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     25  1.12    mrg <title>Host/Target specific installation notes for GCC</title>
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     61   1.9    mrg </head>
     62   1.8    mrg 
     63  1.10    mrg <body lang="en">
     64  1.12    mrg <h1 class="settitle" align="center">Host/Target specific installation notes for GCC</h1>
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     91  1.18    mrg 
     92  1.17    mrg <a name="index-Specific"></a>
     93  1.17    mrg <a name="index-Specific-installation-notes"></a>
     94  1.17    mrg <a name="index-Target-specific-installation"></a>
     95  1.17    mrg <a name="index-Host-specific-installation"></a>
     96  1.17    mrg <a name="index-Target-specific-installation-notes"></a>
     97   1.6    mrg 
     98  1.10    mrg <p>Please read this document carefully <em>before</em> installing the
     99  1.10    mrg GNU Compiler Collection on your machine.
    100  1.10    mrg </p>
    101  1.10    mrg <p>Note that this list of install notes is <em>not</em> a list of supported
    102  1.10    mrg hosts or targets.  Not all supported hosts and targets are listed
    103  1.10    mrg here, only the ones that require host-specific or target-specific
    104  1.10    mrg information have to. 
    105  1.10    mrg </p>
    106  1.10    mrg <ul>
    107  1.10    mrg <li> <a href="#aarch64-x-x">aarch64*-*-*</a>
    108  1.15    mrg </li><li> <a href="#amdgcn-x-amdhsa">amdgcn-*-amdhsa</a>
    109  1.12    mrg </li><li> <a href="#amd64-x-solaris2">amd64-*-solaris2*</a>
    110  1.15    mrg </li><li> <a href="#arc-x-elf32">arc-*-elf32</a>
    111  1.15    mrg </li><li> <a href="#arc-linux-uclibc">arc-linux-uclibc</a>
    112  1.10    mrg </li><li> <a href="#arm-x-eabi">arm-*-eabi</a>
    113  1.10    mrg </li><li> <a href="#avr">avr</a>
    114  1.10    mrg </li><li> <a href="#bfin">Blackfin</a>
    115  1.15    mrg </li><li> <a href="#cris">cris</a>
    116  1.10    mrg </li><li> <a href="#dos">DOS</a>
    117  1.15    mrg </li><li> <a href="#epiphany-x-elf">epiphany-*-elf</a>
    118  1.15    mrg </li><li> <a href="#ft32-x-elf">ft32-*-elf</a>
    119  1.10    mrg </li><li> <a href="#x-x-freebsd">*-*-freebsd*</a>
    120  1.10    mrg </li><li> <a href="#h8300-hms">h8300-hms</a>
    121  1.10    mrg </li><li> <a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
    122  1.10    mrg </li><li> <a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
    123  1.10    mrg </li><li> <a href="#x-x-linux-gnu">*-*-linux-gnu</a>
    124  1.10    mrg </li><li> <a href="#ix86-x-linux">i?86-*-linux*</a>
    125  1.12    mrg </li><li> <a href="#ix86-x-solaris2">i?86-*-solaris2*</a>
    126  1.10    mrg </li><li> <a href="#ia64-x-linux">ia64-*-linux</a>
    127  1.10    mrg </li><li> <a href="#ia64-x-hpux">ia64-*-hpux*</a>
    128  1.10    mrg </li><li> <a href="#x-ibm-aix">*-ibm-aix*</a>
    129  1.10    mrg </li><li> <a href="#iq2000-x-elf">iq2000-*-elf</a>
    130  1.15    mrg </li><li> <a href="#loongarch">loongarch</a>
    131  1.10    mrg </li><li> <a href="#lm32-x-elf">lm32-*-elf</a>
    132  1.10    mrg </li><li> <a href="#lm32-x-uclinux">lm32-*-uclinux</a>
    133  1.10    mrg </li><li> <a href="#m32c-x-elf">m32c-*-elf</a>
    134  1.10    mrg </li><li> <a href="#m32r-x-elf">m32r-*-elf</a>
    135  1.10    mrg </li><li> <a href="#m68k-x-x">m68k-*-*</a>
    136  1.15    mrg </li><li> <a href="#m68k-x-uclinux">m68k-*-uclinux</a>
    137  1.10    mrg </li><li> <a href="#microblaze-x-elf">microblaze-*-elf</a>
    138  1.10    mrg </li><li> <a href="#mips-x-x">mips-*-*</a>
    139  1.15    mrg </li><li> <a href="#moxie-x-elf">moxie-*-elf</a>
    140  1.15    mrg </li><li> <a href="#msp430-x-elf">msp430-*-elf</a>
    141  1.10    mrg </li><li> <a href="#nds32le-x-elf">nds32le-*-elf</a>
    142  1.10    mrg </li><li> <a href="#nds32be-x-elf">nds32be-*-elf</a>
    143  1.10    mrg </li><li> <a href="#nvptx-x-none">nvptx-*-none</a>
    144  1.11    mrg </li><li> <a href="#or1k-x-elf">or1k-*-elf</a>
    145  1.11    mrg </li><li> <a href="#or1k-x-linux">or1k-*-linux</a>
    146  1.10    mrg </li><li> <a href="#powerpc-x-x">powerpc*-*-*</a>
    147  1.10    mrg </li><li> <a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
    148  1.10    mrg </li><li> <a href="#powerpc-x-elf">powerpc-*-elf</a>
    149  1.10    mrg </li><li> <a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
    150  1.10    mrg </li><li> <a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
    151  1.10    mrg </li><li> <a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
    152  1.10    mrg </li><li> <a href="#powerpc-x-eabi">powerpc-*-eabi</a>
    153  1.10    mrg </li><li> <a href="#powerpcle-x-elf">powerpcle-*-elf</a>
    154  1.10    mrg </li><li> <a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
    155  1.10    mrg </li><li> <a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
    156  1.10    mrg </li><li> <a href="#riscv32-x-elf">riscv32-*-elf</a>
    157  1.10    mrg </li><li> <a href="#riscv32-x-linux">riscv32-*-linux</a>
    158  1.10    mrg </li><li> <a href="#riscv64-x-elf">riscv64-*-elf</a>
    159  1.10    mrg </li><li> <a href="#riscv64-x-linux">riscv64-*-linux</a>
    160  1.15    mrg </li><li> <a href="#rl78-x-elf">rl78-*-elf</a>
    161  1.15    mrg </li><li> <a href="#rx-x-elf">rx-*-elf</a>
    162  1.10    mrg </li><li> <a href="#s390-x-linux">s390-*-linux*</a>
    163  1.10    mrg </li><li> <a href="#s390x-x-linux">s390x-*-linux*</a>
    164  1.10    mrg </li><li> <a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    165  1.10    mrg </li><li> <a href="#x-x-solaris2">*-*-solaris2*</a>
    166  1.10    mrg </li><li> <a href="#sparc-x-x">sparc*-*-*</a>
    167  1.10    mrg </li><li> <a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    168  1.10    mrg </li><li> <a href="#sparc-x-linux">sparc-*-linux*</a>
    169  1.10    mrg </li><li> <a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    170  1.10    mrg </li><li> <a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    171  1.10    mrg </li><li> <a href="#c6x-x-x">c6x-*-*</a>
    172  1.10    mrg </li><li> <a href="#visium-x-elf">visium-*-elf</a>
    173  1.10    mrg </li><li> <a href="#x-x-vxworks">*-*-vxworks*</a>
    174  1.10    mrg </li><li> <a href="#x86-64-x-x">x86_64-*-*, amd64-*-*</a>
    175  1.12    mrg </li><li> <a href="#x86-64-x-solaris2">x86_64-*-solaris2*</a>
    176  1.10    mrg </li><li> <a href="#xtensa-x-elf">xtensa*-*-elf</a>
    177  1.10    mrg </li><li> <a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    178  1.10    mrg </li><li> <a href="#windows">Microsoft Windows</a>
    179  1.10    mrg </li><li> <a href="#x-x-cygwin">*-*-cygwin</a>
    180  1.10    mrg </li><li> <a href="#x-x-mingw32">*-*-mingw32</a>
    181  1.10    mrg </li><li> <a href="#os2">OS/2</a>
    182  1.10    mrg </li><li> <a href="#older">Older systems</a>
    183  1.10    mrg </li></ul>
    184  1.10    mrg 
    185  1.10    mrg <ul>
    186  1.18    mrg <li> <a href="#elf">all ELF targets</a> (SVR4, Solaris, etc.)
    187  1.10    mrg </li></ul>
    188  1.10    mrg 
    189  1.10    mrg 
    190  1.10    mrg <!-- -------- host/target specific issues start here ---------------- -->
    191  1.10    mrg <hr />
    192  1.17    mrg <a name="aarch64-x-x"></a><a name="aarch64*-*-*"></a>
    193  1.17    mrg <h3 class="heading">aarch64*-*-*</h3>
    194  1.10    mrg <p>Binutils pre 2.24 does not have support for selecting <samp>-mabi</samp> and
    195  1.10    mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    196  1.10    mrg not support option <samp>-mabi=ilp32</samp>.
    197  1.10    mrg </p>
    198  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    199  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    200  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> option.  This will enable the fix by
    201  1.10    mrg default and can be explicitly disabled during compilation by passing the
    202  1.10    mrg <samp>-mno-fix-cortex-a53-835769</samp> option.  Conversely,
    203  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> will disable the workaround by
    204  1.10    mrg default.  The workaround is disabled by default if neither of
    205  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> or
    206  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> is given at configure time.
    207  1.10    mrg </p>
    208  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    209  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    210  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> option.  This workaround is applied at
    211  1.10    mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    212  1.10    mrg to the linker.  It can be explicitly disabled during compilation by passing the
    213  1.10    mrg <samp>-mno-fix-cortex-a53-843419</samp> option.  Conversely,
    214  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> will disable the workaround by default.
    215  1.10    mrg The workaround is disabled by default if neither of
    216  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> or
    217  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> is given at configure time.
    218  1.10    mrg </p>
    219  1.11    mrg <p>To enable Branch Target Identification Mechanism and Return Address Signing by
    220  1.11    mrg default at configure time use the <samp>--enable-standard-branch-protection</samp>
    221  1.11    mrg option.  This is equivalent to having <samp>-mbranch-protection=standard</samp>
    222  1.11    mrg during compilation.  This can be explicitly disabled during compilation by
    223  1.11    mrg passing the <samp>-mbranch-protection=none</samp> option which turns off all
    224  1.11    mrg types of branch protections.  Conversely,
    225  1.11    mrg <samp>--disable-standard-branch-protection</samp> will disable both the
    226  1.11    mrg protections by default.  This mechanism is turned off by default if neither
    227  1.11    mrg of the options are given at configure time.
    228  1.11    mrg </p>
    229  1.10    mrg <hr />
    230  1.17    mrg <a name="amd64-x-solaris2"></a><a name="amd64-*-solaris2*"></a>
    231  1.17    mrg <h3 class="heading">amd64-*-solaris2*</h3>
    232  1.12    mrg <p>This is a synonym for &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo;.
    233  1.10    mrg </p>
    234  1.10    mrg <hr />
    235  1.17    mrg <a name="amdgcn-x-amdhsa"></a><a name="amdgcn-*-amdhsa"></a>
    236  1.17    mrg <h3 class="heading">amdgcn-*-amdhsa</h3>
    237  1.11    mrg <p>AMD GCN GPU target.
    238  1.11    mrg </p>
    239  1.18    mrg <p>Instead of GNU Binutils, you will need to install LLVM 15, or later, and copy
    240  1.12    mrg <samp>bin/llvm-mc</samp> to <samp>amdgcn-amdhsa/bin/as</samp>,
    241  1.12    mrg <samp>bin/lld</samp> to <samp>amdgcn-amdhsa/bin/ld</samp>,
    242  1.12    mrg <samp>bin/llvm-nm</samp> to <samp>amdgcn-amdhsa/bin/nm</samp>, and
    243  1.12    mrg <samp>bin/llvm-ar</samp> to both <samp>bin/amdgcn-amdhsa-ar</samp> and
    244  1.18    mrg <samp>bin/amdgcn-amdhsa-ranlib</samp>.  Note that LLVM 13.0.1 or LLVM 14 can be used
    245  1.18    mrg by specifying a <code>--with-multilib-list=</code> that does not list <code>gfx1100</code>
    246  1.18    mrg and <code>gfx1103</code>.
    247  1.18    mrg </p>
    248  1.18    mrg <p>Use Newlib (4.3.0 or newer; 4.4.0 contains some improvements and git commit
    249  1.18    mrg 7dd4eb1db (2025-03-25, post-4.4.0) fixes device console output for GFX10 and
    250  1.18    mrg GFX11 devices).
    251  1.11    mrg </p>
    252  1.11    mrg <p>To run the binaries, install the HSA Runtime from the
    253  1.18    mrg <a href="https://rocm.docs.amd.com/">ROCm Platform</a>, and use
    254  1.12    mrg <samp>libexec/gcc/amdhsa-amdhsa/<var>version</var>/gcn-run</samp> to launch them
    255  1.11    mrg on the GPU.
    256  1.11    mrg </p>
    257  1.18    mrg <p>To enable support for GCN3 Fiji devices (gfx803), GCC has to be configured with
    258  1.18    mrg <samp>--with-arch=<code>fiji</code></samp> or
    259  1.18    mrg <samp>--with-multilib-list=<code>fiji</code>,...</samp>.  Note that support for Fiji
    260  1.18    mrg devices has been removed in ROCm 4.0 and support in LLVM was deprecated and has
    261  1.18    mrg been removed in LLVM 18.
    262  1.18    mrg </p>
    263  1.11    mrg <hr />
    264  1.17    mrg <a name="arc-x-elf32"></a><a name="arc-*-elf32"></a>
    265  1.17    mrg <h3 class="heading">arc-*-elf32</h3>
    266  1.10    mrg 
    267  1.10    mrg <p>Use &lsquo;<samp>configure --target=arc-elf32 --with-cpu=<var>cpu</var> --enable-languages=&quot;c,c++&quot;</samp>&rsquo;
    268  1.10    mrg to configure GCC, with <var>cpu</var> being one of &lsquo;<samp>arc600</samp>&rsquo;, &lsquo;<samp>arc601</samp>&rsquo;,
    269  1.10    mrg or &lsquo;<samp>arc700</samp>&rsquo;.
    270  1.10    mrg </p>
    271  1.10    mrg <hr />
    272  1.17    mrg <a name="arc-linux-uclibc"></a><a name="arc-linux-uclibc-1"></a>
    273  1.17    mrg <h3 class="heading">arc-linux-uclibc</h3>
    274  1.10    mrg 
    275  1.10    mrg <p>Use &lsquo;<samp>configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages=&quot;c,c++&quot;</samp>&rsquo; to configure GCC.
    276  1.10    mrg </p>
    277  1.10    mrg <hr />
    278  1.17    mrg <a name="arm-x-eabi"></a><a name="arm-*-eabi"></a>
    279  1.17    mrg <h3 class="heading">arm-*-eabi</h3>
    280   1.9    mrg <p>ARM-family processors.
    281  1.10    mrg </p>
    282  1.10    mrg <p>Building the Ada frontend commonly fails (an infinite loop executing
    283   1.7    mrg <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    284   1.7    mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    285  1.10    mrg </p>
    286  1.10    mrg <hr />
    287  1.17    mrg <a name="avr"></a><a name="avr-1"></a>
    288  1.17    mrg <h3 class="heading">avr</h3>
    289   1.1    mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    290  1.10    mrg applications.  There are no standard Unix configurations.
    291   1.1    mrg See &ldquo;AVR Options&rdquo; in the main manual
    292   1.1    mrg for the list of supported MCU types.
    293  1.10    mrg </p>
    294  1.10    mrg <p>Use &lsquo;<samp>configure --target=avr --enable-languages=&quot;c&quot;</samp>&rsquo; to configure GCC.
    295  1.10    mrg </p>
    296  1.10    mrg <p>Further installation notes and other useful information about AVR tools
    297   1.1    mrg can also be obtained from:
    298  1.10    mrg </p>
    299  1.10    mrg <ul>
    300  1.10    mrg <li> <a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    301  1.10    mrg </li><li> <a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    302  1.10    mrg </li></ul>
    303  1.10    mrg 
    304  1.10    mrg <p>The following error:
    305  1.17    mrg </p><div class="smallexample">
    306  1.17    mrg <pre class="smallexample">Error: register required
    307  1.10    mrg </pre></div>
    308  1.10    mrg 
    309  1.10    mrg <p>indicates that you should upgrade to a newer version of the binutils.
    310  1.10    mrg </p>
    311  1.10    mrg <hr />
    312  1.17    mrg <a name="bfin"></a><a name="Blackfin"></a>
    313  1.17    mrg <h3 class="heading">Blackfin</h3>
    314  1.10    mrg <p>The Blackfin processor, an Analog Devices DSP.
    315   1.1    mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    316  1.10    mrg </p>
    317  1.10    mrg <p>More information, and a version of binutils with support for this processor,
    318  1.12    mrg are available at <a href="https://sourceforge.net/projects/adi-toolchain/">https://sourceforge.net/projects/adi-toolchain/</a>.
    319  1.10    mrg </p>
    320  1.10    mrg <hr />
    321  1.17    mrg <a name="cris"></a><a name="CRIS"></a>
    322  1.17    mrg <h3 class="heading">CRIS</h3>
    323  1.15    mrg <p>CRIS is a CPU architecture in Axis Communications systems-on-a-chip, for
    324  1.15    mrg example the ETRAX series.  These are used in embedded applications.
    325  1.10    mrg </p>
    326  1.10    mrg <p>See &ldquo;CRIS Options&rdquo; in the main manual
    327   1.1    mrg for a list of CRIS-specific options.
    328  1.10    mrg </p>
    329  1.15    mrg <p>Use &lsquo;<samp>configure --target=cris-elf</samp>&rsquo; to configure GCC&nbsp;for building
    330  1.15    mrg a cross-compiler for CRIS.
    331  1.10    mrg <hr />
    332  1.17    mrg <a name="dos"></a></p><a name="DOS"></a>
    333  1.17    mrg <h3 class="heading">DOS</h3>
    334   1.1    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    335  1.10    mrg </p>
    336  1.10    mrg <p>You cannot install GCC by itself on MSDOS; it will not compile under
    337   1.1    mrg any MSDOS compiler except itself.  You need to get the complete
    338   1.1    mrg compilation package DJGPP, which includes binaries as well as sources,
    339   1.1    mrg and includes all the necessary compilation tools and libraries.
    340  1.10    mrg </p>
    341  1.10    mrg <hr />
    342  1.17    mrg <a name="epiphany-x-elf"></a><a name="epiphany-*-elf"></a>
    343  1.17    mrg <h3 class="heading">epiphany-*-elf</h3>
    344  1.10    mrg <p>Adapteva Epiphany.
    345   1.3  skrll This configuration is intended for embedded systems.
    346  1.10    mrg </p>
    347  1.10    mrg <hr />
    348  1.17    mrg <a name="x-x-freebsd"></a><a name="g_t*-*-freebsd*"></a>
    349  1.17    mrg <h3 class="heading">*-*-freebsd*</h3>
    350  1.10    mrg <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    351  1.18    mrg for all CPU architectures.  There are
    352   1.1    mrg no known issues with mixing object files and libraries with different
    353  1.18    mrg debugging formats.
    354  1.18    mrg </p>
    355  1.18    mrg <p>We recommend bootstrapping against the latest GNU binutils or the
    356  1.18    mrg version found in the <samp>devel/binutils</samp> port. This also has been
    357  1.18    mrg known to enable additional features and improve overall testsuite
    358  1.18    mrg results.
    359  1.18    mrg </p>
    360  1.18    mrg <p>Ada and D (or rather their respective libraries) are broken on
    361  1.18    mrg FreeBSD/i386. This also affects building 32-bit libraries on
    362  1.18    mrg FreeBSD/amd64, so configure with <samp>--disable-multilib</samp>
    363  1.18    mrg there in case you are building one of these front ends.
    364  1.18    mrg </p>
    365  1.18    mrg <p>Go (or rather libgo) is generally broken on FreeBSD.
    366  1.10    mrg </p>
    367  1.10    mrg <hr />
    368  1.17    mrg <a name="ft32-x-elf"></a><a name="ft32-*-elf"></a>
    369  1.17    mrg <h3 class="heading">ft32-*-elf</h3>
    370  1.10    mrg <p>The FT32 processor.
    371   1.7    mrg This configuration is intended for embedded systems.
    372  1.10    mrg </p>
    373  1.10    mrg <hr />
    374  1.17    mrg <a name="h8300-hms"></a><a name="h8300-hms-1"></a>
    375  1.17    mrg <h3 class="heading">h8300-hms</h3>
    376   1.1    mrg <p>Renesas H8/300 series of processors.
    377  1.10    mrg </p>
    378  1.10    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    379  1.10    mrg </p>
    380  1.10    mrg <p>The calling convention and structure layout has changed in release 2.6.
    381   1.1    mrg All code must be recompiled.  The calling convention now passes the
    382   1.1    mrg first three arguments in function calls in registers.  Structures are no
    383   1.1    mrg longer a multiple of 2 bytes.
    384  1.10    mrg </p>
    385  1.10    mrg <hr />
    386  1.17    mrg <a name="hppa-hp-hpux"></a><a name="hppa*-hp-hpux*"></a>
    387  1.17    mrg <h3 class="heading">hppa*-hp-hpux*</h3>
    388  1.18    mrg <p>We require using gas on all hppa platforms.  Version 2.19 or
    389   1.1    mrg later is recommended.
    390  1.10    mrg </p>
    391  1.10    mrg <p>It may be helpful to configure GCC with the
    392  1.10    mrg <a href="./configure.html#with-gnu-as"><samp>--with-gnu-as</samp></a> and
    393  1.10    mrg <samp>--with-as=&hellip;</samp> options to ensure that GCC can find GAS.
    394  1.10    mrg </p>
    395  1.10    mrg <p>There are two default scheduling models for instructions.  These are
    396   1.1    mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    397  1.10    mrg architecture specified for the target machine when configuring.
    398   1.1    mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    399  1.10    mrg the target is a &lsquo;<samp>hppa1*</samp>&rsquo; machine.
    400  1.10    mrg </p>
    401  1.10    mrg <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    402   1.1    mrg it is important to completely specify the machine architecture when
    403   1.1    mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    404   1.1    mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    405   1.1    mrg default scheduling model is desired.
    406  1.10    mrg </p>
    407  1.10    mrg <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    408  1.10    mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
    409   1.1    mrg This namespace change might cause problems when bootstrapping with
    410   1.1    mrg an earlier version of GCC or the HP compiler as essentially the same
    411   1.1    mrg namespace is required for an entire build.  This problem can be avoided
    412  1.10    mrg in a number of ways.  With HP cc, <code>UNIX_STD</code> can be set to &lsquo;<samp>95</samp>&rsquo;
    413  1.10    mrg or &lsquo;<samp>98</samp>&rsquo;.  Another way is to add an appropriate set of predefines
    414  1.10    mrg to <code>CC</code>.  The description for the <samp>munix=</samp> option contains
    415   1.1    mrg a list of the predefines used with each standard.
    416  1.10    mrg </p>
    417  1.10    mrg <p>More specific information to &lsquo;<samp>hppa*-hp-hpux*</samp>&rsquo; targets follows.
    418  1.10    mrg </p>
    419  1.10    mrg <hr />
    420  1.17    mrg <a name="hppa-hp-hpux11"></a><a name="hppa*-hp-hpux11"></a>
    421  1.17    mrg <h3 class="heading">hppa*-hp-hpux11</h3>
    422  1.10    mrg <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    423   1.1    mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    424   1.9    mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    425   1.1    mrg only available for the 32-bit PA-RISC runtime.
    426  1.10    mrg </p>
    427  1.10    mrg <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    428  1.10    mrg bundled compiler supports only traditional C; you will need either HP&rsquo;s
    429   1.1    mrg unbundled compiler, or a binary distribution of GCC.
    430  1.10    mrg </p>
    431  1.10    mrg <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    432   1.1    mrg but the process requires several steps.  GCC 3.3 can then be used to
    433   1.9    mrg build later versions.
    434  1.10    mrg </p>
    435  1.10    mrg <p>There are several possible approaches to building the distribution.
    436   1.1    mrg Binutils can be built first using the HP tools.  Then, the GCC
    437   1.1    mrg distribution can be built.  The second approach is to build GCC
    438  1.10    mrg first using the HP tools, then build binutils, then rebuild GCC.
    439   1.1    mrg There have been problems with various binary distributions, so it
    440   1.1    mrg is best not to start from a binary distribution.
    441  1.10    mrg </p>
    442  1.10    mrg <p>On 64-bit capable systems, there are two distinct targets.  Different
    443   1.1    mrg installation prefixes must be used if both are to be installed on
    444  1.10    mrg the same system.  The &lsquo;<samp>hppa[1-2]*-hp-hpux11*</samp>&rsquo; target generates code
    445  1.10    mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker.
    446  1.10    mrg The &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target generates 64-bit code for the
    447   1.1    mrg PA-RISC 2.0 architecture.
    448  1.10    mrg </p>
    449  1.10    mrg <p>The script config.guess now selects the target type based on the compiler
    450  1.10    mrg detected during configuration.  You must define <code>PATH</code> or <code>CC</code> so
    451  1.10    mrg that configure finds an appropriate compiler for the initial bootstrap.
    452  1.10    mrg When <code>CC</code> is used, the definition should contain the options that are
    453  1.10    mrg needed whenever <code>CC</code> is used.
    454  1.10    mrg </p>
    455  1.10    mrg <p>Specifically, options that determine the runtime architecture must be
    456  1.10    mrg in <code>CC</code> to correctly select the target for the build.  It is also
    457  1.10    mrg convenient to place many other compiler options in <code>CC</code>.  For example,
    458  1.10    mrg <code>CC=&quot;cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE&quot;</code>
    459   1.1    mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    460  1.10    mrg 64-bit K&amp;R/bundled mode.  The <samp>+DA2.0W</samp> option will result in
    461  1.10    mrg the automatic selection of the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target.  The
    462   1.1    mrg macro definition table of cpp needs to be increased for a successful
    463   1.1    mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    464   1.1    mrg be defined when building with the bundled compiler, or when using the
    465  1.10    mrg <samp>-Ac</samp> option.  These defines aren&rsquo;t necessary with <samp>-Ae</samp>.
    466  1.10    mrg </p>
    467  1.10    mrg <p>It is best to explicitly configure the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target
    468  1.10    mrg with the <samp>--with-ld=&hellip;</samp> option.  This overrides the standard
    469   1.1    mrg search for ld.  The two linkers supported on this target require different
    470   1.1    mrg commands.  The default linker is determined during configuration.  As a
    471  1.10    mrg result, it&rsquo;s not possible to switch linkers in the middle of a GCC build.
    472   1.1    mrg This has been reported to sometimes occur in unified builds of binutils
    473   1.1    mrg and GCC.
    474  1.10    mrg </p>
    475  1.10    mrg <p>A recent linker patch must be installed for the correct operation of
    476   1.1    mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    477   1.1    mrg oldest linker patches that are known to work.  They are for HP-UX
    478   1.1    mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    479  1.10    mrg <code>PHSS_24304</code>, might be usable but it hasn&rsquo;t been tested.  These
    480   1.1    mrg patches have been superseded.  Consult the HP patch database to obtain
    481   1.1    mrg the currently recommended linker patch for your system.
    482  1.10    mrg </p>
    483  1.10    mrg <p>The patches are necessary for the support of weak symbols on the
    484   1.1    mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    485   1.1    mrg symbols are implemented using SOM secondary definition symbols.  Prior
    486  1.10    mrg to HP-UX 11, there are bugs in the linker support for secondary symbols.
    487   1.1    mrg The patches correct a problem of linker core dumps creating shared
    488   1.1    mrg libraries containing secondary symbols, as well as various other
    489   1.1    mrg linking issues involving secondary symbols.
    490  1.10    mrg </p>
    491  1.10    mrg <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    492   1.1    mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    493  1.10    mrg uses the linker <samp>+init</samp> and <samp>+fini</samp> options for the same
    494   1.1    mrg purpose.  The patches correct various problems with the +init/+fini
    495   1.1    mrg options, including program core dumps.  Binutils 2.14 corrects a
    496  1.10    mrg problem on the 64-bit port resulting from HP&rsquo;s non-standard use of
    497   1.1    mrg the .init and .fini sections for array initializers and finalizers.
    498  1.10    mrg </p>
    499  1.18    mrg <p>Only the HP linker is supported for the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target.
    500  1.10    mrg </p>
    501  1.10    mrg <p>At this time, the GNU linker does not support the creation of long
    502   1.9    mrg branch stubs.  As a result, it cannot successfully link binaries
    503   1.1    mrg containing branch offsets larger than 8 megabytes.  In addition,
    504   1.1    mrg there are problems linking shared libraries, linking executables
    505  1.10    mrg with <samp>-static</samp>, and with dwarf2 unwind and exception support.
    506  1.10    mrg It also doesn&rsquo;t provide stubs for internal calls to global functions
    507   1.9    mrg in shared libraries, so these calls cannot be overloaded.
    508  1.10    mrg </p>
    509  1.10    mrg <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    510   1.1    mrg versioning is not supported.  It may be necessary to disable symbol
    511  1.10    mrg versioning with <samp>--disable-symvers</samp> when using GNU ld.
    512  1.10    mrg </p>
    513  1.10    mrg <p>POSIX threads are the default.  The optional DCE thread library is not
    514  1.10    mrg supported, so <samp>--enable-threads=dce</samp> does not work.
    515  1.10    mrg </p>
    516  1.10    mrg <hr />
    517  1.17    mrg <a name="x-x-linux-gnu"></a><a name="g_t*-*-linux-gnu"></a>
    518  1.17    mrg <h3 class="heading">*-*-linux-gnu</h3>
    519  1.15    mrg <p>The <code>.init_array</code> and <code>.fini_array</code> sections are enabled
    520  1.15    mrg unconditionally which requires at least glibc 2.1 and binutils 2.12.
    521  1.15    mrg </p>
    522   1.1    mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    523   1.1    mrg in glibc 2.2.5 and later.  More information is available in the
    524   1.1    mrg libstdc++-v3 documentation.
    525  1.10    mrg </p>
    526  1.10    mrg <hr />
    527  1.17    mrg <a name="ix86-x-linux"></a><a name="i_003f86-*-linux*"></a>
    528  1.17    mrg <h3 class="heading">i?86-*-linux*</h3>
    529  1.10    mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform.
    530  1.15    mrg See <a href="https://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    531  1.10    mrg </p>
    532  1.10    mrg <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    533   1.1    mrg possible you have a hardware problem.  Further information on this can be
    534  1.15    mrg found on <a href="https://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    535  1.10    mrg </p>
    536  1.10    mrg <hr />
    537  1.17    mrg <a name="ix86-x-solaris2"></a><a name="i_003f86-*-solaris2*"></a>
    538  1.17    mrg <h3 class="heading">i?86-*-solaris2*</h3>
    539  1.12    mrg <p>Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
    540  1.12    mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp>amd64-*-solaris2*</samp>&rsquo; or
    541  1.12    mrg &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo; configuration that corresponds to
    542  1.10    mrg &lsquo;<samp>sparcv9-sun-solaris2*</samp>&rsquo;.
    543  1.10    mrg </p>
    544  1.10    mrg <hr />
    545  1.17    mrg <a name="ia64-x-linux"></a><a name="ia64-*-linux"></a>
    546  1.17    mrg <h3 class="heading">ia64-*-linux</h3>
    547   1.1    mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    548   1.1    mrg running GNU/Linux.
    549  1.10    mrg </p>
    550  1.10    mrg <p>If you are using the installed system libunwind library with
    551  1.10    mrg <samp>--with-system-libunwind</samp>, then you must use libunwind 0.98 or
    552   1.1    mrg later.
    553  1.10    mrg </p>
    554  1.10    mrg <hr />
    555  1.17    mrg <a name="ia64-x-hpux"></a><a name="ia64-*-hpux*"></a>
    556  1.17    mrg <h3 class="heading">ia64-*-hpux*</h3>
    557   1.1    mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    558   1.1    mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    559  1.10    mrg the option <samp>--with-gnu-as</samp> may be necessary.
    560  1.10    mrg </p>
    561  1.10    mrg <hr />
    562  1.10    mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    563  1.17    mrg <a name="x-ibm-aix"></a><a name="g_t*-ibm-aix*"></a>
    564  1.17    mrg <h3 class="heading">*-ibm-aix*</h3>
    565  1.10    mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4.
    566   1.1    mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    567  1.10    mrg </p>
    568  1.10    mrg <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    569   1.1    mrg process resource limits (ulimit).  Hard limits are configured in the
    570  1.10    mrg <samp>/etc/security/limits</samp> system configuration file.
    571  1.10    mrg </p>
    572  1.10    mrg <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    573   1.7    mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    574   1.7    mrg G++ can bootstrap recent releases of GCC.
    575  1.10    mrg </p>
    576  1.10    mrg <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    577   1.1    mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    578   1.1    mrg requires a larger data segment, which can be enabled through the
    579   1.1    mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    580  1.10    mrg </p>
    581  1.17    mrg <div class="smallexample">
    582  1.17    mrg <pre class="smallexample">% LDR_CNTRL=MAXDATA=0x50000000
    583  1.10    mrg % export LDR_CNTRL
    584  1.10    mrg </pre></div>
    585   1.1    mrg 
    586  1.10    mrg <p>One can start with a pre-compiled version of GCC to build from
    587  1.10    mrg sources.  One may delete GCC&rsquo;s &ldquo;fixed&rdquo; header files when starting
    588   1.1    mrg with a version of GCC built for an earlier release of AIX.
    589  1.10    mrg </p>
    590  1.10    mrg <p>To speed up the configuration phases of bootstrapping and installing GCC,
    591  1.10    mrg one may use GNU Bash instead of AIX <code>/bin/sh</code>, e.g.,
    592  1.10    mrg </p>
    593  1.17    mrg <div class="smallexample">
    594  1.17    mrg <pre class="smallexample">% CONFIG_SHELL=/opt/freeware/bin/bash
    595  1.10    mrg % export CONFIG_SHELL
    596  1.10    mrg </pre></div>
    597   1.1    mrg 
    598  1.10    mrg <p>and then proceed as described in <a href="build.html">the build
    599  1.10    mrg instructions</a>, where we strongly recommend specifying an absolute path
    600   1.1    mrg to invoke <var>srcdir</var>/configure.
    601  1.10    mrg </p>
    602  1.10    mrg <p>Because GCC on AIX is built as a 32-bit executable by default,
    603   1.1    mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    604   1.1    mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    605   1.1    mrg as static archive libraries works better than shared libraries.
    606  1.10    mrg </p>
    607  1.10    mrg <p>Errors involving <code>alloca</code> when building GCC generally are due
    608   1.1    mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    609   1.1    mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    610  1.10    mrg the build, the native AIX compiler <strong>must</strong> be invoked as <code>cc</code>
    611  1.10    mrg (not <code>xlc</code>).  Once <code>configure</code> has been informed of
    612  1.10    mrg <code>xlc</code>, one needs to use &lsquo;<samp>make distclean</samp>&rsquo; to remove the
    613  1.10    mrg configure cache files and ensure that <code>CC</code> environment variable
    614  1.10    mrg does not provide a definition that will confuse <code>configure</code>.
    615   1.1    mrg If this error occurs during stage2 or later, then the problem most likely
    616   1.1    mrg is the version of Make (see above).
    617  1.10    mrg </p>
    618  1.10    mrg <p>The native <code>as</code> and <code>ld</code> are recommended for
    619   1.3  skrll bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    620   1.3  skrll Binutils version 2.20 is the minimum level that supports bootstrap on
    621  1.10    mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6&nbsp;or
    622   1.3  skrll AIX 7.  The native AIX tools do interoperate with GCC.
    623  1.10    mrg </p>
    624  1.10    mrg <p>AIX 7.1 added partial support for DWARF debugging, but full support
    625   1.7    mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    626   1.7    mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    627   1.7    mrg of libm.a missing important symbols; a fix for IV77796 will be
    628   1.7    mrg included in SP6.
    629  1.10    mrg </p>
    630  1.10    mrg <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    631   1.3  skrll assembler change that sometimes produces corrupt assembly files
    632   1.3  skrll causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    633   1.3  skrll can cause compilation failures with existing GCC installations.  An
    634   1.3  skrll AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    635   1.3  skrll IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    636   1.3  skrll AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    637   1.3  skrll AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    638  1.10    mrg </p>
    639  1.10    mrg <p>Building <samp>libstdc++.a</samp> requires a fix for an AIX Assembler bug
    640   1.1    mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    641   1.1    mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    642   1.1    mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    643  1.10    mrg </p>
    644  1.17    mrg <a name="TransferAixShobj"></a><p>&lsquo;<samp>libstdc++</samp>&rsquo; in GCC 3.4 increments the major version number of the
    645  1.10    mrg shared object and GCC installation places the <samp>libstdc++.a</samp>
    646   1.1    mrg shared library in a common location which will overwrite the and GCC
    647   1.1    mrg 3.3 version of the shared library.  Applications either need to be
    648   1.1    mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    649  1.10    mrg versions of the &lsquo;<samp>libstdc++</samp>&rsquo; shared object needs to be available
    650  1.10    mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp>libstdc++.so.4</samp>&rsquo;, if
    651  1.10    mrg present, and GCC 3.3 &lsquo;<samp>libstdc++.so.5</samp>&rsquo; shared objects can be
    652   1.1    mrg installed for runtime dynamic loading using the following steps to set
    653  1.10    mrg the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag in the shared object for <em>each</em>
    654  1.10    mrg multilib <samp>libstdc++.a</samp> installed:
    655  1.10    mrg </p>
    656  1.10    mrg <p>Extract the shared objects from the currently installed
    657  1.10    mrg <samp>libstdc++.a</samp> archive:
    658  1.17    mrg </p><div class="smallexample">
    659  1.17    mrg <pre class="smallexample">% ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    660  1.10    mrg </pre></div>
    661   1.1    mrg 
    662  1.10    mrg <p>Enable the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag so that the shared object will be
    663   1.1    mrg available for runtime dynamic loading, but not linking:
    664  1.17    mrg </p><div class="smallexample">
    665  1.17    mrg <pre class="smallexample">% strip -e libstdc++.so.4 libstdc++.so.5
    666  1.10    mrg </pre></div>
    667  1.10    mrg 
    668  1.10    mrg <p>Archive the runtime-only shared object in the GCC 3.4
    669  1.10    mrg <samp>libstdc++.a</samp> archive:
    670  1.17    mrg </p><div class="smallexample">
    671  1.17    mrg <pre class="smallexample">% ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    672  1.10    mrg </pre></div>
    673  1.10    mrg 
    674  1.10    mrg <p>Eventually, the
    675  1.10    mrg <a href="./configure.html#WithAixSoname"><samp>--with-aix-soname=svr4</samp></a>
    676   1.5    mrg configure option may drop the need for this procedure for libraries that
    677   1.5    mrg support it.
    678  1.10    mrg </p>
    679  1.10    mrg <p>Linking executables and shared libraries may produce warnings of
    680   1.1    mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    681   1.1    mrg have included multiple symbol definitions for certain global variable
    682   1.1    mrg and function declarations in the original program.  The warnings should
    683   1.1    mrg not prevent the linker from producing a correct library or runnable
    684   1.1    mrg executable.
    685  1.10    mrg </p>
    686  1.10    mrg <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    687   1.1    mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    688  1.10    mrg to parse archive libraries did not handle the new format correctly.
    689   1.1    mrg These routines are used by GCC and result in error messages during
    690   1.1    mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    691  1.10    mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp>-g</samp>
    692   1.1    mrg option of the archive command may be used to create archives of 32-bit
    693   1.1    mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    694   1.1    mrg routines is shipped with AIX 4.3.2 and above.
    695  1.10    mrg </p>
    696  1.10    mrg <p>Some versions of the AIX binder (linker) can fail with a relocation
    697  1.10    mrg overflow severe error when the <samp>-bbigtoc</samp> option is used to link
    698   1.1    mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    699   1.1    mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    700   1.1    mrg available from IBM Customer Support and from its
    701  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    702   1.1    mrg website as PTF U455193.
    703  1.10    mrg </p>
    704  1.10    mrg <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    705   1.1    mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    706   1.1    mrg APAR IX87327 is available from IBM Customer Support and from its
    707  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    708   1.1    mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    709  1.10    mrg </p>
    710  1.10    mrg <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    711   1.1    mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    712   1.1    mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    713  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    714   1.1    mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    715  1.10    mrg </p>
    716  1.10    mrg <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    717   1.1    mrg use NLS to support locale-specific representations of various data
    718  1.10    mrg formats including floating-point numbers (e.g., &lsquo;<samp>.</samp>&rsquo;  vs &lsquo;<samp>,</samp>&rsquo; for
    719   1.1    mrg separating decimal fractions).  There have been problems reported where
    720   1.1    mrg GCC does not produce the same floating-point formats that the assembler
    721  1.10    mrg expects.  If one encounters this problem, set the <code>LANG</code>
    722  1.10    mrg environment variable to &lsquo;<samp>C</samp>&rsquo; or &lsquo;<samp>En_US</samp>&rsquo;.
    723  1.10    mrg </p>
    724  1.10    mrg <p>A default can be specified with the <samp>-mcpu=<var>cpu_type</var></samp>
    725  1.10    mrg switch and using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    726  1.10    mrg </p>
    727  1.10    mrg <hr />
    728  1.17    mrg <a name="iq2000-x-elf"></a><a name="iq2000-*-elf"></a>
    729  1.17    mrg <h3 class="heading">iq2000-*-elf</h3>
    730   1.1    mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    731   1.1    mrg applications.  There are no standard Unix configurations.
    732  1.10    mrg </p>
    733  1.10    mrg <hr />
    734  1.17    mrg <a name="lm32-x-elf"></a><a name="lm32-*-elf"></a>
    735  1.17    mrg <h3 class="heading">lm32-*-elf</h3>
    736  1.10    mrg <p>Lattice Mico32 processor.
    737   1.1    mrg This configuration is intended for embedded systems.
    738  1.10    mrg </p>
    739  1.10    mrg <hr />
    740  1.17    mrg <a name="lm32-x-uclinux"></a><a name="lm32-*-uclinux"></a>
    741  1.17    mrg <h3 class="heading">lm32-*-uclinux</h3>
    742  1.10    mrg <p>Lattice Mico32 processor.
    743   1.1    mrg This configuration is intended for embedded systems running uClinux.
    744  1.10    mrg </p>
    745  1.10    mrg <hr />
    746  1.17    mrg <a name="loongarch"></a><a name="LoongArch"></a>
    747  1.17    mrg <h3 class="heading">LoongArch</h3>
    748  1.15    mrg <p>LoongArch processor.
    749  1.15    mrg The following LoongArch targets are available:
    750  1.15    mrg </p><dl compact="compact">
    751  1.17    mrg <dt><code>loongarch64-linux-gnu*</code></dt>
    752  1.15    mrg <dd><p>LoongArch processor running GNU/Linux.  This target triplet may be coupled
    753  1.15    mrg with a small set of possible suffixes to identify their default ABI type:
    754  1.15    mrg </p><dl compact="compact">
    755  1.17    mrg <dt><code>f64</code></dt>
    756  1.15    mrg <dd><p>Uses <code>lp64d/base</code> ABI by default.
    757  1.15    mrg </p></dd>
    758  1.17    mrg <dt><code>f32</code></dt>
    759  1.15    mrg <dd><p>Uses <code>lp64f/base</code> ABI by default.
    760  1.15    mrg </p></dd>
    761  1.17    mrg <dt><code>sf</code></dt>
    762  1.15    mrg <dd><p>Uses <code>lp64s/base</code> ABI by default.
    763  1.15    mrg </p></dd>
    764  1.15    mrg </dl>
    765  1.15    mrg 
    766  1.15    mrg </dd>
    767  1.17    mrg <dt><code>loongarch64-linux-gnu</code></dt>
    768  1.18    mrg <dd><p>Same as <code>loongarch64-linux-gnuf64</code> for legacy support.
    769  1.15    mrg </p></dd>
    770  1.15    mrg </dl>
    771  1.15    mrg 
    772  1.15    mrg <p>More information about LoongArch can be found at
    773  1.15    mrg <a href="https://github.com/loongson/LoongArch-Documentation">https://github.com/loongson/LoongArch-Documentation</a>.
    774  1.15    mrg </p>
    775  1.15    mrg <hr />
    776  1.17    mrg <a name="m32c-x-elf"></a><a name="m32c-*-elf"></a>
    777  1.17    mrg <h3 class="heading">m32c-*-elf</h3>
    778  1.10    mrg <p>Renesas M32C processor.
    779   1.1    mrg This configuration is intended for embedded systems.
    780  1.10    mrg </p>
    781  1.10    mrg <hr />
    782  1.17    mrg <a name="m32r-x-elf"></a><a name="m32r-*-elf"></a>
    783  1.17    mrg <h3 class="heading">m32r-*-elf</h3>
    784  1.10    mrg <p>Renesas M32R processor.
    785   1.1    mrg This configuration is intended for embedded systems.
    786  1.10    mrg </p>
    787  1.10    mrg <hr />
    788  1.17    mrg <a name="m68k-x-x"></a><a name="m68k-*-*"></a>
    789  1.17    mrg <h3 class="heading">m68k-*-*</h3>
    790   1.1    mrg <p>By default,
    791  1.10    mrg &lsquo;<samp>m68k-*-elf*</samp>&rsquo;, &lsquo;<samp>m68k-*-rtems</samp>&rsquo;,  &lsquo;<samp>m68k-*-uclinux</samp>&rsquo; and
    792  1.10    mrg &lsquo;<samp>m68k-*-linux</samp>&rsquo;
    793   1.1    mrg build libraries for both M680x0 and ColdFire processors.  If you only
    794   1.1    mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    795  1.10    mrg <samp>--with-arch=m68k</samp> to <code>configure</code>.  Alternatively, you
    796  1.10    mrg can omit the M680x0 libraries by passing <samp>--with-arch=cf</samp> to
    797  1.10    mrg <code>configure</code>.  These targets default to 5206 or 5475 code as
    798   1.1    mrg appropriate for the target system when
    799  1.10    mrg configured with <samp>--with-arch=cf</samp> and 68020 code otherwise.
    800  1.10    mrg </p>
    801  1.10    mrg <p>The &lsquo;<samp>m68k-*-netbsd</samp>&rsquo; and
    802  1.10    mrg &lsquo;<samp>m68k-*-openbsd</samp>&rsquo; targets also support the <samp>--with-arch</samp>
    803   1.1    mrg option.  They will generate ColdFire CFV4e code when configured with
    804  1.10    mrg <samp>--with-arch=cf</samp> and 68020 code otherwise.
    805  1.10    mrg </p>
    806  1.10    mrg <p>You can override the default processors listed above by configuring
    807  1.10    mrg with <samp>--with-cpu=<var>target</var></samp>.  This <var>target</var> can either
    808  1.10    mrg be a <samp>-mcpu</samp> argument or one of the following values:
    809  1.10    mrg &lsquo;<samp>m68000</samp>&rsquo;, &lsquo;<samp>m68010</samp>&rsquo;, &lsquo;<samp>m68020</samp>&rsquo;, &lsquo;<samp>m68030</samp>&rsquo;,
    810  1.10    mrg &lsquo;<samp>m68040</samp>&rsquo;, &lsquo;<samp>m68060</samp>&rsquo;, &lsquo;<samp>m68020-40</samp>&rsquo; and &lsquo;<samp>m68020-60</samp>&rsquo;.
    811  1.10    mrg </p>
    812  1.10    mrg <p>GCC requires at least binutils version 2.17 on these targets.
    813  1.10    mrg </p>
    814  1.10    mrg <hr />
    815  1.17    mrg <a name="m68k-x-uclinux"></a><a name="m68k-*-uclinux"></a>
    816  1.17    mrg <h3 class="heading">m68k-*-uclinux</h3>
    817   1.1    mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    818  1.10    mrg &lsquo;<samp>m68k-linux-gnu</samp>&rsquo; ABI rather than the &lsquo;<samp>m68k-elf</samp>&rsquo; ABI.
    819   1.1    mrg It also added improved support for C++ and flat shared libraries,
    820   1.3  skrll both of which were ABI changes.
    821  1.10    mrg </p>
    822  1.10    mrg <hr />
    823  1.17    mrg <a name="microblaze-x-elf"></a><a name="microblaze-*-elf"></a>
    824  1.17    mrg <h3 class="heading">microblaze-*-elf</h3>
    825  1.10    mrg <p>Xilinx MicroBlaze processor.
    826   1.1    mrg This configuration is intended for embedded systems.
    827  1.10    mrg </p>
    828  1.10    mrg <hr />
    829  1.17    mrg <a name="mips-x-x"></a><a name="mips-*-*"></a>
    830  1.17    mrg <h3 class="heading">mips-*-*</h3>
    831   1.1    mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    832  1.10    mrg sections for all it&rsquo;s [sic] sectons [sic]&rdquo;, don&rsquo;t worry about it.  This
    833   1.1    mrg happens whenever you use GAS with the MIPS linker, but there is not
    834   1.1    mrg really anything wrong, and it is okay to use the output file.  You can
    835   1.1    mrg stop such warnings by installing the GNU linker.
    836  1.10    mrg </p>
    837  1.10    mrg <p>It would be nice to extend GAS to produce the gp tables, but they are
    838   1.1    mrg optional, and there should not be a warning about their absence.
    839  1.10    mrg </p>
    840  1.10    mrg <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    841   1.1    mrg and later.  A patch went in just after the GCC 3.3 release to
    842  1.10    mrg make &lsquo;<samp>mips*-*-*</samp>&rsquo; use the generic implementation instead.  You can also
    843  1.10    mrg configure for &lsquo;<samp>mipsel-elf</samp>&rsquo; as a workaround.  The
    844  1.10    mrg &lsquo;<samp>mips*-*-linux*</samp>&rsquo; target continues to use the MIPS II routines.  More
    845   1.1    mrg work on this is expected in future releases.
    846  1.10    mrg </p>
    847   1.1    mrg 
    848  1.10    mrg <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    849  1.10    mrg later systems and others that support the &lsquo;<samp>ll</samp>&rsquo;, &lsquo;<samp>sc</samp>&rsquo; and
    850  1.10    mrg &lsquo;<samp>sync</samp>&rsquo; instructions.  This can be overridden by passing
    851  1.10    mrg <samp>--with-llsc</samp> or <samp>--without-llsc</samp> when configuring GCC.
    852   1.1    mrg Since the Linux kernel emulates these instructions if they are
    853  1.10    mrg missing, the default for &lsquo;<samp>mips*-*-linux*</samp>&rsquo; targets is
    854  1.10    mrg <samp>--with-llsc</samp>.  The <samp>--with-llsc</samp> and
    855  1.10    mrg <samp>--without-llsc</samp> configure options may be overridden at compile
    856  1.10    mrg time by passing the <samp>-mllsc</samp> or <samp>-mno-llsc</samp> options to
    857   1.1    mrg the compiler.
    858  1.10    mrg </p>
    859  1.10    mrg <p>MIPS systems check for division by zero (unless
    860  1.10    mrg <samp>-mno-check-zero-division</samp> is passed to the compiler) by
    861   1.1    mrg generating either a conditional trap or a break instruction.  Using
    862   1.1    mrg trap results in smaller code, but is only supported on MIPS II and
    863   1.1    mrg later.  Also, some versions of the Linux kernel have a bug that
    864   1.1    mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    865  1.10    mrg the use of break, use the <samp>--with-divide=breaks</samp>
    866  1.10    mrg <code>configure</code> option when configuring GCC.  The default is to
    867   1.1    mrg use traps on systems that support them.
    868  1.10    mrg </p>
    869  1.10    mrg <hr />
    870  1.17    mrg <a name="moxie-x-elf"></a><a name="moxie-*-elf"></a>
    871  1.17    mrg <h3 class="heading">moxie-*-elf</h3>
    872   1.3  skrll <p>The moxie processor.
    873  1.10    mrg </p>
    874  1.10    mrg <hr />
    875  1.17    mrg <a name="msp430-x-elf"></a><a name="msp430-*-elf*"></a>
    876  1.17    mrg <h3 class="heading">msp430-*-elf*</h3>
    877  1.10    mrg <p>TI MSP430 processor.
    878   1.5    mrg This configuration is intended for embedded systems.
    879  1.10    mrg </p>
    880  1.12    mrg <p>&lsquo;<samp>msp430-*-elf</samp>&rsquo; is the standard configuration with most GCC
    881  1.12    mrg features enabled by default.
    882  1.12    mrg </p>
    883  1.12    mrg <p>&lsquo;<samp>msp430-*-elfbare</samp>&rsquo; is tuned for a bare-metal environment, and disables
    884  1.12    mrg features related to shared libraries and other functionality not used for
    885  1.12    mrg this device.  This reduces code and data usage of the GCC libraries, resulting
    886  1.12    mrg in a minimal run-time environment by default.
    887  1.12    mrg </p>
    888  1.12    mrg <p>Features disabled by default include:
    889  1.12    mrg </p><ul>
    890  1.12    mrg <li> transactional memory
    891  1.12    mrg </li><li> __cxa_atexit
    892  1.12    mrg </li></ul>
    893  1.12    mrg 
    894  1.10    mrg <hr />
    895  1.17    mrg <a name="nds32le-x-elf"></a><a name="nds32le-*-elf"></a>
    896  1.17    mrg <h3 class="heading">nds32le-*-elf</h3>
    897   1.5    mrg <p>Andes NDS32 target in little endian mode.
    898  1.10    mrg </p>
    899  1.10    mrg <hr />
    900  1.17    mrg <a name="nds32be-x-elf"></a><a name="nds32be-*-elf"></a>
    901  1.17    mrg <h3 class="heading">nds32be-*-elf</h3>
    902   1.5    mrg <p>Andes NDS32 target in big endian mode.
    903  1.10    mrg </p>
    904  1.10    mrg <hr />
    905  1.17    mrg <a name="nvptx-x-none"></a><a name="nvptx-*-none"></a>
    906  1.17    mrg <h3 class="heading">nvptx-*-none</h3>
    907   1.5    mrg <p>Nvidia PTX target.
    908  1.10    mrg </p>
    909  1.10    mrg <p>Instead of GNU binutils, you will need to install
    910  1.18    mrg <a href="https://github.com/SourceryTools/nvptx-tools">nvptx-tools</a>.
    911   1.5    mrg Tell GCC where to find it:
    912  1.10    mrg <samp>--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</samp>.
    913  1.10    mrg </p>
    914  1.18    mrg <p>You will need newlib 4.3.0 or later.  It can be
    915  1.10    mrg automatically built together with GCC.  For this, add a symbolic link
    916  1.10    mrg to nvptx-newlib&rsquo;s <samp>newlib</samp> directory to the directory containing
    917  1.10    mrg the GCC sources.
    918  1.10    mrg </p>
    919  1.10    mrg <p>Use the <samp>--disable-sjlj-exceptions</samp> and
    920  1.10    mrg <samp>--enable-newlib-io-long-long</samp> options when configuring.
    921  1.10    mrg </p>
    922  1.18    mrg <p>The <samp>--with-arch</samp> option may be specified to override the
    923  1.18    mrg default value for the <samp>-march</samp> option, and to also build
    924  1.18    mrg corresponding target libraries.
    925  1.18    mrg The default is <samp>--with-arch=sm_30</samp>.
    926  1.18    mrg </p>
    927  1.18    mrg <p>For example, if <samp>--with-arch=sm_70</samp> is specified,
    928  1.18    mrg <samp>-march=sm_30</samp> and <samp>-march=sm_70</samp> target libraries are
    929  1.18    mrg built, and code generation defaults to <samp>-march=sm_70</samp>.
    930  1.18    mrg </p>
    931  1.10    mrg <hr />
    932  1.17    mrg <a name="or1k-x-elf"></a><a name="or1k-*-elf"></a>
    933  1.17    mrg <h3 class="heading">or1k-*-elf</h3>
    934  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    935  1.11    mrg This configuration is intended for embedded systems.
    936  1.11    mrg </p>
    937  1.11    mrg <hr />
    938  1.17    mrg <a name="or1k-x-linux"></a><a name="or1k-*-linux"></a>
    939  1.17    mrg <h3 class="heading">or1k-*-linux</h3>
    940  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    941  1.11    mrg </p>
    942  1.11    mrg <hr />
    943  1.17    mrg <a name="powerpc-x-x"></a><a name="powerpc-*-*"></a>
    944  1.17    mrg <h3 class="heading">powerpc-*-*</h3>
    945  1.10    mrg <p>You can specify a default version for the <samp>-mcpu=<var>cpu_type</var></samp>
    946  1.10    mrg switch by using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    947  1.10    mrg </p>
    948  1.12    mrg <p>You will need GNU binutils 2.20 or newer.
    949  1.10    mrg </p>
    950  1.10    mrg <hr />
    951  1.17    mrg <a name="powerpc-x-darwin"></a><a name="powerpc-*-darwin*"></a>
    952  1.17    mrg <h3 class="heading">powerpc-*-darwin*</h3>
    953   1.1    mrg <p>PowerPC running Darwin (Mac OS X kernel).
    954  1.10    mrg </p>
    955  1.10    mrg <p>Pre-installed versions of Mac OS X may not include any developer tools,
    956   1.1    mrg meaning that you will not be able to build GCC from source.  Tool
    957   1.1    mrg binaries are available at
    958   1.9    mrg <a href="https://opensource.apple.com">https://opensource.apple.com</a>.
    959  1.10    mrg </p>
    960  1.10    mrg <p>This version of GCC requires at least cctools-590.36.  The
    961   1.1    mrg cctools-590.36 package referenced from
    962  1.15    mrg <a 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
    963   1.1    mrg on systems older than 10.3.9 (aka darwin7.9.0).
    964  1.10    mrg </p>
    965  1.10    mrg <hr />
    966  1.17    mrg <a name="powerpc-x-elf"></a><a name="powerpc-*-elf"></a>
    967  1.17    mrg <h3 class="heading">powerpc-*-elf</h3>
    968   1.1    mrg <p>PowerPC system in big endian mode, running System V.4.
    969  1.10    mrg </p>
    970  1.10    mrg <hr />
    971  1.17    mrg <a name="powerpc-x-linux-gnu"></a><a name="powerpc*-*-linux-gnu*"></a>
    972  1.17    mrg <h3 class="heading">powerpc*-*-linux-gnu*</h3>
    973   1.1    mrg <p>PowerPC system in big endian mode running Linux.
    974  1.10    mrg </p>
    975  1.10    mrg <hr />
    976  1.17    mrg <a name="powerpc-x-netbsd"></a><a name="powerpc-*-netbsd*"></a>
    977  1.17    mrg <h3 class="heading">powerpc-*-netbsd*</h3>
    978   1.1    mrg <p>PowerPC system in big endian mode running NetBSD.
    979  1.10    mrg </p>
    980  1.10    mrg <hr />
    981  1.17    mrg <a name="powerpc-x-eabisim"></a><a name="powerpc-*-eabisim"></a>
    982  1.17    mrg <h3 class="heading">powerpc-*-eabisim</h3>
    983   1.1    mrg <p>Embedded PowerPC system in big endian mode for use in running under the
    984   1.1    mrg PSIM simulator.
    985  1.10    mrg </p>
    986  1.10    mrg <hr />
    987  1.17    mrg <a name="powerpc-x-eabi"></a><a name="powerpc-*-eabi"></a>
    988  1.17    mrg <h3 class="heading">powerpc-*-eabi</h3>
    989   1.1    mrg <p>Embedded PowerPC system in big endian mode.
    990  1.10    mrg </p>
    991  1.10    mrg <hr />
    992  1.17    mrg <a name="powerpcle-x-elf"></a><a name="powerpcle-*-elf"></a>
    993  1.17    mrg <h3 class="heading">powerpcle-*-elf</h3>
    994   1.1    mrg <p>PowerPC system in little endian mode, running System V.4.
    995  1.10    mrg </p>
    996  1.10    mrg <hr />
    997  1.17    mrg <a name="powerpcle-x-eabisim"></a><a name="powerpcle-*-eabisim"></a>
    998  1.17    mrg <h3 class="heading">powerpcle-*-eabisim</h3>
    999   1.1    mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1000   1.1    mrg the PSIM simulator.
   1001  1.10    mrg </p>
   1002  1.10    mrg <hr />
   1003  1.17    mrg <a name="powerpcle-x-eabi"></a><a name="powerpcle-*-eabi"></a>
   1004  1.17    mrg <h3 class="heading">powerpcle-*-eabi</h3>
   1005   1.1    mrg <p>Embedded PowerPC system in little endian mode.
   1006  1.10    mrg </p>
   1007  1.10    mrg <hr />
   1008  1.17    mrg <a name="rl78-x-elf"></a><a name="rl78-*-elf"></a>
   1009  1.17    mrg <h3 class="heading">rl78-*-elf</h3>
   1010  1.10    mrg <p>The Renesas RL78 processor.
   1011  1.10    mrg This configuration is intended for embedded systems.
   1012  1.10    mrg </p>
   1013  1.10    mrg <hr />
   1014  1.17    mrg <a name="riscv32-x-elf"></a><a name="riscv32-*-elf"></a>
   1015  1.17    mrg <h3 class="heading">riscv32-*-elf</h3>
   1016  1.10    mrg <p>The RISC-V RV32 instruction set.
   1017   1.3  skrll This configuration is intended for embedded systems.
   1018  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1019  1.10    mrg </p>
   1020  1.10    mrg <hr />
   1021  1.17    mrg <a name="riscv32-x-linux"></a><a name="riscv32-*-linux"></a>
   1022  1.17    mrg <h3 class="heading">riscv32-*-linux</h3>
   1023  1.10    mrg <p>The RISC-V RV32 instruction set running GNU/Linux.
   1024  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1025  1.10    mrg </p>
   1026  1.10    mrg <hr />
   1027  1.17    mrg <a name="riscv64-x-elf"></a><a name="riscv64-*-elf"></a>
   1028  1.17    mrg <h3 class="heading">riscv64-*-elf</h3>
   1029  1.10    mrg <p>The RISC-V RV64 instruction set.
   1030  1.10    mrg This configuration is intended for embedded systems.
   1031  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1032  1.10    mrg </p>
   1033  1.10    mrg <hr />
   1034  1.17    mrg <a name="riscv64-x-linux"></a><a name="riscv64-*-linux"></a>
   1035  1.17    mrg <h3 class="heading">riscv64-*-linux</h3>
   1036  1.10    mrg <p>The RISC-V RV64 instruction set running GNU/Linux.
   1037  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1038  1.10    mrg </p>
   1039  1.10    mrg <hr />
   1040  1.17    mrg <a name="rx-x-elf"></a><a name="rx-*-elf"></a>
   1041  1.17    mrg <h3 class="heading">rx-*-elf</h3>
   1042   1.9    mrg <p>The Renesas RX processor.
   1043  1.10    mrg </p>
   1044  1.10    mrg <hr />
   1045  1.17    mrg <a name="s390-x-linux"></a><a name="s390-*-linux*"></a>
   1046  1.17    mrg <h3 class="heading">s390-*-linux*</h3>
   1047   1.1    mrg <p>S/390 system running GNU/Linux for S/390.
   1048  1.10    mrg </p>
   1049  1.10    mrg <hr />
   1050  1.17    mrg <a name="s390x-x-linux"></a><a name="s390x-*-linux*"></a>
   1051  1.17    mrg <h3 class="heading">s390x-*-linux*</h3>
   1052   1.1    mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1053  1.10    mrg </p>
   1054  1.10    mrg <hr />
   1055  1.17    mrg <a name="s390x-ibm-tpf"></a><a name="s390x-ibm-tpf*"></a>
   1056  1.17    mrg <h3 class="heading">s390x-ibm-tpf*</h3>
   1057   1.1    mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1058   1.1    mrg supported as cross-compilation target only.
   1059  1.10    mrg </p>
   1060  1.10    mrg <hr />
   1061  1.17    mrg <a name="x-x-solaris2"></a><a name="g_t*-*-solaris2*"></a>
   1062  1.17    mrg <h3 class="heading">*-*-solaris2*</h3>
   1063  1.18    mrg <p>Support for Solaris 11.3 and earlier has been obsoleted in GCC 13, but
   1064  1.18    mrg can still be enabled by configuring with <samp>--enable-obsolete</samp>.
   1065  1.18    mrg Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
   1066  1.12    mrg 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
   1067  1.12    mrg GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
   1068  1.12    mrg </p>
   1069  1.12    mrg <p>Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1070  1.18    mrg <code>/usr/gcc/4.5/bin/gcc</code> or similar.  Solaris 11.4
   1071  1.18    mrg provides one or more of GCC 5, 7, 9, 10, 11, and 12.
   1072  1.18    mrg </p>
   1073  1.18    mrg <p>You need to install the <code>system/header</code>, <code>system/linker</code>, and
   1074  1.18    mrg <code>developer/assembler</code> packages.
   1075  1.10    mrg </p>
   1076  1.18    mrg <p>Trying to use the compatibility tools in <samp>/usr/ucb</samp>, from the
   1077  1.18    mrg <code>compatibility/ucb</code> package, to install GCC has been observed to
   1078  1.18    mrg cause trouble.  The fix is to remove <samp>/usr/ucb</samp> from your
   1079  1.18    mrg <code>PATH</code>.
   1080  1.18    mrg </p>
   1081  1.18    mrg <p>The build process works more smoothly with the legacy Solaris tools so,
   1082  1.18    mrg if you have <samp>/usr/xpg4/bin</samp> in your <code>PATH</code>, we recommend that
   1083  1.18    mrg you place <samp>/usr/bin</samp> before <samp>/usr/xpg4/bin</samp> for the duration
   1084  1.18    mrg of the build.
   1085  1.10    mrg </p>
   1086  1.10    mrg <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1087  1.18    mrg conjunction with the Solaris linker.
   1088  1.18    mrg </p>
   1089  1.18    mrg <p>The GNU <code>as</code> versions included in Solaris 11.3, from GNU
   1090  1.18    mrg binutils 2.23.1 or newer (in <samp>/usr/bin/gas</samp> and
   1091  1.18    mrg <samp>/usr/gnu/bin/as</samp>), are known to work.  The version from GNU
   1092  1.18    mrg binutils 2.40 is known to work as well.  Recent versions of the Solaris
   1093  1.18    mrg assembler in <samp>/usr/bin/as</samp> work almost as well, though.  To use GNU
   1094  1.18    mrg <code>as</code>, configure with the options <samp>--with-gnu-as
   1095  1.18    mrg --with-as=/usr/gnu/bin/as</samp>.
   1096  1.18    mrg </p>
   1097  1.18    mrg <p>For linking, the Solaris linker is preferred.  If you want to use the
   1098  1.18    mrg GNU linker instead, the version in Solaris 11.3, from GNU binutils
   1099  1.18    mrg 2.23.1 or newer (in <samp>/usr/gnu/bin/ld</samp> and <samp>/usr/bin/gld</samp>),
   1100  1.18    mrg works, as does the version from GNU binutils 2.40.  However, it
   1101  1.18    mrg generally lacks platform specific features, so better stay with Solaris
   1102  1.18    mrg <code>ld</code>.  To use the LTO linker plugin
   1103  1.18    mrg (<samp>-fuse-linker-plugin</samp>) with GNU <code>ld</code>, GNU binutils
   1104  1.18    mrg <em>must</em> be configured with <samp>--enable-largefile</samp>.  To use
   1105  1.18    mrg Solaris <code>ld</code>, we recommend to configure with
   1106  1.18    mrg <samp>--without-gnu-ld --with-ld=/usr/bin/ld</samp> to guarantee the
   1107  1.18    mrg right linker is found irrespective of the user&rsquo;s <code>PATH</code>.
   1108  1.18    mrg </p>
   1109  1.18    mrg <p>Note that your mileage may vary if you use a combination of the GNU
   1110  1.18    mrg tools and the Solaris tools: while the combination GNU <code>as</code> and
   1111  1.18    mrg Solaris <code>ld</code> works well, the reverse combination Solaris
   1112  1.18    mrg <code>as</code> with GNU <code>ld</code> may fail to build or cause memory
   1113  1.18    mrg corruption at runtime in some cases for C++ programs.
   1114  1.18    mrg </p>
   1115  1.18    mrg <p>To enable symbol versioning in &lsquo;<samp>libstdc++</samp>&rsquo; and other runtime
   1116  1.18    mrg libraries with the Solaris linker, you need to have any version of GNU
   1117  1.18    mrg <code>c++filt</code>, which is part of GNU binutils.  Symbol versioning
   1118  1.18    mrg will be disabled if no appropriate version is found.  Solaris
   1119  1.18    mrg <code>c++filt</code> from the Solaris Studio compilers does <em>not</em>
   1120  1.18    mrg work.
   1121  1.18    mrg </p>
   1122  1.18    mrg <p>In order to build the GNU Ada compiler, GNAT, a working GNAT is needed.
   1123  1.18    mrg Since Solaris 11.4 SRU 39, GNAT 11 or 12 is bundled in the
   1124  1.18    mrg <code>developer/gcc/gcc-gnat</code> package.
   1125  1.10    mrg </p>
   1126  1.15    mrg <p>In order to build the GNU D compiler, GDC, a working &lsquo;<samp>libphobos</samp>&rsquo; is
   1127  1.15    mrg needed.  That library wasn&rsquo;t built by default in GCC 9&ndash;11 on SPARC, or
   1128  1.15    mrg on x86 when the Solaris assembler is used, but can be enabled by
   1129  1.15    mrg configuring with <samp>--enable-libphobos</samp>.  Also, GDC 9.4.0 is
   1130  1.15    mrg required on x86, while GDC 9.3.0 is known to work on SPARC.
   1131  1.15    mrg </p>
   1132  1.12    mrg <p>The versions of the GNU Multiple Precision Library (GMP), the MPFR
   1133  1.12    mrg library and the MPC library bundled with Solaris 11.3 and later are
   1134  1.12    mrg usually recent enough to match GCC&rsquo;s requirements.  There are two
   1135  1.12    mrg caveats:
   1136  1.10    mrg </p>
   1137  1.12    mrg <ul>
   1138  1.12    mrg <li> While the version of the GMP library in Solaris 11.3 works with GCC, you
   1139  1.12    mrg need to configure with <samp>--with-gmp-include=/usr/include/gmp</samp>.
   1140  1.12    mrg 
   1141  1.12    mrg </li><li> The version of the MPFR libary included in Solaris 11.3 is too old; you
   1142  1.12    mrg need to provide a more recent one.
   1143  1.15    mrg 
   1144  1.12    mrg </li></ul>
   1145  1.12    mrg 
   1146  1.10    mrg <hr />
   1147  1.17    mrg <a name="sparc-x-x"></a><a name="sparc*-*-*"></a>
   1148  1.17    mrg <h3 class="heading">sparc*-*-*</h3>
   1149   1.3  skrll <p>This section contains general configuration information for all
   1150   1.3  skrll SPARC-based platforms.  In addition to reading this section, please
   1151   1.3  skrll read all other sections that match your target.
   1152  1.10    mrg </p>
   1153  1.10    mrg <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1154   1.3  skrll library and the MPC library are known to be miscompiled by earlier
   1155   1.3  skrll versions of GCC on these platforms.  We therefore recommend the use
   1156   1.3  skrll of the exact versions of these libraries listed as minimal versions
   1157   1.3  skrll in <a href="prerequisites.html">the prerequisites</a>.
   1158  1.10    mrg </p>
   1159  1.10    mrg <hr />
   1160  1.17    mrg <a name="sparc-sun-solaris2"></a><a name="sparc-sun-solaris2*"></a>
   1161  1.17    mrg <h3 class="heading">sparc-sun-solaris2*</h3>
   1162   1.1    mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1163  1.12    mrg produced are smaller than the ones produced using Solaris native tools;
   1164   1.1    mrg this difference is quite significant for binaries containing debugging
   1165   1.1    mrg information.
   1166  1.10    mrg </p>
   1167  1.10    mrg <p>Starting with Solaris 7, the operating system is capable of executing
   1168   1.1    mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1169  1.10    mrg this; the <samp>-m64</samp> option enables 64-bit code generation.
   1170  1.10    mrg </p>
   1171  1.10    mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1172  1.18    mrg library or the MPC library on Solaris, the canonical target triplet must
   1173  1.18    mrg be specified as the <code>build</code> parameter on the <code>configure</code>
   1174  1.18    mrg line.  This target triplet can be obtained by invoking
   1175  1.18    mrg <code>./config.guess</code> in the toplevel source directory of GCC (and
   1176  1.18    mrg not that of GMP or MPFR or MPC).  For example:
   1177  1.10    mrg </p>
   1178  1.17    mrg <div class="smallexample">
   1179  1.18    mrg <pre class="smallexample">% <var>srcdir</var>/configure --build=sparc-sun-solaris2.11 --prefix=<var>dirname</var>
   1180  1.10    mrg </pre></div>
   1181  1.10    mrg 
   1182  1.10    mrg <hr />
   1183  1.17    mrg <a name="sparc-x-linux"></a><a name="sparc-*-linux*"></a>
   1184  1.17    mrg <h3 class="heading">sparc-*-linux*</h3>
   1185  1.10    mrg 
   1186  1.10    mrg <hr />
   1187  1.17    mrg <a name="sparc64-x-solaris2"></a><a name="sparc64-*-solaris2*"></a>
   1188  1.17    mrg <h3 class="heading">sparc64-*-solaris2*</h3>
   1189  1.18    mrg <p>This is a synonym for &lsquo;<samp>sparcv9-*-solaris2*</samp>&rsquo;.
   1190  1.18    mrg </p>
   1191  1.18    mrg <hr />
   1192  1.18    mrg <a name="sparcv9-x-solaris2"></a><a name="sparcv9-*-solaris2*"></a>
   1193  1.18    mrg <h3 class="heading">sparcv9-*-solaris2*</h3>
   1194  1.18    mrg 
   1195  1.12    mrg <p>When configuring a 64-bit-default GCC on Solaris/SPARC, you must use a
   1196  1.12    mrg build compiler that generates 64-bit code, either by default or by
   1197  1.18    mrg specifying &lsquo;<samp>CC='gcc -m64' CXX='g++ -m64' GDC='gdc -m64'</samp>&rsquo; to <code>configure</code>.
   1198  1.18    mrg Additionally, you <em>must</em> pass <samp>--build=sparcv9-sun-solaris2.11</samp>
   1199  1.18    mrg or <samp>--build=sparc64-sun-solaris2.11</samp> because <samp>config.guess</samp>
   1200  1.12    mrg misdetects this situation, which can cause build failures.
   1201  1.12    mrg </p>
   1202   1.3  skrll <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1203   1.3  skrll library or the MPC library, the canonical target triplet must be specified
   1204  1.18    mrg as the <code>build</code> parameter on the <code>configure</code> line.  For example:
   1205  1.10    mrg </p>
   1206  1.17    mrg <div class="smallexample">
   1207  1.18    mrg <pre class="smallexample">% <var>srcdir</var>/configure --build=sparcv9-sun-solaris2.11 --prefix=<var>dirname</var>
   1208  1.10    mrg </pre></div>
   1209  1.10    mrg 
   1210  1.10    mrg <hr />
   1211  1.17    mrg <a name="c6x-x-x"></a><a name="c6x-*-*"></a>
   1212  1.17    mrg <h3 class="heading">c6x-*-*</h3>
   1213   1.3  skrll <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1214  1.10    mrg </p>
   1215  1.10    mrg <hr />
   1216  1.17    mrg <a name="visium-x-elf"></a><a name="visium-*-elf"></a>
   1217  1.17    mrg <h3 class="heading">visium-*-elf</h3>
   1218  1.10    mrg <p>CDS VISIUMcore processor.
   1219   1.5    mrg This configuration is intended for embedded systems.
   1220  1.10    mrg </p>
   1221  1.10    mrg <hr />
   1222  1.17    mrg <a name="x-x-vxworks"></a><a name="g_t*-*-vxworks*"></a>
   1223  1.17    mrg <h3 class="heading">*-*-vxworks*</h3>
   1224   1.1    mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1225  1.10    mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC.
   1226  1.10    mrg We welcome patches for other architectures supported by VxWorks 5.5.
   1227   1.1    mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1228   1.1    mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1229   1.1    mrg not interested in supporting older, a.out or COFF-based, versions of
   1230   1.1    mrg VxWorks in GCC 3.
   1231  1.10    mrg </p>
   1232  1.10    mrg <p>VxWorks comes with an older version of GCC installed in
   1233  1.10    mrg <samp><var>$WIND_BASE</var>/host</samp>; we recommend you do not overwrite it.
   1234  1.10    mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>.
   1235  1.10    mrg Before running <code>configure</code>, create the directories <samp><var>prefix</var></samp>
   1236  1.10    mrg and <samp><var>prefix</var>/bin</samp>.  Link or copy the appropriate assembler,
   1237  1.10    mrg linker, etc. into <samp><var>prefix</var>/bin</samp>, and set your <var>PATH</var> to
   1238  1.10    mrg include that directory while running both <code>configure</code> and
   1239  1.10    mrg <code>make</code>.
   1240  1.10    mrg </p>
   1241  1.10    mrg <p>You must give <code>configure</code> the
   1242  1.10    mrg <samp>--with-headers=<var>$WIND_BASE</var>/target/h</samp> switch so that it can
   1243   1.1    mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1244  1.10    mrg target only, you must also specify <samp>--target=<var>target</var></samp>.
   1245  1.10    mrg <code>configure</code> will attempt to create the directory
   1246  1.10    mrg <samp><var>prefix</var>/<var>target</var>/sys-include</samp> and copy files into it;
   1247  1.10    mrg make sure the user running <code>configure</code> has sufficient privilege
   1248   1.1    mrg to do so.
   1249  1.10    mrg </p>
   1250  1.10    mrg <p>GCC&rsquo;s exception handling runtime requires a special &ldquo;configlette&rdquo;
   1251  1.10    mrg module, <samp>contrib/gthr_supp_vxw_5x.c</samp>.  Follow the instructions in
   1252   1.1    mrg that file to add the module to your kernel build.  (Future versions of
   1253   1.1    mrg VxWorks will incorporate this module.)
   1254  1.10    mrg </p>
   1255  1.10    mrg <hr />
   1256  1.17    mrg <a name="x86-64-x-x"></a><a name="x86_005f64-*-*_002c-amd64-*-*"></a>
   1257  1.17    mrg <h3 class="heading">x86_64-*-*, amd64-*-*</h3>
   1258   1.1    mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1259  1.10    mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD.
   1260   1.1    mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1261  1.10    mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp>-m32</samp> switch).
   1262  1.10    mrg </p>
   1263  1.10    mrg <hr />
   1264  1.17    mrg <a name="x86-64-x-solaris2"></a><a name="x86_005f64-*-solaris2*"></a>
   1265  1.17    mrg <h3 class="heading">x86_64-*-solaris2*</h3>
   1266   1.3  skrll <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1267  1.18    mrg processor (&lsquo;<samp>amd64-*-*</samp>&rsquo; is an alias for &lsquo;<samp>x86_64-*-*</samp>&rsquo;).
   1268  1.18    mrg Unlike other systems, without special options a
   1269   1.3  skrll bi-arch compiler is built which generates 32-bit code by default, but
   1270  1.10    mrg can generate 64-bit x86-64 code with the <samp>-m64</samp> switch.  Since
   1271   1.7    mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1272  1.10    mrg can generate 32-bit code with <samp>-m32</samp>.  To configure and build
   1273  1.10    mrg this way, you have to provide all support libraries like <samp>libgmp</samp>
   1274  1.12    mrg as 64-bit code, configure with <samp>--target=x86_64-pc-solaris2.11</samp>
   1275  1.10    mrg and &lsquo;<samp>CC=gcc -m64</samp>&rsquo;.
   1276  1.10    mrg </p>
   1277  1.10    mrg <hr />
   1278  1.17    mrg <a name="xtensa-x-elf"></a><a name="xtensa*-*-elf"></a>
   1279  1.17    mrg <h3 class="heading">xtensa*-*-elf</h3>
   1280   1.1    mrg <p>This target is intended for embedded Xtensa systems using the
   1281  1.10    mrg &lsquo;<samp>newlib</samp>&rsquo; C library.  It uses ELF but does not support shared
   1282   1.1    mrg objects.  Designed-defined instructions specified via the
   1283   1.1    mrg Tensilica Instruction Extension (TIE) language are only supported
   1284   1.1    mrg through inline assembly.
   1285  1.10    mrg </p>
   1286  1.10    mrg <p>The Xtensa configuration information must be specified prior to
   1287  1.10    mrg building GCC.  The <samp>include/xtensa-config.h</samp> header
   1288   1.1    mrg file contains the configuration information.  If you created your
   1289   1.1    mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1290   1.1    mrg downloaded files include a customized copy of this header file,
   1291   1.1    mrg which you can use to replace the default header file.
   1292  1.10    mrg </p>
   1293  1.10    mrg <hr />
   1294  1.17    mrg <a name="xtensa-x-linux"></a><a name="xtensa*-*-linux*"></a>
   1295  1.17    mrg <h3 class="heading">xtensa*-*-linux*</h3>
   1296   1.1    mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1297   1.1    mrg shared objects and the GNU C library (glibc).  It also generates
   1298   1.1    mrg position-independent code (PIC) regardless of whether the
   1299  1.10    mrg <samp>-fpic</samp> or <samp>-fPIC</samp> options are used.  In other
   1300   1.1    mrg respects, this target is the same as the
   1301  1.10    mrg <a href="#xtensa*-*-elf">&lsquo;<samp>xtensa*-*-elf</samp>&rsquo;</a> target.
   1302  1.10    mrg </p>
   1303  1.10    mrg <hr />
   1304  1.17    mrg <a name="windows"></a><a name="Microsoft-Windows"></a>
   1305  1.17    mrg <h3 class="heading">Microsoft Windows</h3>
   1306   1.1    mrg 
   1307  1.17    mrg <a name="Intel-16-bit-versions"></a>
   1308  1.17    mrg <h4 class="subheading">Intel 16-bit versions</h4>
   1309   1.1    mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1310   1.1    mrg supported.
   1311  1.10    mrg </p>
   1312  1.10    mrg <p>However, the 32-bit port has limited support for Microsoft
   1313   1.1    mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1314  1.10    mrg </p>
   1315  1.17    mrg <a name="Intel-32-bit-versions"></a>
   1316  1.17    mrg <h4 class="subheading">Intel 32-bit versions</h4>
   1317   1.1    mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1318   1.1    mrg XP, and Windows Vista, are supported by several different target
   1319   1.1    mrg platforms.  These targets differ in which Windows subsystem they target
   1320   1.1    mrg and which C libraries are used.
   1321  1.10    mrg </p>
   1322  1.10    mrg <ul>
   1323  1.10    mrg <li> Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1324  1.10    mrg Linux API emulation layer in the Win32 subsystem.
   1325  1.10    mrg </li><li> MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1326  1.10    mrg the Win32 subsystem that provides a subset of POSIX.
   1327  1.10    mrg </li><li> MKS i386-pc-mks: NuTCracker from MKS.  See
   1328  1.10    mrg <a href="https://www.mkssoftware.com">https://www.mkssoftware.com</a> for more information.
   1329  1.10    mrg </li></ul>
   1330   1.1    mrg 
   1331  1.17    mrg <a name="Intel-64-bit-versions"></a>
   1332  1.17    mrg <h4 class="subheading">Intel 64-bit versions</h4>
   1333   1.1    mrg <p>GCC contains support for x86-64 using the mingw-w64
   1334  1.15    mrg runtime library, available from <a href="https://www.mingw-w64.org/downloads/">https://www.mingw-w64.org/downloads/</a>.
   1335   1.1    mrg This library should be used with the target triple x86_64-pc-mingw32.
   1336  1.10    mrg </p>
   1337  1.17    mrg <a name="Windows-CE"></a>
   1338  1.17    mrg <h4 class="subheading">Windows CE</h4>
   1339   1.3  skrll <p>Windows CE is supported as a target only on Hitachi
   1340   1.1    mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1341  1.10    mrg </p>
   1342  1.17    mrg <a name="Other-Windows-Platforms"></a>
   1343  1.17    mrg <h4 class="subheading">Other Windows Platforms</h4>
   1344   1.1    mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1345  1.10    mrg </p>
   1346  1.10    mrg <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1347   1.1    mrg support the Interix subsystem.  See above.
   1348  1.10    mrg </p>
   1349  1.10    mrg <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1350  1.10    mrg </p>
   1351  1.10    mrg <p>UWIN support has been removed due to a lack of maintenance.
   1352  1.10    mrg </p>
   1353  1.10    mrg <hr />
   1354  1.17    mrg <a name="x-x-cygwin"></a><a name="g_t*-*-cygwin"></a>
   1355  1.17    mrg <h3 class="heading">*-*-cygwin</h3>
   1356   1.1    mrg <p>Ports of GCC are included with the
   1357   1.1    mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1358  1.10    mrg </p>
   1359  1.10    mrg <p>GCC will build under Cygwin without modification; it does not build
   1360  1.10    mrg with Microsoft&rsquo;s C++ compiler and there are no plans to make it do so.
   1361  1.10    mrg </p>
   1362  1.10    mrg <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1363   1.1    mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1364   1.1    mrg used with as up-to-date a version of binutils as possible; use either
   1365   1.1    mrg the latest official GNU binutils release in the Cygwin distribution,
   1366   1.1    mrg or version 2.20 or above if building your own.
   1367  1.10    mrg </p>
   1368  1.10    mrg <hr />
   1369  1.17    mrg <a name="x-x-mingw32"></a><a name="g_t*-*-mingw32"></a>
   1370  1.17    mrg <h3 class="heading">*-*-mingw32</h3>
   1371  1.10    mrg <p>GCC will build with and support only MinGW runtime 3.12 and later.
   1372   1.1    mrg Earlier versions of headers are incompatible with the new default semantics
   1373   1.1    mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1374  1.10    mrg </p>
   1375  1.15    mrg <p>To support emitting DWARF debugging info you need to use GNU binutils
   1376  1.15    mrg version 2.16 or above containing support for the <code>.secrel32</code>
   1377  1.15    mrg assembler pseudo-op.
   1378  1.15    mrg </p>
   1379  1.10    mrg <hr />
   1380  1.17    mrg <a name="older"></a><a name="Older-systems"></a>
   1381  1.17    mrg <h3 class="heading">Older systems</h3>
   1382   1.1    mrg <p>GCC contains support files for many older (1980s and early
   1383   1.1    mrg 1990s) Unix variants.  For the most part, support for these systems
   1384   1.1    mrg has not been deliberately removed, but it has not been maintained for
   1385   1.1    mrg several years and may suffer from bitrot.
   1386  1.10    mrg </p>
   1387  1.10    mrg <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems.
   1388   1.1    mrg Support for these systems is still present in that release, but
   1389  1.10    mrg <code>configure</code> will fail unless the <samp>--enable-obsolete</samp>
   1390   1.1    mrg option is given.  Unless a maintainer steps forward, support for these
   1391   1.1    mrg systems will be removed from the next release of GCC.
   1392  1.10    mrg </p>
   1393  1.10    mrg <p>Support for old systems as hosts for GCC can cause problems if the
   1394   1.1    mrg workarounds for compiler, library and operating system bugs affect the
   1395   1.1    mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1396   1.1    mrg bring GCC up on such a system, if still possible with current GCC, may
   1397   1.1    mrg require first installing an old version of GCC which did work on that
   1398   1.1    mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1399   1.1    mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1400  1.10    mrg <samp>old-releases</samp> directory on the <a href="../mirrors.html">GCC mirror
   1401  1.10    mrg sites</a>.  Header bugs may generally be avoided using
   1402  1.10    mrg <code>fixincludes</code>, but bugs or deficiencies in libraries and the
   1403   1.1    mrg operating system may still cause problems.
   1404  1.10    mrg </p>
   1405  1.10    mrg <p>Support for older systems as targets for cross-compilation is less
   1406   1.1    mrg problematic than support for them as hosts for GCC; if an enthusiast
   1407   1.1    mrg wishes to make such a target work again (including resurrecting any of
   1408   1.1    mrg the targets that never worked with GCC 2, starting from the last
   1409   1.1    mrg version before they were removed), patches
   1410   1.1    mrg <a href="../contribute.html">following the usual requirements</a> would be
   1411   1.1    mrg likely to be accepted, since they should not affect the support for more
   1412   1.1    mrg modern targets.
   1413  1.10    mrg </p>
   1414  1.10    mrg <p>For some systems, old versions of GNU binutils may also be useful,
   1415  1.10    mrg and are available from <samp>pub/binutils/old-releases</samp> on
   1416   1.9    mrg <a href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1417  1.10    mrg </p>
   1418  1.10    mrg <p>Some of the information on specific systems above relates to
   1419   1.1    mrg such older systems, but much of the information
   1420   1.1    mrg about GCC on such systems (which may no longer be applicable to
   1421   1.1    mrg current GCC) is to be found in the GCC texinfo manual.
   1422  1.10    mrg </p>
   1423  1.10    mrg <hr />
   1424  1.18    mrg <a name="elf"></a><a name="all-ELF-targets-_0028SVR4_002c-Solaris_002c-etc_002e_0029"></a>
   1425  1.18    mrg <h3 class="heading">all ELF targets (SVR4, Solaris, etc.)</h3>
   1426   1.1    mrg <p>C++ support is significantly better on ELF targets if you use the
   1427   1.1    mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1428   1.1    mrg inlines, vtables and template instantiations will be discarded
   1429   1.1    mrg automatically.
   1430  1.10    mrg </p>
   1431   1.1    mrg 
   1432  1.10    mrg <hr />
   1433  1.10    mrg <p>
   1434   1.1    mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1435  1.10    mrg </p>
   1436  1.10    mrg 
   1437  1.10    mrg 
   1438  1.10    mrg 
   1439  1.10    mrg 
   1440   1.1    mrg 
   1441  1.10    mrg </body>
   1442  1.10    mrg </html>
   1443