable Branch Target Identification Mechanism and Return Address Signing by
    201  1.19    mrg default at configure time use the <samp class="option">--enable-standard-branch-protection</samp>
    202  1.19    mrg option.  This is equivalent to having <samp class="option">-mbranch-protection=standard</samp>
    203  1.11    mrg during compilation.  This can be explicitly disabled during compilation by
    204  1.19    mrg passing the <samp class="option">-mbranch-protection=none</samp> option which turns off all
    205  1.11    mrg types of branch protections.  Conversely,
    206  1.19    mrg <samp class="option">--disable-standard-branch-protection</samp> will disable both the
    207  1.11    mrg protections by default.  This mechanism is turned off by default if neither
    208  1.11    mrg of the options are given at configure time.
    209  1.11    mrg </p>
    210  1.10    mrg <hr />
    211  1.19    mrg <a class="anchor" id="amd64-x-solaris2"></a><h3 class="heading" id="amd64-*-solaris2*"><span>amd64-*-solaris2*<a class="copiable-link" href="#amd64-*-solaris2*"> &para;</a></span></h3>
    212  1.19    mrg <p>This is a synonym for &lsquo;<samp class="samp">x86_64-*-solaris2*</samp>&rsquo;.
    213  1.10    mrg </p>
    214  1.10    mrg <hr />
    215  1.19    mrg <a class="anchor" id="amdgcn-x-amdhsa"></a><h3 class="heading" id="amdgcn-*-amdhsa"><span>amdgcn-*-amdhsa<a class="copiable-link" href="#amdgcn-*-amdhsa"> &para;</a></span></h3>
    216  1.11    mrg <p>AMD GCN GPU target.
    217  1.11    mrg </p>
    218  1.18    mrg <p>Instead of GNU Binutils, you will need to install LLVM 15, or later, and copy
    219  1.19    mrg <samp class="file">bin/llvm-mc</samp> to <samp class="file">amdgcn-amdhsa/bin/as</samp>,
    220  1.19    mrg <samp class="file">bin/lld</samp> to <samp class="file">amdgcn-amdhsa/bin/ld</samp>,
    221  1.19    mrg <samp class="file">bin/llvm-nm</samp> to <samp class="file">amdgcn-amdhsa/bin/nm</samp>, and
    222  1.19    mrg <samp class="file">bin/llvm-ar</samp> to both <samp class="file">bin/amdgcn-amdhsa-ar</samp> and
    223  1.19    mrg <samp class="file">bin/amdgcn-amdhsa-ranlib</samp>.  Note that LLVM 13.0.1 or LLVM 14 can be used
    224  1.19    mrg by specifying a <code class="code">--with-multilib-list=</code> that does not list <code class="code">gfx1100</code>
    225  1.19    mrg and <code class="code">gfx1103</code>.
    226  1.18    mrg </p>
    227  1.18    mrg <p>Use Newlib (4.3.0 or newer; 4.4.0 contains some improvements and git commit
    228  1.18    mrg 7dd4eb1db (2025-03-25, post-4.4.0) fixes device console output for GFX10 and
    229  1.18    mrg GFX11 devices).
    230  1.11    mrg </p>
    231  1.11    mrg <p>To run the binaries, install the HSA Runtime from the
    232  1.19    mrg <a class="uref" href="https://rocm.docs.amd.com/">ROCm Platform</a>, and use
    233  1.19    mrg <samp class="file">libexec/gcc/amdhsa-amdhsa/<var class="var">version</var>/gcn-run</samp> to launch them
    234  1.11    mrg on the GPU.
    235  1.11    mrg </p>
    236  1.18    mrg <p>To enable support for GCN3 Fiji devices (gfx803), GCC has to be configured with
    237  1.19    mrg <samp class="option">--with-arch=<code class="code">fiji</code></samp> or
    238  1.19    mrg <samp class="option">--with-multilib-list=<code class="code">fiji</code>,...</samp>.  Note that support for Fiji
    239  1.18    mrg devices has been removed in ROCm 4.0 and support in LLVM was deprecated and has
    240  1.18    mrg been removed in LLVM 18.
    241  1.18    mrg </p>
    242  1.11    mrg <hr />
    243  1.19    mrg <a class="anchor" id="arc-x-elf32"></a><h3 class="heading" id="arc-*-elf32"><span>arc-*-elf32<a class="copiable-link" href="#arc-*-elf32"> &para;</a></span></h3>
    244  1.10    mrg 
    245  1.19    mrg <p>Use &lsquo;<samp class="samp">configure --target=arc-elf32 --with-cpu=<var class="var">cpu</var> --enable-languages=&quot;c,c++&quot;</samp>&rsquo;
    246  1.19    mrg to configure GCC, with <var class="var">cpu</var> being one of &lsquo;<samp class="samp">arc600</samp>&rsquo;, &lsquo;<samp class="samp">arc601</samp>&rsquo;,
    247  1.19    mrg or &lsquo;<samp class="samp">arc700</samp>&rsquo;.
    248  1.10    mrg </p>
    249  1.10    mrg <hr />
    250  1.19    mrg <a class="anchor" id="arc-linux-uclibc"></a><h3 class="heading" id="arc-linux-uclibc-1"><span>arc-linux-uclibc<a class="copiable-link" href="#arc-linux-uclibc-1"> &para;</a></span></h3>
    251  1.10    mrg 
    252  1.19    mrg <p>Use &lsquo;<samp class="samp">configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages=&quot;c,c++&quot;</samp>&rsquo; to configure GCC.
    253  1.10    mrg </p>
    254  1.10    mrg <hr />
    255  1.19    mrg <a class="anchor" id="arm-x-eabi"></a><h3 class="heading" id="arm-*-eabi"><span>arm-*-eabi<a class="copiable-link" href="#arm-*-eabi"> &para;</a></span></h3>
    256   1.9    mrg <p>ARM-family processors.
    257  1.10    mrg </p>
    258  1.10    mrg <p>Building the Ada frontend commonly fails (an infinite loop executing
    259  1.19    mrg <code class="code">xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    260   1.7    mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    261  1.10    mrg </p>
    262  1.10    mrg <hr />
    263  1.19    mrg <a class="anchor" id="avr"></a><h3 class="heading" id="avr-1"><span>avr<a class="copiable-link" href="#avr-1"> &para;</a></span></h3>
    264   1.1    mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    265  1.10    mrg applications.  There are no standard Unix configurations.
    266   1.1    mrg See &ldquo;AVR Options&rdquo; in the main manual
    267   1.1    mrg for the list of supported MCU types.
    268  1.10    mrg </p>
    269  1.19    mrg <p>Use &lsquo;<samp class="samp">configure --target=avr --enable-languages=&quot;c&quot;</samp>&rsquo; to configure GCC.
    270  1.10    mrg </p>
    271  1.10    mrg <p>Further installation notes and other useful information about AVR tools
    272   1.1    mrg can also be obtained from:
    273  1.10    mrg </p>
    274  1.19    mrg <ul class="itemize mark-bullet">
    275  1.19    mrg <li><a class="uref" href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    276  1.19    mrg </li><li><a class="uref" href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    277  1.10    mrg </li></ul>
    278  1.10    mrg 
    279  1.10    mrg <p>The following error:
    280  1.19    mrg </p><div class="example smallexample">
    281  1.19    mrg <pre class="example-preformatted">Error: register required
    282  1.10    mrg </pre></div>
    283  1.10    mrg 
    284  1.10    mrg <p>indicates that you should upgrade to a newer version of the binutils.
    285  1.10    mrg </p>
    286  1.10    mrg <hr />
    287  1.19    mrg <a class="anchor" id="bfin"></a><h3 class="heading" id="Blackfin"><span>Blackfin<a class="copiable-link" href="#Blackfin"> &para;</a></span></h3>
    288  1.10    mrg <p>The Blackfin processor, an Analog Devices DSP.
    289   1.1    mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    290  1.10    mrg </p>
    291  1.10    mrg <p>More information, and a version of binutils with support for this processor,
    292  1.19    mrg are available at <a class="uref" href="https://sourceforge.net/projects/adi-toolchain/">https://sourceforge.net/projects/adi-toolchain/</a>.
    293  1.10    mrg </p>
    294  1.10    mrg <hr />
    295  1.19    mrg <a class="anchor" id="cris"></a><h3 class="heading" id="CRIS"><span>CRIS<a class="copiable-link" href="#CRIS"> &para;</a></span></h3>
    296  1.15    mrg <p>CRIS is a CPU architecture in Axis Communications systems-on-a-chip, for
    297  1.15    mrg example the ETRAX series.  These are used in embedded applications.
    298  1.10    mrg </p>
    299  1.10    mrg <p>See &ldquo;CRIS Options&rdquo; in the main manual
    300   1.1    mrg for a list of CRIS-specific options.
    301  1.10    mrg </p>
    302  1.19    mrg <p>Use &lsquo;<samp class="samp">configure --target=cris-elf</samp>&rsquo; to configure GCC&nbsp;for building
    303  1.15    mrg a cross-compiler for CRIS.
    304  1.10    mrg <hr />
    305  1.19    mrg <a class="anchor" id="dos"></a></p><h3 class="heading" id="DOS"><span>DOS<a class="copiable-link" href="#DOS"> &para;</a></span></h3>
    306  1.19    mrg <p>Please have a look at the <a class="uref" href="binaries.html">binaries page</a>.
    307  1.10    mrg </p>
    308  1.10    mrg <p>You cannot install GCC by itself on MSDOS; it will not compile under
    309   1.1    mrg any MSDOS compiler except itself.  You need to get the complete
    310   1.1    mrg compilation package DJGPP, which includes binaries as well as sources,
    311   1.1    mrg and includes all the necessary compilation tools and libraries.
    312  1.10    mrg </p>
    313  1.10    mrg <hr />
    314  1.19    mrg <a class="anchor" id="epiphany-x-elf"></a><h3 class="heading" id="epiphany-*-elf"><span>epiphany-*-elf<a class="copiable-link" href="#epiphany-*-elf"> &para;</a></span></h3>
    315  1.10    mrg <p>Adapteva Epiphany.
    316   1.3  skrll This configuration is intended for embedded systems.
    317  1.10    mrg </p>
    318  1.10    mrg <hr />
    319  1.19    mrg <a class="anchor" id="x-x-freebsd"></a><h3 class="heading" id="g_t*-*-freebsd*"><span>*-*-freebsd*<a class="copiable-link" href="#g_t*-*-freebsd*"> &para;</a></span></h3>
    320  1.10    mrg <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    321  1.18    mrg for all CPU architectures.  There are
    322   1.1    mrg no known issues with mixing object files and libraries with different
    323  1.18    mrg debugging formats.
    324  1.18    mrg </p>
    325  1.18    mrg <p>We recommend bootstrapping against the latest GNU binutils or the
    326  1.19    mrg version found in the <samp class="file">devel/binutils</samp> port. This also has been
    327  1.18    mrg known to enable additional features and improve overall testsuite
    328  1.18    mrg results.
    329  1.18    mrg </p>
    330  1.18    mrg <p>Ada and D (or rather their respective libraries) are broken on
    331  1.18    mrg FreeBSD/i386. This also affects building 32-bit libraries on
    332  1.19    mrg FreeBSD/amd64, so configure with <samp class="option">--disable-multilib</samp>
    333  1.18    mrg there in case you are building one of these front ends.
    334  1.18    mrg </p>
    335  1.18    mrg <p>Go (or rather libgo) is generally broken on FreeBSD.
    336  1.10    mrg </p>
    337  1.10    mrg <hr />
    338  1.19    mrg <a class="anchor" id="ft32-x-elf"></a><h3 class="heading" id="ft32-*-elf"><span>ft32-*-elf<a class="copiable-link" href="#ft32-*-elf"> &para;</a></span></h3>
    339  1.10    mrg <p>The FT32 processor.
    340   1.7    mrg This configuration is intended for embedded systems.
    341  1.10    mrg </p>
    342  1.10    mrg <hr />
    343  1.19    mrg <a class="anchor" id="h8300-hms"></a><h3 class="heading" id="h8300-hms-1"><span>h8300-hms<a class="copiable-link" href="#h8300-hms-1"> &para;</a></span></h3>
    344   1.1    mrg <p>Renesas H8/300 series of processors.
    345  1.10    mrg </p>
    346  1.19    mrg <p>Please have a look at the <a class="uref" href="binaries.html">binaries page</a>.
    347  1.10    mrg </p>
    348  1.10    mrg <p>The calling convention and structure layout has changed in release 2.6.
    349   1.1    mrg All code must be recompiled.  The calling convention now passes the
    350   1.1    mrg first three arguments in function calls in registers.  Structures are no
    351   1.1    mrg longer a multiple of 2 bytes.
    352  1.10    mrg </p>
    353  1.10    mrg <hr />
    354  1.19    mrg <a class="anchor" id="hppa-hp-hpux"></a><h3 class="heading" id="hppa*-hp-hpux*"><span>hppa*-hp-hpux*<a class="copiable-link" href="#hppa*-hp-hpux*"> &para;</a></span></h3>
    355  1.18    mrg <p>We require using gas on all hppa platforms.  Version 2.19 or
    356   1.1    mrg later is recommended.
    357  1.10    mrg </p>
    358  1.10    mrg <p>It may be helpful to configure GCC with the
    359  1.19    mrg <a class="uref" href="./configure.html#with-gnu-as"><samp class="option">--with-gnu-as</samp></a> and
    360  1.19    mrg <samp class="option">--with-as=&hellip;</samp> options to ensure that GCC can find GAS.
    361  1.10    mrg </p>
    362  1.10    mrg <p>There are two default scheduling models for instructions.  These are
    363   1.1    mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    364  1.10    mrg architecture specified for the target machine when configuring.
    365   1.1    mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    366  1.19    mrg the target is a &lsquo;<samp class="samp">hppa1*</samp>&rsquo; machine.
    367  1.10    mrg </p>
    368  1.10    mrg <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    369   1.1    mrg it is important to completely specify the machine architecture when
    370   1.1    mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    371   1.1    mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    372   1.1    mrg default scheduling model is desired.
    373  1.10    mrg </p>
    374  1.10    mrg <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    375  1.10    mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
    376   1.1    mrg This namespace change might cause problems when bootstrapping with
    377   1.1    mrg an earlier version of GCC or the HP compiler as essentially the same
    378   1.1    mrg namespace is required for an entire build.  This problem can be avoided
    379  1.19    mrg in a number of ways.  With HP cc, <code class="env">UNIX_STD</code> can be set to &lsquo;<samp class="samp">95</samp>&rsquo;
    380  1.19    mrg or &lsquo;<samp class="samp">98</samp>&rsquo;.  Another way is to add an appropriate set of predefines
    381  1.19    mrg to <code class="env">CC</code>.  The description for the <samp class="option">munix=</samp> option contains
    382   1.1    mrg a list of the predefines used with each standard.
    383  1.10    mrg </p>
    384  1.19    mrg <p>More specific information to &lsquo;<samp class="samp">hppa*-hp-hpux*</samp>&rsquo; targets follows.
    385  1.10    mrg </p>
    386  1.10    mrg <hr />
    387  1.19    mrg <a class="anchor" id="hppa-hp-hpux11"></a><h3 class="heading" id="hppa*-hp-hpux11"><span>hppa*-hp-hpux11<a class="copiable-link" href="#hppa*-hp-hpux11"> &para;</a></span></h3>
    388  1.19    mrg <p>Refer to <a class="uref" href="binaries.html">binaries</a> for information about obtaining
    389   1.1    mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    390   1.9    mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    391   1.1    mrg only available for the 32-bit PA-RISC runtime.
    392  1.10    mrg </p>
    393  1.10    mrg <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    394  1.10    mrg bundled compiler supports only traditional C; you will need either HP&rsquo;s
    395   1.1    mrg unbundled compiler, or a binary distribution of GCC.
    396  1.10    mrg </p>
    397  1.10    mrg <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    398   1.1    mrg but the process requires several steps.  GCC 3.3 can then be used to
    399   1.9    mrg build later versions.
    400  1.10    mrg </p>
    401  1.10    mrg <p>There are several possible approaches to building the distribution.
    402   1.1    mrg Binutils can be built first using the HP tools.  Then, the GCC
    403   1.1    mrg distribution can be built.  The second approach is to build GCC
    404  1.10    mrg first using the HP tools, then build binutils, then rebuild GCC.
    405   1.1    mrg There have been problems with various binary distributions, so it
    406   1.1    mrg is best not to start from a binary distribution.
    407  1.10    mrg </p>
    408  1.10    mrg <p>On 64-bit capable systems, there are two distinct targets.  Different
    409   1.1    mrg installation prefixes must be used if both are to be installed on
    410  1.19    mrg the same system.  The &lsquo;<samp class="samp">hppa[1-2]*-hp-hpux11*</samp>&rsquo; target generates code
    411  1.10    mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker.
    412  1.19    mrg The &lsquo;<samp class="samp">hppa64-hp-hpux11*</samp>&rsquo; target generates 64-bit code for the
    413   1.1    mrg PA-RISC 2.0 architecture.
    414  1.10    mrg </p>
    415  1.10    mrg <p>The script config.guess now selects the target type based on the compiler
    416  1.19    mrg detected during configuration.  You must define <code class="env">PATH</code> or <code class="env">CC</code> so
    417  1.10    mrg that configure finds an appropriate compiler for the initial bootstrap.
    418  1.19    mrg When <code class="env">CC</code> is used, the definition should contain the options that are
    419  1.19    mrg needed whenever <code class="env">CC</code> is used.
    420  1.10    mrg </p>
    421  1.10    mrg <p>Specifically, options that determine the runtime architecture must be
    422  1.19    mrg in <code class="env">CC</code> to correctly select the target for the build.  It is also
    423  1.19    mrg convenient to place many other compiler options in <code class="env">CC</code>.  For example,
    424  1.19    mrg <code class="env">CC=&quot;cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE&quot;</code>
    425   1.1    mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    426  1.19    mrg 64-bit K&amp;R/bundled mode.  The <samp class="option">+DA2.0W</samp> option will result in
    427  1.19    mrg the automatic selection of the &lsquo;<samp class="samp">hppa64-hp-hpux11*</samp>&rsquo; target.  The
    428   1.1    mrg macro definition table of cpp needs to be increased for a successful
    429   1.1    mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    430   1.1    mrg be defined when building with the bundled compiler, or when using the
    431  1.19    mrg <samp class="option">-Ac</samp> option.  These defines aren&rsquo;t necessary with <samp class="option">-Ae</samp>.
    432  1.10    mrg </p>
    433  1.19    mrg <p>It is best to explicitly configure the &lsquo;<samp class="samp">hppa64-hp-hpux11*</samp>&rsquo; target
    434  1.19    mrg with the <samp class="option">--with-ld=&hellip;</samp> option.  This overrides the standard
    435   1.1    mrg search for ld.  The two linkers supported on this target require different
    436   1.1    mrg commands.  The default linker is determined during configuration.  As a
    437  1.10    mrg result, it&rsquo;s not possible to switch linkers in the middle of a GCC build.
    438   1.1    mrg This has been reported to sometimes occur in unified builds of binutils
    439   1.1    mrg and GCC.
    440  1.10    mrg </p>
    441  1.10    mrg <p>A recent linker patch must be installed for the correct operation of
    442  1.19    mrg GCC 3.3 and later.  <code class="code">PHSS_26559</code> and <code class="code">PHSS_24304</code> are the
    443   1.1    mrg oldest linker patches that are known to work.  They are for HP-UX
    444  1.19    mrg 11.00 and 11.11, respectively.  <code class="code">PHSS_24303</code>, the companion to
    445  1.19    mrg <code class="code">PHSS_24304</code>, might be usable but it hasn&rsquo;t been tested.  These
    446   1.1    mrg patches have been superseded.  Consult the HP patch database to obtain
    447   1.1    mrg the currently recommended linker patch for your system.
    448  1.10    mrg </p>
    449  1.10    mrg <p>The patches are necessary for the support of weak symbols on the
    450   1.1    mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    451   1.1    mrg symbols are implemented using SOM secondary definition symbols.  Prior
    452  1.10    mrg to HP-UX 11, there are bugs in the linker support for secondary symbols.
    453   1.1    mrg The patches correct a problem of linker core dumps creating shared
    454   1.1    mrg libraries containing secondary symbols, as well as various other
    455   1.1    mrg linking issues involving secondary symbols.
    456  1.10    mrg </p>
    457  1.10    mrg <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    458   1.1    mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    459  1.19    mrg uses the linker <samp class="option">+init</samp> and <samp class="option">+fini</samp> options for the same
    460   1.1    mrg purpose.  The patches correct various problems with the +init/+fini
    461   1.1    mrg options, including program core dumps.  Binutils 2.14 corrects a
    462  1.10    mrg problem on the 64-bit port resulting from HP&rsquo;s non-standard use of
    463   1.1    mrg the .init and .fini sections for array initializers and finalizers.
    464  1.10    mrg </p>
    465  1.19    mrg <p>Only the HP linker is supported for the &lsquo;<samp class="samp">hppa64-hp-hpux11*</samp>&rsquo; target.
    466  1.10    mrg </p>
    467  1.10    mrg <p>At this time, the GNU linker does not support the creation of long
    468   1.9    mrg branch stubs.  As a result, it cannot successfully link binaries
    469   1.1    mrg containing branch offsets larger than 8 megabytes.  In addition,
    470   1.1    mrg there are problems linking shared libraries, linking executables
    471  1.19    mrg with <samp class="option">-static</samp>, and with dwarf2 unwind and exception support.
    472  1.10    mrg It also doesn&rsquo;t provide stubs for internal calls to global functions
    473   1.9    mrg in shared libraries, so these calls cannot be overloaded.
    474  1.10    mrg </p>
    475  1.10    mrg <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    476   1.1    mrg versioning is not supported.  It may be necessary to disable symbol
    477  1.19    mrg versioning with <samp class="option">--disable-symvers</samp> when using GNU ld.
    478  1.10    mrg </p>
    479  1.10    mrg <p>POSIX threads are the default.  The optional DCE thread library is not
    480  1.19    mrg supported, so <samp class="option">--enable-threads=dce</samp> does not work.
    481  1.10    mrg </p>
    482  1.10    mrg <hr />
    483  1.19    mrg <a class="anchor" id="x-x-linux-gnu"></a><h3 class="heading" id="g_t*-*-linux-gnu"><span>*-*-linux-gnu<a class="copiable-link" href="#g_t*-*-linux-gnu"> &para;</a></span></h3>
    484  1.19    mrg <p>The <code class="code">.init_array</code> and <code class="code">.fini_array</code> sections are enabled
    485  1.15    mrg unconditionally which requires at least glibc 2.1 and binutils 2.12.
    486  1.15    mrg </p>
    487   1.1    mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    488   1.1    mrg in glibc 2.2.5 and later.  More information is available in the
    489   1.1    mrg libstdc++-v3 documentation.
    490  1.10    mrg </p>
    491  1.10    mrg <hr />
    492  1.19    mrg <a class="anchor" id="ix86-x-linux"></a><h3 class="heading" id="i_003f86-*-linux*"><span>i?86-*-linux*<a class="copiable-link" href="#i_003f86-*-linux*"> &para;</a></span></h3>
    493  1.10    mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform.
    494  1.19    mrg See <a class="uref" href="https://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    495  1.10    mrg </p>
    496  1.10    mrg <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    497   1.1    mrg possible you have a hardware problem.  Further information on this can be
    498  1.19    mrg found on <a class="uref" href="https://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    499  1.10    mrg </p>
    500  1.10    mrg <hr />
    501  1.19    mrg <a class="anchor" id="ix86-x-solaris2"></a><h3 class="heading" id="i_003f86-*-solaris2*"><span>i?86-*-solaris2*<a class="copiable-link" href="#i_003f86-*-solaris2*"> &para;</a></span></h3>
    502  1.12    mrg <p>Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
    503  1.19    mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp class="samp">amd64-*-solaris2*</samp>&rsquo; or
    504  1.19    mrg &lsquo;<samp class="samp">x86_64-*-solaris2*</samp>&rsquo; configuration that corresponds to
    505  1.19    mrg &lsquo;<samp class="samp">sparcv9-sun-solaris2*</samp>&rsquo;.
    506  1.10    mrg </p>
    507  1.10    mrg <hr />
    508  1.19    mrg <a class="anchor" id="ia64-x-linux"></a><h3 class="heading" id="ia64-*-linux"><span>ia64-*-linux<a class="copiable-link" href="#ia64-*-linux"> &para;</a></span></h3>
    509   1.1    mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    510   1.1    mrg running GNU/Linux.
    511  1.10    mrg </p>
    512  1.10    mrg <p>If you are using the installed system libunwind library with
    513  1.19    mrg <samp class="option">--with-system-libunwind</samp>, then you must use libunwind 0.98 or
    514   1.1    mrg later.
    515  1.10    mrg </p>
    516  1.10    mrg <hr />
    517  1.19    mrg <a class="anchor" id="ia64-x-hpux"></a><h3 class="heading" id="ia64-*-hpux*"><span>ia64-*-hpux*<a class="copiable-link" href="#ia64-*-hpux*"> &para;</a></span></h3>
    518   1.1    mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    519   1.1    mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    520  1.19    mrg the option <samp class="option">--with-gnu-as</samp> may be necessary.
    521  1.10    mrg </p>
    522  1.10    mrg <hr />
    523  1.10    mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    524  1.19    mrg <a class="anchor" id="x-ibm-aix"></a><h3 class="heading" id="g_t*-ibm-aix*"><span>*-ibm-aix*<a class="copiable-link" href="#g_t*-ibm-aix*"> &para;</a></span></h3>
    525  1.10    mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4.
    526   1.1    mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    527  1.10    mrg </p>
    528  1.10    mrg <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    529   1.1    mrg process resource limits (ulimit).  Hard limits are configured in the
    530  1.19    mrg <samp class="file">/etc/security/limits</samp> system configuration file.
    531  1.10    mrg </p>
    532  1.10    mrg <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    533   1.7    mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    534   1.7    mrg G++ can bootstrap recent releases of GCC.
    535  1.10    mrg </p>
    536  1.10    mrg <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    537   1.1    mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    538   1.1    mrg requires a larger data segment, which can be enabled through the
    539  1.19    mrg <var class="var">LDR_CNTRL</var> environment variable, e.g.,
    540  1.10    mrg </p>
    541  1.19    mrg <div class="example smallexample">
    542  1.19    mrg <pre class="example-preformatted">% LDR_CNTRL=MAXDATA=0x50000000
    543  1.10    mrg % export LDR_CNTRL
    544  1.10    mrg </pre></div>
    545   1.1    mrg 
    546  1.10    mrg <p>One can start with a pre-compiled version of GCC to build from
    547  1.10    mrg sources.  One may delete GCC&rsquo;s &ldquo;fixed&rdquo; header files when starting
    548   1.1    mrg with a version of GCC built for an earlier release of AIX.
    549  1.10    mrg </p>
    550  1.10    mrg <p>To speed up the configuration phases of bootstrapping and installing GCC,
    551  1.19    mrg one may use GNU Bash instead of AIX <code class="command">/bin/sh</code>, e.g.,
    552  1.10    mrg </p>
    553  1.19    mrg <div class="example smallexample">
    554  1.19    mrg <pre class="example-preformatted">% CONFIG_SHELL=/opt/freeware/bin/bash
    555  1.10    mrg % export CONFIG_SHELL
    556  1.10    mrg </pre></div>
    557   1.1    mrg 
    558  1.19    mrg <p>and then proceed as described in <a class="uref" href="build.html">the build
    559  1.10    mrg instructions</a>, where we strongly recommend specifying an absolute path
    560  1.19    mrg to invoke <var class="var">srcdir</var>/configure.
    561  1.10    mrg </p>
    562  1.10    mrg <p>Because GCC on AIX is built as a 32-bit executable by default,
    563   1.1    mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    564   1.1    mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    565   1.1    mrg as static archive libraries works better than shared libraries.
    566  1.10    mrg </p>
    567  1.19    mrg <p>Errors involving <code class="code">alloca</code> when building GCC generally are due
    568  1.19    mrg to an incorrect definition of <code class="code">CC</code> in the Makefile or mixing files
    569   1.1    mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    570  1.19    mrg the build, the native AIX compiler <strong class="strong">must</strong> be invoked as <code class="command">cc</code>
    571  1.19    mrg (not <code class="command">xlc</code>).  Once <code class="command">configure</code> has been informed of
    572  1.19    mrg <code class="command">xlc</code>, one needs to use &lsquo;<samp class="samp">make distclean</samp>&rsquo; to remove the
    573  1.19    mrg configure cache files and ensure that <code class="env">CC</code> environment variable
    574  1.19    mrg does not provide a definition that will confuse <code class="command">configure</code>.
    575   1.1    mrg If this error occurs during stage2 or later, then the problem most likely
    576   1.1    mrg is the version of Make (see above).
    577  1.10    mrg </p>
    578  1.19    mrg <p>The native <code class="command">as</code> and <code class="command">ld</code> are recommended for
    579   1.3  skrll bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    580   1.3  skrll Binutils version 2.20 is the minimum level that supports bootstrap on
    581  1.10    mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6&nbsp;or
    582   1.3  skrll AIX 7.  The native AIX tools do interoperate with GCC.
    583  1.10    mrg </p>
    584  1.10    mrg <p>AIX 7.1 added partial support for DWARF debugging, but full support
    585   1.7    mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    586   1.7    mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    587   1.7    mrg of libm.a missing important symbols; a fix for IV77796 will be
    588   1.7    mrg included in SP6.
    589  1.10    mrg </p>
    590  1.10    mrg <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    591   1.3  skrll assembler change that sometimes produces corrupt assembly files
    592   1.3  skrll causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    593   1.3  skrll can cause compilation failures with existing GCC installations.  An
    594   1.3  skrll AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    595   1.3  skrll IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    596   1.3  skrll AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    597   1.3  skrll AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    598  1.10    mrg </p>
    599  1.19    mrg <p>Building <samp class="file">libstdc++.a</samp> requires a fix for an AIX Assembler bug
    600   1.1    mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    601   1.1    mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    602   1.1    mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    603  1.10    mrg </p>
    604  1.19    mrg <a class="anchor" id="TransferAixShobj"></a><p>&lsquo;<samp class="samp">libstdc++</samp>&rsquo; in GCC 3.4 increments the major version number of the
    605  1.19    mrg shared object and GCC installation places the <samp class="file">libstdc++.a</samp>
    606   1.1    mrg shared library in a common location which will overwrite the and GCC
    607   1.1    mrg 3.3 version of the shared library.  Applications either need to be
    608   1.1    mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    609  1.19    mrg versions of the &lsquo;<samp class="samp">libstdc++</samp>&rsquo; shared object needs to be available
    610  1.19    mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp class="samp">libstdc++.so.4</samp>&rsquo;, if
    611  1.19    mrg present, and GCC 3.3 &lsquo;<samp class="samp">libstdc++.so.5</samp>&rsquo; shared objects can be
    612   1.1    mrg installed for runtime dynamic loading using the following steps to set
    613  1.19    mrg the &lsquo;<samp class="samp">F_LOADONLY</samp>&rsquo; flag in the shared object for <em class="emph">each</em>
    614  1.19    mrg multilib <samp class="file">libstdc++.a</samp> installed:
    615  1.10    mrg </p>
    616  1.10    mrg <p>Extract the shared objects from the currently installed
    617  1.19    mrg <samp class="file">libstdc++.a</samp> archive:
    618  1.19    mrg </p><div class="example smallexample">
    619  1.19    mrg <pre class="example-preformatted">% ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    620  1.10    mrg </pre></div>
    621   1.1    mrg 
    622  1.19    mrg <p>Enable the &lsquo;<samp class="samp">F_LOADONLY</samp>&rsquo; flag so that the shared object will be
    623   1.1    mrg available for runtime dynamic loading, but not linking:
    624  1.19    mrg </p><div class="example smallexample">
    625  1.19    mrg <pre class="example-preformatted">% strip -e libstdc++.so.4 libstdc++.so.5
    626  1.10    mrg </pre></div>
    627  1.10    mrg 
    628  1.10    mrg <p>Archive the runtime-only shared object in the GCC 3.4
    629  1.19    mrg <samp class="file">libstdc++.a</samp> archive:
    630  1.19    mrg </p><div class="example smallexample">
    631  1.19    mrg <pre class="example-preformatted">% ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    632  1.10    mrg </pre></div>
    633  1.10    mrg 
    634  1.10    mrg <p>Eventually, the
    635  1.19    mrg <a class="uref" href="./configure.html#WithAixSoname"><samp class="option">--with-aix-soname=svr4</samp></a>
    636   1.5    mrg configure option may drop the need for this procedure for libraries that
    637   1.5    mrg support it.
    638  1.10    mrg </p>
    639  1.10    mrg <p>Linking executables and shared libraries may produce warnings of
    640   1.1    mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    641   1.1    mrg have included multiple symbol definitions for certain global variable
    642   1.1    mrg and function declarations in the original program.  The warnings should
    643   1.1    mrg not prevent the linker from producing a correct library or runnable
    644   1.1    mrg executable.
    645  1.10    mrg </p>
    646  1.10    mrg <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    647   1.1    mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    648  1.10    mrg to parse archive libraries did not handle the new format correctly.
    649   1.1    mrg These routines are used by GCC and result in error messages during
    650   1.1    mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    651  1.19    mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp class="option">-g</samp>
    652   1.1    mrg option of the archive command may be used to create archives of 32-bit
    653   1.1    mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    654   1.1    mrg routines is shipped with AIX 4.3.2 and above.
    655  1.10    mrg </p>
    656  1.10    mrg <p>Some versions of the AIX binder (linker) can fail with a relocation
    657  1.19    mrg overflow severe error when the <samp class="option">-bbigtoc</samp> option is used to link
    658   1.1    mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    659   1.1    mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    660   1.1    mrg available from IBM Customer Support and from its
    661  1.19    mrg <a class="uref" href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    662   1.1    mrg website as PTF U455193.
    663  1.10    mrg </p>
    664  1.10    mrg <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    665   1.1    mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    666   1.1    mrg APAR IX87327 is available from IBM Customer Support and from its
    667  1.19    mrg <a class="uref" href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    668   1.1    mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    669  1.10    mrg </p>
    670  1.10    mrg <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    671   1.1    mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    672   1.1    mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    673  1.19    mrg <a class="uref" href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    674   1.1    mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    675  1.10    mrg </p>
    676  1.10    mrg <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    677   1.1    mrg use NLS to support locale-specific representations of various data
    678  1.19    mrg formats including floating-point numbers (e.g., &lsquo;<samp class="samp">.</samp>&rsquo;  vs &lsquo;<samp class="samp">,</samp>&rsquo; for
    679   1.1    mrg separating decimal fractions).  There have been problems reported where
    680   1.1    mrg GCC does not produce the same floating-point formats that the assembler
    681  1.19    mrg expects.  If one encounters this problem, set the <code class="env">LANG</code>
    682  1.19    mrg environment variable to &lsquo;<samp class="samp">C</samp>&rsquo; or &lsquo;<samp class="samp">En_US</samp>&rsquo;.
    683  1.10    mrg </p>
    684  1.19    mrg <p>A default can be specified with the <samp class="option">-mcpu=<var class="var">cpu_type</var></samp>
    685  1.19    mrg switch and using the configure option <samp class="option">--with-cpu-<var class="var">cpu_type</var></samp>.
    686  1.10    mrg </p>
    687  1.10    mrg <hr />
    688  1.19    mrg <a class="anchor" id="iq2000-x-elf"></a><h3 class="heading" id="iq2000-*-elf"><span>iq2000-*-elf<a class="copiable-link" href="#iq2000-*-elf"> &para;</a></span></h3>
    689   1.1    mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    690   1.1    mrg applications.  There are no standard Unix configurations.
    691  1.10    mrg </p>
    692  1.10    mrg <hr />
    693  1.19    mrg <a class="anchor" id="lm32-x-elf"></a><h3 class="heading" id="lm32-*-elf"><span>lm32-*-elf<a class="copiable-link" href="#lm32-*-elf"> &para;</a></span></h3>
    694  1.10    mrg <p>Lattice Mico32 processor.
    695   1.1    mrg This configuration is intended for embedded systems.
    696  1.10    mrg </p>
    697  1.10    mrg <hr />
    698  1.19    mrg <a class="anchor" id="lm32-x-uclinux"></a><h3 class="heading" id="lm32-*-uclinux"><span>lm32-*-uclinux<a class="copiable-link" href="#lm32-*-uclinux"> &para;</a></span></h3>
    699  1.10    mrg <p>Lattice Mico32 processor.
    700   1.1    mrg This configuration is intended for embedded systems running uClinux.
    701  1.10    mrg </p>
    702  1.10    mrg <hr />
    703  1.19    mrg <a class="anchor" id="loongarch"></a><h3 class="heading" id="LoongArch"><span>LoongArch<a class="copiable-link" href="#LoongArch"> &para;</a></span></h3>
    704  1.15    mrg <p>LoongArch processor.
    705  1.15    mrg The following LoongArch targets are available:
    706  1.19    mrg </p><dl class="table">
    707  1.19    mrg <dt><code class="code">loongarch64-linux-gnu*</code></dt>
    708  1.15    mrg <dd><p>LoongArch processor running GNU/Linux.  This target triplet may be coupled
    709  1.15    mrg with a small set of possible suffixes to identify their default ABI type:
    710  1.19    mrg </p><dl class="table">
    711  1.19    mrg <dt><code class="code">f64</code></dt>
    712  1.19    mrg <dd><p>Uses <code class="code">lp64d/base</code> ABI by default.
    713  1.15    mrg </p></dd>
    714  1.19    mrg <dt><code class="code">f32</code></dt>
    715  1.19    mrg <dd><p>Uses <code class="code">lp64f/base</code> ABI by default.
    716  1.15    mrg </p></dd>
    717  1.19    mrg <dt><code class="code">sf</code></dt>
    718  1.19    mrg <dd><p>Uses <code class="code">lp64s/base</code> ABI by default.
    719  1.15    mrg </p></dd>
    720  1.15    mrg </dl>
    721  1.15    mrg 
    722  1.15    mrg </dd>
    723  1.19    mrg <dt><code class="code">loongarch64-linux-gnu</code></dt>
    724  1.19    mrg <dd><p>Same as <code class="code">loongarch64-linux-gnuf64</code> for legacy support.
    725  1.15    mrg </p></dd>
    726  1.15    mrg </dl>
    727  1.15    mrg 
    728  1.15    mrg <p>More information about LoongArch can be found at
    729  1.19    mrg <a class="uref" href="https://github.com/loongson/LoongArch-Documentation">https://github.com/loongson/LoongArch-Documentation</a>.
    730  1.15    mrg </p>
    731  1.15    mrg <hr />
    732  1.19    mrg <a class="anchor" id="m32c-x-elf"></a><h3 class="heading" id="m32c-*-elf"><span>m32c-*-elf<a class="copiable-link" href="#m32c-*-elf"> &para;</a></span></h3>
    733  1.10    mrg <p>Renesas M32C processor.
    734   1.1    mrg This configuration is intended for embedded systems.
    735  1.10    mrg </p>
    736  1.10    mrg <hr />
    737  1.19    mrg <a class="anchor" id="m32r-x-elf"></a><h3 class="heading" id="m32r-*-elf"><span>m32r-*-elf<a class="copiable-link" href="#m32r-*-elf"> &para;</a></span></h3>
    738  1.10    mrg <p>Renesas M32R processor.
    739   1.1    mrg This configuration is intended for embedded systems.
    740  1.10    mrg </p>
    741  1.10    mrg <hr />
    742  1.19    mrg <a class="anchor" id="m68k-x-x"></a><h3 class="heading" id="m68k-*-*"><span>m68k-*-*<a class="copiable-link" href="#m68k-*-*"> &para;</a></span></h3>
    743   1.1    mrg <p>By default,
    744  1.19    mrg &lsquo;<samp class="samp">m68k-*-elf*</samp>&rsquo;, &lsquo;<samp class="samp">m68k-*-rtems</samp>&rsquo;,  &lsquo;<samp class="samp">m68k-*-uclinux</samp>&rsquo; and
    745  1.19    mrg &lsquo;<samp class="samp">m68k-*-linux</samp>&rsquo;
    746   1.1    mrg build libraries for both M680x0 and ColdFire processors.  If you only
    747   1.1    mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    748  1.19    mrg <samp class="option">--with-arch=m68k</samp> to <code class="command">configure</code>.  Alternatively, you
    749  1.19    mrg can omit the M680x0 libraries by passing <samp class="option">--with-arch=cf</samp> to
    750  1.19    mrg <code class="command">configure</code>.  These targets default to 5206 or 5475 code as
    751   1.1    mrg appropriate for the target system when
    752  1.19    mrg configured with <samp class="option">--with-arch=cf</samp> and 68020 code otherwise.
    753  1.10    mrg </p>
    754  1.19    mrg <p>The &lsquo;<samp class="samp">m68k-*-netbsd</samp>&rsquo; and
    755  1.19    mrg &lsquo;<samp class="samp">m68k-*-openbsd</samp>&rsquo; targets also support the <samp class="option">--with-arch</samp>
    756   1.1    mrg option.  They will generate ColdFire CFV4e code when configured with
    757  1.19    mrg <samp class="option">--with-arch=cf</samp> and 68020 code otherwise.
    758  1.10    mrg </p>
    759  1.10    mrg <p>You can override the default processors listed above by configuring
    760  1.19    mrg with <samp class="option">--with-cpu=<var class="var">target</var></samp>.  This <var class="var">target</var> can either
    761  1.19    mrg be a <samp class="option">-mcpu</samp> argument or one of the following values:
    762  1.19    mrg &lsquo;<samp class="samp">m68000</samp>&rsquo;, &lsquo;<samp class="samp">m68010</samp>&rsquo;, &lsquo;<samp class="samp">m68020</samp>&rsquo;, &lsquo;<samp class="samp">m68030</samp>&rsquo;,
    763  1.19    mrg &lsquo;<samp class="samp">m68040</samp>&rsquo;, &lsquo;<samp class="samp">m68060</samp>&rsquo;, &lsquo;<samp class="samp">m68020-40</samp>&rsquo; and &lsquo;<samp class="samp">m68020-60</samp>&rsquo;.
    764  1.10    mrg </p>
    765  1.10    mrg <p>GCC requires at least binutils version 2.17 on these targets.
    766  1.10    mrg </p>
    767  1.10    mrg <hr />
    768  1.19    mrg <a class="anchor" id="m68k-x-uclinux"></a><h3 class="heading" id="m68k-*-uclinux"><span>m68k-*-uclinux<a class="copiable-link" href="#m68k-*-uclinux"> &para;</a></span></h3>
    769   1.1    mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    770  1.19    mrg &lsquo;<samp class="samp">m68k-linux-gnu</samp>&rsquo; ABI rather than the &lsquo;<samp class="samp">m68k-elf</samp>&rsquo; ABI.
    771   1.1    mrg It also added improved support for C++ and flat shared libraries,
    772   1.3  skrll both of which were ABI changes.
    773  1.10    mrg </p>
    774  1.10    mrg <hr />
    775  1.19    mrg <a class="anchor" id="microblaze-x-elf"></a><h3 class="heading" id="microblaze-*-elf"><span>microblaze-*-elf<a class="copiable-link" href="#microblaze-*-elf"> &para;</a></span></h3>
    776  1.10    mrg <p>Xilinx MicroBlaze processor.
    777   1.1    mrg This configuration is intended for embedded systems.
    778  1.10    mrg </p>
    779  1.10    mrg <hr />
    780  1.19    mrg <a class="anchor" id="mips-x-x"></a><h3 class="heading" id="mips-*-*"><span>mips-*-*<a class="copiable-link" href="#mips-*-*"> &para;</a></span></h3>
    781   1.1    mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    782  1.10    mrg sections for all it&rsquo;s [sic] sectons [sic]&rdquo;, don&rsquo;t worry about it.  This
    783   1.1    mrg happens whenever you use GAS with the MIPS linker, but there is not
    784   1.1    mrg really anything wrong, and it is okay to use the output file.  You can
    785   1.1    mrg stop such warnings by installing the GNU linker.
    786  1.10    mrg </p>
    787  1.10    mrg <p>It would be nice to extend GAS to produce the gp tables, but they are
    788   1.1    mrg optional, and there should not be a warning about their absence.
    789  1.10    mrg </p>
    790  1.10    mrg <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    791   1.1    mrg and later.  A patch went in just after the GCC 3.3 release to
    792  1.19    mrg make &lsquo;<samp class="samp">mips*-*-*</samp>&rsquo; use the generic implementation instead.  You can also
    793  1.19    mrg configure for &lsquo;<samp class="samp">mipsel-elf</samp>&rsquo; as a workaround.  The
    794  1.19    mrg &lsquo;<samp class="samp">mips*-*-linux*</samp>&rsquo; target continues to use the MIPS II routines.  More
    795   1.1    mrg work on this is expected in future releases.
    796  1.10    mrg </p>
    797   1.1    mrg 
    798  1.19    mrg <p>The built-in <code class="code">__sync_*</code> functions are available on MIPS II and
    799  1.19    mrg later systems and others that support the &lsquo;<samp class="samp">ll</samp>&rsquo;, &lsquo;<samp class="samp">sc</samp>&rsquo; and
    800  1.19    mrg &lsquo;<samp class="samp">sync</samp>&rsquo; instructions.  This can be overridden by passing
    801  1.19    mrg <samp class="option">--with-llsc</samp> or <samp class="option">--without-llsc</samp> when configuring GCC.
    802   1.1    mrg Since the Linux kernel emulates these instructions if they are
    803  1.19    mrg missing, the default for &lsquo;<samp class="samp">mips*-*-linux*</samp>&rsquo; targets is
    804  1.19    mrg <samp class="option">--with-llsc</samp>.  The <samp class="option">--with-llsc</samp> and
    805  1.19    mrg <samp class="option">--without-llsc</samp> configure options may be overridden at compile
    806  1.19    mrg time by passing the <samp class="option">-mllsc</samp> or <samp class="option">-mno-llsc</samp> options to
    807   1.1    mrg the compiler.
    808  1.10    mrg </p>
    809  1.10    mrg <p>MIPS systems check for division by zero (unless
    810  1.19    mrg <samp class="option">-mno-check-zero-division</samp> is passed to the compiler) by
    811   1.1    mrg generating either a conditional trap or a break instruction.  Using
    812   1.1    mrg trap results in smaller code, but is only supported on MIPS II and
    813   1.1    mrg later.  Also, some versions of the Linux kernel have a bug that
    814  1.19    mrg prevents trap from generating the proper signal (<code class="code">SIGFPE</code>).  To enable
    815  1.19    mrg the use of break, use the <samp class="option">--with-divide=breaks</samp>
    816  1.19    mrg <code class="command">configure</code> option when configuring GCC.  The default is to
    817   1.1    mrg use traps on systems that support them.
    818  1.10    mrg </p>
    819  1.10    mrg <hr />
    820  1.19    mrg <a class="anchor" id="moxie-x-elf"></a><h3 class="heading" id="moxie-*-elf"><span>moxie-*-elf<a class="copiable-link" href="#moxie-*-elf"> &para;</a></span></h3>
    821   1.3  skrll <p>The moxie processor.
    822  1.10    mrg </p>
    823  1.10    mrg <hr />
    824  1.19    mrg <a class="anchor" id="msp430-x-elf"></a><h3 class="heading" id="msp430-*-elf*"><span>msp430-*-elf*<a class="copiable-link" href="#msp430-*-elf*"> &para;</a></span></h3>
    825  1.10    mrg <p>TI MSP430 processor.
    826   1.5    mrg This configuration is intended for embedded systems.
    827  1.10    mrg </p>
    828  1.19    mrg <p>&lsquo;<samp class="samp">msp430-*-elf</samp>&rsquo; is the standard configuration with most GCC
    829  1.12    mrg features enabled by default.
    830  1.12    mrg </p>
    831  1.19    mrg <p>&lsquo;<samp class="samp">msp430-*-elfbare</samp>&rsquo; is tuned for a bare-metal environment, and disables
    832  1.12    mrg features related to shared libraries and other functionality not used for
    833  1.12    mrg this device.  This reduces code and data usage of the GCC libraries, resulting
    834  1.12    mrg in a minimal run-time environment by default.
    835  1.12    mrg </p>
    836  1.12    mrg <p>Features disabled by default include:
    837  1.19    mrg </p><ul class="itemize mark-bullet">
    838  1.19    mrg <li>transactional memory
    839  1.19    mrg </li><li>__cxa_atexit
    840  1.12    mrg </li></ul>
    841  1.12    mrg 
    842  1.10    mrg <hr />
    843  1.19    mrg <a class="anchor" id="nds32le-x-elf"></a><h3 class="heading" id="nds32le-*-elf"><span>nds32le-*-elf<a class="copiable-link" href="#nds32le-*-elf"> &para;</a></span></h3>
    844   1.5    mrg <p>Andes NDS32 target in little endian mode.
    845  1.10    mrg </p>
    846  1.10    mrg <hr />
    847  1.19    mrg <a class="anchor" id="nds32be-x-elf"></a><h3 class="heading" id="nds32be-*-elf"><span>nds32be-*-elf<a class="copiable-link" href="#nds32be-*-elf"> &para;</a></span></h3>
    848   1.5    mrg <p>Andes NDS32 target in big endian mode.
    849  1.10    mrg </p>
    850  1.10    mrg <hr />
    851  1.19    mrg <a class="anchor" id="nvptx-x-none"></a><h3 class="heading" id="nvptx-*-none"><span>nvptx-*-none<a class="copiable-link" href="#nvptx-*-none"> &para;</a></span></h3>
    852   1.5    mrg <p>Nvidia PTX target.
    853  1.10    mrg </p>
    854  1.10    mrg <p>Instead of GNU binutils, you will need to install
    855  1.19    mrg <a class="uref" href="https://github.com/SourceryTools/nvptx-tools">nvptx-tools</a>.
    856   1.5    mrg Tell GCC where to find it:
    857  1.19    mrg <samp class="option">--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</samp>.
    858  1.10    mrg </p>
    859  1.18    mrg <p>You will need newlib 4.3.0 or later.  It can be
    860  1.10    mrg automatically built together with GCC.  For this, add a symbolic link
    861  1.19    mrg to nvptx-newlib&rsquo;s <samp class="file">newlib</samp> directory to the directory containing
    862  1.10    mrg the GCC sources.
    863  1.10    mrg </p>
    864  1.19    mrg <p>Use the <samp class="option">--disable-sjlj-exceptions</samp> and
    865  1.19    mrg <samp class="option">--enable-newlib-io-long-long</samp> options when configuring.
    866  1.10    mrg </p>
    867  1.19    mrg <p>The <samp class="option">--with-arch</samp> option may be specified to override the
    868  1.19    mrg default value for the <samp class="option">-march</samp> option, and to also build
    869  1.18    mrg corresponding target libraries.
    870  1.19    mrg The default is <samp class="option">--with-arch=sm_30</samp>.
    871  1.18    mrg </p>
    872  1.19    mrg <p>For example, if <samp class="option">--with-arch=sm_70</samp> is specified,
    873  1.19    mrg <samp class="option">-march=sm_30</samp> and <samp class="option">-march=sm_70</samp> target libraries are
    874  1.19    mrg built, and code generation defaults to <samp class="option">-march=sm_70</samp>.
    875  1.18    mrg </p>
    876  1.10    mrg <hr />
    877  1.19    mrg <a class="anchor" id="or1k-x-elf"></a><h3 class="heading" id="or1k-*-elf"><span>or1k-*-elf<a class="copiable-link" href="#or1k-*-elf"> &para;</a></span></h3>
    878  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    879  1.11    mrg This configuration is intended for embedded systems.
    880  1.11    mrg </p>
    881  1.11    mrg <hr />
    882  1.19    mrg <a class="anchor" id="or1k-x-linux"></a><h3 class="heading" id="or1k-*-linux"><span>or1k-*-linux<a class="copiable-link" href="#or1k-*-linux"> &para;</a></span></h3>
    883  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    884  1.11    mrg </p>
    885  1.11    mrg <hr />
    886  1.19    mrg <a class="anchor" id="powerpc-x-x"></a><h3 class="heading" id="powerpc-*-*"><span>powerpc-*-*<a class="copiable-link" href="#powerpc-*-*"> &para;</a></span></h3>
    887  1.19    mrg <p>You can specify a default version for the <samp class="option">-mcpu=<var class="var">cpu_type</var></samp>
    888  1.19    mrg switch by using the configure option <samp class="option">--with-cpu-<var class="var">cpu_type</var></samp>.
    889  1.10    mrg </p>
    890  1.12    mrg <p>You will need GNU binutils 2.20 or newer.
    891  1.10    mrg </p>
    892  1.10    mrg <hr />
    893  1.19    mrg <a class="anchor" id="powerpc-x-darwin"></a><h3 class="heading" id="powerpc-*-darwin*"><span>powerpc-*-darwin*<a class="copiable-link" href="#powerpc-*-darwin*"> &para;</a></span></h3>
    894   1.1    mrg <p>PowerPC running Darwin (Mac OS X kernel).
    895  1.10    mrg </p>
    896  1.10    mrg <p>Pre-installed versions of Mac OS X may not include any developer tools,
    897   1.1    mrg meaning that you will not be able to build GCC from source.  Tool
    898   1.1    mrg binaries are available at
    899  1.19    mrg <a class="uref" href="https://opensource.apple.com">https://opensource.apple.com</a>.
    900  1.10    mrg </p>
    901  1.10    mrg <p>This version of GCC requires at least cctools-590.36.  The
    902   1.1    mrg cctools-590.36 package referenced from
    903  1.19    mrg <a class="uref" href="https://gcc.gnu.org/ml/gcc/2006-03/msg00507.html">https://gcc.gnu.org/ml/gcc/2006-03/msg00507.html</a> will not work
    904   1.1    mrg on systems older than 10.3.9 (aka darwin7.9.0).
    905  1.10    mrg </p>
    906  1.10    mrg <hr />
    907  1.19    mrg <a class="anchor" id="powerpc-x-elf"></a><h3 class="heading" id="powerpc-*-elf"><span>powerpc-*-elf<a class="copiable-link" href="#powerpc-*-elf"> &para;</a></span></h3>
    908   1.1    mrg <p>PowerPC system in big endian mode, running System V.4.
    909  1.10    mrg </p>
    910  1.10    mrg <hr />
    911  1.19    mrg <a class="anchor" id="powerpc-x-linux-gnu"></a><h3 class="heading" id="powerpc*-*-linux-gnu*"><span>powerpc*-*-linux-gnu*<a class="copiable-link" href="#powerpc*-*-linux-gnu*"> &para;</a></span></h3>
    912   1.1    mrg <p>PowerPC system in big endian mode running Linux.
    913  1.10    mrg </p>
    914  1.10    mrg <hr />
    915  1.19    mrg <a class="anchor" id="powerpc-x-netbsd"></a><h3 class="heading" id="powerpc-*-netbsd*"><span>powerpc-*-netbsd*<a class="copiable-link" href="#powerpc-*-netbsd*"> &para;</a></span></h3>
    916   1.1    mrg <p>PowerPC system in big endian mode running NetBSD.
    917  1.10    mrg </p>
    918  1.10    mrg <hr />
    919  1.19    mrg <a class="anchor" id="powerpc-x-eabisim"></a><h3 class="heading" id="powerpc-*-eabisim"><span>powerpc-*-eabisim<a class="copiable-link" href="#powerpc-*-eabisim"> &para;</a></span></h3>
    920   1.1    mrg <p>Embedded PowerPC system in big endian mode for use in running under the
    921   1.1    mrg PSIM simulator.
    922  1.10    mrg </p>
    923  1.10    mrg <hr />
    924  1.19    mrg <a class="anchor" id="powerpc-x-eabi"></a><h3 class="heading" id="powerpc-*-eabi"><span>powerpc-*-eabi<a class="copiable-link" href="#powerpc-*-eabi"> &para;</a></span></h3>
    925   1.1    mrg <p>Embedded PowerPC system in big endian mode.
    926  1.10    mrg </p>
    927  1.10    mrg <hr />
    928  1.19    mrg <a class="anchor" id="powerpcle-x-elf"></a><h3 class="heading" id="powerpcle-*-elf"><span>powerpcle-*-elf<a class="copiable-link" href="#powerpcle-*-elf"> &para;</a></span></h3>
    929   1.1    mrg <p>PowerPC system in little endian mode, running System V.4.
    930  1.10    mrg </p>
    931  1.10    mrg <hr />
    932  1.19    mrg <a class="anchor" id="powerpcle-x-eabisim"></a><h3 class="heading" id="powerpcle-*-eabisim"><span>powerpcle-*-eabisim<a class="copiable-link" href="#powerpcle-*-eabisim"> &para;</a></span></h3>
    933   1.1    mrg <p>Embedded PowerPC system in little endian mode for use in running under
    934   1.1    mrg the PSIM simulator.
    935  1.10    mrg </p>
    936  1.10    mrg <hr />
    937  1.19    mrg <a class="anchor" id="powerpcle-x-eabi"></a><h3 class="heading" id="powerpcle-*-eabi"><span>powerpcle-*-eabi<a class="copiable-link" href="#powerpcle-*-eabi"> &para;</a></span></h3>
    938   1.1    mrg <p>Embedded PowerPC system in little endian mode.
    939  1.10    mrg </p>
    940  1.10    mrg <hr />
    941  1.19    mrg <a class="anchor" id="rl78-x-elf"></a><h3 class="heading" id="rl78-*-elf"><span>rl78-*-elf<a class="copiable-link" href="#rl78-*-elf"> &para;</a></span></h3>
    942  1.10    mrg <p>The Renesas RL78 processor.
    943  1.10    mrg This configuration is intended for embedded systems.
    944  1.10    mrg </p>
    945  1.10    mrg <hr />
    946  1.19    mrg <a class="anchor" id="riscv32-x-elf"></a><h3 class="heading" id="riscv32-*-elf"><span>riscv32-*-elf<a class="copiable-link" href="#riscv32-*-elf"> &para;</a></span></h3>
    947  1.10    mrg <p>The RISC-V RV32 instruction set.
    948   1.3  skrll This configuration is intended for embedded systems.
    949  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
    950  1.10    mrg </p>
    951  1.10    mrg <hr />
    952  1.19    mrg <a class="anchor" id="riscv32-x-linux"></a><h3 class="heading" id="riscv32-*-linux"><span>riscv32-*-linux<a class="copiable-link" href="#riscv32-*-linux"> &para;</a></span></h3>
    953  1.10    mrg <p>The RISC-V RV32 instruction set running GNU/Linux.
    954  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
    955  1.10    mrg </p>
    956  1.10    mrg <hr />
    957  1.19    mrg <a class="anchor" id="riscv64-x-elf"></a><h3 class="heading" id="riscv64-*-elf"><span>riscv64-*-elf<a class="copiable-link" href="#riscv64-*-elf"> &para;</a></span></h3>
    958  1.10    mrg <p>The RISC-V RV64 instruction set.
    959  1.10    mrg This configuration is intended for embedded systems.
    960  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
    961  1.10    mrg </p>
    962  1.10    mrg <hr />
    963  1.19    mrg <a class="anchor" id="riscv64-x-linux"></a><h3 class="heading" id="riscv64-*-linux"><span>riscv64-*-linux<a class="copiable-link" href="#riscv64-*-linux"> &para;</a></span></h3>
    964  1.10    mrg <p>The RISC-V RV64 instruction set running GNU/Linux.
    965  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
    966  1.10    mrg </p>
    967  1.10    mrg <hr />
    968  1.19    mrg <a class="anchor" id="rx-x-elf"></a><h3 class="heading" id="rx-*-elf"><span>rx-*-elf<a class="copiable-link" href="#rx-*-elf"> &para;</a></span></h3>
    969   1.9    mrg <p>The Renesas RX processor.
    970  1.10    mrg </p>
    971  1.10    mrg <hr />
    972  1.19    mrg <a class="anchor" id="s390-x-linux"></a><h3 class="heading" id="s390-*-linux*"><span>s390-*-linux*<a class="copiable-link" href="#s390-*-linux*"> &para;</a></span></h3>
    973   1.1    mrg <p>S/390 system running GNU/Linux for S/390.
    974  1.10    mrg </p>
    975  1.10    mrg <hr />
    976  1.19    mrg <a class="anchor" id="s390x-x-linux"></a><h3 class="heading" id="s390x-*-linux*"><span>s390x-*-linux*<a class="copiable-link" href="#s390x-*-linux*"> &para;</a></span></h3>
    977   1.1    mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
    978  1.10    mrg </p>
    979  1.10    mrg <hr />
    980  1.19    mrg <a class="anchor" id="s390x-ibm-tpf"></a><h3 class="heading" id="s390x-ibm-tpf*"><span>s390x-ibm-tpf*<a class="copiable-link" href="#s390x-ibm-tpf*"> &para;</a></span></h3>
    981   1.1    mrg <p>zSeries system (64-bit) running TPF.  This platform is
    982   1.1    mrg supported as cross-compilation target only.
    983  1.10    mrg </p>
    984  1.10    mrg <hr />
    985  1.19    mrg <a class="anchor" id="x-x-solaris2"></a><h3 class="heading" id="g_t*-*-solaris2*"><span>*-*-solaris2*<a class="copiable-link" href="#g_t*-*-solaris2*"> &para;</a></span></h3>
    986  1.18    mrg <p>Support for Solaris 11.3 and earlier has been obsoleted in GCC 13, but
    987  1.19    mrg can still be enabled by configuring with <samp class="option">--enable-obsolete</samp>.
    988  1.18    mrg Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
    989  1.12    mrg 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
    990  1.12    mrg GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
    991  1.12    mrg </p>
    992  1.12    mrg <p>Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
    993  1.19    mrg <code class="command">/usr/gcc/4.5/bin/gcc</code> or similar.  Solaris 11.4
    994  1.18    mrg provides one or more of GCC 5, 7, 9, 10, 11, and 12.
    995  1.18    mrg </p>
    996  1.19    mrg <p>You need to install the <code class="code">system/header</code>, <code class="code">system/linker</code>, and
    997  1.19    mrg <code class="code">developer/assembler</code> packages.
    998  1.10    mrg </p>
    999  1.19    mrg <p>Trying to use the compatibility tools in <samp class="file">/usr/ucb</samp>, from the
   1000  1.19    mrg <code class="code">compatibility/ucb</code> package, to install GCC has been observed to
   1001  1.19    mrg cause trouble.  The fix is to remove <samp class="file">/usr/ucb</samp> from your
   1002  1.19    mrg <code class="env">PATH</code>.
   1003  1.18    mrg </p>
   1004  1.18    mrg <p>The build process works more smoothly with the legacy Solaris tools so,
   1005  1.19    mrg if you have <samp class="file">/usr/xpg4/bin</samp> in your <code class="env">PATH</code>, we recommend that
   1006  1.19    mrg you place <samp class="file">/usr/bin</samp> before <samp class="file">/usr/xpg4/bin</samp> for the duration
   1007  1.18    mrg of the build.
   1008  1.10    mrg </p>
   1009  1.10    mrg <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1010  1.18    mrg conjunction with the Solaris linker.
   1011  1.18    mrg </p>
   1012  1.19    mrg <p>The GNU <code class="command">as</code> versions included in Solaris 11.3, from GNU
   1013  1.19    mrg binutils 2.23.1 or newer (in <samp class="file">/usr/bin/gas</samp> and
   1014  1.19    mrg <samp class="file">/usr/gnu/bin/as</samp>), are known to work.  The version from GNU
   1015  1.18    mrg binutils 2.40 is known to work as well.  Recent versions of the Solaris
   1016  1.19    mrg assembler in <samp class="file">/usr/bin/as</samp> work almost as well, though.  To use GNU
   1017  1.19    mrg <code class="command">as</code>, configure with the options <samp class="option">--with-gnu-as
   1018  1.18    mrg --with-as=/usr/gnu/bin/as</samp>.
   1019  1.18    mrg </p>
   1020  1.18    mrg <p>For linking, the Solaris linker is preferred.  If you want to use the
   1021  1.18    mrg GNU linker instead, the version in Solaris 11.3, from GNU binutils
   1022  1.19    mrg 2.23.1 or newer (in <samp class="file">/usr/gnu/bin/ld</samp> and <samp class="file">/usr/bin/gld</samp>),
   1023  1.18    mrg works, as does the version from GNU binutils 2.40.  However, it
   1024  1.18    mrg generally lacks platform specific features, so better stay with Solaris
   1025  1.19    mrg <code class="command">ld</code>.  To use the LTO linker plugin
   1026  1.19    mrg (<samp class="option">-fuse-linker-plugin</samp>) with GNU <code class="command">ld</code>, GNU binutils
   1027  1.19    mrg <em class="emph">must</em> be configured with <samp class="option">--enable-largefile</samp>.  To use
   1028  1.19    mrg Solaris <code class="command">ld</code>, we recommend to configure with
   1029  1.19    mrg <samp class="option">--without-gnu-ld --with-ld=/usr/bin/ld</samp> to guarantee the
   1030  1.19    mrg right linker is found irrespective of the user&rsquo;s <code class="env">PATH</code>.
   1031  1.18    mrg </p>
   1032  1.18    mrg <p>Note that your mileage may vary if you use a combination of the GNU
   1033  1.19    mrg tools and the Solaris tools: while the combination GNU <code class="command">as</code> and
   1034  1.19    mrg Solaris <code class="command">ld</code> works well, the reverse combination Solaris
   1035  1.19    mrg <code class="command">as</code> with GNU <code class="command">ld</code> may fail to build or cause memory
   1036  1.18    mrg corruption at runtime in some cases for C++ programs.
   1037  1.18    mrg </p>
   1038  1.19    mrg <p>To enable symbol versioning in &lsquo;<samp class="samp">libstdc++</samp>&rsquo; and other runtime
   1039  1.18    mrg libraries with the Solaris linker, you need to have any version of GNU
   1040  1.19    mrg <code class="command">c++filt</code>, which is part of GNU binutils.  Symbol versioning
   1041  1.18    mrg will be disabled if no appropriate version is found.  Solaris
   1042  1.19    mrg <code class="command">c++filt</code> from the Solaris Studio compilers does <em class="emph">not</em>
   1043  1.18    mrg work.
   1044  1.18    mrg </p>
   1045  1.18    mrg <p>In order to build the GNU Ada compiler, GNAT, a working GNAT is needed.
   1046  1.18    mrg Since Solaris 11.4 SRU 39, GNAT 11 or 12 is bundled in the
   1047  1.19    mrg <code class="code">developer/gcc/gcc-gnat</code> package.
   1048  1.10    mrg </p>
   1049  1.19    mrg <p>In order to build the GNU D compiler, GDC, a working &lsquo;<samp class="samp">libphobos</samp>&rsquo; is
   1050  1.15    mrg needed.  That library wasn&rsquo;t built by default in GCC 9&ndash;11 on SPARC, or
   1051  1.15    mrg on x86 when the Solaris assembler is used, but can be enabled by
   1052  1.19    mrg configuring with <samp class="option">--enable-libphobos</samp>.  Also, GDC 9.4.0 is
   1053  1.15    mrg required on x86, while GDC 9.3.0 is known to work on SPARC.
   1054  1.15    mrg </p>
   1055  1.12    mrg <p>The versions of the GNU Multiple Precision Library (GMP), the MPFR
   1056  1.12    mrg library and the MPC library bundled with Solaris 11.3 and later are
   1057  1.12    mrg usually recent enough to match GCC&rsquo;s requirements.  There are two
   1058  1.12    mrg caveats:
   1059  1.10    mrg </p>
   1060  1.19    mrg <ul class="itemize mark-bullet">
   1061  1.19    mrg <li>While the version of the GMP library in Solaris 11.3 works with GCC, you
   1062  1.19    mrg need to configure with <samp class="option">--with-gmp-include=/usr/include/gmp</samp>.
   1063  1.12    mrg 
   1064  1.19    mrg </li><li>The version of the MPFR libary included in Solaris 11.3 is too old; you
   1065  1.12    mrg need to provide a more recent one.
   1066  1.15    mrg 
   1067  1.12    mrg </li></ul>
   1068  1.12    mrg 
   1069  1.10    mrg <hr />
   1070  1.19    mrg <a class="anchor" id="sparc-x-x"></a><h3 class="heading" id="sparc*-*-*"><span>sparc*-*-*<a class="copiable-link" href="#sparc*-*-*"> &para;</a></span></h3>
   1071   1.3  skrll <p>This section contains general configuration information for all
   1072   1.3  skrll SPARC-based platforms.  In addition to reading this section, please
   1073   1.3  skrll read all other sections that match your target.
   1074  1.10    mrg </p>
   1075  1.10    mrg <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1076   1.3  skrll library and the MPC library are known to be miscompiled by earlier
   1077   1.3  skrll versions of GCC on these platforms.  We therefore recommend the use
   1078   1.3  skrll of the exact versions of these libraries listed as minimal versions
   1079  1.19    mrg in <a class="uref" href="prerequisites.html">the prerequisites</a>.
   1080  1.10    mrg </p>
   1081  1.10    mrg <hr />
   1082  1.19    mrg <a class="anchor" id="sparc-sun-solaris2"></a><h3 class="heading" id="sparc-sun-solaris2*"><span>sparc-sun-solaris2*<a class="copiable-link" href="#sparc-sun-solaris2*"> &para;</a></span></h3>
   1083   1.1    mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1084  1.12    mrg produced are smaller than the ones produced using Solaris native tools;
   1085   1.1    mrg this difference is quite significant for binaries containing debugging
   1086   1.1    mrg information.
   1087  1.10    mrg </p>
   1088  1.10    mrg <p>Starting with Solaris 7, the operating system is capable of executing
   1089   1.1    mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1090  1.19    mrg this; the <samp class="option">-m64</samp> option enables 64-bit code generation.
   1091  1.10    mrg </p>
   1092  1.10    mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1093  1.18    mrg library or the MPC library on Solaris, the canonical target triplet must
   1094  1.19    mrg be specified as the <code class="command">build</code> parameter on the <code class="command">configure</code>
   1095  1.18    mrg line.  This target triplet can be obtained by invoking
   1096  1.19    mrg <code class="command">./config.guess</code> in the toplevel source directory of GCC (and
   1097  1.18    mrg not that of GMP or MPFR or MPC).  For example:
   1098  1.10    mrg </p>
   1099  1.19    mrg <div class="example smallexample">
   1100  1.19    mrg <pre class="example-preformatted">% <var class="var">srcdir</var>/configure --build=sparc-sun-solaris2.11 --prefix=<var class="var">dirname</var>
   1101  1.10    mrg </pre></div>
   1102  1.10    mrg 
   1103  1.10    mrg <hr />
   1104  1.19    mrg <a class="anchor" id="sparc-x-linux"></a><h3 class="heading" id="sparc-*-linux*"><span>sparc-*-linux*<a class="copiable-link" href="#sparc-*-linux*"> &para;</a></span></h3>
   1105  1.10    mrg 
   1106  1.10    mrg <hr />
   1107  1.19    mrg <a class="anchor" id="sparc64-x-solaris2"></a><h3 class="heading" id="sparc64-*-solaris2*"><span>sparc64-*-solaris2*<a class="copiable-link" href="#sparc64-*-solaris2*"> &para;</a></span></h3>
   1108  1.19    mrg <p>This is a synonym for &lsquo;<samp class="samp">sparcv9-*-solaris2*</samp>&rsquo;.
   1109  1.18    mrg </p>
   1110  1.18    mrg <hr />
   1111  1.19    mrg <a class="anchor" id="sparcv9-x-solaris2"></a><h3 class="heading" id="sparcv9-*-solaris2*"><span>sparcv9-*-solaris2*<a class="copiable-link" href="#sparcv9-*-solaris2*"> &para;</a></span></h3>
   1112  1.18    mrg 
   1113  1.12    mrg <p>When configuring a 64-bit-default GCC on Solaris/SPARC, you must use a
   1114  1.12    mrg build compiler that generates 64-bit code, either by default or by
   1115  1.19    mrg specifying &lsquo;<samp class="samp">CC='gcc -m64' CXX='g++ -m64' GDC='gdc -m64'</samp>&rsquo; to <code class="command">configure</code>.
   1116  1.19    mrg Additionally, you <em class="emph">must</em> pass <samp class="option">--build=sparcv9-sun-solaris2.11</samp>
   1117  1.19    mrg or <samp class="option">--build=sparc64-sun-solaris2.11</samp> because <samp class="file">config.guess</samp>
   1118  1.12    mrg misdetects this situation, which can cause build failures.
   1119  1.12    mrg </p>
   1120   1.3  skrll <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1121   1.3  skrll library or the MPC library, the canonical target triplet must be specified
   1122  1.19    mrg as the <code class="command">build</code> parameter on the <code class="command">configure</code> line.  For example:
   1123  1.10    mrg </p>
   1124  1.19    mrg <div class="example smallexample">
   1125  1.19    mrg <pre class="example-preformatted">% <var class="var">srcdir</var>/configure --build=sparcv9-sun-solaris2.11 --prefix=<var class="var">dirname</var>
   1126  1.10    mrg </pre></div>
   1127  1.10    mrg 
   1128  1.10    mrg <hr />
   1129  1.19    mrg <a class="anchor" id="c6x-x-x"></a><h3 class="heading" id="c6x-*-*"><span>c6x-*-*<a class="copiable-link" href="#c6x-*-*"> &para;</a></span></h3>
   1130   1.3  skrll <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1131  1.10    mrg </p>
   1132  1.10    mrg <hr />
   1133  1.19    mrg <a class="anchor" id="visium-x-elf"></a><h3 class="heading" id="visium-*-elf"><span>visium-*-elf<a class="copiable-link" href="#visium-*-elf"> &para;</a></span></h3>
   1134  1.10    mrg <p>CDS VISIUMcore processor.
   1135   1.5    mrg This configuration is intended for embedded systems.
   1136  1.10    mrg </p>
   1137  1.10    mrg <hr />
   1138  1.19    mrg <a class="anchor" id="x-x-vxworks"></a><h3 class="heading" id="g_t*-*-vxworks*"><span>*-*-vxworks*<a class="copiable-link" href="#g_t*-*-vxworks*"> &para;</a></span></h3>
   1139  1.19    mrg <p>Support for VxWorks is in flux.  At present GCC supports <em class="emph">only</em> the
   1140  1.10    mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC.
   1141  1.10    mrg We welcome patches for other architectures supported by VxWorks 5.5.
   1142   1.1    mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1143   1.1    mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1144   1.1    mrg not interested in supporting older, a.out or COFF-based, versions of
   1145   1.1    mrg VxWorks in GCC 3.
   1146  1.10    mrg </p>
   1147  1.10    mrg <p>VxWorks comes with an older version of GCC installed in
   1148  1.19    mrg <samp class="file"><var class="var">$WIND_BASE</var>/host</samp>; we recommend you do not overwrite it.
   1149  1.19    mrg Choose an installation <var class="var">prefix</var> entirely outside <var class="var">$WIND_BASE</var>.
   1150  1.19    mrg Before running <code class="command">configure</code>, create the directories <samp class="file"><var class="var">prefix</var></samp>
   1151  1.19    mrg and <samp class="file"><var class="var">prefix</var>/bin</samp>.  Link or copy the appropriate assembler,
   1152  1.19    mrg linker, etc. into <samp class="file"><var class="var">prefix</var>/bin</samp>, and set your <var class="var">PATH</var> to
   1153  1.19    mrg include that directory while running both <code class="command">configure</code> and
   1154  1.19    mrg <code class="command">make</code>.
   1155  1.10    mrg </p>
   1156  1.19    mrg <p>You must give <code class="command">configure</code> the
   1157  1.19    mrg <samp class="option">--with-headers=<var class="var">$WIND_BASE</var>/target/h</samp> switch so that it can
   1158   1.1    mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1159  1.19    mrg target only, you must also specify <samp class="option">--target=<var class="var">target</var></samp>.
   1160  1.19    mrg <code class="command">configure</code> will attempt to create the directory
   1161  1.19    mrg <samp class="file"><var class="var">prefix</var>/<var class="var">target</var>/sys-include</samp> and copy files into it;
   1162  1.19    mrg make sure the user running <code class="command">configure</code> has sufficient privilege
   1163   1.1    mrg to do so.
   1164  1.10    mrg </p>
   1165  1.10    mrg <p>GCC&rsquo;s exception handling runtime requires a special &ldquo;configlette&rdquo;
   1166  1.19    mrg module, <samp class="file">contrib/gthr_supp_vxw_5x.c</samp>.  Follow the instructions in
   1167   1.1    mrg that file to add the module to your kernel build.  (Future versions of
   1168   1.1    mrg VxWorks will incorporate this module.)
   1169  1.10    mrg </p>
   1170  1.10    mrg <hr />
   1171  1.19    mrg <a class="anchor" id="x86-64-x-x"></a><h3 class="heading" id="x86_005f64-*-*_002c-amd64-*-*"><span>x86_64-*-*, amd64-*-*<a class="copiable-link" href="#x86_005f64-*-*_002c-amd64-*-*"> &para;</a></span></h3>
   1172   1.1    mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1173  1.10    mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD.
   1174   1.1    mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1175  1.19    mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp class="option">-m32</samp> switch).
   1176  1.10    mrg </p>
   1177  1.10    mrg <hr />
   1178  1.19    mrg <a class="anchor" id="x86-64-x-solaris2"></a><h3 class="heading" id="x86_005f64-*-solaris2*"><span>x86_64-*-solaris2*<a class="copiable-link" href="#x86_005f64-*-solaris2*"> &para;</a></span></h3>
   1179   1.3  skrll <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1180  1.19    mrg processor (&lsquo;<samp class="samp">amd64-*-*</samp>&rsquo; is an alias for &lsquo;<samp class="samp">x86_64-*-*</samp>&rsquo;).
   1181  1.18    mrg Unlike other systems, without special options a
   1182   1.3  skrll bi-arch compiler is built which generates 32-bit code by default, but
   1183  1.19    mrg can generate 64-bit x86-64 code with the <samp class="option">-m64</samp> switch.  Since
   1184   1.7    mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1185  1.19    mrg can generate 32-bit code with <samp class="option">-m32</samp>.  To configure and build
   1186  1.19    mrg this way, you have to provide all support libraries like <samp class="file">libgmp</samp>
   1187  1.19    mrg as 64-bit code, configure with <samp class="option">--target=x86_64-pc-solaris2.11</samp>
   1188  1.19    mrg and &lsquo;<samp class="samp">CC=gcc -m64</samp>&rsquo;.
   1189  1.10    mrg </p>
   1190  1.10    mrg <hr />
   1191  1.19    mrg <a class="anchor" id="xtensa-x-elf"></a><h3 class="heading" id="xtensa*-*-elf"><span>xtensa*-*-elf<a class="copiable-link" href="#xtensa*-*-elf"> &para;</a></span></h3>
   1192   1.1    mrg <p>This target is intended for embedded Xtensa systems using the
   1193  1.19    mrg &lsquo;<samp class="samp">newlib</samp>&rsquo; C library.  It uses ELF but does not support shared
   1194   1.1    mrg objects.  Designed-defined instructions specified via the
   1195   1.1    mrg Tensilica Instruction Extension (TIE) language are only supported
   1196   1.1    mrg through inline assembly.
   1197  1.10    mrg </p>
   1198  1.10    mrg <p>The Xtensa configuration information must be specified prior to
   1199  1.19    mrg building GCC.  The <samp class="file">include/xtensa-config.h</samp> header
   1200   1.1    mrg file contains the configuration information.  If you created your
   1201   1.1    mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1202   1.1    mrg downloaded files include a customized copy of this header file,
   1203   1.1    mrg which you can use to replace the default header file.
   1204  1.10    mrg </p>
   1205  1.10    mrg <hr />
   1206  1.19    mrg <a class="anchor" id="xtensa-x-linux"></a><h3 class="heading" id="xtensa*-*-linux*"><span>xtensa*-*-linux*<a class="copiable-link" href="#xtensa*-*-linux*"> &para;</a></span></h3>
   1207   1.1    mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1208   1.1    mrg shared objects and the GNU C library (glibc).  It also generates
   1209   1.1    mrg position-independent code (PIC) regardless of whether the
   1210  1.19    mrg <samp class="option">-fpic</samp> or <samp class="option">-fPIC</samp> options are used.  In other
   1211   1.1    mrg respects, this target is the same as the
   1212  1.19    mrg <a class="uref" href="#xtensa*-*-elf">&lsquo;<samp class="samp">xtensa*-*-elf</samp>&rsquo;</a> target.
   1213  1.10    mrg </p>
   1214  1.10    mrg <hr />
   1215  1.19    mrg <a class="anchor" id="windows"></a><h3 class="heading" id="Microsoft-Windows"><span>Microsoft Windows<a class="copiable-link" href="#Microsoft-Windows"> &para;</a></span></h3>
   1216   1.1    mrg 
   1217  1.19    mrg <h4 class="subheading" id="Intel-16-bit-versions"><span>Intel 16-bit versions<a class="copiable-link" href="#Intel-16-bit-versions"> &para;</a></span></h4>
   1218   1.1    mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1219   1.1    mrg supported.
   1220  1.10    mrg </p>
   1221  1.10    mrg <p>However, the 32-bit port has limited support for Microsoft
   1222   1.1    mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1223  1.10    mrg </p>
   1224  1.19    mrg <h4 class="subheading" id="Intel-32-bit-versions"><span>Intel 32-bit versions<a class="copiable-link" href="#Intel-32-bit-versions"> &para;</a></span></h4>
   1225   1.1    mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1226   1.1    mrg XP, and Windows Vista, are supported by several different target
   1227   1.1    mrg platforms.  These targets differ in which Windows subsystem they target
   1228   1.1    mrg and which C libraries are used.
   1229  1.10    mrg </p>
   1230  1.19    mrg <ul class="itemize mark-bullet">
   1231  1.19    mrg <li>Cygwin <a class="uref" href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1232  1.10    mrg Linux API emulation layer in the Win32 subsystem.
   1233  1.19    mrg </li><li>MinGW <a class="uref" href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1234  1.10    mrg the Win32 subsystem that provides a subset of POSIX.
   1235  1.19    mrg </li><li>MKS i386-pc-mks: NuTCracker from MKS.  See
   1236  1.19    mrg <a class="uref" href="https://www.mkssoftware.com">https://www.mkssoftware.com</a> for more information.
   1237  1.10    mrg </li></ul>
   1238   1.1    mrg 
   1239  1.19    mrg <h4 class="subheading" id="Intel-64-bit-versions"><span>Intel 64-bit versions<a class="copiable-link" href="#Intel-64-bit-versions"> &para;</a></span></h4>
   1240   1.1    mrg <p>GCC contains support for x86-64 using the mingw-w64
   1241  1.19    mrg runtime library, available from <a class="uref" href="https://www.mingw-w64.org/downloads/">https://www.mingw-w64.org/downloads/</a>.
   1242   1.1    mrg This library should be used with the target triple x86_64-pc-mingw32.
   1243  1.10    mrg </p>
   1244  1.19    mrg <h4 class="subheading" id="Windows-CE"><span>Windows CE<a class="copiable-link" href="#Windows-CE"> &para;</a></span></h4>
   1245   1.3  skrll <p>Windows CE is supported as a target only on Hitachi
   1246   1.1    mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1247  1.10    mrg </p>
   1248  1.19    mrg <h4 class="subheading" id="Other-Windows-Platforms"><span>Other Windows Platforms<a class="copiable-link" href="#Other-Windows-Platforms"> &para;</a></span></h4>
   1249   1.1    mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1250  1.10    mrg </p>
   1251  1.10    mrg <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1252   1.1    mrg support the Interix subsystem.  See above.
   1253  1.10    mrg </p>
   1254  1.10    mrg <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1255  1.10    mrg </p>
   1256  1.10    mrg <p>UWIN support has been removed due to a lack of maintenance.
   1257  1.10    mrg </p>
   1258  1.10    mrg <hr />
   1259  1.19    mrg <a class="anchor" id="x-x-cygwin"></a><h3 class="heading" id="g_t*-*-cygwin"><span>*-*-cygwin<a class="copiable-link" href="#g_t*-*-cygwin"> &para;</a></span></h3>
   1260   1.1    mrg <p>Ports of GCC are included with the
   1261  1.19    mrg <a class="uref" href="http://www.cygwin.com/">Cygwin environment</a>.
   1262  1.10    mrg </p>
   1263  1.10    mrg <p>GCC will build under Cygwin without modification; it does not build
   1264  1.10    mrg with Microsoft&rsquo;s C++ compiler and there are no plans to make it do so.
   1265  1.10    mrg </p>
   1266  1.10    mrg <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1267   1.1    mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1268   1.1    mrg used with as up-to-date a version of binutils as possible; use either
   1269   1.1    mrg the latest official GNU binutils release in the Cygwin distribution,
   1270   1.1    mrg or version 2.20 or above if building your own.
   1271  1.10    mrg </p>
   1272  1.10    mrg <hr />
   1273  1.19    mrg <a class="anchor" id="x-x-mingw32"></a><h3 class="heading" id="g_t*-*-mingw32"><span>*-*-mingw32<a class="copiable-link" href="#g_t*-*-mingw32"> &para;</a></span></h3>
   1274  1.10    mrg <p>GCC will build with and support only MinGW runtime 3.12 and later.
   1275   1.1    mrg Earlier versions of headers are incompatible with the new default semantics
   1276  1.19    mrg of <code class="code">extern inline</code> in <code class="code">-std=c99</code> and <code class="code">-std=gnu99</code> modes.
   1277  1.10    mrg </p>
   1278  1.15    mrg <p>To support emitting DWARF debugging info you need to use GNU binutils
   1279  1.19    mrg version 2.16 or above containing support for the <code class="code">.secrel32</code>
   1280  1.15    mrg assembler pseudo-op.
   1281  1.15    mrg </p>
   1282  1.10    mrg <hr />
   1283  1.19    mrg <a class="anchor" id="older"></a><h3 class="heading" id="Older-systems"><span>Older systems<a class="copiable-link" href="#Older-systems"> &para;</a></span></h3>
   1284   1.1    mrg <p>GCC contains support files for many older (1980s and early
   1285   1.1    mrg 1990s) Unix variants.  For the most part, support for these systems
   1286   1.1    mrg has not been deliberately removed, but it has not been maintained for
   1287   1.1    mrg several years and may suffer from bitrot.
   1288  1.10    mrg </p>
   1289  1.10    mrg <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems.
   1290   1.1    mrg Support for these systems is still present in that release, but
   1291  1.19    mrg <code class="command">configure</code> will fail unless the <samp class="option">--enable-obsolete</samp>
   1292   1.1    mrg option is given.  Unless a maintainer steps forward, support for these
   1293   1.1    mrg systems will be removed from the next release of GCC.
   1294  1.10    mrg </p>
   1295  1.10    mrg <p>Support for old systems as hosts for GCC can cause problems if the
   1296   1.1    mrg workarounds for compiler, library and operating system bugs affect the
   1297   1.1    mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1298   1.1    mrg bring GCC up on such a system, if still possible with current GCC, may
   1299   1.1    mrg require first installing an old version of GCC which did work on that
   1300   1.1    mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1301   1.1    mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1302  1.19    mrg <samp class="file">old-releases</samp> directory on the <a class="uref" href="../mirrors.html">GCC mirror
   1303  1.10    mrg sites</a>.  Header bugs may generally be avoided using
   1304  1.19    mrg <code class="command">fixincludes</code>, but bugs or deficiencies in libraries and the
   1305   1.1    mrg operating system may still cause problems.
   1306  1.10    mrg </p>
   1307  1.10    mrg <p>Support for older systems as targets for cross-compilation is less
   1308   1.1    mrg problematic than support for them as hosts for GCC; if an enthusiast
   1309   1.1    mrg wishes to make such a target work again (including resurrecting any of
   1310   1.1    mrg the targets that never worked with GCC 2, starting from the last
   1311   1.1    mrg version before they were removed), patches
   1312  1.19    mrg <a class="uref" href="../contribute.html">following the usual requirements</a> would be
   1313   1.1    mrg likely to be accepted, since they should not affect the support for more
   1314   1.1    mrg modern targets.
   1315  1.10    mrg </p>
   1316  1.10    mrg <p>For some systems, old versions of GNU binutils may also be useful,
   1317  1.19    mrg and are available from <samp class="file">pub/binutils/old-releases</samp> on
   1318  1.19    mrg <a class="uref" href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1319  1.10    mrg </p>
   1320  1.10    mrg <p>Some of the information on specific systems above relates to
   1321   1.1    mrg such older systems, but much of the information
   1322   1.1    mrg about GCC on such systems (which may no longer be applicable to
   1323   1.1    mrg current GCC) is to be found in the GCC texinfo manual.
   1324  1.10    mrg </p>
   1325  1.10    mrg <hr />
   1326  1.19    mrg <a class="anchor" id="elf"></a><h3 class="heading" id="all-ELF-targets-_0028SVR4_002c-Solaris_002c-etc_002e_0029"><span>all ELF targets (SVR4, Solaris, etc.)<a class="copiable-link" href="#all-ELF-targets-_0028SVR4_002c-Solaris_002c-etc_002e_0029"> &para;</a></span></h3>
   1327   1.1    mrg <p>C++ support is significantly better on ELF targets if you use the
   1328  1.19    mrg <a class="uref" href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1329   1.1    mrg inlines, vtables and template instantiations will be discarded
   1330   1.1    mrg automatically.
   1331  1.10    mrg </p>
   1332   1.1    mrg 
   1333  1.10    mrg <hr />
   1334  1.10    mrg <p>
   1335  1.19    mrg <p><a class="uref" href="./index.html">Return to the GCC Installation page</a>
   1336  1.10    mrg </p>
   1337  1.10    mrg 
   1338  1.10    mrg 
   1339  1.10    mrg 
   1340  1.10    mrg 
   1341   1.1    mrg 
   1342  1.10    mrg </body>
   1343  1.10    mrg </html>
   1344