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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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     88   1.8    mrg 
     89  1.14    mrg <a name="index-Specific"></a>
     90  1.14    mrg <a name="index-Specific-installation-notes"></a>
     91  1.14    mrg <a name="index-Target-specific-installation"></a>
     92  1.14    mrg <a name="index-Host-specific-installation"></a>
     93  1.14    mrg <a name="index-Target-specific-installation-notes"></a>
     94   1.6    mrg 
     95  1.10    mrg <p>Please read this document carefully <em>before</em> installing the
     96  1.10    mrg GNU Compiler Collection on your machine.
     97  1.10    mrg </p>
     98  1.10    mrg <p>Note that this list of install notes is <em>not</em> a list of supported
     99  1.10    mrg hosts or targets.  Not all supported hosts and targets are listed
    100  1.10    mrg here, only the ones that require host-specific or target-specific
    101  1.10    mrg information have to. 
    102  1.10    mrg </p>
    103  1.10    mrg <ul>
    104  1.10    mrg <li> <a href="#aarch64-x-x">aarch64*-*-*</a>
    105  1.10    mrg </li><li> <a href="#alpha-x-x">alpha*-*-*</a>
    106  1.15    mrg </li><li> <a href="#amdgcn-x-amdhsa">amdgcn-*-amdhsa</a>
    107  1.12    mrg </li><li> <a href="#amd64-x-solaris2">amd64-*-solaris2*</a>
    108  1.15    mrg </li><li> <a href="#arc-x-elf32">arc-*-elf32</a>
    109  1.15    mrg </li><li> <a href="#arc-linux-uclibc">arc-linux-uclibc</a>
    110  1.10    mrg </li><li> <a href="#arm-x-eabi">arm-*-eabi</a>
    111  1.10    mrg </li><li> <a href="#avr">avr</a>
    112  1.10    mrg </li><li> <a href="#bfin">Blackfin</a>
    113  1.15    mrg </li><li> <a href="#cris">cris</a>
    114  1.10    mrg </li><li> <a href="#dos">DOS</a>
    115  1.15    mrg </li><li> <a href="#epiphany-x-elf">epiphany-*-elf</a>
    116  1.15    mrg </li><li> <a href="#ft32-x-elf">ft32-*-elf</a>
    117  1.10    mrg </li><li> <a href="#x-x-freebsd">*-*-freebsd*</a>
    118  1.10    mrg </li><li> <a href="#h8300-hms">h8300-hms</a>
    119  1.10    mrg </li><li> <a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
    120  1.10    mrg </li><li> <a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
    121  1.10    mrg </li><li> <a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
    122  1.10    mrg </li><li> <a href="#x-x-linux-gnu">*-*-linux-gnu</a>
    123  1.10    mrg </li><li> <a href="#ix86-x-linux">i?86-*-linux*</a>
    124  1.12    mrg </li><li> <a href="#ix86-x-solaris2">i?86-*-solaris2*</a>
    125  1.10    mrg </li><li> <a href="#ia64-x-linux">ia64-*-linux</a>
    126  1.10    mrg </li><li> <a href="#ia64-x-hpux">ia64-*-hpux*</a>
    127  1.10    mrg </li><li> <a href="#x-ibm-aix">*-ibm-aix*</a>
    128  1.10    mrg </li><li> <a href="#iq2000-x-elf">iq2000-*-elf</a>
    129  1.15    mrg </li><li> <a href="#loongarch">loongarch</a>
    130  1.10    mrg </li><li> <a href="#lm32-x-elf">lm32-*-elf</a>
    131  1.10    mrg </li><li> <a href="#lm32-x-uclinux">lm32-*-uclinux</a>
    132  1.10    mrg </li><li> <a href="#m32c-x-elf">m32c-*-elf</a>
    133  1.10    mrg </li><li> <a href="#m32r-x-elf">m32r-*-elf</a>
    134  1.10    mrg </li><li> <a href="#m68k-x-x">m68k-*-*</a>
    135  1.15    mrg </li><li> <a href="#m68k-x-uclinux">m68k-*-uclinux</a>
    136  1.10    mrg </li><li> <a href="#microblaze-x-elf">microblaze-*-elf</a>
    137  1.10    mrg </li><li> <a href="#mips-x-x">mips-*-*</a>
    138  1.15    mrg </li><li> <a href="#moxie-x-elf">moxie-*-elf</a>
    139  1.15    mrg </li><li> <a href="#msp430-x-elf">msp430-*-elf</a>
    140  1.10    mrg </li><li> <a href="#nds32le-x-elf">nds32le-*-elf</a>
    141  1.10    mrg </li><li> <a href="#nds32be-x-elf">nds32be-*-elf</a>
    142  1.10    mrg </li><li> <a href="#nvptx-x-none">nvptx-*-none</a>
    143  1.11    mrg </li><li> <a href="#or1k-x-elf">or1k-*-elf</a>
    144  1.11    mrg </li><li> <a href="#or1k-x-linux">or1k-*-linux</a>
    145  1.10    mrg </li><li> <a href="#powerpc-x-x">powerpc*-*-*</a>
    146  1.10    mrg </li><li> <a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
    147  1.10    mrg </li><li> <a href="#powerpc-x-elf">powerpc-*-elf</a>
    148  1.10    mrg </li><li> <a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
    149  1.10    mrg </li><li> <a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
    150  1.10    mrg </li><li> <a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
    151  1.10    mrg </li><li> <a href="#powerpc-x-eabi">powerpc-*-eabi</a>
    152  1.10    mrg </li><li> <a href="#powerpcle-x-elf">powerpcle-*-elf</a>
    153  1.10    mrg </li><li> <a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
    154  1.10    mrg </li><li> <a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
    155  1.10    mrg </li><li> <a href="#riscv32-x-elf">riscv32-*-elf</a>
    156  1.10    mrg </li><li> <a href="#riscv32-x-linux">riscv32-*-linux</a>
    157  1.10    mrg </li><li> <a href="#riscv64-x-elf">riscv64-*-elf</a>
    158  1.10    mrg </li><li> <a href="#riscv64-x-linux">riscv64-*-linux</a>
    159  1.15    mrg </li><li> <a href="#rl78-x-elf">rl78-*-elf</a>
    160  1.15    mrg </li><li> <a href="#rx-x-elf">rx-*-elf</a>
    161  1.10    mrg </li><li> <a href="#s390-x-linux">s390-*-linux*</a>
    162  1.10    mrg </li><li> <a href="#s390x-x-linux">s390x-*-linux*</a>
    163  1.10    mrg </li><li> <a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    164  1.10    mrg </li><li> <a href="#x-x-solaris2">*-*-solaris2*</a>
    165  1.10    mrg </li><li> <a href="#sparc-x-x">sparc*-*-*</a>
    166  1.10    mrg </li><li> <a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    167  1.10    mrg </li><li> <a href="#sparc-x-linux">sparc-*-linux*</a>
    168  1.10    mrg </li><li> <a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    169  1.10    mrg </li><li> <a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    170  1.10    mrg </li><li> <a href="#c6x-x-x">c6x-*-*</a>
    171  1.10    mrg </li><li> <a href="#tilegx-x-linux">tilegx-*-linux*</a>
    172  1.10    mrg </li><li> <a href="#tilegxbe-x-linux">tilegxbe-*-linux*</a>
    173  1.10    mrg </li><li> <a href="#tilepro-x-linux">tilepro-*-linux*</a>
    174  1.10    mrg </li><li> <a href="#visium-x-elf">visium-*-elf</a>
    175  1.10    mrg </li><li> <a href="#x-x-vxworks">*-*-vxworks*</a>
    176  1.10    mrg </li><li> <a href="#x86-64-x-x">x86_64-*-*, amd64-*-*</a>
    177  1.12    mrg </li><li> <a href="#x86-64-x-solaris2">x86_64-*-solaris2*</a>
    178  1.10    mrg </li><li> <a href="#xtensa-x-elf">xtensa*-*-elf</a>
    179  1.10    mrg </li><li> <a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    180  1.10    mrg </li><li> <a href="#windows">Microsoft Windows</a>
    181  1.10    mrg </li><li> <a href="#x-x-cygwin">*-*-cygwin</a>
    182  1.10    mrg </li><li> <a href="#x-x-mingw32">*-*-mingw32</a>
    183  1.10    mrg </li><li> <a href="#os2">OS/2</a>
    184  1.10    mrg </li><li> <a href="#older">Older systems</a>
    185  1.10    mrg </li></ul>
    186  1.10    mrg 
    187  1.10    mrg <ul>
    188  1.10    mrg <li> <a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.)
    189  1.10    mrg </li></ul>
    190  1.10    mrg 
    191  1.10    mrg 
    192  1.10    mrg <!-- -------- host/target specific issues start here ---------------- -->
    193  1.10    mrg <hr />
    194  1.14    mrg <a name="aarch64-x-x"></a><a name="aarch64*-*-*"></a>
    195  1.14    mrg <h3 class="heading">aarch64*-*-*</h3>
    196  1.10    mrg <p>Binutils pre 2.24 does not have support for selecting <samp>-mabi</samp> and
    197  1.10    mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    198  1.10    mrg not support option <samp>-mabi=ilp32</samp>.
    199  1.10    mrg </p>
    200  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    201  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    202  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> option.  This will enable the fix by
    203  1.10    mrg default and can be explicitly disabled during compilation by passing the
    204  1.10    mrg <samp>-mno-fix-cortex-a53-835769</samp> option.  Conversely,
    205  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> will disable the workaround by
    206  1.10    mrg default.  The workaround is disabled by default if neither of
    207  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> or
    208  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> is given at configure time.
    209  1.10    mrg </p>
    210  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    211  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    212  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> option.  This workaround is applied at
    213  1.10    mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    214  1.10    mrg to the linker.  It can be explicitly disabled during compilation by passing the
    215  1.10    mrg <samp>-mno-fix-cortex-a53-843419</samp> option.  Conversely,
    216  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> will disable the workaround by default.
    217  1.10    mrg The workaround is disabled by default if neither of
    218  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> or
    219  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> is given at configure time.
    220  1.10    mrg </p>
    221  1.11    mrg <p>To enable Branch Target Identification Mechanism and Return Address Signing by
    222  1.11    mrg default at configure time use the <samp>--enable-standard-branch-protection</samp>
    223  1.11    mrg option.  This is equivalent to having <samp>-mbranch-protection=standard</samp>
    224  1.11    mrg during compilation.  This can be explicitly disabled during compilation by
    225  1.11    mrg passing the <samp>-mbranch-protection=none</samp> option which turns off all
    226  1.11    mrg types of branch protections.  Conversely,
    227  1.11    mrg <samp>--disable-standard-branch-protection</samp> will disable both the
    228  1.11    mrg protections by default.  This mechanism is turned off by default if neither
    229  1.11    mrg of the options are given at configure time.
    230  1.11    mrg </p>
    231  1.10    mrg <hr />
    232  1.14    mrg <a name="alpha-x-x"></a><a name="alpha*-*-*"></a>
    233  1.14    mrg <h3 class="heading">alpha*-*-*</h3>
    234  1.10    mrg <p>This section contains general configuration information for all
    235  1.10    mrg Alpha-based platforms using ELF.  In addition to reading this
    236  1.10    mrg section, please read all other sections that match your target.
    237  1.10    mrg </p>
    238  1.10    mrg <hr />
    239  1.14    mrg <a name="amd64-x-solaris2"></a><a name="amd64-*-solaris2*"></a>
    240  1.14    mrg <h3 class="heading">amd64-*-solaris2*</h3>
    241  1.12    mrg <p>This is a synonym for &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo;.
    242  1.10    mrg </p>
    243  1.10    mrg <hr />
    244  1.14    mrg <a name="amdgcn-x-amdhsa"></a><a name="amdgcn-*-amdhsa"></a>
    245  1.14    mrg <h3 class="heading">amdgcn-*-amdhsa</h3>
    246  1.11    mrg <p>AMD GCN GPU target.
    247  1.11    mrg </p>
    248  1.15    mrg <p>Instead of GNU Binutils, you will need to install LLVM 13.0.1, or later, and copy
    249  1.12    mrg <samp>bin/llvm-mc</samp> to <samp>amdgcn-amdhsa/bin/as</samp>,
    250  1.12    mrg <samp>bin/lld</samp> to <samp>amdgcn-amdhsa/bin/ld</samp>,
    251  1.12    mrg <samp>bin/llvm-nm</samp> to <samp>amdgcn-amdhsa/bin/nm</samp>, and
    252  1.12    mrg <samp>bin/llvm-ar</samp> to both <samp>bin/amdgcn-amdhsa-ar</samp> and
    253  1.12    mrg <samp>bin/amdgcn-amdhsa-ranlib</samp>.
    254  1.11    mrg </p>
    255  1.15    mrg <p>Use Newlib (3.2.0, or newer).
    256  1.11    mrg </p>
    257  1.11    mrg <p>To run the binaries, install the HSA Runtime from the
    258  1.11    mrg <a href="https://rocm.github.io">ROCm Platform</a>, and use
    259  1.12    mrg <samp>libexec/gcc/amdhsa-amdhsa/<var>version</var>/gcn-run</samp> to launch them
    260  1.11    mrg on the GPU.
    261  1.11    mrg </p>
    262  1.11    mrg <hr />
    263  1.14    mrg <a name="arc-x-elf32"></a><a name="arc-*-elf32"></a>
    264  1.14    mrg <h3 class="heading">arc-*-elf32</h3>
    265  1.10    mrg 
    266  1.10    mrg <p>Use &lsquo;<samp>configure --target=arc-elf32 --with-cpu=<var>cpu</var> --enable-languages=&quot;c,c++&quot;</samp>&rsquo;
    267  1.10    mrg to configure GCC, with <var>cpu</var> being one of &lsquo;<samp>arc600</samp>&rsquo;, &lsquo;<samp>arc601</samp>&rsquo;,
    268  1.10    mrg or &lsquo;<samp>arc700</samp>&rsquo;.
    269  1.10    mrg </p>
    270  1.10    mrg <hr />
    271  1.14    mrg <a name="arc-linux-uclibc"></a><a name="arc-linux-uclibc-1"></a>
    272  1.14    mrg <h3 class="heading">arc-linux-uclibc</h3>
    273  1.10    mrg 
    274  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.
    275  1.10    mrg </p>
    276  1.10    mrg <hr />
    277  1.14    mrg <a name="arm-x-eabi"></a><a name="arm-*-eabi"></a>
    278  1.14    mrg <h3 class="heading">arm-*-eabi</h3>
    279   1.9    mrg <p>ARM-family processors.
    280  1.10    mrg </p>
    281  1.10    mrg <p>Building the Ada frontend commonly fails (an infinite loop executing
    282   1.7    mrg <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    283   1.7    mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    284  1.10    mrg </p>
    285  1.10    mrg <hr />
    286  1.14    mrg <a name="avr"></a><a name="avr-1"></a>
    287  1.14    mrg <h3 class="heading">avr</h3>
    288   1.1    mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    289  1.10    mrg applications.  There are no standard Unix configurations.
    290   1.1    mrg See &ldquo;AVR Options&rdquo; in the main manual
    291   1.1    mrg for the list of supported MCU types.
    292  1.10    mrg </p>
    293  1.10    mrg <p>Use &lsquo;<samp>configure --target=avr --enable-languages=&quot;c&quot;</samp>&rsquo; to configure GCC.
    294  1.10    mrg </p>
    295  1.10    mrg <p>Further installation notes and other useful information about AVR tools
    296   1.1    mrg can also be obtained from:
    297  1.10    mrg </p>
    298  1.10    mrg <ul>
    299  1.10    mrg <li> <a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    300  1.10    mrg </li><li> <a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    301  1.10    mrg </li></ul>
    302  1.10    mrg 
    303  1.10    mrg <p>The following error:
    304  1.14    mrg </p><div class="smallexample">
    305  1.14    mrg <pre class="smallexample">Error: register required
    306  1.10    mrg </pre></div>
    307  1.10    mrg 
    308  1.10    mrg <p>indicates that you should upgrade to a newer version of the binutils.
    309  1.10    mrg </p>
    310  1.10    mrg <hr />
    311  1.14    mrg <a name="bfin"></a><a name="Blackfin"></a>
    312  1.14    mrg <h3 class="heading">Blackfin</h3>
    313  1.10    mrg <p>The Blackfin processor, an Analog Devices DSP.
    314   1.1    mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    315  1.10    mrg </p>
    316  1.10    mrg <p>More information, and a version of binutils with support for this processor,
    317  1.12    mrg are available at <a href="https://sourceforge.net/projects/adi-toolchain/">https://sourceforge.net/projects/adi-toolchain/</a>.
    318  1.10    mrg </p>
    319  1.10    mrg <hr />
    320  1.14    mrg <a name="cr16"></a><a name="CR16"></a>
    321  1.14    mrg <h3 class="heading">CR16</h3>
    322   1.5    mrg <p>The CR16 CompactRISC architecture is a 16-bit architecture. This
    323   1.5    mrg architecture is used in embedded applications.
    324  1.10    mrg </p>
    325   1.3  skrll 
    326  1.10    mrg <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    327  1.10    mrg </p>
    328  1.10    mrg <p>Use &lsquo;<samp>configure --target=cr16-elf --enable-languages=c,c++</samp>&rsquo; to configure
    329  1.10    mrg GCC&nbsp;for building a CR16 elf cross-compiler.
    330  1.10    mrg </p>
    331  1.10    mrg <p>Use &lsquo;<samp>configure --target=cr16-uclinux --enable-languages=c,c++</samp>&rsquo; to
    332  1.10    mrg configure GCC&nbsp;for building a CR16 uclinux cross-compiler.
    333  1.10    mrg </p>
    334  1.10    mrg <hr />
    335  1.14    mrg <a name="cris"></a><a name="CRIS"></a>
    336  1.14    mrg <h3 class="heading">CRIS</h3>
    337  1.15    mrg <p>CRIS is a CPU architecture in Axis Communications systems-on-a-chip, for
    338  1.15    mrg example the ETRAX series.  These are used in embedded applications.
    339  1.10    mrg </p>
    340  1.10    mrg <p>See &ldquo;CRIS Options&rdquo; in the main manual
    341   1.1    mrg for a list of CRIS-specific options.
    342  1.10    mrg </p>
    343  1.15    mrg <p>Use &lsquo;<samp>configure --target=cris-elf</samp>&rsquo; to configure GCC&nbsp;for building
    344  1.15    mrg a cross-compiler for CRIS.
    345  1.10    mrg <hr />
    346  1.15    mrg <a name="dos"></a></p><a name="DOS"></a>
    347  1.14    mrg <h3 class="heading">DOS</h3>
    348   1.1    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    349  1.10    mrg </p>
    350  1.10    mrg <p>You cannot install GCC by itself on MSDOS; it will not compile under
    351   1.1    mrg any MSDOS compiler except itself.  You need to get the complete
    352   1.1    mrg compilation package DJGPP, which includes binaries as well as sources,
    353   1.1    mrg and includes all the necessary compilation tools and libraries.
    354  1.10    mrg </p>
    355  1.10    mrg <hr />
    356  1.14    mrg <a name="epiphany-x-elf"></a><a name="epiphany-*-elf"></a>
    357  1.14    mrg <h3 class="heading">epiphany-*-elf</h3>
    358  1.10    mrg <p>Adapteva Epiphany.
    359   1.3  skrll This configuration is intended for embedded systems.
    360  1.10    mrg </p>
    361  1.10    mrg <hr />
    362  1.14    mrg <a name="x-x-freebsd"></a><a name="g_t*-*-freebsd*"></a>
    363  1.14    mrg <h3 class="heading">*-*-freebsd*</h3>
    364  1.10    mrg <p>In order to better utilize FreeBSD base system functionality and match
    365   1.3  skrll the configuration of the system compiler, GCC 4.5 and above as well as
    366   1.3  skrll GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    367   1.3  skrll on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    368   1.3  skrll (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    369  1.10    mrg <samp>libgcc_s.so.1</samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    370   1.3  skrll by GCC 4.5 and above.
    371  1.10    mrg </p>
    372  1.10    mrg <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    373  1.10    mrg for all CPU architectures.  You may use <samp>-gstabs</samp> instead of
    374  1.10    mrg <samp>-g</samp>, if you really want the old debugging format.  There are
    375   1.1    mrg no known issues with mixing object files and libraries with different
    376   1.1    mrg debugging formats.  Otherwise, this release of GCC should now match
    377   1.1    mrg more of the configuration used in the stock FreeBSD configuration of
    378  1.10    mrg GCC.  In particular, <samp>--enable-threads</samp> is now configured by
    379   1.1    mrg default.  However, as a general user, do not attempt to replace the
    380   1.1    mrg system compiler with this release.  Known to bootstrap and check with
    381   1.1    mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    382   1.1    mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    383   1.1    mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    384  1.10    mrg </p>
    385  1.10    mrg <p>The version of binutils installed in <samp>/usr/bin</samp> probably works
    386   1.1    mrg with this release of GCC.  Bootstrapping against the latest GNU
    387  1.10    mrg binutils and/or the version found in <samp>/usr/ports/devel/binutils</samp> has
    388   1.1    mrg been known to enable additional features and improve overall testsuite
    389   1.9    mrg results.  However, it is currently known that boehm-gc may not configure
    390   1.9    mrg properly on FreeBSD prior to the FreeBSD 7.0 release with GNU binutils
    391   1.9    mrg after 2.16.1.
    392  1.10    mrg </p>
    393  1.10    mrg <hr />
    394  1.14    mrg <a name="ft32-x-elf"></a><a name="ft32-*-elf"></a>
    395  1.14    mrg <h3 class="heading">ft32-*-elf</h3>
    396  1.10    mrg <p>The FT32 processor.
    397   1.7    mrg This configuration is intended for embedded systems.
    398  1.10    mrg </p>
    399  1.10    mrg <hr />
    400  1.14    mrg <a name="h8300-hms"></a><a name="h8300-hms-1"></a>
    401  1.14    mrg <h3 class="heading">h8300-hms</h3>
    402   1.1    mrg <p>Renesas H8/300 series of processors.
    403  1.10    mrg </p>
    404  1.10    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    405  1.10    mrg </p>
    406  1.10    mrg <p>The calling convention and structure layout has changed in release 2.6.
    407   1.1    mrg All code must be recompiled.  The calling convention now passes the
    408   1.1    mrg first three arguments in function calls in registers.  Structures are no
    409   1.1    mrg longer a multiple of 2 bytes.
    410  1.10    mrg </p>
    411  1.10    mrg <hr />
    412  1.14    mrg <a name="hppa-hp-hpux"></a><a name="hppa*-hp-hpux*"></a>
    413  1.14    mrg <h3 class="heading">hppa*-hp-hpux*</h3>
    414   1.1    mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    415  1.10    mrg </p>
    416  1.10    mrg <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    417   1.1    mrg later is recommended.
    418  1.10    mrg </p>
    419  1.10    mrg <p>It may be helpful to configure GCC with the
    420  1.10    mrg <a href="./configure.html#with-gnu-as"><samp>--with-gnu-as</samp></a> and
    421  1.10    mrg <samp>--with-as=&hellip;</samp> options to ensure that GCC can find GAS.
    422  1.10    mrg </p>
    423  1.10    mrg <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    424  1.10    mrg not work.  It shouldn&rsquo;t be used with any languages other than C due to its
    425   1.1    mrg many limitations.
    426  1.10    mrg </p>
    427  1.10    mrg <p>Specifically, <samp>-g</samp> does not work (HP-UX uses a peculiar debugging
    428   1.1    mrg format which GCC does not know about).  It also inserts timestamps
    429   1.1    mrg into each object file it creates, causing the 3-stage comparison test to
    430   1.1    mrg fail during a bootstrap.  You should be able to continue by saying
    431  1.10    mrg &lsquo;<samp>make all-host all-target</samp>&rsquo; after getting the failure from &lsquo;<samp>make</samp>&rsquo;.
    432  1.10    mrg </p>
    433  1.10    mrg <p>Various GCC features are not supported.  For example, it does not support weak
    434   1.1    mrg symbols or alias definitions.  As a result, explicit template instantiations
    435   1.1    mrg are required when using C++.  This makes it difficult if not impossible to
    436   1.1    mrg build many C++ applications.
    437  1.10    mrg </p>
    438  1.10    mrg <p>There are two default scheduling models for instructions.  These are
    439   1.1    mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    440  1.10    mrg architecture specified for the target machine when configuring.
    441   1.1    mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    442  1.10    mrg the target is a &lsquo;<samp>hppa1*</samp>&rsquo; machine.
    443  1.10    mrg </p>
    444  1.10    mrg <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    445   1.1    mrg it is important to completely specify the machine architecture when
    446   1.1    mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    447   1.1    mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    448   1.1    mrg default scheduling model is desired.
    449  1.10    mrg </p>
    450  1.10    mrg <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    451  1.10    mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
    452   1.1    mrg This namespace change might cause problems when bootstrapping with
    453   1.1    mrg an earlier version of GCC or the HP compiler as essentially the same
    454   1.1    mrg namespace is required for an entire build.  This problem can be avoided
    455  1.10    mrg in a number of ways.  With HP cc, <code>UNIX_STD</code> can be set to &lsquo;<samp>95</samp>&rsquo;
    456  1.10    mrg or &lsquo;<samp>98</samp>&rsquo;.  Another way is to add an appropriate set of predefines
    457  1.10    mrg to <code>CC</code>.  The description for the <samp>munix=</samp> option contains
    458   1.1    mrg a list of the predefines used with each standard.
    459  1.10    mrg </p>
    460  1.10    mrg <p>More specific information to &lsquo;<samp>hppa*-hp-hpux*</samp>&rsquo; targets follows.
    461  1.10    mrg </p>
    462  1.10    mrg <hr />
    463  1.14    mrg <a name="hppa-hp-hpux10"></a><a name="hppa*-hp-hpux10"></a>
    464  1.14    mrg <h3 class="heading">hppa*-hp-hpux10</h3>
    465   1.1    mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    466   1.1    mrg <code>PHCO_19798</code> from HP.
    467  1.10    mrg </p>
    468  1.10    mrg <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    469   1.1    mrg used for one-only code and data.  This resolves many of the previous
    470   1.1    mrg problems in using C++ on this target.  However, the ABI is not compatible
    471   1.1    mrg with the one implemented under HP-UX 11 using secondary definitions.
    472  1.10    mrg </p>
    473  1.10    mrg <hr />
    474  1.14    mrg <a name="hppa-hp-hpux11"></a><a name="hppa*-hp-hpux11"></a>
    475  1.14    mrg <h3 class="heading">hppa*-hp-hpux11</h3>
    476   1.1    mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    477   1.1    mrg be used to compile GCC 3.0 and up.
    478  1.10    mrg </p>
    479  1.10    mrg <p>The libffi library haven&rsquo;t been ported to 64-bit HP-UX&nbsp;and doesn&rsquo;t build.
    480  1.10    mrg </p>
    481  1.10    mrg <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    482   1.1    mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    483   1.9    mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    484   1.1    mrg only available for the 32-bit PA-RISC runtime.
    485  1.10    mrg </p>
    486  1.10    mrg <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    487  1.10    mrg bundled compiler supports only traditional C; you will need either HP&rsquo;s
    488   1.1    mrg unbundled compiler, or a binary distribution of GCC.
    489  1.10    mrg </p>
    490  1.10    mrg <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    491   1.1    mrg but the process requires several steps.  GCC 3.3 can then be used to
    492   1.9    mrg build later versions.
    493  1.10    mrg </p>
    494  1.10    mrg <p>There are several possible approaches to building the distribution.
    495   1.1    mrg Binutils can be built first using the HP tools.  Then, the GCC
    496   1.1    mrg distribution can be built.  The second approach is to build GCC
    497  1.10    mrg first using the HP tools, then build binutils, then rebuild GCC.
    498   1.1    mrg There have been problems with various binary distributions, so it
    499   1.1    mrg is best not to start from a binary distribution.
    500  1.10    mrg </p>
    501  1.10    mrg <p>On 64-bit capable systems, there are two distinct targets.  Different
    502   1.1    mrg installation prefixes must be used if both are to be installed on
    503  1.10    mrg the same system.  The &lsquo;<samp>hppa[1-2]*-hp-hpux11*</samp>&rsquo; target generates code
    504  1.10    mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker.
    505  1.10    mrg The &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target generates 64-bit code for the
    506   1.1    mrg PA-RISC 2.0 architecture.
    507  1.10    mrg </p>
    508  1.10    mrg <p>The script config.guess now selects the target type based on the compiler
    509  1.10    mrg detected during configuration.  You must define <code>PATH</code> or <code>CC</code> so
    510  1.10    mrg that configure finds an appropriate compiler for the initial bootstrap.
    511  1.10    mrg When <code>CC</code> is used, the definition should contain the options that are
    512  1.10    mrg needed whenever <code>CC</code> is used.
    513  1.10    mrg </p>
    514  1.10    mrg <p>Specifically, options that determine the runtime architecture must be
    515  1.10    mrg in <code>CC</code> to correctly select the target for the build.  It is also
    516  1.10    mrg convenient to place many other compiler options in <code>CC</code>.  For example,
    517  1.10    mrg <code>CC=&quot;cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE&quot;</code>
    518   1.1    mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    519  1.10    mrg 64-bit K&amp;R/bundled mode.  The <samp>+DA2.0W</samp> option will result in
    520  1.10    mrg the automatic selection of the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target.  The
    521   1.1    mrg macro definition table of cpp needs to be increased for a successful
    522   1.1    mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    523   1.1    mrg be defined when building with the bundled compiler, or when using the
    524  1.10    mrg <samp>-Ac</samp> option.  These defines aren&rsquo;t necessary with <samp>-Ae</samp>.
    525  1.10    mrg </p>
    526  1.10    mrg <p>It is best to explicitly configure the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target
    527  1.10    mrg with the <samp>--with-ld=&hellip;</samp> option.  This overrides the standard
    528   1.1    mrg search for ld.  The two linkers supported on this target require different
    529   1.1    mrg commands.  The default linker is determined during configuration.  As a
    530  1.10    mrg result, it&rsquo;s not possible to switch linkers in the middle of a GCC build.
    531   1.1    mrg This has been reported to sometimes occur in unified builds of binutils
    532   1.1    mrg and GCC.
    533  1.10    mrg </p>
    534  1.10    mrg <p>A recent linker patch must be installed for the correct operation of
    535   1.1    mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    536   1.1    mrg oldest linker patches that are known to work.  They are for HP-UX
    537   1.1    mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    538  1.10    mrg <code>PHSS_24304</code>, might be usable but it hasn&rsquo;t been tested.  These
    539   1.1    mrg patches have been superseded.  Consult the HP patch database to obtain
    540   1.1    mrg the currently recommended linker patch for your system.
    541  1.10    mrg </p>
    542  1.10    mrg <p>The patches are necessary for the support of weak symbols on the
    543   1.1    mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    544   1.1    mrg symbols are implemented using SOM secondary definition symbols.  Prior
    545  1.10    mrg to HP-UX 11, there are bugs in the linker support for secondary symbols.
    546   1.1    mrg The patches correct a problem of linker core dumps creating shared
    547   1.1    mrg libraries containing secondary symbols, as well as various other
    548   1.1    mrg linking issues involving secondary symbols.
    549  1.10    mrg </p>
    550  1.10    mrg <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    551   1.1    mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    552  1.10    mrg uses the linker <samp>+init</samp> and <samp>+fini</samp> options for the same
    553   1.1    mrg purpose.  The patches correct various problems with the +init/+fini
    554   1.1    mrg options, including program core dumps.  Binutils 2.14 corrects a
    555  1.10    mrg problem on the 64-bit port resulting from HP&rsquo;s non-standard use of
    556   1.1    mrg the .init and .fini sections for array initializers and finalizers.
    557  1.10    mrg </p>
    558  1.10    mrg <p>Although the HP and GNU linkers are both supported for the
    559  1.10    mrg &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target, it is strongly recommended that the
    560   1.1    mrg HP linker be used for link editing on this target.
    561  1.10    mrg </p>
    562  1.10    mrg <p>At this time, the GNU linker does not support the creation of long
    563   1.9    mrg branch stubs.  As a result, it cannot successfully link binaries
    564   1.1    mrg containing branch offsets larger than 8 megabytes.  In addition,
    565   1.1    mrg there are problems linking shared libraries, linking executables
    566  1.10    mrg with <samp>-static</samp>, and with dwarf2 unwind and exception support.
    567  1.10    mrg It also doesn&rsquo;t provide stubs for internal calls to global functions
    568   1.9    mrg in shared libraries, so these calls cannot be overloaded.
    569  1.10    mrg </p>
    570  1.10    mrg <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    571   1.1    mrg versioning is not supported.  It may be necessary to disable symbol
    572  1.10    mrg versioning with <samp>--disable-symvers</samp> when using GNU ld.
    573  1.10    mrg </p>
    574  1.10    mrg <p>POSIX threads are the default.  The optional DCE thread library is not
    575  1.10    mrg supported, so <samp>--enable-threads=dce</samp> does not work.
    576  1.10    mrg </p>
    577  1.10    mrg <hr />
    578  1.14    mrg <a name="x-x-linux-gnu"></a><a name="g_t*-*-linux-gnu"></a>
    579  1.14    mrg <h3 class="heading">*-*-linux-gnu</h3>
    580  1.15    mrg <p>The <code>.init_array</code> and <code>.fini_array</code> sections are enabled
    581  1.15    mrg unconditionally which requires at least glibc 2.1 and binutils 2.12.
    582  1.15    mrg </p>
    583   1.1    mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    584   1.1    mrg in glibc 2.2.5 and later.  More information is available in the
    585   1.1    mrg libstdc++-v3 documentation.
    586  1.10    mrg </p>
    587  1.10    mrg <hr />
    588  1.14    mrg <a name="ix86-x-linux"></a><a name="i_003f86-*-linux*"></a>
    589  1.14    mrg <h3 class="heading">i?86-*-linux*</h3>
    590  1.10    mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform.
    591  1.15    mrg See <a href="https://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    592  1.10    mrg </p>
    593  1.10    mrg <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    594   1.1    mrg possible you have a hardware problem.  Further information on this can be
    595  1.15    mrg found on <a href="https://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    596  1.10    mrg </p>
    597  1.10    mrg <hr />
    598  1.14    mrg <a name="ix86-x-solaris2"></a><a name="i_003f86-*-solaris2*"></a>
    599  1.14    mrg <h3 class="heading">i?86-*-solaris2*</h3>
    600  1.12    mrg <p>Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
    601  1.12    mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp>amd64-*-solaris2*</samp>&rsquo; or
    602  1.12    mrg &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo; configuration that corresponds to
    603  1.10    mrg &lsquo;<samp>sparcv9-sun-solaris2*</samp>&rsquo;.
    604  1.10    mrg </p>
    605  1.10    mrg <p>It is recommended that you configure GCC to use the GNU assembler.  The
    606  1.12    mrg versions included in Solaris 11.3, from GNU binutils 2.23.1 or
    607  1.12    mrg newer (available as <samp>/usr/bin/gas</samp> and
    608  1.10    mrg <samp>/usr/gnu/bin/as</samp>), work fine.  The current version, from GNU
    609  1.12    mrg binutils 2.34, is known to work.  Recent versions of the Solaris assembler in
    610  1.12    mrg <samp>/usr/bin/as</samp> work almost as well, though.
    611  1.12    mrg </p>
    612  1.12    mrg <p>For linking, the Solaris linker is preferred.  If you want to use the GNU
    613  1.12    mrg linker instead, the version in Solaris 11.3, from GNU binutils 2.23.1 or
    614  1.12    mrg newer (in <samp>/usr/gnu/bin/ld</samp> and <samp>/usr/bin/gld</samp>), works,
    615  1.12    mrg as does the latest version, from GNU binutils 2.34.
    616  1.10    mrg </p>
    617  1.10    mrg <p>To use GNU <code>as</code>, configure with the options
    618  1.12    mrg <samp>--with-gnu-as --with-as=/usr/gnu/bin/as</samp>.  It may be necessary
    619  1.10    mrg to configure with <samp>--without-gnu-ld --with-ld=/usr/ccs/bin/ld</samp> to
    620  1.12    mrg guarantee use of Solaris <code>ld</code>.
    621  1.10    mrg </p>
    622  1.10    mrg <hr />
    623  1.14    mrg <a name="ia64-x-linux"></a><a name="ia64-*-linux"></a>
    624  1.14    mrg <h3 class="heading">ia64-*-linux</h3>
    625   1.1    mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    626   1.1    mrg running GNU/Linux.
    627  1.10    mrg </p>
    628  1.10    mrg <p>If you are using the installed system libunwind library with
    629  1.10    mrg <samp>--with-system-libunwind</samp>, then you must use libunwind 0.98 or
    630   1.1    mrg later.
    631  1.10    mrg </p>
    632  1.10    mrg <hr />
    633  1.14    mrg <a name="ia64-x-hpux"></a><a name="ia64-*-hpux*"></a>
    634  1.14    mrg <h3 class="heading">ia64-*-hpux*</h3>
    635   1.1    mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    636   1.1    mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    637  1.10    mrg the option <samp>--with-gnu-as</samp> may be necessary.
    638  1.10    mrg </p>
    639  1.10    mrg <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    640  1.10    mrg GCC versions 3.2.3 and earlier, <samp>--enable-libunwind-exceptions</samp>
    641  1.10    mrg is required to build GCC.  For GCC 3.3 and later, this is the default.
    642  1.10    mrg For gcc 3.4.3 and later, <samp>--enable-libunwind-exceptions</samp> is
    643   1.1    mrg removed and the system libunwind library will always be used.
    644  1.10    mrg </p>
    645  1.10    mrg <hr />
    646  1.10    mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    647  1.14    mrg <a name="x-ibm-aix"></a><a name="g_t*-ibm-aix*"></a>
    648  1.14    mrg <h3 class="heading">*-ibm-aix*</h3>
    649  1.10    mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4.
    650   1.1    mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    651  1.10    mrg </p>
    652  1.10    mrg <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    653   1.1    mrg process resource limits (ulimit).  Hard limits are configured in the
    654  1.10    mrg <samp>/etc/security/limits</samp> system configuration file.
    655  1.10    mrg </p>
    656  1.10    mrg <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    657   1.7    mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    658   1.7    mrg G++ can bootstrap recent releases of GCC.
    659  1.10    mrg </p>
    660  1.10    mrg <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    661   1.1    mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    662   1.1    mrg requires a larger data segment, which can be enabled through the
    663   1.1    mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    664  1.10    mrg </p>
    665  1.14    mrg <div class="smallexample">
    666  1.14    mrg <pre class="smallexample">% LDR_CNTRL=MAXDATA=0x50000000
    667  1.10    mrg % export LDR_CNTRL
    668  1.10    mrg </pre></div>
    669   1.1    mrg 
    670  1.10    mrg <p>One can start with a pre-compiled version of GCC to build from
    671  1.10    mrg sources.  One may delete GCC&rsquo;s &ldquo;fixed&rdquo; header files when starting
    672   1.1    mrg with a version of GCC built for an earlier release of AIX.
    673  1.10    mrg </p>
    674  1.10    mrg <p>To speed up the configuration phases of bootstrapping and installing GCC,
    675  1.10    mrg one may use GNU Bash instead of AIX <code>/bin/sh</code>, e.g.,
    676  1.10    mrg </p>
    677  1.14    mrg <div class="smallexample">
    678  1.14    mrg <pre class="smallexample">% CONFIG_SHELL=/opt/freeware/bin/bash
    679  1.10    mrg % export CONFIG_SHELL
    680  1.10    mrg </pre></div>
    681   1.1    mrg 
    682  1.10    mrg <p>and then proceed as described in <a href="build.html">the build
    683  1.10    mrg instructions</a>, where we strongly recommend specifying an absolute path
    684   1.1    mrg to invoke <var>srcdir</var>/configure.
    685  1.10    mrg </p>
    686  1.10    mrg <p>Because GCC on AIX is built as a 32-bit executable by default,
    687   1.1    mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    688   1.1    mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    689   1.1    mrg as static archive libraries works better than shared libraries.
    690  1.10    mrg </p>
    691  1.10    mrg <p>Errors involving <code>alloca</code> when building GCC generally are due
    692   1.1    mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    693   1.1    mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    694  1.10    mrg the build, the native AIX compiler <strong>must</strong> be invoked as <code>cc</code>
    695  1.10    mrg (not <code>xlc</code>).  Once <code>configure</code> has been informed of
    696  1.10    mrg <code>xlc</code>, one needs to use &lsquo;<samp>make distclean</samp>&rsquo; to remove the
    697  1.10    mrg configure cache files and ensure that <code>CC</code> environment variable
    698  1.10    mrg does not provide a definition that will confuse <code>configure</code>.
    699   1.1    mrg If this error occurs during stage2 or later, then the problem most likely
    700   1.1    mrg is the version of Make (see above).
    701  1.10    mrg </p>
    702  1.10    mrg <p>The native <code>as</code> and <code>ld</code> are recommended for
    703   1.3  skrll bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    704   1.3  skrll Binutils version 2.20 is the minimum level that supports bootstrap on
    705  1.10    mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6&nbsp;or
    706   1.3  skrll AIX 7.  The native AIX tools do interoperate with GCC.
    707  1.10    mrg </p>
    708  1.10    mrg <p>AIX 7.1 added partial support for DWARF debugging, but full support
    709   1.7    mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    710   1.7    mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    711   1.7    mrg of libm.a missing important symbols; a fix for IV77796 will be
    712   1.7    mrg included in SP6.
    713  1.10    mrg </p>
    714  1.10    mrg <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    715   1.3  skrll assembler change that sometimes produces corrupt assembly files
    716   1.3  skrll causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    717   1.3  skrll can cause compilation failures with existing GCC installations.  An
    718   1.3  skrll AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    719   1.3  skrll IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    720   1.3  skrll AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    721   1.3  skrll AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    722  1.10    mrg </p>
    723  1.10    mrg <p>Building <samp>libstdc++.a</samp> requires a fix for an AIX Assembler bug
    724   1.1    mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    725   1.1    mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    726   1.1    mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    727  1.10    mrg </p>
    728  1.14    mrg <a name="TransferAixShobj"></a><p>&lsquo;<samp>libstdc++</samp>&rsquo; in GCC 3.4 increments the major version number of the
    729  1.10    mrg shared object and GCC installation places the <samp>libstdc++.a</samp>
    730   1.1    mrg shared library in a common location which will overwrite the and GCC
    731   1.1    mrg 3.3 version of the shared library.  Applications either need to be
    732   1.1    mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    733  1.10    mrg versions of the &lsquo;<samp>libstdc++</samp>&rsquo; shared object needs to be available
    734  1.10    mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp>libstdc++.so.4</samp>&rsquo;, if
    735  1.10    mrg present, and GCC 3.3 &lsquo;<samp>libstdc++.so.5</samp>&rsquo; shared objects can be
    736   1.1    mrg installed for runtime dynamic loading using the following steps to set
    737  1.10    mrg the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag in the shared object for <em>each</em>
    738  1.10    mrg multilib <samp>libstdc++.a</samp> installed:
    739  1.10    mrg </p>
    740  1.10    mrg <p>Extract the shared objects from the currently installed
    741  1.10    mrg <samp>libstdc++.a</samp> archive:
    742  1.14    mrg </p><div class="smallexample">
    743  1.14    mrg <pre class="smallexample">% ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    744  1.10    mrg </pre></div>
    745   1.1    mrg 
    746  1.10    mrg <p>Enable the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag so that the shared object will be
    747   1.1    mrg available for runtime dynamic loading, but not linking:
    748  1.14    mrg </p><div class="smallexample">
    749  1.14    mrg <pre class="smallexample">% strip -e libstdc++.so.4 libstdc++.so.5
    750  1.10    mrg </pre></div>
    751  1.10    mrg 
    752  1.10    mrg <p>Archive the runtime-only shared object in the GCC 3.4
    753  1.10    mrg <samp>libstdc++.a</samp> archive:
    754  1.14    mrg </p><div class="smallexample">
    755  1.14    mrg <pre class="smallexample">% ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    756  1.10    mrg </pre></div>
    757  1.10    mrg 
    758  1.10    mrg <p>Eventually, the
    759  1.10    mrg <a href="./configure.html#WithAixSoname"><samp>--with-aix-soname=svr4</samp></a>
    760   1.5    mrg configure option may drop the need for this procedure for libraries that
    761   1.5    mrg support it.
    762  1.10    mrg </p>
    763  1.10    mrg <p>Linking executables and shared libraries may produce warnings of
    764   1.1    mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    765   1.1    mrg have included multiple symbol definitions for certain global variable
    766   1.1    mrg and function declarations in the original program.  The warnings should
    767   1.1    mrg not prevent the linker from producing a correct library or runnable
    768   1.1    mrg executable.
    769  1.10    mrg </p>
    770  1.10    mrg <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    771   1.1    mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    772  1.10    mrg to parse archive libraries did not handle the new format correctly.
    773   1.1    mrg These routines are used by GCC and result in error messages during
    774   1.1    mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    775  1.10    mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp>-g</samp>
    776   1.1    mrg option of the archive command may be used to create archives of 32-bit
    777   1.1    mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    778   1.1    mrg routines is shipped with AIX 4.3.2 and above.
    779  1.10    mrg </p>
    780  1.10    mrg <p>Some versions of the AIX binder (linker) can fail with a relocation
    781  1.10    mrg overflow severe error when the <samp>-bbigtoc</samp> option is used to link
    782   1.1    mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    783   1.1    mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    784   1.1    mrg available from IBM Customer Support and from its
    785  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    786   1.1    mrg website as PTF U455193.
    787  1.10    mrg </p>
    788  1.10    mrg <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    789   1.1    mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    790   1.1    mrg APAR IX87327 is available from IBM Customer Support and from its
    791  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    792   1.1    mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    793  1.10    mrg </p>
    794  1.10    mrg <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    795   1.1    mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    796   1.1    mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    797  1.15    mrg <a href="https://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    798   1.1    mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    799  1.10    mrg </p>
    800  1.10    mrg <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    801   1.1    mrg use NLS to support locale-specific representations of various data
    802  1.10    mrg formats including floating-point numbers (e.g., &lsquo;<samp>.</samp>&rsquo;  vs &lsquo;<samp>,</samp>&rsquo; for
    803   1.1    mrg separating decimal fractions).  There have been problems reported where
    804   1.1    mrg GCC does not produce the same floating-point formats that the assembler
    805  1.10    mrg expects.  If one encounters this problem, set the <code>LANG</code>
    806  1.10    mrg environment variable to &lsquo;<samp>C</samp>&rsquo; or &lsquo;<samp>En_US</samp>&rsquo;.
    807  1.10    mrg </p>
    808  1.10    mrg <p>A default can be specified with the <samp>-mcpu=<var>cpu_type</var></samp>
    809  1.10    mrg switch and using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    810  1.10    mrg </p>
    811  1.10    mrg <hr />
    812  1.14    mrg <a name="iq2000-x-elf"></a><a name="iq2000-*-elf"></a>
    813  1.14    mrg <h3 class="heading">iq2000-*-elf</h3>
    814   1.1    mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    815   1.1    mrg applications.  There are no standard Unix configurations.
    816  1.10    mrg </p>
    817  1.10    mrg <hr />
    818  1.14    mrg <a name="lm32-x-elf"></a><a name="lm32-*-elf"></a>
    819  1.14    mrg <h3 class="heading">lm32-*-elf</h3>
    820  1.10    mrg <p>Lattice Mico32 processor.
    821   1.1    mrg This configuration is intended for embedded systems.
    822  1.10    mrg </p>
    823  1.10    mrg <hr />
    824  1.14    mrg <a name="lm32-x-uclinux"></a><a name="lm32-*-uclinux"></a>
    825  1.14    mrg <h3 class="heading">lm32-*-uclinux</h3>
    826  1.10    mrg <p>Lattice Mico32 processor.
    827   1.1    mrg This configuration is intended for embedded systems running uClinux.
    828  1.10    mrg </p>
    829  1.10    mrg <hr />
    830  1.15    mrg <a name="loongarch"></a><a name="LoongArch"></a>
    831  1.15    mrg <h3 class="heading">LoongArch</h3>
    832  1.15    mrg <p>LoongArch processor.
    833  1.15    mrg The following LoongArch targets are available:
    834  1.15    mrg </p><dl compact="compact">
    835  1.15    mrg <dt><code>loongarch64-linux-gnu*</code></dt>
    836  1.15    mrg <dd><p>LoongArch processor running GNU/Linux.  This target triplet may be coupled
    837  1.15    mrg with a small set of possible suffixes to identify their default ABI type:
    838  1.15    mrg </p><dl compact="compact">
    839  1.15    mrg <dt><code>f64</code></dt>
    840  1.15    mrg <dd><p>Uses <code>lp64d/base</code> ABI by default.
    841  1.15    mrg </p></dd>
    842  1.15    mrg <dt><code>f32</code></dt>
    843  1.15    mrg <dd><p>Uses <code>lp64f/base</code> ABI by default.
    844  1.15    mrg </p></dd>
    845  1.15    mrg <dt><code>sf</code></dt>
    846  1.15    mrg <dd><p>Uses <code>lp64s/base</code> ABI by default.
    847  1.15    mrg </p></dd>
    848  1.15    mrg </dl>
    849  1.15    mrg 
    850  1.15    mrg </dd>
    851  1.15    mrg <dt><code>loongarch64-linux-gnu</code></dt>
    852  1.15    mrg <dd><p>Same as <code>loongarch64-linux-gnuf64</code>, but may be used with
    853  1.15    mrg <samp>--with-abi=*</samp> to configure the default ABI type.
    854  1.15    mrg </p></dd>
    855  1.15    mrg </dl>
    856  1.15    mrg 
    857  1.15    mrg <p>More information about LoongArch can be found at
    858  1.15    mrg <a href="https://github.com/loongson/LoongArch-Documentation">https://github.com/loongson/LoongArch-Documentation</a>.
    859  1.15    mrg </p>
    860  1.15    mrg <hr />
    861  1.14    mrg <a name="m32c-x-elf"></a><a name="m32c-*-elf"></a>
    862  1.14    mrg <h3 class="heading">m32c-*-elf</h3>
    863  1.10    mrg <p>Renesas M32C processor.
    864   1.1    mrg This configuration is intended for embedded systems.
    865  1.10    mrg </p>
    866  1.10    mrg <hr />
    867  1.14    mrg <a name="m32r-x-elf"></a><a name="m32r-*-elf"></a>
    868  1.14    mrg <h3 class="heading">m32r-*-elf</h3>
    869  1.10    mrg <p>Renesas M32R processor.
    870   1.1    mrg This configuration is intended for embedded systems.
    871  1.10    mrg </p>
    872  1.10    mrg <hr />
    873  1.14    mrg <a name="m68k-x-x"></a><a name="m68k-*-*"></a>
    874  1.14    mrg <h3 class="heading">m68k-*-*</h3>
    875   1.1    mrg <p>By default,
    876  1.10    mrg &lsquo;<samp>m68k-*-elf*</samp>&rsquo;, &lsquo;<samp>m68k-*-rtems</samp>&rsquo;,  &lsquo;<samp>m68k-*-uclinux</samp>&rsquo; and
    877  1.10    mrg &lsquo;<samp>m68k-*-linux</samp>&rsquo;
    878   1.1    mrg build libraries for both M680x0 and ColdFire processors.  If you only
    879   1.1    mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    880  1.10    mrg <samp>--with-arch=m68k</samp> to <code>configure</code>.  Alternatively, you
    881  1.10    mrg can omit the M680x0 libraries by passing <samp>--with-arch=cf</samp> to
    882  1.10    mrg <code>configure</code>.  These targets default to 5206 or 5475 code as
    883   1.1    mrg appropriate for the target system when
    884  1.10    mrg configured with <samp>--with-arch=cf</samp> and 68020 code otherwise.
    885  1.10    mrg </p>
    886  1.10    mrg <p>The &lsquo;<samp>m68k-*-netbsd</samp>&rsquo; and
    887  1.10    mrg &lsquo;<samp>m68k-*-openbsd</samp>&rsquo; targets also support the <samp>--with-arch</samp>
    888   1.1    mrg option.  They will generate ColdFire CFV4e code when configured with
    889  1.10    mrg <samp>--with-arch=cf</samp> and 68020 code otherwise.
    890  1.10    mrg </p>
    891  1.10    mrg <p>You can override the default processors listed above by configuring
    892  1.10    mrg with <samp>--with-cpu=<var>target</var></samp>.  This <var>target</var> can either
    893  1.10    mrg be a <samp>-mcpu</samp> argument or one of the following values:
    894  1.10    mrg &lsquo;<samp>m68000</samp>&rsquo;, &lsquo;<samp>m68010</samp>&rsquo;, &lsquo;<samp>m68020</samp>&rsquo;, &lsquo;<samp>m68030</samp>&rsquo;,
    895  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;.
    896  1.10    mrg </p>
    897  1.10    mrg <p>GCC requires at least binutils version 2.17 on these targets.
    898  1.10    mrg </p>
    899  1.10    mrg <hr />
    900  1.14    mrg <a name="m68k-x-uclinux"></a><a name="m68k-*-uclinux"></a>
    901  1.14    mrg <h3 class="heading">m68k-*-uclinux</h3>
    902   1.1    mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    903  1.10    mrg &lsquo;<samp>m68k-linux-gnu</samp>&rsquo; ABI rather than the &lsquo;<samp>m68k-elf</samp>&rsquo; ABI.
    904   1.1    mrg It also added improved support for C++ and flat shared libraries,
    905   1.3  skrll both of which were ABI changes.
    906  1.10    mrg </p>
    907  1.10    mrg <hr />
    908  1.14    mrg <a name="microblaze-x-elf"></a><a name="microblaze-*-elf"></a>
    909  1.14    mrg <h3 class="heading">microblaze-*-elf</h3>
    910  1.10    mrg <p>Xilinx MicroBlaze processor.
    911   1.1    mrg This configuration is intended for embedded systems.
    912  1.10    mrg </p>
    913  1.10    mrg <hr />
    914  1.14    mrg <a name="mips-x-x"></a><a name="mips-*-*"></a>
    915  1.14    mrg <h3 class="heading">mips-*-*</h3>
    916   1.1    mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    917  1.10    mrg sections for all it&rsquo;s [sic] sectons [sic]&rdquo;, don&rsquo;t worry about it.  This
    918   1.1    mrg happens whenever you use GAS with the MIPS linker, but there is not
    919   1.1    mrg really anything wrong, and it is okay to use the output file.  You can
    920   1.1    mrg stop such warnings by installing the GNU linker.
    921  1.10    mrg </p>
    922  1.10    mrg <p>It would be nice to extend GAS to produce the gp tables, but they are
    923   1.1    mrg optional, and there should not be a warning about their absence.
    924  1.10    mrg </p>
    925  1.10    mrg <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    926   1.1    mrg and later.  A patch went in just after the GCC 3.3 release to
    927  1.10    mrg make &lsquo;<samp>mips*-*-*</samp>&rsquo; use the generic implementation instead.  You can also
    928  1.10    mrg configure for &lsquo;<samp>mipsel-elf</samp>&rsquo; as a workaround.  The
    929  1.10    mrg &lsquo;<samp>mips*-*-linux*</samp>&rsquo; target continues to use the MIPS II routines.  More
    930   1.1    mrg work on this is expected in future releases.
    931  1.10    mrg </p>
    932   1.1    mrg 
    933  1.10    mrg <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    934  1.10    mrg later systems and others that support the &lsquo;<samp>ll</samp>&rsquo;, &lsquo;<samp>sc</samp>&rsquo; and
    935  1.10    mrg &lsquo;<samp>sync</samp>&rsquo; instructions.  This can be overridden by passing
    936  1.10    mrg <samp>--with-llsc</samp> or <samp>--without-llsc</samp> when configuring GCC.
    937   1.1    mrg Since the Linux kernel emulates these instructions if they are
    938  1.10    mrg missing, the default for &lsquo;<samp>mips*-*-linux*</samp>&rsquo; targets is
    939  1.10    mrg <samp>--with-llsc</samp>.  The <samp>--with-llsc</samp> and
    940  1.10    mrg <samp>--without-llsc</samp> configure options may be overridden at compile
    941  1.10    mrg time by passing the <samp>-mllsc</samp> or <samp>-mno-llsc</samp> options to
    942   1.1    mrg the compiler.
    943  1.10    mrg </p>
    944  1.10    mrg <p>MIPS systems check for division by zero (unless
    945  1.10    mrg <samp>-mno-check-zero-division</samp> is passed to the compiler) by
    946   1.1    mrg generating either a conditional trap or a break instruction.  Using
    947   1.1    mrg trap results in smaller code, but is only supported on MIPS II and
    948   1.1    mrg later.  Also, some versions of the Linux kernel have a bug that
    949   1.1    mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    950  1.10    mrg the use of break, use the <samp>--with-divide=breaks</samp>
    951  1.10    mrg <code>configure</code> option when configuring GCC.  The default is to
    952   1.1    mrg use traps on systems that support them.
    953  1.10    mrg </p>
    954  1.10    mrg <hr />
    955  1.14    mrg <a name="moxie-x-elf"></a><a name="moxie-*-elf"></a>
    956  1.14    mrg <h3 class="heading">moxie-*-elf</h3>
    957   1.3  skrll <p>The moxie processor.
    958  1.10    mrg </p>
    959  1.10    mrg <hr />
    960  1.14    mrg <a name="msp430-x-elf"></a><a name="msp430-*-elf*"></a>
    961  1.14    mrg <h3 class="heading">msp430-*-elf*</h3>
    962  1.10    mrg <p>TI MSP430 processor.
    963   1.5    mrg This configuration is intended for embedded systems.
    964  1.10    mrg </p>
    965  1.12    mrg <p>&lsquo;<samp>msp430-*-elf</samp>&rsquo; is the standard configuration with most GCC
    966  1.12    mrg features enabled by default.
    967  1.12    mrg </p>
    968  1.12    mrg <p>&lsquo;<samp>msp430-*-elfbare</samp>&rsquo; is tuned for a bare-metal environment, and disables
    969  1.12    mrg features related to shared libraries and other functionality not used for
    970  1.12    mrg this device.  This reduces code and data usage of the GCC libraries, resulting
    971  1.12    mrg in a minimal run-time environment by default.
    972  1.12    mrg </p>
    973  1.12    mrg <p>Features disabled by default include:
    974  1.12    mrg </p><ul>
    975  1.12    mrg <li> transactional memory
    976  1.12    mrg </li><li> __cxa_atexit
    977  1.12    mrg </li></ul>
    978  1.12    mrg 
    979  1.10    mrg <hr />
    980  1.14    mrg <a name="nds32le-x-elf"></a><a name="nds32le-*-elf"></a>
    981  1.14    mrg <h3 class="heading">nds32le-*-elf</h3>
    982   1.5    mrg <p>Andes NDS32 target in little endian mode.
    983  1.10    mrg </p>
    984  1.10    mrg <hr />
    985  1.14    mrg <a name="nds32be-x-elf"></a><a name="nds32be-*-elf"></a>
    986  1.14    mrg <h3 class="heading">nds32be-*-elf</h3>
    987   1.5    mrg <p>Andes NDS32 target in big endian mode.
    988  1.10    mrg </p>
    989  1.10    mrg <hr />
    990  1.14    mrg <a name="nvptx-x-none"></a><a name="nvptx-*-none"></a>
    991  1.14    mrg <h3 class="heading">nvptx-*-none</h3>
    992   1.5    mrg <p>Nvidia PTX target.
    993  1.10    mrg </p>
    994  1.10    mrg <p>Instead of GNU binutils, you will need to install
    995  1.10    mrg <a href="https://github.com/MentorEmbedded/nvptx-tools/">nvptx-tools</a>.
    996   1.5    mrg Tell GCC where to find it:
    997  1.10    mrg <samp>--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</samp>.
    998  1.10    mrg </p>
    999  1.15    mrg <p>You will need newlib 3.1.0 or later.  It can be
   1000  1.10    mrg automatically built together with GCC.  For this, add a symbolic link
   1001  1.10    mrg to nvptx-newlib&rsquo;s <samp>newlib</samp> directory to the directory containing
   1002  1.10    mrg the GCC sources.
   1003  1.10    mrg </p>
   1004  1.10    mrg <p>Use the <samp>--disable-sjlj-exceptions</samp> and
   1005  1.10    mrg <samp>--enable-newlib-io-long-long</samp> options when configuring.
   1006  1.10    mrg </p>
   1007  1.10    mrg <hr />
   1008  1.14    mrg <a name="or1k-x-elf"></a><a name="or1k-*-elf"></a>
   1009  1.14    mrg <h3 class="heading">or1k-*-elf</h3>
   1010  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
   1011  1.11    mrg This configuration is intended for embedded systems.
   1012  1.11    mrg </p>
   1013  1.11    mrg <hr />
   1014  1.14    mrg <a name="or1k-x-linux"></a><a name="or1k-*-linux"></a>
   1015  1.14    mrg <h3 class="heading">or1k-*-linux</h3>
   1016  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
   1017  1.11    mrg </p>
   1018  1.11    mrg <hr />
   1019  1.14    mrg <a name="powerpc-x-x"></a><a name="powerpc-*-*"></a>
   1020  1.14    mrg <h3 class="heading">powerpc-*-*</h3>
   1021  1.10    mrg <p>You can specify a default version for the <samp>-mcpu=<var>cpu_type</var></samp>
   1022  1.10    mrg switch by using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
   1023  1.10    mrg </p>
   1024  1.12    mrg <p>You will need GNU binutils 2.20 or newer.
   1025  1.10    mrg </p>
   1026  1.10    mrg <hr />
   1027  1.14    mrg <a name="powerpc-x-darwin"></a><a name="powerpc-*-darwin*"></a>
   1028  1.14    mrg <h3 class="heading">powerpc-*-darwin*</h3>
   1029   1.1    mrg <p>PowerPC running Darwin (Mac OS X kernel).
   1030  1.10    mrg </p>
   1031  1.10    mrg <p>Pre-installed versions of Mac OS X may not include any developer tools,
   1032   1.1    mrg meaning that you will not be able to build GCC from source.  Tool
   1033   1.1    mrg binaries are available at
   1034   1.9    mrg <a href="https://opensource.apple.com">https://opensource.apple.com</a>.
   1035  1.10    mrg </p>
   1036  1.10    mrg <p>This version of GCC requires at least cctools-590.36.  The
   1037   1.1    mrg cctools-590.36 package referenced from
   1038  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
   1039   1.1    mrg on systems older than 10.3.9 (aka darwin7.9.0).
   1040  1.10    mrg </p>
   1041  1.10    mrg <hr />
   1042  1.14    mrg <a name="powerpc-x-elf"></a><a name="powerpc-*-elf"></a>
   1043  1.14    mrg <h3 class="heading">powerpc-*-elf</h3>
   1044   1.1    mrg <p>PowerPC system in big endian mode, running System V.4.
   1045  1.10    mrg </p>
   1046  1.10    mrg <hr />
   1047  1.14    mrg <a name="powerpc-x-linux-gnu"></a><a name="powerpc*-*-linux-gnu*"></a>
   1048  1.14    mrg <h3 class="heading">powerpc*-*-linux-gnu*</h3>
   1049   1.1    mrg <p>PowerPC system in big endian mode running Linux.
   1050  1.10    mrg </p>
   1051  1.10    mrg <hr />
   1052  1.14    mrg <a name="powerpc-x-netbsd"></a><a name="powerpc-*-netbsd*"></a>
   1053  1.14    mrg <h3 class="heading">powerpc-*-netbsd*</h3>
   1054   1.1    mrg <p>PowerPC system in big endian mode running NetBSD.
   1055  1.10    mrg </p>
   1056  1.10    mrg <hr />
   1057  1.14    mrg <a name="powerpc-x-eabisim"></a><a name="powerpc-*-eabisim"></a>
   1058  1.14    mrg <h3 class="heading">powerpc-*-eabisim</h3>
   1059   1.1    mrg <p>Embedded PowerPC system in big endian mode for use in running under the
   1060   1.1    mrg PSIM simulator.
   1061  1.10    mrg </p>
   1062  1.10    mrg <hr />
   1063  1.14    mrg <a name="powerpc-x-eabi"></a><a name="powerpc-*-eabi"></a>
   1064  1.14    mrg <h3 class="heading">powerpc-*-eabi</h3>
   1065   1.1    mrg <p>Embedded PowerPC system in big endian mode.
   1066  1.10    mrg </p>
   1067  1.10    mrg <hr />
   1068  1.14    mrg <a name="powerpcle-x-elf"></a><a name="powerpcle-*-elf"></a>
   1069  1.14    mrg <h3 class="heading">powerpcle-*-elf</h3>
   1070   1.1    mrg <p>PowerPC system in little endian mode, running System V.4.
   1071  1.10    mrg </p>
   1072  1.10    mrg <hr />
   1073  1.14    mrg <a name="powerpcle-x-eabisim"></a><a name="powerpcle-*-eabisim"></a>
   1074  1.14    mrg <h3 class="heading">powerpcle-*-eabisim</h3>
   1075   1.1    mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1076   1.1    mrg the PSIM simulator.
   1077  1.10    mrg </p>
   1078  1.10    mrg <hr />
   1079  1.14    mrg <a name="powerpcle-x-eabi"></a><a name="powerpcle-*-eabi"></a>
   1080  1.14    mrg <h3 class="heading">powerpcle-*-eabi</h3>
   1081   1.1    mrg <p>Embedded PowerPC system in little endian mode.
   1082  1.10    mrg </p>
   1083  1.10    mrg <hr />
   1084  1.14    mrg <a name="rl78-x-elf"></a><a name="rl78-*-elf"></a>
   1085  1.14    mrg <h3 class="heading">rl78-*-elf</h3>
   1086  1.10    mrg <p>The Renesas RL78 processor.
   1087  1.10    mrg This configuration is intended for embedded systems.
   1088  1.10    mrg </p>
   1089  1.10    mrg <hr />
   1090  1.14    mrg <a name="riscv32-x-elf"></a><a name="riscv32-*-elf"></a>
   1091  1.14    mrg <h3 class="heading">riscv32-*-elf</h3>
   1092  1.10    mrg <p>The RISC-V RV32 instruction set.
   1093   1.3  skrll This configuration is intended for embedded systems.
   1094  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1095  1.10    mrg </p>
   1096  1.10    mrg <hr />
   1097  1.14    mrg <a name="riscv32-x-linux"></a><a name="riscv32-*-linux"></a>
   1098  1.14    mrg <h3 class="heading">riscv32-*-linux</h3>
   1099  1.10    mrg <p>The RISC-V RV32 instruction set running GNU/Linux.
   1100  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1101  1.10    mrg </p>
   1102  1.10    mrg <hr />
   1103  1.14    mrg <a name="riscv64-x-elf"></a><a name="riscv64-*-elf"></a>
   1104  1.14    mrg <h3 class="heading">riscv64-*-elf</h3>
   1105  1.10    mrg <p>The RISC-V RV64 instruction set.
   1106  1.10    mrg This configuration is intended for embedded systems.
   1107  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1108  1.10    mrg </p>
   1109  1.10    mrg <hr />
   1110  1.14    mrg <a name="riscv64-x-linux"></a><a name="riscv64-*-linux"></a>
   1111  1.14    mrg <h3 class="heading">riscv64-*-linux</h3>
   1112  1.10    mrg <p>The RISC-V RV64 instruction set running GNU/Linux.
   1113  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1114  1.10    mrg </p>
   1115  1.10    mrg <hr />
   1116  1.14    mrg <a name="rx-x-elf"></a><a name="rx-*-elf"></a>
   1117  1.14    mrg <h3 class="heading">rx-*-elf</h3>
   1118   1.9    mrg <p>The Renesas RX processor.
   1119  1.10    mrg </p>
   1120  1.10    mrg <hr />
   1121  1.14    mrg <a name="s390-x-linux"></a><a name="s390-*-linux*"></a>
   1122  1.14    mrg <h3 class="heading">s390-*-linux*</h3>
   1123   1.1    mrg <p>S/390 system running GNU/Linux for S/390.
   1124  1.10    mrg </p>
   1125  1.10    mrg <hr />
   1126  1.14    mrg <a name="s390x-x-linux"></a><a name="s390x-*-linux*"></a>
   1127  1.14    mrg <h3 class="heading">s390x-*-linux*</h3>
   1128   1.1    mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1129  1.10    mrg </p>
   1130  1.10    mrg <hr />
   1131  1.14    mrg <a name="s390x-ibm-tpf"></a><a name="s390x-ibm-tpf*"></a>
   1132  1.14    mrg <h3 class="heading">s390x-ibm-tpf*</h3>
   1133   1.1    mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1134   1.1    mrg supported as cross-compilation target only.
   1135  1.10    mrg </p>
   1136  1.10    mrg <hr />
   1137  1.14    mrg <a name="x-x-solaris2"></a><a name="g_t*-*-solaris2*"></a>
   1138  1.14    mrg <h3 class="heading">*-*-solaris2*</h3>
   1139  1.12    mrg <p>Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
   1140  1.12    mrg 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
   1141  1.12    mrg GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
   1142  1.12    mrg </p>
   1143  1.12    mrg <p>Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1144  1.12    mrg <code>/usr/gcc/4.5/bin/gcc</code> or similar.  Newer Solaris versions
   1145  1.12    mrg provide one or more of GCC 5, 7, and 9.  Alternatively,
   1146   1.1    mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1147   1.1    mrg <a href="binaries.html">binaries page</a> for details.
   1148  1.10    mrg </p>
   1149  1.10    mrg <p>The Solaris 2 <code>/bin/sh</code> will often fail to configure
   1150  1.12    mrg &lsquo;<samp>libstdc++-v3</samp>&rsquo;.  We therefore recommend using the
   1151   1.9    mrg following initial sequence of commands
   1152  1.10    mrg </p>
   1153  1.14    mrg <div class="smallexample">
   1154  1.14    mrg <pre class="smallexample">% CONFIG_SHELL=/bin/ksh
   1155  1.10    mrg % export CONFIG_SHELL
   1156  1.10    mrg </pre></div>
   1157   1.9    mrg 
   1158  1.10    mrg <p>and proceed as described in <a href="configure.html">the configure instructions</a>.
   1159   1.1    mrg In addition we strongly recommend specifying an absolute path to invoke
   1160  1.10    mrg <code><var>srcdir</var>/configure</code>.
   1161  1.10    mrg </p>
   1162  1.12    mrg <p>In Solaris 11, you need to check for <code>system/header</code>,
   1163  1.12    mrg <code>system/linker</code>, and <code>developer/assembler</code> packages.
   1164  1.10    mrg </p>
   1165  1.10    mrg <p>Trying to use the linker and other tools in
   1166  1.10    mrg <samp>/usr/ucb</samp> to install GCC has been observed to cause trouble.
   1167   1.1    mrg For example, the linker may hang indefinitely.  The fix is to remove
   1168  1.10    mrg <samp>/usr/ucb</samp> from your <code>PATH</code>.
   1169  1.10    mrg </p>
   1170  1.12    mrg <p>The build process works more smoothly with the legacy Solaris tools so, if you
   1171  1.10    mrg have <samp>/usr/xpg4/bin</samp> in your <code>PATH</code>, we recommend that you place
   1172  1.10    mrg <samp>/usr/bin</samp> before <samp>/usr/xpg4/bin</samp> for the duration of the build.
   1173  1.10    mrg </p>
   1174  1.10    mrg <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1175  1.10    mrg conjunction with the Solaris linker.  The GNU <code>as</code>
   1176  1.12    mrg versions included in Solaris 11.3,
   1177  1.12    mrg from GNU binutils 2.23.1 or newer (in <samp>/usr/bin/gas</samp> and
   1178  1.10    mrg <samp>/usr/gnu/bin/as</samp>), are known to work.
   1179  1.12    mrg The current version, from GNU binutils 2.34,
   1180  1.10    mrg is known to work as well.  Note that your mileage may vary
   1181   1.7    mrg if you use a combination of the GNU tools and the Solaris tools: while the
   1182  1.12    mrg combination GNU <code>as</code> + Solaris <code>ld</code> should reasonably work,
   1183  1.12    mrg the reverse combination Solaris <code>as</code> + GNU <code>ld</code> may fail to
   1184  1.10    mrg build or cause memory corruption at runtime in some cases for C++ programs.
   1185  1.12    mrg GNU <code>ld</code> usually works as well.  Again, the current
   1186  1.12    mrg version (2.34) is known to work, but generally lacks platform specific
   1187  1.10    mrg features, so better stay with Solaris <code>ld</code>.  To use the LTO linker
   1188  1.10    mrg plugin (<samp>-fuse-linker-plugin</samp>) with GNU <code>ld</code>, GNU
   1189  1.10    mrg binutils <em>must</em> be configured with <samp>--enable-largefile</samp>.
   1190  1.10    mrg </p>
   1191  1.10    mrg <p>To enable symbol versioning in &lsquo;<samp>libstdc++</samp>&rsquo; with the Solaris linker,
   1192  1.10    mrg you need to have any version of GNU <code>c++filt</code>, which is part of
   1193  1.10    mrg GNU binutils.  &lsquo;<samp>libstdc++</samp>&rsquo; symbol versioning will be disabled if no
   1194  1.10    mrg appropriate version is found.  Solaris <code>c++filt</code> from the Solaris
   1195   1.7    mrg Studio compilers does <em>not</em> work.
   1196  1.10    mrg </p>
   1197  1.15    mrg <p>In order to build the GNU D compiler, GDC, a working &lsquo;<samp>libphobos</samp>&rsquo; is
   1198  1.15    mrg needed.  That library wasn&rsquo;t built by default in GCC 9&ndash;11 on SPARC, or
   1199  1.15    mrg on x86 when the Solaris assembler is used, but can be enabled by
   1200  1.15    mrg configuring with <samp>--enable-libphobos</samp>.  Also, GDC 9.4.0 is
   1201  1.15    mrg required on x86, while GDC 9.3.0 is known to work on SPARC.
   1202  1.15    mrg </p>
   1203  1.12    mrg <p>The versions of the GNU Multiple Precision Library (GMP), the MPFR
   1204  1.12    mrg library and the MPC library bundled with Solaris 11.3 and later are
   1205  1.12    mrg usually recent enough to match GCC&rsquo;s requirements.  There are two
   1206  1.12    mrg caveats:
   1207  1.10    mrg </p>
   1208  1.12    mrg <ul>
   1209  1.12    mrg <li> While the version of the GMP library in Solaris 11.3 works with GCC, you
   1210  1.12    mrg need to configure with <samp>--with-gmp-include=/usr/include/gmp</samp>.
   1211  1.12    mrg 
   1212  1.12    mrg </li><li> The version of the MPFR libary included in Solaris 11.3 is too old; you
   1213  1.12    mrg need to provide a more recent one.
   1214  1.15    mrg 
   1215  1.12    mrg </li></ul>
   1216  1.12    mrg 
   1217  1.10    mrg <hr />
   1218  1.14    mrg <a name="sparc-x-x"></a><a name="sparc*-*-*"></a>
   1219  1.14    mrg <h3 class="heading">sparc*-*-*</h3>
   1220   1.3  skrll <p>This section contains general configuration information for all
   1221   1.3  skrll SPARC-based platforms.  In addition to reading this section, please
   1222   1.3  skrll read all other sections that match your target.
   1223  1.10    mrg </p>
   1224  1.10    mrg <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1225   1.3  skrll library and the MPC library are known to be miscompiled by earlier
   1226   1.3  skrll versions of GCC on these platforms.  We therefore recommend the use
   1227   1.3  skrll of the exact versions of these libraries listed as minimal versions
   1228   1.3  skrll in <a href="prerequisites.html">the prerequisites</a>.
   1229  1.10    mrg </p>
   1230  1.10    mrg <hr />
   1231  1.14    mrg <a name="sparc-sun-solaris2"></a><a name="sparc-sun-solaris2*"></a>
   1232  1.14    mrg <h3 class="heading">sparc-sun-solaris2*</h3>
   1233   1.1    mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1234  1.12    mrg produced are smaller than the ones produced using Solaris native tools;
   1235   1.1    mrg this difference is quite significant for binaries containing debugging
   1236   1.1    mrg information.
   1237  1.10    mrg </p>
   1238  1.10    mrg <p>Starting with Solaris 7, the operating system is capable of executing
   1239   1.1    mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1240  1.10    mrg this; the <samp>-m64</samp> option enables 64-bit code generation.
   1241   1.1    mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1242  1.10    mrg should try the <samp>-mtune=ultrasparc</samp> option instead, which produces
   1243   1.1    mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1244   1.1    mrg machines.
   1245  1.10    mrg </p>
   1246  1.10    mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1247   1.3  skrll library or the MPC library on a Solaris 7 or later system, the canonical
   1248  1.10    mrg target triplet must be specified as the <code>build</code> parameter on the
   1249  1.10    mrg configure line.  This target triplet can be obtained by invoking <code>./config.guess</code> in the toplevel source directory of GCC (and
   1250  1.12    mrg not that of GMP or MPFR or MPC).  For example on a Solaris 11 system:
   1251  1.10    mrg </p>
   1252  1.14    mrg <div class="smallexample">
   1253  1.14    mrg <pre class="smallexample">% ./configure --build=sparc-sun-solaris2.11 --prefix=xxx
   1254  1.10    mrg </pre></div>
   1255  1.10    mrg 
   1256  1.10    mrg <hr />
   1257  1.14    mrg <a name="sparc-x-linux"></a><a name="sparc-*-linux*"></a>
   1258  1.14    mrg <h3 class="heading">sparc-*-linux*</h3>
   1259  1.10    mrg 
   1260  1.10    mrg <hr />
   1261  1.14    mrg <a name="sparc64-x-solaris2"></a><a name="sparc64-*-solaris2*"></a>
   1262  1.14    mrg <h3 class="heading">sparc64-*-solaris2*</h3>
   1263  1.12    mrg <p>When configuring a 64-bit-default GCC on Solaris/SPARC, you must use a
   1264  1.12    mrg build compiler that generates 64-bit code, either by default or by
   1265  1.12    mrg specifying &lsquo;<samp>CC='gcc -m64' CXX='gcc-m64'</samp>&rsquo; to <code>configure</code>.
   1266  1.12    mrg Additionally, you <em>must</em> pass <samp>--build=sparc64-sun-solaris2.11</samp>
   1267  1.12    mrg or <samp>--build=sparcv9-sun-solaris2.11</samp> because <samp>config.guess</samp>
   1268  1.12    mrg misdetects this situation, which can cause build failures.
   1269  1.12    mrg </p>
   1270   1.3  skrll <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1271   1.3  skrll library or the MPC library, the canonical target triplet must be specified
   1272  1.10    mrg as the <code>build</code> parameter on the configure line.  For example
   1273  1.12    mrg on a Solaris 11 system:
   1274  1.10    mrg </p>
   1275  1.14    mrg <div class="smallexample">
   1276  1.14    mrg <pre class="smallexample">% ./configure --build=sparc64-sun-solaris2.11 --prefix=xxx
   1277  1.10    mrg </pre></div>
   1278  1.10    mrg 
   1279  1.10    mrg <hr />
   1280  1.14    mrg <a name="sparcv9-x-solaris2"></a><a name="sparcv9-*-solaris2*"></a>
   1281  1.14    mrg <h3 class="heading">sparcv9-*-solaris2*</h3>
   1282  1.10    mrg <p>This is a synonym for &lsquo;<samp>sparc64-*-solaris2*</samp>&rsquo;.
   1283  1.10    mrg </p>
   1284  1.10    mrg <hr />
   1285  1.14    mrg <a name="c6x-x-x"></a><a name="c6x-*-*"></a>
   1286  1.14    mrg <h3 class="heading">c6x-*-*</h3>
   1287   1.3  skrll <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1288  1.10    mrg </p>
   1289  1.10    mrg <hr />
   1290  1.14    mrg <a name="tilegx-*-linux"></a><a name="tilegx-*-linux*"></a>
   1291  1.14    mrg <h3 class="heading">tilegx-*-linux*</h3>
   1292   1.5    mrg <p>The TILE-Gx processor in little endian mode, running GNU/Linux.  This
   1293   1.5    mrg port requires binutils-2.22 or newer.
   1294  1.10    mrg </p>
   1295  1.10    mrg <hr />
   1296  1.14    mrg <a name="tilegxbe-*-linux"></a><a name="tilegxbe-*-linux*"></a>
   1297  1.14    mrg <h3 class="heading">tilegxbe-*-linux*</h3>
   1298   1.5    mrg <p>The TILE-Gx processor in big endian mode, running GNU/Linux.  This
   1299   1.5    mrg port requires binutils-2.23 or newer.
   1300  1.10    mrg </p>
   1301  1.10    mrg <hr />
   1302  1.14    mrg <a name="tilepro-*-linux"></a><a name="tilepro-*-linux*"></a>
   1303  1.14    mrg <h3 class="heading">tilepro-*-linux*</h3>
   1304   1.3  skrll <p>The TILEPro processor running GNU/Linux.  This port requires
   1305   1.3  skrll binutils-2.22 or newer.
   1306  1.10    mrg </p>
   1307  1.10    mrg <hr />
   1308  1.14    mrg <a name="visium-x-elf"></a><a name="visium-*-elf"></a>
   1309  1.14    mrg <h3 class="heading">visium-*-elf</h3>
   1310  1.10    mrg <p>CDS VISIUMcore processor.
   1311   1.5    mrg This configuration is intended for embedded systems.
   1312  1.10    mrg </p>
   1313  1.10    mrg <hr />
   1314  1.14    mrg <a name="x-x-vxworks"></a><a name="g_t*-*-vxworks*"></a>
   1315  1.14    mrg <h3 class="heading">*-*-vxworks*</h3>
   1316   1.1    mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1317  1.10    mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC.
   1318  1.10    mrg We welcome patches for other architectures supported by VxWorks 5.5.
   1319   1.1    mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1320   1.1    mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1321   1.1    mrg not interested in supporting older, a.out or COFF-based, versions of
   1322   1.1    mrg VxWorks in GCC 3.
   1323  1.10    mrg </p>
   1324  1.10    mrg <p>VxWorks comes with an older version of GCC installed in
   1325  1.10    mrg <samp><var>$WIND_BASE</var>/host</samp>; we recommend you do not overwrite it.
   1326  1.10    mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>.
   1327  1.10    mrg Before running <code>configure</code>, create the directories <samp><var>prefix</var></samp>
   1328  1.10    mrg and <samp><var>prefix</var>/bin</samp>.  Link or copy the appropriate assembler,
   1329  1.10    mrg linker, etc. into <samp><var>prefix</var>/bin</samp>, and set your <var>PATH</var> to
   1330  1.10    mrg include that directory while running both <code>configure</code> and
   1331  1.10    mrg <code>make</code>.
   1332  1.10    mrg </p>
   1333  1.10    mrg <p>You must give <code>configure</code> the
   1334  1.10    mrg <samp>--with-headers=<var>$WIND_BASE</var>/target/h</samp> switch so that it can
   1335   1.1    mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1336  1.10    mrg target only, you must also specify <samp>--target=<var>target</var></samp>.
   1337  1.10    mrg <code>configure</code> will attempt to create the directory
   1338  1.10    mrg <samp><var>prefix</var>/<var>target</var>/sys-include</samp> and copy files into it;
   1339  1.10    mrg make sure the user running <code>configure</code> has sufficient privilege
   1340   1.1    mrg to do so.
   1341  1.10    mrg </p>
   1342  1.10    mrg <p>GCC&rsquo;s exception handling runtime requires a special &ldquo;configlette&rdquo;
   1343  1.10    mrg module, <samp>contrib/gthr_supp_vxw_5x.c</samp>.  Follow the instructions in
   1344   1.1    mrg that file to add the module to your kernel build.  (Future versions of
   1345   1.1    mrg VxWorks will incorporate this module.)
   1346  1.10    mrg </p>
   1347  1.10    mrg <hr />
   1348  1.14    mrg <a name="x86-64-x-x"></a><a name="x86_005f64-*-*_002c-amd64-*-*"></a>
   1349  1.14    mrg <h3 class="heading">x86_64-*-*, amd64-*-*</h3>
   1350   1.1    mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1351  1.10    mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD.
   1352   1.1    mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1353  1.10    mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp>-m32</samp> switch).
   1354  1.10    mrg </p>
   1355  1.10    mrg <hr />
   1356  1.14    mrg <a name="x86-64-x-solaris2"></a><a name="x86_005f64-*-solaris2*"></a>
   1357  1.14    mrg <h3 class="heading">x86_64-*-solaris2*</h3>
   1358   1.3  skrll <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1359  1.10    mrg processor (&lsquo;<samp>amd64-*-*</samp>&rsquo; is an alias for &lsquo;<samp>x86_64-*-*</samp>&rsquo;) on
   1360   1.3  skrll Solaris 10 or later.  Unlike other systems, without special options a
   1361   1.3  skrll bi-arch compiler is built which generates 32-bit code by default, but
   1362  1.10    mrg can generate 64-bit x86-64 code with the <samp>-m64</samp> switch.  Since
   1363   1.7    mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1364  1.10    mrg can generate 32-bit code with <samp>-m32</samp>.  To configure and build
   1365  1.10    mrg this way, you have to provide all support libraries like <samp>libgmp</samp>
   1366  1.12    mrg as 64-bit code, configure with <samp>--target=x86_64-pc-solaris2.11</samp>
   1367  1.10    mrg and &lsquo;<samp>CC=gcc -m64</samp>&rsquo;.
   1368  1.10    mrg </p>
   1369  1.10    mrg <hr />
   1370  1.14    mrg <a name="xtensa-x-elf"></a><a name="xtensa*-*-elf"></a>
   1371  1.14    mrg <h3 class="heading">xtensa*-*-elf</h3>
   1372   1.1    mrg <p>This target is intended for embedded Xtensa systems using the
   1373  1.10    mrg &lsquo;<samp>newlib</samp>&rsquo; C library.  It uses ELF but does not support shared
   1374   1.1    mrg objects.  Designed-defined instructions specified via the
   1375   1.1    mrg Tensilica Instruction Extension (TIE) language are only supported
   1376   1.1    mrg through inline assembly.
   1377  1.10    mrg </p>
   1378  1.10    mrg <p>The Xtensa configuration information must be specified prior to
   1379  1.10    mrg building GCC.  The <samp>include/xtensa-config.h</samp> header
   1380   1.1    mrg file contains the configuration information.  If you created your
   1381   1.1    mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1382   1.1    mrg downloaded files include a customized copy of this header file,
   1383   1.1    mrg which you can use to replace the default header file.
   1384  1.10    mrg </p>
   1385  1.10    mrg <hr />
   1386  1.14    mrg <a name="xtensa-x-linux"></a><a name="xtensa*-*-linux*"></a>
   1387  1.14    mrg <h3 class="heading">xtensa*-*-linux*</h3>
   1388   1.1    mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1389   1.1    mrg shared objects and the GNU C library (glibc).  It also generates
   1390   1.1    mrg position-independent code (PIC) regardless of whether the
   1391  1.10    mrg <samp>-fpic</samp> or <samp>-fPIC</samp> options are used.  In other
   1392   1.1    mrg respects, this target is the same as the
   1393  1.10    mrg <a href="#xtensa*-*-elf">&lsquo;<samp>xtensa*-*-elf</samp>&rsquo;</a> target.
   1394  1.10    mrg </p>
   1395  1.10    mrg <hr />
   1396  1.14    mrg <a name="windows"></a><a name="Microsoft-Windows"></a>
   1397  1.14    mrg <h3 class="heading">Microsoft Windows</h3>
   1398   1.1    mrg 
   1399  1.14    mrg <a name="Intel-16-bit-versions"></a>
   1400  1.14    mrg <h4 class="subheading">Intel 16-bit versions</h4>
   1401   1.1    mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1402   1.1    mrg supported.
   1403  1.10    mrg </p>
   1404  1.10    mrg <p>However, the 32-bit port has limited support for Microsoft
   1405   1.1    mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1406  1.10    mrg </p>
   1407  1.14    mrg <a name="Intel-32-bit-versions"></a>
   1408  1.14    mrg <h4 class="subheading">Intel 32-bit versions</h4>
   1409   1.1    mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1410   1.1    mrg XP, and Windows Vista, are supported by several different target
   1411   1.1    mrg platforms.  These targets differ in which Windows subsystem they target
   1412   1.1    mrg and which C libraries are used.
   1413  1.10    mrg </p>
   1414  1.10    mrg <ul>
   1415  1.10    mrg <li> Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1416  1.10    mrg Linux API emulation layer in the Win32 subsystem.
   1417  1.10    mrg </li><li> MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1418  1.10    mrg the Win32 subsystem that provides a subset of POSIX.
   1419  1.10    mrg </li><li> MKS i386-pc-mks: NuTCracker from MKS.  See
   1420  1.10    mrg <a href="https://www.mkssoftware.com">https://www.mkssoftware.com</a> for more information.
   1421  1.10    mrg </li></ul>
   1422   1.1    mrg 
   1423  1.14    mrg <a name="Intel-64-bit-versions"></a>
   1424  1.14    mrg <h4 class="subheading">Intel 64-bit versions</h4>
   1425   1.1    mrg <p>GCC contains support for x86-64 using the mingw-w64
   1426  1.15    mrg runtime library, available from <a href="https://www.mingw-w64.org/downloads/">https://www.mingw-w64.org/downloads/</a>.
   1427   1.1    mrg This library should be used with the target triple x86_64-pc-mingw32.
   1428  1.10    mrg </p>
   1429  1.14    mrg <a name="Windows-CE"></a>
   1430  1.14    mrg <h4 class="subheading">Windows CE</h4>
   1431   1.3  skrll <p>Windows CE is supported as a target only on Hitachi
   1432   1.1    mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1433  1.10    mrg </p>
   1434  1.14    mrg <a name="Other-Windows-Platforms"></a>
   1435  1.14    mrg <h4 class="subheading">Other Windows Platforms</h4>
   1436   1.1    mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1437  1.10    mrg </p>
   1438  1.10    mrg <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1439   1.1    mrg support the Interix subsystem.  See above.
   1440  1.10    mrg </p>
   1441  1.10    mrg <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1442  1.10    mrg </p>
   1443  1.10    mrg <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1444   1.1    mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1445  1.10    mrg </p>
   1446  1.10    mrg <p>UWIN support has been removed due to a lack of maintenance.
   1447  1.10    mrg </p>
   1448  1.10    mrg <hr />
   1449  1.14    mrg <a name="x-x-cygwin"></a><a name="g_t*-*-cygwin"></a>
   1450  1.14    mrg <h3 class="heading">*-*-cygwin</h3>
   1451   1.1    mrg <p>Ports of GCC are included with the
   1452   1.1    mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1453  1.10    mrg </p>
   1454  1.10    mrg <p>GCC will build under Cygwin without modification; it does not build
   1455  1.10    mrg with Microsoft&rsquo;s C++ compiler and there are no plans to make it do so.
   1456  1.10    mrg </p>
   1457  1.10    mrg <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1458   1.1    mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1459   1.1    mrg used with as up-to-date a version of binutils as possible; use either
   1460   1.1    mrg the latest official GNU binutils release in the Cygwin distribution,
   1461   1.1    mrg or version 2.20 or above if building your own.
   1462  1.10    mrg </p>
   1463  1.10    mrg <hr />
   1464  1.14    mrg <a name="x-x-mingw32"></a><a name="g_t*-*-mingw32"></a>
   1465  1.14    mrg <h3 class="heading">*-*-mingw32</h3>
   1466  1.10    mrg <p>GCC will build with and support only MinGW runtime 3.12 and later.
   1467   1.1    mrg Earlier versions of headers are incompatible with the new default semantics
   1468   1.1    mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1469  1.10    mrg </p>
   1470  1.15    mrg <p>To support emitting DWARF debugging info you need to use GNU binutils
   1471  1.15    mrg version 2.16 or above containing support for the <code>.secrel32</code>
   1472  1.15    mrg assembler pseudo-op.
   1473  1.15    mrg </p>
   1474  1.10    mrg <hr />
   1475  1.14    mrg <a name="older"></a><a name="Older-systems"></a>
   1476  1.14    mrg <h3 class="heading">Older systems</h3>
   1477   1.1    mrg <p>GCC contains support files for many older (1980s and early
   1478   1.1    mrg 1990s) Unix variants.  For the most part, support for these systems
   1479   1.1    mrg has not been deliberately removed, but it has not been maintained for
   1480   1.1    mrg several years and may suffer from bitrot.
   1481  1.10    mrg </p>
   1482  1.10    mrg <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems.
   1483   1.1    mrg Support for these systems is still present in that release, but
   1484  1.10    mrg <code>configure</code> will fail unless the <samp>--enable-obsolete</samp>
   1485   1.1    mrg option is given.  Unless a maintainer steps forward, support for these
   1486   1.1    mrg systems will be removed from the next release of GCC.
   1487  1.10    mrg </p>
   1488  1.10    mrg <p>Support for old systems as hosts for GCC can cause problems if the
   1489   1.1    mrg workarounds for compiler, library and operating system bugs affect the
   1490   1.1    mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1491   1.1    mrg bring GCC up on such a system, if still possible with current GCC, may
   1492   1.1    mrg require first installing an old version of GCC which did work on that
   1493   1.1    mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1494   1.1    mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1495  1.10    mrg <samp>old-releases</samp> directory on the <a href="../mirrors.html">GCC mirror
   1496  1.10    mrg sites</a>.  Header bugs may generally be avoided using
   1497  1.10    mrg <code>fixincludes</code>, but bugs or deficiencies in libraries and the
   1498   1.1    mrg operating system may still cause problems.
   1499  1.10    mrg </p>
   1500  1.10    mrg <p>Support for older systems as targets for cross-compilation is less
   1501   1.1    mrg problematic than support for them as hosts for GCC; if an enthusiast
   1502   1.1    mrg wishes to make such a target work again (including resurrecting any of
   1503   1.1    mrg the targets that never worked with GCC 2, starting from the last
   1504   1.1    mrg version before they were removed), patches
   1505   1.1    mrg <a href="../contribute.html">following the usual requirements</a> would be
   1506   1.1    mrg likely to be accepted, since they should not affect the support for more
   1507   1.1    mrg modern targets.
   1508  1.10    mrg </p>
   1509  1.10    mrg <p>For some systems, old versions of GNU binutils may also be useful,
   1510  1.10    mrg and are available from <samp>pub/binutils/old-releases</samp> on
   1511   1.9    mrg <a href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1512  1.10    mrg </p>
   1513  1.10    mrg <p>Some of the information on specific systems above relates to
   1514   1.1    mrg such older systems, but much of the information
   1515   1.1    mrg about GCC on such systems (which may no longer be applicable to
   1516   1.1    mrg current GCC) is to be found in the GCC texinfo manual.
   1517  1.10    mrg </p>
   1518  1.10    mrg <hr />
   1519  1.14    mrg <a name="elf"></a><a name="all-ELF-targets-_0028SVR4_002c-Solaris-2_002c-etc_002e_0029"></a>
   1520  1.14    mrg <h3 class="heading">all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1521   1.1    mrg <p>C++ support is significantly better on ELF targets if you use the
   1522   1.1    mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1523   1.1    mrg inlines, vtables and template instantiations will be discarded
   1524   1.1    mrg automatically.
   1525  1.10    mrg </p>
   1526   1.1    mrg 
   1527  1.10    mrg <hr />
   1528  1.10    mrg <p>
   1529   1.1    mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1530  1.10    mrg </p>
   1531  1.10    mrg 
   1532  1.10    mrg 
   1533  1.10    mrg 
   1534  1.10    mrg 
   1535   1.1    mrg 
   1536  1.10    mrg </body>
   1537  1.10    mrg </html>
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