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     25  1.13  mrg <title>Host/Target specific installation notes for GCC</title>
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     57  1.11  mrg <body lang="en">
     58  1.13  mrg <h1 class="settitle" align="center">Host/Target specific installation notes for GCC</h1>
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     82   1.8  mrg 
     83  1.13  mrg <span id="index-Specific"></span>
     84  1.13  mrg <span id="index-Specific-installation-notes"></span>
     85  1.13  mrg <span id="index-Target-specific-installation"></span>
     86  1.13  mrg <span id="index-Host-specific-installation"></span>
     87  1.13  mrg <span id="index-Target-specific-installation-notes"></span>
     88   1.6  mrg 
     89  1.11  mrg <p>Please read this document carefully <em>before</em> installing the
     90  1.11  mrg GNU Compiler Collection on your machine.
     91  1.11  mrg </p>
     92  1.11  mrg <p>Note that this list of install notes is <em>not</em> a list of supported
     93  1.11  mrg hosts or targets.  Not all supported hosts and targets are listed
     94  1.11  mrg here, only the ones that require host-specific or target-specific
     95  1.11  mrg information have to. 
     96  1.11  mrg </p>
     97  1.11  mrg <ul>
     98  1.11  mrg <li> <a href="#aarch64-x-x">aarch64*-*-*</a>
     99  1.11  mrg </li><li> <a href="#alpha-x-x">alpha*-*-*</a>
    100  1.13  mrg </li><li> <a href="#amd64-x-solaris2">amd64-*-solaris2*</a>
    101  1.11  mrg </li><li> <a href="#arm-x-eabi">arm-*-eabi</a>
    102  1.11  mrg </li><li> <a href="#avr">avr</a>
    103  1.11  mrg </li><li> <a href="#bfin">Blackfin</a>
    104  1.11  mrg </li><li> <a href="#dos">DOS</a>
    105  1.11  mrg </li><li> <a href="#x-x-freebsd">*-*-freebsd*</a>
    106  1.11  mrg </li><li> <a href="#h8300-hms">h8300-hms</a>
    107  1.11  mrg </li><li> <a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
    108  1.11  mrg </li><li> <a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
    109  1.11  mrg </li><li> <a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
    110  1.11  mrg </li><li> <a href="#x-x-linux-gnu">*-*-linux-gnu</a>
    111  1.11  mrg </li><li> <a href="#ix86-x-linux">i?86-*-linux*</a>
    112  1.13  mrg </li><li> <a href="#ix86-x-solaris2">i?86-*-solaris2*</a>
    113  1.11  mrg </li><li> <a href="#ia64-x-linux">ia64-*-linux</a>
    114  1.11  mrg </li><li> <a href="#ia64-x-hpux">ia64-*-hpux*</a>
    115  1.11  mrg </li><li> <a href="#x-ibm-aix">*-ibm-aix*</a>
    116  1.11  mrg </li><li> <a href="#iq2000-x-elf">iq2000-*-elf</a>
    117  1.11  mrg </li><li> <a href="#lm32-x-elf">lm32-*-elf</a>
    118  1.11  mrg </li><li> <a href="#lm32-x-uclinux">lm32-*-uclinux</a>
    119  1.11  mrg </li><li> <a href="#m32c-x-elf">m32c-*-elf</a>
    120  1.11  mrg </li><li> <a href="#m32r-x-elf">m32r-*-elf</a>
    121  1.11  mrg </li><li> <a href="#m68k-x-x">m68k-*-*</a>
    122  1.11  mrg </li><li> <a href="#m68k-uclinux">m68k-uclinux</a>
    123  1.11  mrg </li><li> <a href="#microblaze-x-elf">microblaze-*-elf</a>
    124  1.11  mrg </li><li> <a href="#mips-x-x">mips-*-*</a>
    125  1.11  mrg </li><li> <a href="#nds32le-x-elf">nds32le-*-elf</a>
    126  1.11  mrg </li><li> <a href="#nds32be-x-elf">nds32be-*-elf</a>
    127  1.11  mrg </li><li> <a href="#nvptx-x-none">nvptx-*-none</a>
    128  1.12  mrg </li><li> <a href="#or1k-x-elf">or1k-*-elf</a>
    129  1.12  mrg </li><li> <a href="#or1k-x-linux">or1k-*-linux</a>
    130  1.11  mrg </li><li> <a href="#powerpc-x-x">powerpc*-*-*</a>
    131  1.11  mrg </li><li> <a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
    132  1.11  mrg </li><li> <a href="#powerpc-x-elf">powerpc-*-elf</a>
    133  1.11  mrg </li><li> <a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
    134  1.11  mrg </li><li> <a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
    135  1.11  mrg </li><li> <a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
    136  1.11  mrg </li><li> <a href="#powerpc-x-eabi">powerpc-*-eabi</a>
    137  1.11  mrg </li><li> <a href="#powerpcle-x-elf">powerpcle-*-elf</a>
    138  1.11  mrg </li><li> <a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
    139  1.11  mrg </li><li> <a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
    140  1.11  mrg </li><li> <a href="#riscv32-x-elf">riscv32-*-elf</a>
    141  1.11  mrg </li><li> <a href="#riscv32-x-linux">riscv32-*-linux</a>
    142  1.11  mrg </li><li> <a href="#riscv64-x-elf">riscv64-*-elf</a>
    143  1.11  mrg </li><li> <a href="#riscv64-x-linux">riscv64-*-linux</a>
    144  1.11  mrg </li><li> <a href="#s390-x-linux">s390-*-linux*</a>
    145  1.11  mrg </li><li> <a href="#s390x-x-linux">s390x-*-linux*</a>
    146  1.11  mrg </li><li> <a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    147  1.11  mrg </li><li> <a href="#x-x-solaris2">*-*-solaris2*</a>
    148  1.11  mrg </li><li> <a href="#sparc-x-x">sparc*-*-*</a>
    149  1.11  mrg </li><li> <a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    150  1.11  mrg </li><li> <a href="#sparc-x-linux">sparc-*-linux*</a>
    151  1.11  mrg </li><li> <a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    152  1.11  mrg </li><li> <a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    153  1.11  mrg </li><li> <a href="#c6x-x-x">c6x-*-*</a>
    154  1.11  mrg </li><li> <a href="#tilegx-x-linux">tilegx-*-linux*</a>
    155  1.11  mrg </li><li> <a href="#tilegxbe-x-linux">tilegxbe-*-linux*</a>
    156  1.11  mrg </li><li> <a href="#tilepro-x-linux">tilepro-*-linux*</a>
    157  1.11  mrg </li><li> <a href="#visium-x-elf">visium-*-elf</a>
    158  1.11  mrg </li><li> <a href="#x-x-vxworks">*-*-vxworks*</a>
    159  1.11  mrg </li><li> <a href="#x86-64-x-x">x86_64-*-*, amd64-*-*</a>
    160  1.13  mrg </li><li> <a href="#x86-64-x-solaris2">x86_64-*-solaris2*</a>
    161  1.11  mrg </li><li> <a href="#xtensa-x-elf">xtensa*-*-elf</a>
    162  1.11  mrg </li><li> <a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    163  1.11  mrg </li><li> <a href="#windows">Microsoft Windows</a>
    164  1.11  mrg </li><li> <a href="#x-x-cygwin">*-*-cygwin</a>
    165  1.11  mrg </li><li> <a href="#x-x-mingw32">*-*-mingw32</a>
    166  1.11  mrg </li><li> <a href="#os2">OS/2</a>
    167  1.11  mrg </li><li> <a href="#older">Older systems</a>
    168  1.11  mrg </li></ul>
    169  1.11  mrg 
    170  1.11  mrg <ul>
    171  1.11  mrg <li> <a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.)
    172  1.11  mrg </li></ul>
    173  1.11  mrg 
    174  1.11  mrg 
    175  1.11  mrg <!-- -------- host/target specific issues start here ---------------- -->
    176  1.11  mrg <hr />
    177  1.13  mrg <span id="aarch64-x-x"></span><span id="aarch64*-*-*"></span><h3 class="heading">aarch64*-*-*</h3>
    178  1.11  mrg <p>Binutils pre 2.24 does not have support for selecting <samp>-mabi</samp> and
    179  1.11  mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    180  1.11  mrg not support option <samp>-mabi=ilp32</samp>.
    181  1.11  mrg </p>
    182  1.11  mrg <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    183  1.11  mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    184  1.11  mrg <samp>--enable-fix-cortex-a53-835769</samp> option.  This will enable the fix by
    185  1.11  mrg default and can be explicitly disabled during compilation by passing the
    186  1.11  mrg <samp>-mno-fix-cortex-a53-835769</samp> option.  Conversely,
    187  1.11  mrg <samp>--disable-fix-cortex-a53-835769</samp> will disable the workaround by
    188  1.11  mrg default.  The workaround is disabled by default if neither of
    189  1.11  mrg <samp>--enable-fix-cortex-a53-835769</samp> or
    190  1.11  mrg <samp>--disable-fix-cortex-a53-835769</samp> is given at configure time.
    191  1.11  mrg </p>
    192  1.11  mrg <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    193  1.11  mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    194  1.11  mrg <samp>--enable-fix-cortex-a53-843419</samp> option.  This workaround is applied at
    195  1.11  mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    196  1.11  mrg to the linker.  It can be explicitly disabled during compilation by passing the
    197  1.11  mrg <samp>-mno-fix-cortex-a53-843419</samp> option.  Conversely,
    198  1.11  mrg <samp>--disable-fix-cortex-a53-843419</samp> will disable the workaround by default.
    199  1.11  mrg The workaround is disabled by default if neither of
    200  1.11  mrg <samp>--enable-fix-cortex-a53-843419</samp> or
    201  1.11  mrg <samp>--disable-fix-cortex-a53-843419</samp> is given at configure time.
    202  1.11  mrg </p>
    203  1.12  mrg <p>To enable Branch Target Identification Mechanism and Return Address Signing by
    204  1.12  mrg default at configure time use the <samp>--enable-standard-branch-protection</samp>
    205  1.12  mrg option.  This is equivalent to having <samp>-mbranch-protection=standard</samp>
    206  1.12  mrg during compilation.  This can be explicitly disabled during compilation by
    207  1.12  mrg passing the <samp>-mbranch-protection=none</samp> option which turns off all
    208  1.12  mrg types of branch protections.  Conversely,
    209  1.12  mrg <samp>--disable-standard-branch-protection</samp> will disable both the
    210  1.12  mrg protections by default.  This mechanism is turned off by default if neither
    211  1.12  mrg of the options are given at configure time.
    212  1.12  mrg </p>
    213  1.11  mrg <hr />
    214  1.13  mrg <span id="alpha-x-x"></span><span id="alpha*-*-*"></span><h3 class="heading">alpha*-*-*</h3>
    215  1.11  mrg <p>This section contains general configuration information for all
    216  1.11  mrg Alpha-based platforms using ELF.  In addition to reading this
    217  1.11  mrg section, please read all other sections that match your target.
    218  1.11  mrg </p>
    219  1.11  mrg <hr />
    220  1.13  mrg <span id="amd64-x-solaris2"></span><span id="amd64-*-solaris2*"></span><h3 class="heading">amd64-*-solaris2*</h3>
    221  1.13  mrg <p>This is a synonym for &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo;.
    222  1.11  mrg </p>
    223  1.11  mrg <hr />
    224  1.13  mrg <span id="amdgcn-x-amdhsa"></span><span id="amdgcn-*-amdhsa"></span><h3 class="heading">amdgcn-*-amdhsa</h3>
    225  1.12  mrg <p>AMD GCN GPU target.
    226  1.12  mrg </p>
    227  1.12  mrg <p>Instead of GNU Binutils, you will need to install LLVM 6, or later, and copy
    228  1.13  mrg <samp>bin/llvm-mc</samp> to <samp>amdgcn-amdhsa/bin/as</samp>,
    229  1.13  mrg <samp>bin/lld</samp> to <samp>amdgcn-amdhsa/bin/ld</samp>,
    230  1.13  mrg <samp>bin/llvm-nm</samp> to <samp>amdgcn-amdhsa/bin/nm</samp>, and
    231  1.13  mrg <samp>bin/llvm-ar</samp> to both <samp>bin/amdgcn-amdhsa-ar</samp> and
    232  1.13  mrg <samp>bin/amdgcn-amdhsa-ranlib</samp>.
    233  1.12  mrg </p>
    234  1.12  mrg <p>Use Newlib (2019-01-16, or newer).
    235  1.12  mrg </p>
    236  1.12  mrg <p>To run the binaries, install the HSA Runtime from the
    237  1.12  mrg <a href="https://rocm.github.io">ROCm Platform</a>, and use
    238  1.13  mrg <samp>libexec/gcc/amdhsa-amdhsa/<var>version</var>/gcn-run</samp> to launch them
    239  1.12  mrg on the GPU.
    240  1.12  mrg </p>
    241  1.12  mrg <hr />
    242  1.13  mrg <span id="arc-x-elf32"></span><span id="arc-*-elf32"></span><h3 class="heading">arc-*-elf32</h3>
    243  1.11  mrg 
    244  1.11  mrg <p>Use &lsquo;<samp>configure --target=arc-elf32 --with-cpu=<var>cpu</var> --enable-languages=&quot;c,c++&quot;</samp>&rsquo;
    245  1.11  mrg to configure GCC, with <var>cpu</var> being one of &lsquo;<samp>arc600</samp>&rsquo;, &lsquo;<samp>arc601</samp>&rsquo;,
    246  1.11  mrg or &lsquo;<samp>arc700</samp>&rsquo;.
    247  1.11  mrg </p>
    248  1.11  mrg <hr />
    249  1.13  mrg <span id="arc-linux-uclibc"></span><span id="arc-linux-uclibc-1"></span><h3 class="heading">arc-linux-uclibc</h3>
    250  1.11  mrg 
    251  1.11  mrg <p>Use &lsquo;<samp>configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages=&quot;c,c++&quot;</samp>&rsquo; to configure GCC.
    252  1.11  mrg </p>
    253  1.11  mrg <hr />
    254  1.13  mrg <span id="arm-x-eabi"></span><span id="arm-*-eabi"></span><h3 class="heading">arm-*-eabi</h3>
    255  1.10  mrg <p>ARM-family processors.
    256  1.11  mrg </p>
    257  1.11  mrg <p>Building the Ada frontend commonly fails (an infinite loop executing
    258   1.7  mrg <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    259   1.7  mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    260  1.11  mrg </p>
    261  1.11  mrg <hr />
    262  1.13  mrg <span id="avr"></span><span id="avr-1"></span><h3 class="heading">avr</h3>
    263   1.1  mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    264  1.11  mrg applications.  There are no standard Unix configurations.
    265   1.1  mrg See &ldquo;AVR Options&rdquo; in the main manual
    266   1.1  mrg for the list of supported MCU types.
    267  1.11  mrg </p>
    268  1.11  mrg <p>Use &lsquo;<samp>configure --target=avr --enable-languages=&quot;c&quot;</samp>&rsquo; to configure GCC.
    269  1.11  mrg </p>
    270  1.11  mrg <p>Further installation notes and other useful information about AVR tools
    271   1.1  mrg can also be obtained from:
    272  1.11  mrg </p>
    273  1.11  mrg <ul>
    274  1.11  mrg <li> <a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    275  1.11  mrg </li><li> <a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    276  1.11  mrg </li></ul>
    277  1.11  mrg 
    278  1.11  mrg <p>The following error:
    279  1.13  mrg </p><div class="example">
    280  1.13  mrg <pre class="example">Error: register required
    281  1.11  mrg </pre></div>
    282  1.11  mrg 
    283  1.11  mrg <p>indicates that you should upgrade to a newer version of the binutils.
    284  1.11  mrg </p>
    285  1.11  mrg <hr />
    286  1.13  mrg <span id="bfin"></span><span id="Blackfin"></span><h3 class="heading">Blackfin</h3>
    287  1.11  mrg <p>The Blackfin processor, an Analog Devices DSP.
    288   1.1  mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    289  1.11  mrg </p>
    290  1.11  mrg <p>More information, and a version of binutils with support for this processor,
    291  1.13  mrg are available at <a href="https://sourceforge.net/projects/adi-toolchain/">https://sourceforge.net/projects/adi-toolchain/</a>.
    292  1.11  mrg </p>
    293  1.11  mrg <hr />
    294  1.13  mrg <span id="cr16"></span><span id="CR16"></span><h3 class="heading">CR16</h3>
    295   1.5  mrg <p>The CR16 CompactRISC architecture is a 16-bit architecture. This
    296   1.5  mrg architecture is used in embedded applications.
    297  1.11  mrg </p>
    298   1.3  mrg 
    299  1.11  mrg <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    300  1.11  mrg </p>
    301  1.11  mrg <p>Use &lsquo;<samp>configure --target=cr16-elf --enable-languages=c,c++</samp>&rsquo; to configure
    302  1.11  mrg GCC&nbsp;for building a CR16 elf cross-compiler.
    303  1.11  mrg </p>
    304  1.11  mrg <p>Use &lsquo;<samp>configure --target=cr16-uclinux --enable-languages=c,c++</samp>&rsquo; to
    305  1.11  mrg configure GCC&nbsp;for building a CR16 uclinux cross-compiler.
    306  1.11  mrg </p>
    307  1.11  mrg <hr />
    308  1.13  mrg <span id="cris"></span><span id="CRIS"></span><h3 class="heading">CRIS</h3>
    309   1.1  mrg <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    310   1.1  mrg series.  These are used in embedded applications.
    311  1.11  mrg </p>
    312  1.11  mrg <p>See &ldquo;CRIS Options&rdquo; in the main manual
    313   1.1  mrg for a list of CRIS-specific options.
    314  1.11  mrg </p>
    315  1.11  mrg <p>There are a few different CRIS targets:
    316  1.11  mrg </p><dl compact="compact">
    317  1.13  mrg <dt><span><code>cris-axis-elf</code></span></dt>
    318  1.11  mrg <dd><p>Mainly for monolithic embedded systems.  Includes a multilib for the
    319  1.11  mrg &lsquo;<samp>v10</samp>&rsquo; core used in &lsquo;<samp>ETRAX 100 LX</samp>&rsquo;.
    320  1.11  mrg </p></dd>
    321  1.13  mrg <dt><span><code>cris-axis-linux-gnu</code></span></dt>
    322  1.11  mrg <dd><p>A GNU/Linux port for the CRIS architecture, currently targeting
    323  1.11  mrg &lsquo;<samp>ETRAX 100 LX</samp>&rsquo; by default.
    324  1.11  mrg </p></dd>
    325   1.1  mrg </dl>
    326   1.1  mrg 
    327  1.11  mrg <p>Pre-packaged tools can be obtained from
    328   1.1  mrg <a href="ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/">ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/</a>.  More
    329   1.1  mrg information about this platform is available at
    330   1.1  mrg <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    331  1.11  mrg </p>
    332  1.11  mrg <hr />
    333  1.13  mrg <span id="dos"></span><span id="DOS"></span><h3 class="heading">DOS</h3>
    334   1.1  mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    335  1.11  mrg </p>
    336  1.11  mrg <p>You cannot install GCC by itself on MSDOS; it will not compile under
    337   1.1  mrg any MSDOS compiler except itself.  You need to get the complete
    338   1.1  mrg compilation package DJGPP, which includes binaries as well as sources,
    339   1.1  mrg and includes all the necessary compilation tools and libraries.
    340  1.11  mrg </p>
    341  1.11  mrg <hr />
    342  1.13  mrg <span id="epiphany-x-elf"></span><span id="epiphany-*-elf"></span><h3 class="heading">epiphany-*-elf</h3>
    343  1.11  mrg <p>Adapteva Epiphany.
    344   1.3  mrg This configuration is intended for embedded systems.
    345  1.11  mrg </p>
    346  1.11  mrg <hr />
    347  1.13  mrg <span id="x-x-freebsd"></span><span id="g_t*-*-freebsd*"></span><h3 class="heading">*-*-freebsd*</h3>
    348   1.1  mrg <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    349   1.1  mrg FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    350   1.1  mrg discontinued in GCC 4.0.
    351  1.11  mrg </p>
    352  1.11  mrg <p>In order to better utilize FreeBSD base system functionality and match
    353   1.3  mrg the configuration of the system compiler, GCC 4.5 and above as well as
    354   1.3  mrg GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    355   1.3  mrg on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    356   1.3  mrg (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    357  1.11  mrg <samp>libgcc_s.so.1</samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    358   1.3  mrg by GCC 4.5 and above.
    359  1.11  mrg </p>
    360  1.11  mrg <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    361  1.11  mrg for all CPU architectures.  You may use <samp>-gstabs</samp> instead of
    362  1.11  mrg <samp>-g</samp>, if you really want the old debugging format.  There are
    363   1.1  mrg no known issues with mixing object files and libraries with different
    364   1.1  mrg debugging formats.  Otherwise, this release of GCC should now match
    365   1.1  mrg more of the configuration used in the stock FreeBSD configuration of
    366  1.11  mrg GCC.  In particular, <samp>--enable-threads</samp> is now configured by
    367   1.1  mrg default.  However, as a general user, do not attempt to replace the
    368   1.1  mrg system compiler with this release.  Known to bootstrap and check with
    369   1.1  mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    370   1.1  mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    371   1.1  mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    372  1.11  mrg </p>
    373  1.11  mrg <p>The version of binutils installed in <samp>/usr/bin</samp> probably works
    374   1.1  mrg with this release of GCC.  Bootstrapping against the latest GNU
    375  1.11  mrg binutils and/or the version found in <samp>/usr/ports/devel/binutils</samp> has
    376   1.1  mrg been known to enable additional features and improve overall testsuite
    377  1.10  mrg results.  However, it is currently known that boehm-gc may not configure
    378  1.10  mrg properly on FreeBSD prior to the FreeBSD 7.0 release with GNU binutils
    379  1.10  mrg after 2.16.1.
    380  1.11  mrg </p>
    381  1.11  mrg <hr />
    382  1.13  mrg <span id="ft32-x-elf"></span><span id="ft32-*-elf"></span><h3 class="heading">ft32-*-elf</h3>
    383  1.11  mrg <p>The FT32 processor.
    384   1.7  mrg This configuration is intended for embedded systems.
    385  1.11  mrg </p>
    386  1.11  mrg <hr />
    387  1.13  mrg <span id="h8300-hms"></span><span id="h8300-hms-1"></span><h3 class="heading">h8300-hms</h3>
    388   1.1  mrg <p>Renesas H8/300 series of processors.
    389  1.11  mrg </p>
    390  1.11  mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    391  1.11  mrg </p>
    392  1.11  mrg <p>The calling convention and structure layout has changed in release 2.6.
    393   1.1  mrg All code must be recompiled.  The calling convention now passes the
    394   1.1  mrg first three arguments in function calls in registers.  Structures are no
    395   1.1  mrg longer a multiple of 2 bytes.
    396  1.11  mrg </p>
    397  1.11  mrg <hr />
    398  1.13  mrg <span id="hppa-hp-hpux"></span><span id="hppa*-hp-hpux*"></span><h3 class="heading">hppa*-hp-hpux*</h3>
    399   1.1  mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    400  1.11  mrg </p>
    401  1.11  mrg <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    402   1.1  mrg later is recommended.
    403  1.11  mrg </p>
    404  1.11  mrg <p>It may be helpful to configure GCC with the
    405  1.11  mrg <a href="./configure.html#with-gnu-as"><samp>--with-gnu-as</samp></a> and
    406  1.11  mrg <samp>--with-as=&hellip;</samp> options to ensure that GCC can find GAS.
    407  1.11  mrg </p>
    408  1.11  mrg <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    409  1.11  mrg not work.  It shouldn&rsquo;t be used with any languages other than C due to its
    410   1.1  mrg many limitations.
    411  1.11  mrg </p>
    412  1.11  mrg <p>Specifically, <samp>-g</samp> does not work (HP-UX uses a peculiar debugging
    413   1.1  mrg format which GCC does not know about).  It also inserts timestamps
    414   1.1  mrg into each object file it creates, causing the 3-stage comparison test to
    415   1.1  mrg fail during a bootstrap.  You should be able to continue by saying
    416  1.11  mrg &lsquo;<samp>make all-host all-target</samp>&rsquo; after getting the failure from &lsquo;<samp>make</samp>&rsquo;.
    417  1.11  mrg </p>
    418  1.11  mrg <p>Various GCC features are not supported.  For example, it does not support weak
    419   1.1  mrg symbols or alias definitions.  As a result, explicit template instantiations
    420   1.1  mrg are required when using C++.  This makes it difficult if not impossible to
    421   1.1  mrg build many C++ applications.
    422  1.11  mrg </p>
    423  1.11  mrg <p>There are two default scheduling models for instructions.  These are
    424   1.1  mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    425  1.11  mrg architecture specified for the target machine when configuring.
    426   1.1  mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    427  1.11  mrg the target is a &lsquo;<samp>hppa1*</samp>&rsquo; machine.
    428  1.11  mrg </p>
    429  1.11  mrg <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    430   1.1  mrg it is important to completely specify the machine architecture when
    431   1.1  mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    432   1.1  mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    433   1.1  mrg default scheduling model is desired.
    434  1.11  mrg </p>
    435  1.11  mrg <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    436  1.11  mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
    437   1.1  mrg This namespace change might cause problems when bootstrapping with
    438   1.1  mrg an earlier version of GCC or the HP compiler as essentially the same
    439   1.1  mrg namespace is required for an entire build.  This problem can be avoided
    440  1.11  mrg in a number of ways.  With HP cc, <code>UNIX_STD</code> can be set to &lsquo;<samp>95</samp>&rsquo;
    441  1.11  mrg or &lsquo;<samp>98</samp>&rsquo;.  Another way is to add an appropriate set of predefines
    442  1.11  mrg to <code>CC</code>.  The description for the <samp>munix=</samp> option contains
    443   1.1  mrg a list of the predefines used with each standard.
    444  1.11  mrg </p>
    445  1.11  mrg <p>More specific information to &lsquo;<samp>hppa*-hp-hpux*</samp>&rsquo; targets follows.
    446  1.11  mrg </p>
    447  1.11  mrg <hr />
    448  1.13  mrg <span id="hppa-hp-hpux10"></span><span id="hppa*-hp-hpux10"></span><h3 class="heading">hppa*-hp-hpux10</h3>
    449   1.1  mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    450   1.1  mrg <code>PHCO_19798</code> from HP.
    451  1.11  mrg </p>
    452  1.11  mrg <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    453   1.1  mrg used for one-only code and data.  This resolves many of the previous
    454   1.1  mrg problems in using C++ on this target.  However, the ABI is not compatible
    455   1.1  mrg with the one implemented under HP-UX 11 using secondary definitions.
    456  1.11  mrg </p>
    457  1.11  mrg <hr />
    458  1.13  mrg <span id="hppa-hp-hpux11"></span><span id="hppa*-hp-hpux11"></span><h3 class="heading">hppa*-hp-hpux11</h3>
    459   1.1  mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    460   1.1  mrg be used to compile GCC 3.0 and up.
    461  1.11  mrg </p>
    462  1.11  mrg <p>The libffi library haven&rsquo;t been ported to 64-bit HP-UX&nbsp;and doesn&rsquo;t build.
    463  1.11  mrg </p>
    464  1.11  mrg <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    465   1.1  mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    466  1.10  mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    467   1.1  mrg only available for the 32-bit PA-RISC runtime.
    468  1.11  mrg </p>
    469  1.11  mrg <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    470  1.11  mrg bundled compiler supports only traditional C; you will need either HP&rsquo;s
    471   1.1  mrg unbundled compiler, or a binary distribution of GCC.
    472  1.11  mrg </p>
    473  1.11  mrg <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    474   1.1  mrg but the process requires several steps.  GCC 3.3 can then be used to
    475  1.10  mrg build later versions.
    476  1.11  mrg </p>
    477  1.11  mrg <p>There are several possible approaches to building the distribution.
    478   1.1  mrg Binutils can be built first using the HP tools.  Then, the GCC
    479   1.1  mrg distribution can be built.  The second approach is to build GCC
    480  1.11  mrg first using the HP tools, then build binutils, then rebuild GCC.
    481   1.1  mrg There have been problems with various binary distributions, so it
    482   1.1  mrg is best not to start from a binary distribution.
    483  1.11  mrg </p>
    484  1.11  mrg <p>On 64-bit capable systems, there are two distinct targets.  Different
    485   1.1  mrg installation prefixes must be used if both are to be installed on
    486  1.11  mrg the same system.  The &lsquo;<samp>hppa[1-2]*-hp-hpux11*</samp>&rsquo; target generates code
    487  1.11  mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker.
    488  1.11  mrg The &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target generates 64-bit code for the
    489   1.1  mrg PA-RISC 2.0 architecture.
    490  1.11  mrg </p>
    491  1.11  mrg <p>The script config.guess now selects the target type based on the compiler
    492  1.11  mrg detected during configuration.  You must define <code>PATH</code> or <code>CC</code> so
    493  1.11  mrg that configure finds an appropriate compiler for the initial bootstrap.
    494  1.11  mrg When <code>CC</code> is used, the definition should contain the options that are
    495  1.11  mrg needed whenever <code>CC</code> is used.
    496  1.11  mrg </p>
    497  1.11  mrg <p>Specifically, options that determine the runtime architecture must be
    498  1.11  mrg in <code>CC</code> to correctly select the target for the build.  It is also
    499  1.11  mrg convenient to place many other compiler options in <code>CC</code>.  For example,
    500  1.11  mrg <code>CC=&quot;cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE&quot;</code>
    501   1.1  mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    502  1.11  mrg 64-bit K&amp;R/bundled mode.  The <samp>+DA2.0W</samp> option will result in
    503  1.11  mrg the automatic selection of the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target.  The
    504   1.1  mrg macro definition table of cpp needs to be increased for a successful
    505   1.1  mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    506   1.1  mrg be defined when building with the bundled compiler, or when using the
    507  1.11  mrg <samp>-Ac</samp> option.  These defines aren&rsquo;t necessary with <samp>-Ae</samp>.
    508  1.11  mrg </p>
    509  1.11  mrg <p>It is best to explicitly configure the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target
    510  1.11  mrg with the <samp>--with-ld=&hellip;</samp> option.  This overrides the standard
    511   1.1  mrg search for ld.  The two linkers supported on this target require different
    512   1.1  mrg commands.  The default linker is determined during configuration.  As a
    513  1.11  mrg result, it&rsquo;s not possible to switch linkers in the middle of a GCC build.
    514   1.1  mrg This has been reported to sometimes occur in unified builds of binutils
    515   1.1  mrg and GCC.
    516  1.11  mrg </p>
    517  1.11  mrg <p>A recent linker patch must be installed for the correct operation of
    518   1.1  mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    519   1.1  mrg oldest linker patches that are known to work.  They are for HP-UX
    520   1.1  mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    521  1.11  mrg <code>PHSS_24304</code>, might be usable but it hasn&rsquo;t been tested.  These
    522   1.1  mrg patches have been superseded.  Consult the HP patch database to obtain
    523   1.1  mrg the currently recommended linker patch for your system.
    524  1.11  mrg </p>
    525  1.11  mrg <p>The patches are necessary for the support of weak symbols on the
    526   1.1  mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    527   1.1  mrg symbols are implemented using SOM secondary definition symbols.  Prior
    528  1.11  mrg to HP-UX 11, there are bugs in the linker support for secondary symbols.
    529   1.1  mrg The patches correct a problem of linker core dumps creating shared
    530   1.1  mrg libraries containing secondary symbols, as well as various other
    531   1.1  mrg linking issues involving secondary symbols.
    532  1.11  mrg </p>
    533  1.11  mrg <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    534   1.1  mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    535  1.11  mrg uses the linker <samp>+init</samp> and <samp>+fini</samp> options for the same
    536   1.1  mrg purpose.  The patches correct various problems with the +init/+fini
    537   1.1  mrg options, including program core dumps.  Binutils 2.14 corrects a
    538  1.11  mrg problem on the 64-bit port resulting from HP&rsquo;s non-standard use of
    539   1.1  mrg the .init and .fini sections for array initializers and finalizers.
    540  1.11  mrg </p>
    541  1.11  mrg <p>Although the HP and GNU linkers are both supported for the
    542  1.11  mrg &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target, it is strongly recommended that the
    543   1.1  mrg HP linker be used for link editing on this target.
    544  1.11  mrg </p>
    545  1.11  mrg <p>At this time, the GNU linker does not support the creation of long
    546  1.10  mrg branch stubs.  As a result, it cannot successfully link binaries
    547   1.1  mrg containing branch offsets larger than 8 megabytes.  In addition,
    548   1.1  mrg there are problems linking shared libraries, linking executables
    549  1.11  mrg with <samp>-static</samp>, and with dwarf2 unwind and exception support.
    550  1.11  mrg It also doesn&rsquo;t provide stubs for internal calls to global functions
    551  1.10  mrg in shared libraries, so these calls cannot be overloaded.
    552  1.11  mrg </p>
    553  1.11  mrg <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    554   1.1  mrg versioning is not supported.  It may be necessary to disable symbol
    555  1.11  mrg versioning with <samp>--disable-symvers</samp> when using GNU ld.
    556  1.11  mrg </p>
    557  1.11  mrg <p>POSIX threads are the default.  The optional DCE thread library is not
    558  1.11  mrg supported, so <samp>--enable-threads=dce</samp> does not work.
    559  1.11  mrg </p>
    560  1.11  mrg <hr />
    561  1.13  mrg <span id="x-x-linux-gnu"></span><span id="g_t*-*-linux-gnu"></span><h3 class="heading">*-*-linux-gnu</h3>
    562   1.1  mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    563   1.1  mrg in glibc 2.2.5 and later.  More information is available in the
    564   1.1  mrg libstdc++-v3 documentation.
    565  1.11  mrg </p>
    566  1.11  mrg <hr />
    567  1.13  mrg <span id="ix86-x-linux"></span><span id="i_003f86-*-linux*"></span><h3 class="heading">i?86-*-linux*</h3>
    568  1.11  mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform.
    569   1.1  mrg See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    570  1.11  mrg </p>
    571  1.11  mrg <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    572   1.1  mrg possible you have a hardware problem.  Further information on this can be
    573   1.1  mrg found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    574  1.11  mrg </p>
    575  1.11  mrg <hr />
    576  1.13  mrg <span id="ix86-x-solaris2"></span><span id="i_003f86-*-solaris2*"></span><h3 class="heading">i?86-*-solaris2*</h3>
    577  1.13  mrg <p>Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
    578  1.13  mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp>amd64-*-solaris2*</samp>&rsquo; or
    579  1.13  mrg &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo; configuration that corresponds to
    580  1.11  mrg &lsquo;<samp>sparcv9-sun-solaris2*</samp>&rsquo;.
    581  1.11  mrg </p>
    582  1.11  mrg <p>It is recommended that you configure GCC to use the GNU assembler.  The
    583  1.13  mrg versions included in Solaris 11.3, from GNU binutils 2.23.1 or
    584  1.13  mrg newer (available as <samp>/usr/bin/gas</samp> and
    585  1.11  mrg <samp>/usr/gnu/bin/as</samp>), work fine.  The current version, from GNU
    586  1.13  mrg binutils 2.34, is known to work.  Recent versions of the Solaris assembler in
    587  1.13  mrg <samp>/usr/bin/as</samp> work almost as well, though.
    588  1.13  mrg </p>
    589  1.13  mrg <p>For linking, the Solaris linker is preferred.  If you want to use the GNU
    590  1.13  mrg linker instead, the version in Solaris 11.3, from GNU binutils 2.23.1 or
    591  1.13  mrg newer (in <samp>/usr/gnu/bin/ld</samp> and <samp>/usr/bin/gld</samp>), works,
    592  1.13  mrg as does the latest version, from GNU binutils 2.34.
    593  1.11  mrg </p>
    594  1.11  mrg <p>To use GNU <code>as</code>, configure with the options
    595  1.13  mrg <samp>--with-gnu-as --with-as=/usr/gnu/bin/as</samp>.  It may be necessary
    596  1.11  mrg to configure with <samp>--without-gnu-ld --with-ld=/usr/ccs/bin/ld</samp> to
    597  1.13  mrg guarantee use of Solaris <code>ld</code>.
    598  1.11  mrg </p>
    599  1.11  mrg <hr />
    600  1.13  mrg <span id="ia64-x-linux"></span><span id="ia64-*-linux"></span><h3 class="heading">ia64-*-linux</h3>
    601   1.1  mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    602   1.1  mrg running GNU/Linux.
    603  1.11  mrg </p>
    604  1.11  mrg <p>If you are using the installed system libunwind library with
    605  1.11  mrg <samp>--with-system-libunwind</samp>, then you must use libunwind 0.98 or
    606   1.1  mrg later.
    607  1.11  mrg </p>
    608  1.11  mrg <p>None of the following versions of GCC has an ABI that is compatible
    609   1.1  mrg with any of the other versions in this list, with the exception that
    610   1.1  mrg Red Hat 2.96 and Trillian 000171 are compatible with each other:
    611  1.11  mrg 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717.
    612  1.11  mrg This primarily affects C++ programs and programs that create shared libraries.
    613  1.11  mrg GCC 3.1 or later is recommended for compiling linux, the kernel.
    614   1.1  mrg As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    615   1.1  mrg more major ABI changes are expected.
    616  1.11  mrg </p>
    617  1.11  mrg <hr />
    618  1.13  mrg <span id="ia64-x-hpux"></span><span id="ia64-*-hpux*"></span><h3 class="heading">ia64-*-hpux*</h3>
    619   1.1  mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    620   1.1  mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    621  1.11  mrg the option <samp>--with-gnu-as</samp> may be necessary.
    622  1.11  mrg </p>
    623  1.11  mrg <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    624  1.11  mrg GCC versions 3.2.3 and earlier, <samp>--enable-libunwind-exceptions</samp>
    625  1.11  mrg is required to build GCC.  For GCC 3.3 and later, this is the default.
    626  1.11  mrg For gcc 3.4.3 and later, <samp>--enable-libunwind-exceptions</samp> is
    627   1.1  mrg removed and the system libunwind library will always be used.
    628  1.11  mrg </p>
    629  1.11  mrg <hr />
    630  1.11  mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    631  1.13  mrg <span id="x-ibm-aix"></span><span id="g_t*-ibm-aix*"></span><h3 class="heading">*-ibm-aix*</h3>
    632  1.11  mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4.
    633   1.1  mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    634  1.11  mrg </p>
    635  1.11  mrg <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    636   1.1  mrg process resource limits (ulimit).  Hard limits are configured in the
    637  1.11  mrg <samp>/etc/security/limits</samp> system configuration file.
    638  1.11  mrg </p>
    639  1.11  mrg <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    640   1.7  mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    641   1.7  mrg G++ can bootstrap recent releases of GCC.
    642  1.11  mrg </p>
    643  1.11  mrg <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    644   1.1  mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    645   1.1  mrg requires a larger data segment, which can be enabled through the
    646   1.1  mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    647  1.11  mrg </p>
    648  1.13  mrg <div class="example">
    649  1.13  mrg <pre class="example">% LDR_CNTRL=MAXDATA=0x50000000
    650  1.11  mrg % export LDR_CNTRL
    651  1.11  mrg </pre></div>
    652   1.1  mrg 
    653  1.11  mrg <p>One can start with a pre-compiled version of GCC to build from
    654  1.11  mrg sources.  One may delete GCC&rsquo;s &ldquo;fixed&rdquo; header files when starting
    655   1.1  mrg with a version of GCC built for an earlier release of AIX.
    656  1.11  mrg </p>
    657  1.11  mrg <p>To speed up the configuration phases of bootstrapping and installing GCC,
    658  1.11  mrg one may use GNU Bash instead of AIX <code>/bin/sh</code>, e.g.,
    659  1.11  mrg </p>
    660  1.13  mrg <div class="example">
    661  1.13  mrg <pre class="example">% CONFIG_SHELL=/opt/freeware/bin/bash
    662  1.11  mrg % export CONFIG_SHELL
    663  1.11  mrg </pre></div>
    664   1.1  mrg 
    665  1.11  mrg <p>and then proceed as described in <a href="build.html">the build
    666  1.11  mrg instructions</a>, where we strongly recommend specifying an absolute path
    667   1.1  mrg to invoke <var>srcdir</var>/configure.
    668  1.11  mrg </p>
    669  1.11  mrg <p>Because GCC on AIX is built as a 32-bit executable by default,
    670   1.1  mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    671   1.1  mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    672   1.1  mrg as static archive libraries works better than shared libraries.
    673  1.11  mrg </p>
    674  1.11  mrg <p>Errors involving <code>alloca</code> when building GCC generally are due
    675   1.1  mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    676   1.1  mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    677  1.11  mrg the build, the native AIX compiler <strong>must</strong> be invoked as <code>cc</code>
    678  1.11  mrg (not <code>xlc</code>).  Once <code>configure</code> has been informed of
    679  1.11  mrg <code>xlc</code>, one needs to use &lsquo;<samp>make distclean</samp>&rsquo; to remove the
    680  1.11  mrg configure cache files and ensure that <code>CC</code> environment variable
    681  1.11  mrg does not provide a definition that will confuse <code>configure</code>.
    682   1.1  mrg If this error occurs during stage2 or later, then the problem most likely
    683   1.1  mrg is the version of Make (see above).
    684  1.11  mrg </p>
    685  1.11  mrg <p>The native <code>as</code> and <code>ld</code> are recommended for
    686   1.3  mrg bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    687   1.3  mrg Binutils version 2.20 is the minimum level that supports bootstrap on
    688  1.11  mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6&nbsp;or
    689   1.3  mrg AIX 7.  The native AIX tools do interoperate with GCC.
    690  1.11  mrg </p>
    691  1.11  mrg <p>AIX 7.1 added partial support for DWARF debugging, but full support
    692   1.7  mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    693   1.7  mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    694   1.7  mrg of libm.a missing important symbols; a fix for IV77796 will be
    695   1.7  mrg included in SP6.
    696  1.11  mrg </p>
    697  1.11  mrg <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    698   1.3  mrg assembler change that sometimes produces corrupt assembly files
    699   1.3  mrg causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    700   1.3  mrg can cause compilation failures with existing GCC installations.  An
    701   1.3  mrg AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    702   1.3  mrg IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    703   1.3  mrg AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    704   1.3  mrg AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    705  1.11  mrg </p>
    706  1.11  mrg <p>Building <samp>libstdc++.a</samp> requires a fix for an AIX Assembler bug
    707   1.1  mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    708   1.1  mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    709   1.1  mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    710  1.11  mrg </p>
    711  1.13  mrg <span id="TransferAixShobj"></span><p>&lsquo;<samp>libstdc++</samp>&rsquo; in GCC 3.4 increments the major version number of the
    712  1.11  mrg shared object and GCC installation places the <samp>libstdc++.a</samp>
    713   1.1  mrg shared library in a common location which will overwrite the and GCC
    714   1.1  mrg 3.3 version of the shared library.  Applications either need to be
    715   1.1  mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    716  1.11  mrg versions of the &lsquo;<samp>libstdc++</samp>&rsquo; shared object needs to be available
    717  1.11  mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp>libstdc++.so.4</samp>&rsquo;, if
    718  1.11  mrg present, and GCC 3.3 &lsquo;<samp>libstdc++.so.5</samp>&rsquo; shared objects can be
    719   1.1  mrg installed for runtime dynamic loading using the following steps to set
    720  1.11  mrg the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag in the shared object for <em>each</em>
    721  1.11  mrg multilib <samp>libstdc++.a</samp> installed:
    722  1.11  mrg </p>
    723  1.11  mrg <p>Extract the shared objects from the currently installed
    724  1.11  mrg <samp>libstdc++.a</samp> archive:
    725  1.13  mrg </p><div class="example">
    726  1.13  mrg <pre class="example">% ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    727  1.11  mrg </pre></div>
    728   1.1  mrg 
    729  1.11  mrg <p>Enable the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag so that the shared object will be
    730   1.1  mrg available for runtime dynamic loading, but not linking:
    731  1.13  mrg </p><div class="example">
    732  1.13  mrg <pre class="example">% strip -e libstdc++.so.4 libstdc++.so.5
    733  1.11  mrg </pre></div>
    734  1.11  mrg 
    735  1.11  mrg <p>Archive the runtime-only shared object in the GCC 3.4
    736  1.11  mrg <samp>libstdc++.a</samp> archive:
    737  1.13  mrg </p><div class="example">
    738  1.13  mrg <pre class="example">% ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    739  1.11  mrg </pre></div>
    740  1.11  mrg 
    741  1.11  mrg <p>Eventually, the
    742  1.11  mrg <a href="./configure.html#WithAixSoname"><samp>--with-aix-soname=svr4</samp></a>
    743   1.5  mrg configure option may drop the need for this procedure for libraries that
    744   1.5  mrg support it.
    745  1.11  mrg </p>
    746  1.11  mrg <p>Linking executables and shared libraries may produce warnings of
    747   1.1  mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    748   1.1  mrg have included multiple symbol definitions for certain global variable
    749   1.1  mrg and function declarations in the original program.  The warnings should
    750   1.1  mrg not prevent the linker from producing a correct library or runnable
    751   1.1  mrg executable.
    752  1.11  mrg </p>
    753  1.11  mrg <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    754   1.1  mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    755  1.11  mrg to parse archive libraries did not handle the new format correctly.
    756   1.1  mrg These routines are used by GCC and result in error messages during
    757   1.1  mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    758  1.11  mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp>-g</samp>
    759   1.1  mrg option of the archive command may be used to create archives of 32-bit
    760   1.1  mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    761   1.1  mrg routines is shipped with AIX 4.3.2 and above.
    762  1.11  mrg </p>
    763  1.11  mrg <p>Some versions of the AIX binder (linker) can fail with a relocation
    764  1.11  mrg overflow severe error when the <samp>-bbigtoc</samp> option is used to link
    765   1.1  mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    766   1.1  mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    767   1.1  mrg available from IBM Customer Support and from its
    768   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    769   1.1  mrg website as PTF U455193.
    770  1.11  mrg </p>
    771  1.11  mrg <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    772   1.1  mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    773   1.1  mrg APAR IX87327 is available from IBM Customer Support and from its
    774   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    775   1.1  mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    776  1.11  mrg </p>
    777  1.11  mrg <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    778   1.1  mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    779   1.1  mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    780   1.1  mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    781   1.1  mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    782  1.11  mrg </p>
    783  1.11  mrg <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    784   1.1  mrg use NLS to support locale-specific representations of various data
    785  1.11  mrg formats including floating-point numbers (e.g., &lsquo;<samp>.</samp>&rsquo;  vs &lsquo;<samp>,</samp>&rsquo; for
    786   1.1  mrg separating decimal fractions).  There have been problems reported where
    787   1.1  mrg GCC does not produce the same floating-point formats that the assembler
    788  1.11  mrg expects.  If one encounters this problem, set the <code>LANG</code>
    789  1.11  mrg environment variable to &lsquo;<samp>C</samp>&rsquo; or &lsquo;<samp>En_US</samp>&rsquo;.
    790  1.11  mrg </p>
    791  1.11  mrg <p>A default can be specified with the <samp>-mcpu=<var>cpu_type</var></samp>
    792  1.11  mrg switch and using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    793  1.11  mrg </p>
    794  1.11  mrg <hr />
    795  1.13  mrg <span id="iq2000-x-elf"></span><span id="iq2000-*-elf"></span><h3 class="heading">iq2000-*-elf</h3>
    796   1.1  mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    797   1.1  mrg applications.  There are no standard Unix configurations.
    798  1.11  mrg </p>
    799  1.11  mrg <hr />
    800  1.13  mrg <span id="lm32-x-elf"></span><span id="lm32-*-elf"></span><h3 class="heading">lm32-*-elf</h3>
    801  1.11  mrg <p>Lattice Mico32 processor.
    802   1.1  mrg This configuration is intended for embedded systems.
    803  1.11  mrg </p>
    804  1.11  mrg <hr />
    805  1.13  mrg <span id="lm32-x-uclinux"></span><span id="lm32-*-uclinux"></span><h3 class="heading">lm32-*-uclinux</h3>
    806  1.11  mrg <p>Lattice Mico32 processor.
    807   1.1  mrg This configuration is intended for embedded systems running uClinux.
    808  1.11  mrg </p>
    809  1.11  mrg <hr />
    810  1.13  mrg <span id="m32c-x-elf"></span><span id="m32c-*-elf"></span><h3 class="heading">m32c-*-elf</h3>
    811  1.11  mrg <p>Renesas M32C processor.
    812   1.1  mrg This configuration is intended for embedded systems.
    813  1.11  mrg </p>
    814  1.11  mrg <hr />
    815  1.13  mrg <span id="m32r-x-elf"></span><span id="m32r-*-elf"></span><h3 class="heading">m32r-*-elf</h3>
    816  1.11  mrg <p>Renesas M32R processor.
    817   1.1  mrg This configuration is intended for embedded systems.
    818  1.11  mrg </p>
    819  1.11  mrg <hr />
    820  1.13  mrg <span id="m68k-x-x"></span><span id="m68k-*-*"></span><h3 class="heading">m68k-*-*</h3>
    821   1.1  mrg <p>By default,
    822  1.11  mrg &lsquo;<samp>m68k-*-elf*</samp>&rsquo;, &lsquo;<samp>m68k-*-rtems</samp>&rsquo;,  &lsquo;<samp>m68k-*-uclinux</samp>&rsquo; and
    823  1.11  mrg &lsquo;<samp>m68k-*-linux</samp>&rsquo;
    824   1.1  mrg build libraries for both M680x0 and ColdFire processors.  If you only
    825   1.1  mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    826  1.11  mrg <samp>--with-arch=m68k</samp> to <code>configure</code>.  Alternatively, you
    827  1.11  mrg can omit the M680x0 libraries by passing <samp>--with-arch=cf</samp> to
    828  1.11  mrg <code>configure</code>.  These targets default to 5206 or 5475 code as
    829   1.1  mrg appropriate for the target system when
    830  1.11  mrg configured with <samp>--with-arch=cf</samp> and 68020 code otherwise.
    831  1.11  mrg </p>
    832  1.11  mrg <p>The &lsquo;<samp>m68k-*-netbsd</samp>&rsquo; and
    833  1.11  mrg &lsquo;<samp>m68k-*-openbsd</samp>&rsquo; targets also support the <samp>--with-arch</samp>
    834   1.1  mrg option.  They will generate ColdFire CFV4e code when configured with
    835  1.11  mrg <samp>--with-arch=cf</samp> and 68020 code otherwise.
    836  1.11  mrg </p>
    837  1.11  mrg <p>You can override the default processors listed above by configuring
    838  1.11  mrg with <samp>--with-cpu=<var>target</var></samp>.  This <var>target</var> can either
    839  1.11  mrg be a <samp>-mcpu</samp> argument or one of the following values:
    840  1.11  mrg &lsquo;<samp>m68000</samp>&rsquo;, &lsquo;<samp>m68010</samp>&rsquo;, &lsquo;<samp>m68020</samp>&rsquo;, &lsquo;<samp>m68030</samp>&rsquo;,
    841  1.11  mrg &lsquo;<samp>m68040</samp>&rsquo;, &lsquo;<samp>m68060</samp>&rsquo;, &lsquo;<samp>m68020-40</samp>&rsquo; and &lsquo;<samp>m68020-60</samp>&rsquo;.
    842  1.11  mrg </p>
    843  1.11  mrg <p>GCC requires at least binutils version 2.17 on these targets.
    844  1.11  mrg </p>
    845  1.11  mrg <hr />
    846  1.13  mrg <span id="m68k-x-uclinux"></span><span id="m68k-*-uclinux"></span><h3 class="heading">m68k-*-uclinux</h3>
    847   1.1  mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    848  1.11  mrg &lsquo;<samp>m68k-linux-gnu</samp>&rsquo; ABI rather than the &lsquo;<samp>m68k-elf</samp>&rsquo; ABI.
    849   1.1  mrg It also added improved support for C++ and flat shared libraries,
    850   1.3  mrg both of which were ABI changes.
    851  1.11  mrg </p>
    852  1.11  mrg <hr />
    853  1.13  mrg <span id="microblaze-x-elf"></span><span id="microblaze-*-elf"></span><h3 class="heading">microblaze-*-elf</h3>
    854  1.11  mrg <p>Xilinx MicroBlaze processor.
    855   1.1  mrg This configuration is intended for embedded systems.
    856  1.11  mrg </p>
    857  1.11  mrg <hr />
    858  1.13  mrg <span id="mips-x-x"></span><span id="mips-*-*"></span><h3 class="heading">mips-*-*</h3>
    859   1.1  mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    860  1.11  mrg sections for all it&rsquo;s [sic] sectons [sic]&rdquo;, don&rsquo;t worry about it.  This
    861   1.1  mrg happens whenever you use GAS with the MIPS linker, but there is not
    862   1.1  mrg really anything wrong, and it is okay to use the output file.  You can
    863   1.1  mrg stop such warnings by installing the GNU linker.
    864  1.11  mrg </p>
    865  1.11  mrg <p>It would be nice to extend GAS to produce the gp tables, but they are
    866   1.1  mrg optional, and there should not be a warning about their absence.
    867  1.11  mrg </p>
    868  1.11  mrg <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    869   1.1  mrg and later.  A patch went in just after the GCC 3.3 release to
    870  1.11  mrg make &lsquo;<samp>mips*-*-*</samp>&rsquo; use the generic implementation instead.  You can also
    871  1.11  mrg configure for &lsquo;<samp>mipsel-elf</samp>&rsquo; as a workaround.  The
    872  1.11  mrg &lsquo;<samp>mips*-*-linux*</samp>&rsquo; target continues to use the MIPS II routines.  More
    873   1.1  mrg work on this is expected in future releases.
    874  1.11  mrg </p>
    875   1.1  mrg 
    876  1.11  mrg <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    877  1.11  mrg later systems and others that support the &lsquo;<samp>ll</samp>&rsquo;, &lsquo;<samp>sc</samp>&rsquo; and
    878  1.11  mrg &lsquo;<samp>sync</samp>&rsquo; instructions.  This can be overridden by passing
    879  1.11  mrg <samp>--with-llsc</samp> or <samp>--without-llsc</samp> when configuring GCC.
    880   1.1  mrg Since the Linux kernel emulates these instructions if they are
    881  1.11  mrg missing, the default for &lsquo;<samp>mips*-*-linux*</samp>&rsquo; targets is
    882  1.11  mrg <samp>--with-llsc</samp>.  The <samp>--with-llsc</samp> and
    883  1.11  mrg <samp>--without-llsc</samp> configure options may be overridden at compile
    884  1.11  mrg time by passing the <samp>-mllsc</samp> or <samp>-mno-llsc</samp> options to
    885   1.1  mrg the compiler.
    886  1.11  mrg </p>
    887  1.11  mrg <p>MIPS systems check for division by zero (unless
    888  1.11  mrg <samp>-mno-check-zero-division</samp> is passed to the compiler) by
    889   1.1  mrg generating either a conditional trap or a break instruction.  Using
    890   1.1  mrg trap results in smaller code, but is only supported on MIPS II and
    891   1.1  mrg later.  Also, some versions of the Linux kernel have a bug that
    892   1.1  mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    893  1.11  mrg the use of break, use the <samp>--with-divide=breaks</samp>
    894  1.11  mrg <code>configure</code> option when configuring GCC.  The default is to
    895   1.1  mrg use traps on systems that support them.
    896  1.11  mrg </p>
    897  1.11  mrg <hr />
    898  1.13  mrg <span id="moxie-x-elf"></span><span id="moxie-*-elf"></span><h3 class="heading">moxie-*-elf</h3>
    899   1.3  mrg <p>The moxie processor.
    900  1.11  mrg </p>
    901  1.11  mrg <hr />
    902  1.13  mrg <span id="msp430-x-elf"></span><span id="msp430-*-elf*"></span><h3 class="heading">msp430-*-elf*</h3>
    903  1.11  mrg <p>TI MSP430 processor.
    904   1.5  mrg This configuration is intended for embedded systems.
    905  1.11  mrg </p>
    906  1.13  mrg <p>&lsquo;<samp>msp430-*-elf</samp>&rsquo; is the standard configuration with most GCC
    907  1.13  mrg features enabled by default.
    908  1.13  mrg </p>
    909  1.13  mrg <p>&lsquo;<samp>msp430-*-elfbare</samp>&rsquo; is tuned for a bare-metal environment, and disables
    910  1.13  mrg features related to shared libraries and other functionality not used for
    911  1.13  mrg this device.  This reduces code and data usage of the GCC libraries, resulting
    912  1.13  mrg in a minimal run-time environment by default.
    913  1.13  mrg </p>
    914  1.13  mrg <p>Features disabled by default include:
    915  1.13  mrg </p><ul>
    916  1.13  mrg <li> transactional memory
    917  1.13  mrg </li><li> __cxa_atexit
    918  1.13  mrg </li></ul>
    919  1.13  mrg 
    920  1.11  mrg <hr />
    921  1.13  mrg <span id="nds32le-x-elf"></span><span id="nds32le-*-elf"></span><h3 class="heading">nds32le-*-elf</h3>
    922   1.5  mrg <p>Andes NDS32 target in little endian mode.
    923  1.11  mrg </p>
    924  1.11  mrg <hr />
    925  1.13  mrg <span id="nds32be-x-elf"></span><span id="nds32be-*-elf"></span><h3 class="heading">nds32be-*-elf</h3>
    926   1.5  mrg <p>Andes NDS32 target in big endian mode.
    927  1.11  mrg </p>
    928  1.11  mrg <hr />
    929  1.13  mrg <span id="nvptx-x-none"></span><span id="nvptx-*-none"></span><h3 class="heading">nvptx-*-none</h3>
    930   1.5  mrg <p>Nvidia PTX target.
    931  1.11  mrg </p>
    932  1.11  mrg <p>Instead of GNU binutils, you will need to install
    933  1.11  mrg <a href="https://github.com/MentorEmbedded/nvptx-tools/">nvptx-tools</a>.
    934   1.5  mrg Tell GCC where to find it:
    935  1.11  mrg <samp>--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</samp>.
    936  1.11  mrg </p>
    937  1.11  mrg <p>You will need newlib 3.0 git revision
    938  1.11  mrg cd31fbb2aea25f94d7ecedc9db16dfc87ab0c316 or later.  It can be
    939  1.11  mrg automatically built together with GCC.  For this, add a symbolic link
    940  1.11  mrg to nvptx-newlib&rsquo;s <samp>newlib</samp> directory to the directory containing
    941  1.11  mrg the GCC sources.
    942  1.11  mrg </p>
    943  1.11  mrg <p>Use the <samp>--disable-sjlj-exceptions</samp> and
    944  1.11  mrg <samp>--enable-newlib-io-long-long</samp> options when configuring.
    945  1.11  mrg </p>
    946  1.11  mrg <hr />
    947  1.13  mrg <span id="or1k-x-elf"></span><span id="or1k-*-elf"></span><h3 class="heading">or1k-*-elf</h3>
    948  1.12  mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    949  1.12  mrg This configuration is intended for embedded systems.
    950  1.12  mrg </p>
    951  1.12  mrg <hr />
    952  1.13  mrg <span id="or1k-x-linux"></span><span id="or1k-*-linux"></span><h3 class="heading">or1k-*-linux</h3>
    953  1.12  mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    954  1.12  mrg </p>
    955  1.12  mrg <hr />
    956  1.13  mrg <span id="powerpc-x-x"></span><span id="powerpc-*-*"></span><h3 class="heading">powerpc-*-*</h3>
    957  1.11  mrg <p>You can specify a default version for the <samp>-mcpu=<var>cpu_type</var></samp>
    958  1.11  mrg switch by using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    959  1.11  mrg </p>
    960  1.13  mrg <p>You will need GNU binutils 2.20 or newer.
    961  1.11  mrg </p>
    962  1.11  mrg <hr />
    963  1.13  mrg <span id="powerpc-x-darwin"></span><span id="powerpc-*-darwin*"></span><h3 class="heading">powerpc-*-darwin*</h3>
    964   1.1  mrg <p>PowerPC running Darwin (Mac OS X kernel).
    965  1.11  mrg </p>
    966  1.11  mrg <p>Pre-installed versions of Mac OS X may not include any developer tools,
    967   1.1  mrg meaning that you will not be able to build GCC from source.  Tool
    968   1.1  mrg binaries are available at
    969  1.10  mrg <a href="https://opensource.apple.com">https://opensource.apple.com</a>.
    970  1.11  mrg </p>
    971  1.11  mrg <p>This version of GCC requires at least cctools-590.36.  The
    972   1.1  mrg cctools-590.36 package referenced from
    973   1.1  mrg <a href="http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html">http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html</a> will not work
    974   1.1  mrg on systems older than 10.3.9 (aka darwin7.9.0).
    975  1.11  mrg </p>
    976  1.11  mrg <hr />
    977  1.13  mrg <span id="powerpc-x-elf"></span><span id="powerpc-*-elf"></span><h3 class="heading">powerpc-*-elf</h3>
    978   1.1  mrg <p>PowerPC system in big endian mode, running System V.4.
    979  1.11  mrg </p>
    980  1.11  mrg <hr />
    981  1.13  mrg <span id="powerpc-x-linux-gnu"></span><span id="powerpc*-*-linux-gnu*"></span><h3 class="heading">powerpc*-*-linux-gnu*</h3>
    982   1.1  mrg <p>PowerPC system in big endian mode running Linux.
    983  1.11  mrg </p>
    984  1.11  mrg <hr />
    985  1.13  mrg <span id="powerpc-x-netbsd"></span><span id="powerpc-*-netbsd*"></span><h3 class="heading">powerpc-*-netbsd*</h3>
    986   1.1  mrg <p>PowerPC system in big endian mode running NetBSD.
    987  1.11  mrg </p>
    988  1.11  mrg <hr />
    989  1.13  mrg <span id="powerpc-x-eabisim"></span><span id="powerpc-*-eabisim"></span><h3 class="heading">powerpc-*-eabisim</h3>
    990   1.1  mrg <p>Embedded PowerPC system in big endian mode for use in running under the
    991   1.1  mrg PSIM simulator.
    992  1.11  mrg </p>
    993  1.11  mrg <hr />
    994  1.13  mrg <span id="powerpc-x-eabi"></span><span id="powerpc-*-eabi"></span><h3 class="heading">powerpc-*-eabi</h3>
    995   1.1  mrg <p>Embedded PowerPC system in big endian mode.
    996  1.11  mrg </p>
    997  1.11  mrg <hr />
    998  1.13  mrg <span id="powerpcle-x-elf"></span><span id="powerpcle-*-elf"></span><h3 class="heading">powerpcle-*-elf</h3>
    999   1.1  mrg <p>PowerPC system in little endian mode, running System V.4.
   1000  1.11  mrg </p>
   1001  1.11  mrg <hr />
   1002  1.13  mrg <span id="powerpcle-x-eabisim"></span><span id="powerpcle-*-eabisim"></span><h3 class="heading">powerpcle-*-eabisim</h3>
   1003   1.1  mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1004   1.1  mrg the PSIM simulator.
   1005  1.11  mrg </p>
   1006  1.11  mrg <hr />
   1007  1.13  mrg <span id="powerpcle-x-eabi"></span><span id="powerpcle-*-eabi"></span><h3 class="heading">powerpcle-*-eabi</h3>
   1008   1.1  mrg <p>Embedded PowerPC system in little endian mode.
   1009  1.11  mrg </p>
   1010  1.11  mrg <hr />
   1011  1.13  mrg <span id="rl78-x-elf"></span><span id="rl78-*-elf"></span><h3 class="heading">rl78-*-elf</h3>
   1012  1.11  mrg <p>The Renesas RL78 processor.
   1013  1.11  mrg This configuration is intended for embedded systems.
   1014  1.11  mrg </p>
   1015  1.11  mrg <hr />
   1016  1.13  mrg <span id="riscv32-x-elf"></span><span id="riscv32-*-elf"></span><h3 class="heading">riscv32-*-elf</h3>
   1017  1.11  mrg <p>The RISC-V RV32 instruction set.
   1018   1.3  mrg This configuration is intended for embedded systems.
   1019  1.13  mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1020  1.11  mrg </p>
   1021  1.11  mrg <hr />
   1022  1.13  mrg <span id="riscv32-x-linux"></span><span id="riscv32-*-linux"></span><h3 class="heading">riscv32-*-linux</h3>
   1023  1.11  mrg <p>The RISC-V RV32 instruction set running GNU/Linux.
   1024  1.13  mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1025  1.11  mrg </p>
   1026  1.11  mrg <hr />
   1027  1.13  mrg <span id="riscv64-x-elf"></span><span id="riscv64-*-elf"></span><h3 class="heading">riscv64-*-elf</h3>
   1028  1.11  mrg <p>The RISC-V RV64 instruction set.
   1029  1.11  mrg This configuration is intended for embedded systems.
   1030  1.13  mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1031  1.11  mrg </p>
   1032  1.11  mrg <hr />
   1033  1.13  mrg <span id="riscv64-x-linux"></span><span id="riscv64-*-linux"></span><h3 class="heading">riscv64-*-linux</h3>
   1034  1.11  mrg <p>The RISC-V RV64 instruction set running GNU/Linux.
   1035  1.13  mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1036  1.11  mrg </p>
   1037  1.11  mrg <hr />
   1038  1.13  mrg <span id="rx-x-elf"></span><span id="rx-*-elf"></span><h3 class="heading">rx-*-elf</h3>
   1039  1.10  mrg <p>The Renesas RX processor.
   1040  1.11  mrg </p>
   1041  1.11  mrg <hr />
   1042  1.13  mrg <span id="s390-x-linux"></span><span id="s390-*-linux*"></span><h3 class="heading">s390-*-linux*</h3>
   1043   1.1  mrg <p>S/390 system running GNU/Linux for S/390.
   1044  1.11  mrg </p>
   1045  1.11  mrg <hr />
   1046  1.13  mrg <span id="s390x-x-linux"></span><span id="s390x-*-linux*"></span><h3 class="heading">s390x-*-linux*</h3>
   1047   1.1  mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1048  1.11  mrg </p>
   1049  1.11  mrg <hr />
   1050  1.13  mrg <span id="s390x-ibm-tpf"></span><span id="s390x-ibm-tpf*"></span><h3 class="heading">s390x-ibm-tpf*</h3>
   1051   1.1  mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1052   1.1  mrg supported as cross-compilation target only.
   1053  1.11  mrg </p>
   1054  1.11  mrg <hr />
   1055  1.13  mrg <span id="x-x-solaris2"></span><span id="g_t*-*-solaris2*"></span><h3 class="heading">*-*-solaris2*</h3>
   1056  1.13  mrg <p>Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
   1057  1.13  mrg 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
   1058  1.13  mrg GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
   1059  1.13  mrg </p>
   1060  1.13  mrg <p>Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1061  1.13  mrg <code>/usr/gcc/4.5/bin/gcc</code> or similar.  Newer Solaris versions
   1062  1.13  mrg provide one or more of GCC 5, 7, and 9.  Alternatively,
   1063   1.1  mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1064   1.1  mrg <a href="binaries.html">binaries page</a> for details.
   1065  1.11  mrg </p>
   1066  1.11  mrg <p>The Solaris 2 <code>/bin/sh</code> will often fail to configure
   1067  1.13  mrg &lsquo;<samp>libstdc++-v3</samp>&rsquo;.  We therefore recommend using the
   1068  1.10  mrg following initial sequence of commands
   1069  1.11  mrg </p>
   1070  1.13  mrg <div class="example">
   1071  1.13  mrg <pre class="example">% CONFIG_SHELL=/bin/ksh
   1072  1.11  mrg % export CONFIG_SHELL
   1073  1.11  mrg </pre></div>
   1074  1.10  mrg 
   1075  1.11  mrg <p>and proceed as described in <a href="configure.html">the configure instructions</a>.
   1076   1.1  mrg In addition we strongly recommend specifying an absolute path to invoke
   1077  1.11  mrg <code><var>srcdir</var>/configure</code>.
   1078  1.11  mrg </p>
   1079  1.13  mrg <p>In Solaris 11, you need to check for <code>system/header</code>,
   1080  1.13  mrg <code>system/linker</code>, and <code>developer/assembler</code> packages.
   1081  1.11  mrg </p>
   1082  1.11  mrg <p>Trying to use the linker and other tools in
   1083  1.11  mrg <samp>/usr/ucb</samp> to install GCC has been observed to cause trouble.
   1084   1.1  mrg For example, the linker may hang indefinitely.  The fix is to remove
   1085  1.11  mrg <samp>/usr/ucb</samp> from your <code>PATH</code>.
   1086  1.11  mrg </p>
   1087  1.13  mrg <p>The build process works more smoothly with the legacy Solaris tools so, if you
   1088  1.11  mrg have <samp>/usr/xpg4/bin</samp> in your <code>PATH</code>, we recommend that you place
   1089  1.11  mrg <samp>/usr/bin</samp> before <samp>/usr/xpg4/bin</samp> for the duration of the build.
   1090  1.11  mrg </p>
   1091  1.11  mrg <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1092  1.11  mrg conjunction with the Solaris linker.  The GNU <code>as</code>
   1093  1.13  mrg versions included in Solaris 11.3,
   1094  1.13  mrg from GNU binutils 2.23.1 or newer (in <samp>/usr/bin/gas</samp> and
   1095  1.11  mrg <samp>/usr/gnu/bin/as</samp>), are known to work.
   1096  1.13  mrg The current version, from GNU binutils 2.34,
   1097  1.11  mrg is known to work as well.  Note that your mileage may vary
   1098   1.7  mrg if you use a combination of the GNU tools and the Solaris tools: while the
   1099  1.13  mrg combination GNU <code>as</code> + Solaris <code>ld</code> should reasonably work,
   1100  1.13  mrg the reverse combination Solaris <code>as</code> + GNU <code>ld</code> may fail to
   1101  1.11  mrg build or cause memory corruption at runtime in some cases for C++ programs.
   1102  1.13  mrg GNU <code>ld</code> usually works as well.  Again, the current
   1103  1.13  mrg version (2.34) is known to work, but generally lacks platform specific
   1104  1.11  mrg features, so better stay with Solaris <code>ld</code>.  To use the LTO linker
   1105  1.11  mrg plugin (<samp>-fuse-linker-plugin</samp>) with GNU <code>ld</code>, GNU
   1106  1.11  mrg binutils <em>must</em> be configured with <samp>--enable-largefile</samp>.
   1107  1.11  mrg </p>
   1108  1.11  mrg <p>To enable symbol versioning in &lsquo;<samp>libstdc++</samp>&rsquo; with the Solaris linker,
   1109  1.11  mrg you need to have any version of GNU <code>c++filt</code>, which is part of
   1110  1.11  mrg GNU binutils.  &lsquo;<samp>libstdc++</samp>&rsquo; symbol versioning will be disabled if no
   1111  1.11  mrg appropriate version is found.  Solaris <code>c++filt</code> from the Solaris
   1112   1.7  mrg Studio compilers does <em>not</em> work.
   1113  1.11  mrg </p>
   1114  1.13  mrg <p>The versions of the GNU Multiple Precision Library (GMP), the MPFR
   1115  1.13  mrg library and the MPC library bundled with Solaris 11.3 and later are
   1116  1.13  mrg usually recent enough to match GCC&rsquo;s requirements.  There are two
   1117  1.13  mrg caveats:
   1118  1.11  mrg </p>
   1119  1.13  mrg <ul>
   1120  1.13  mrg <li> While the version of the GMP library in Solaris 11.3 works with GCC, you
   1121  1.13  mrg need to configure with <samp>--with-gmp-include=/usr/include/gmp</samp>.
   1122  1.13  mrg 
   1123  1.13  mrg </li><li> The version of the MPFR libary included in Solaris 11.3 is too old; you
   1124  1.13  mrg need to provide a more recent one.
   1125  1.13  mrg </li></ul>
   1126  1.13  mrg 
   1127  1.11  mrg <hr />
   1128  1.13  mrg <span id="sparc-x-x"></span><span id="sparc*-*-*"></span><h3 class="heading">sparc*-*-*</h3>
   1129   1.3  mrg <p>This section contains general configuration information for all
   1130   1.3  mrg SPARC-based platforms.  In addition to reading this section, please
   1131   1.3  mrg read all other sections that match your target.
   1132  1.11  mrg </p>
   1133  1.11  mrg <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1134   1.3  mrg library and the MPC library are known to be miscompiled by earlier
   1135   1.3  mrg versions of GCC on these platforms.  We therefore recommend the use
   1136   1.3  mrg of the exact versions of these libraries listed as minimal versions
   1137   1.3  mrg in <a href="prerequisites.html">the prerequisites</a>.
   1138  1.11  mrg </p>
   1139  1.11  mrg <hr />
   1140  1.13  mrg <span id="sparc-sun-solaris2"></span><span id="sparc-sun-solaris2*"></span><h3 class="heading">sparc-sun-solaris2*</h3>
   1141   1.1  mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1142  1.13  mrg produced are smaller than the ones produced using Solaris native tools;
   1143   1.1  mrg this difference is quite significant for binaries containing debugging
   1144   1.1  mrg information.
   1145  1.11  mrg </p>
   1146  1.11  mrg <p>Starting with Solaris 7, the operating system is capable of executing
   1147   1.1  mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1148  1.11  mrg this; the <samp>-m64</samp> option enables 64-bit code generation.
   1149   1.1  mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1150  1.11  mrg should try the <samp>-mtune=ultrasparc</samp> option instead, which produces
   1151   1.1  mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1152   1.1  mrg machines.
   1153  1.11  mrg </p>
   1154  1.11  mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1155   1.3  mrg library or the MPC library on a Solaris 7 or later system, the canonical
   1156  1.11  mrg target triplet must be specified as the <code>build</code> parameter on the
   1157  1.11  mrg configure line.  This target triplet can be obtained by invoking <code>./config.guess</code> in the toplevel source directory of GCC (and
   1158  1.13  mrg not that of GMP or MPFR or MPC).  For example on a Solaris 11 system:
   1159  1.11  mrg </p>
   1160  1.13  mrg <div class="example">
   1161  1.13  mrg <pre class="example">% ./configure --build=sparc-sun-solaris2.11 --prefix=xxx
   1162  1.11  mrg </pre></div>
   1163  1.11  mrg 
   1164  1.11  mrg <hr />
   1165  1.13  mrg <span id="sparc-x-linux"></span><span id="sparc-*-linux*"></span><h3 class="heading">sparc-*-linux*</h3>
   1166  1.11  mrg 
   1167  1.13  mrg <hr />
   1168  1.13  mrg <span id="sparc64-x-solaris2"></span><span id="sparc64-*-solaris2*"></span><h3 class="heading">sparc64-*-solaris2*</h3>
   1169  1.13  mrg <p>When configuring a 64-bit-default GCC on Solaris/SPARC, you must use a
   1170  1.13  mrg build compiler that generates 64-bit code, either by default or by
   1171  1.13  mrg specifying &lsquo;<samp>CC='gcc -m64' CXX='gcc-m64'</samp>&rsquo; to <code>configure</code>.
   1172  1.13  mrg Additionally, you <em>must</em> pass <samp>--build=sparc64-sun-solaris2.11</samp>
   1173  1.13  mrg or <samp>--build=sparcv9-sun-solaris2.11</samp> because <samp>config.guess</samp>
   1174  1.13  mrg misdetects this situation, which can cause build failures.
   1175  1.11  mrg </p>
   1176   1.3  mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1177   1.3  mrg library or the MPC library, the canonical target triplet must be specified
   1178  1.11  mrg as the <code>build</code> parameter on the configure line.  For example
   1179  1.13  mrg on a Solaris 11 system:
   1180  1.11  mrg </p>
   1181  1.13  mrg <div class="example">
   1182  1.13  mrg <pre class="example">% ./configure --build=sparc64-sun-solaris2.11 --prefix=xxx
   1183  1.11  mrg </pre></div>
   1184  1.11  mrg 
   1185  1.11  mrg <hr />
   1186  1.13  mrg <span id="sparcv9-x-solaris2"></span><span id="sparcv9-*-solaris2*"></span><h3 class="heading">sparcv9-*-solaris2*</h3>
   1187  1.11  mrg <p>This is a synonym for &lsquo;<samp>sparc64-*-solaris2*</samp>&rsquo;.
   1188  1.11  mrg </p>
   1189  1.11  mrg <hr />
   1190  1.13  mrg <span id="c6x-x-x"></span><span id="c6x-*-*"></span><h3 class="heading">c6x-*-*</h3>
   1191   1.3  mrg <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1192  1.11  mrg </p>
   1193  1.11  mrg <hr />
   1194  1.13  mrg <span id="tilegx-*-linux"></span><span id="tilegx-*-linux*"></span><h3 class="heading">tilegx-*-linux*</h3>
   1195   1.5  mrg <p>The TILE-Gx processor in little endian mode, running GNU/Linux.  This
   1196   1.5  mrg port requires binutils-2.22 or newer.
   1197  1.11  mrg </p>
   1198  1.11  mrg <hr />
   1199  1.13  mrg <span id="tilegxbe-*-linux"></span><span id="tilegxbe-*-linux*"></span><h3 class="heading">tilegxbe-*-linux*</h3>
   1200   1.5  mrg <p>The TILE-Gx processor in big endian mode, running GNU/Linux.  This
   1201   1.5  mrg port requires binutils-2.23 or newer.
   1202  1.11  mrg </p>
   1203  1.11  mrg <hr />
   1204  1.13  mrg <span id="tilepro-*-linux"></span><span id="tilepro-*-linux*"></span><h3 class="heading">tilepro-*-linux*</h3>
   1205   1.3  mrg <p>The TILEPro processor running GNU/Linux.  This port requires
   1206   1.3  mrg binutils-2.22 or newer.
   1207  1.11  mrg </p>
   1208  1.11  mrg <hr />
   1209  1.13  mrg <span id="visium-x-elf"></span><span id="visium-*-elf"></span><h3 class="heading">visium-*-elf</h3>
   1210  1.11  mrg <p>CDS VISIUMcore processor.
   1211   1.5  mrg This configuration is intended for embedded systems.
   1212  1.11  mrg </p>
   1213  1.11  mrg <hr />
   1214  1.13  mrg <span id="x-x-vxworks"></span><span id="g_t*-*-vxworks*"></span><h3 class="heading">*-*-vxworks*</h3>
   1215   1.1  mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1216  1.11  mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC.
   1217  1.11  mrg We welcome patches for other architectures supported by VxWorks 5.5.
   1218   1.1  mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1219   1.1  mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1220   1.1  mrg not interested in supporting older, a.out or COFF-based, versions of
   1221   1.1  mrg VxWorks in GCC 3.
   1222  1.11  mrg </p>
   1223  1.11  mrg <p>VxWorks comes with an older version of GCC installed in
   1224  1.11  mrg <samp><var>$WIND_BASE</var>/host</samp>; we recommend you do not overwrite it.
   1225  1.11  mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>.
   1226  1.11  mrg Before running <code>configure</code>, create the directories <samp><var>prefix</var></samp>
   1227  1.11  mrg and <samp><var>prefix</var>/bin</samp>.  Link or copy the appropriate assembler,
   1228  1.11  mrg linker, etc. into <samp><var>prefix</var>/bin</samp>, and set your <var>PATH</var> to
   1229  1.11  mrg include that directory while running both <code>configure</code> and
   1230  1.11  mrg <code>make</code>.
   1231  1.11  mrg </p>
   1232  1.11  mrg <p>You must give <code>configure</code> the
   1233  1.11  mrg <samp>--with-headers=<var>$WIND_BASE</var>/target/h</samp> switch so that it can
   1234   1.1  mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1235  1.11  mrg target only, you must also specify <samp>--target=<var>target</var></samp>.
   1236  1.11  mrg <code>configure</code> will attempt to create the directory
   1237  1.11  mrg <samp><var>prefix</var>/<var>target</var>/sys-include</samp> and copy files into it;
   1238  1.11  mrg make sure the user running <code>configure</code> has sufficient privilege
   1239   1.1  mrg to do so.
   1240  1.11  mrg </p>
   1241  1.11  mrg <p>GCC&rsquo;s exception handling runtime requires a special &ldquo;configlette&rdquo;
   1242  1.11  mrg module, <samp>contrib/gthr_supp_vxw_5x.c</samp>.  Follow the instructions in
   1243   1.1  mrg that file to add the module to your kernel build.  (Future versions of
   1244   1.1  mrg VxWorks will incorporate this module.)
   1245  1.11  mrg </p>
   1246  1.11  mrg <hr />
   1247  1.13  mrg <span id="x86-64-x-x"></span><span id="x86_005f64-*-*_002c-amd64-*-*"></span><h3 class="heading">x86_64-*-*, amd64-*-*</h3>
   1248   1.1  mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1249  1.11  mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD.
   1250   1.1  mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1251  1.11  mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp>-m32</samp> switch).
   1252  1.11  mrg </p>
   1253  1.11  mrg <hr />
   1254  1.13  mrg <span id="x86-64-x-solaris2"></span><span id="x86_005f64-*-solaris2*"></span><h3 class="heading">x86_64-*-solaris2*</h3>
   1255   1.3  mrg <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1256  1.11  mrg processor (&lsquo;<samp>amd64-*-*</samp>&rsquo; is an alias for &lsquo;<samp>x86_64-*-*</samp>&rsquo;) on
   1257   1.3  mrg Solaris 10 or later.  Unlike other systems, without special options a
   1258   1.3  mrg bi-arch compiler is built which generates 32-bit code by default, but
   1259  1.11  mrg can generate 64-bit x86-64 code with the <samp>-m64</samp> switch.  Since
   1260   1.7  mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1261  1.11  mrg can generate 32-bit code with <samp>-m32</samp>.  To configure and build
   1262  1.11  mrg this way, you have to provide all support libraries like <samp>libgmp</samp>
   1263  1.13  mrg as 64-bit code, configure with <samp>--target=x86_64-pc-solaris2.11</samp>
   1264  1.11  mrg and &lsquo;<samp>CC=gcc -m64</samp>&rsquo;.
   1265  1.11  mrg </p>
   1266  1.11  mrg <hr />
   1267  1.13  mrg <span id="xtensa-x-elf"></span><span id="xtensa*-*-elf"></span><h3 class="heading">xtensa*-*-elf</h3>
   1268   1.1  mrg <p>This target is intended for embedded Xtensa systems using the
   1269  1.11  mrg &lsquo;<samp>newlib</samp>&rsquo; C library.  It uses ELF but does not support shared
   1270   1.1  mrg objects.  Designed-defined instructions specified via the
   1271   1.1  mrg Tensilica Instruction Extension (TIE) language are only supported
   1272   1.1  mrg through inline assembly.
   1273  1.11  mrg </p>
   1274  1.11  mrg <p>The Xtensa configuration information must be specified prior to
   1275  1.11  mrg building GCC.  The <samp>include/xtensa-config.h</samp> header
   1276   1.1  mrg file contains the configuration information.  If you created your
   1277   1.1  mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1278   1.1  mrg downloaded files include a customized copy of this header file,
   1279   1.1  mrg which you can use to replace the default header file.
   1280  1.11  mrg </p>
   1281  1.11  mrg <hr />
   1282  1.13  mrg <span id="xtensa-x-linux"></span><span id="xtensa*-*-linux*"></span><h3 class="heading">xtensa*-*-linux*</h3>
   1283   1.1  mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1284   1.1  mrg shared objects and the GNU C library (glibc).  It also generates
   1285   1.1  mrg position-independent code (PIC) regardless of whether the
   1286  1.11  mrg <samp>-fpic</samp> or <samp>-fPIC</samp> options are used.  In other
   1287   1.1  mrg respects, this target is the same as the
   1288  1.11  mrg <a href="#xtensa*-*-elf">&lsquo;<samp>xtensa*-*-elf</samp>&rsquo;</a> target.
   1289  1.11  mrg </p>
   1290  1.11  mrg <hr />
   1291  1.13  mrg <span id="windows"></span><span id="Microsoft-Windows"></span><h3 class="heading">Microsoft Windows</h3>
   1292   1.1  mrg 
   1293  1.13  mrg <span id="Intel-16-bit-versions"></span><h4 class="subheading">Intel 16-bit versions</h4>
   1294   1.1  mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1295   1.1  mrg supported.
   1296  1.11  mrg </p>
   1297  1.11  mrg <p>However, the 32-bit port has limited support for Microsoft
   1298   1.1  mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1299  1.11  mrg </p>
   1300  1.13  mrg <span id="Intel-32-bit-versions"></span><h4 class="subheading">Intel 32-bit versions</h4>
   1301   1.1  mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1302   1.1  mrg XP, and Windows Vista, are supported by several different target
   1303   1.1  mrg platforms.  These targets differ in which Windows subsystem they target
   1304   1.1  mrg and which C libraries are used.
   1305  1.11  mrg </p>
   1306  1.11  mrg <ul>
   1307  1.11  mrg <li> Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1308  1.11  mrg Linux API emulation layer in the Win32 subsystem.
   1309  1.11  mrg </li><li> MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1310  1.11  mrg the Win32 subsystem that provides a subset of POSIX.
   1311  1.11  mrg </li><li> MKS i386-pc-mks: NuTCracker from MKS.  See
   1312  1.11  mrg <a href="https://www.mkssoftware.com">https://www.mkssoftware.com</a> for more information.
   1313  1.11  mrg </li></ul>
   1314   1.1  mrg 
   1315  1.13  mrg <span id="Intel-64-bit-versions"></span><h4 class="subheading">Intel 64-bit versions</h4>
   1316   1.1  mrg <p>GCC contains support for x86-64 using the mingw-w64
   1317  1.11  mrg runtime library, available from <a href="http://mingw-w64.org/doku.php">http://mingw-w64.org/doku.php</a>.
   1318   1.1  mrg This library should be used with the target triple x86_64-pc-mingw32.
   1319  1.11  mrg </p>
   1320  1.11  mrg <p>Presently Windows for Itanium is not supported.
   1321  1.11  mrg </p>
   1322  1.13  mrg <span id="Windows-CE"></span><h4 class="subheading">Windows CE</h4>
   1323   1.3  mrg <p>Windows CE is supported as a target only on Hitachi
   1324   1.1  mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1325  1.11  mrg </p>
   1326  1.13  mrg <span id="Other-Windows-Platforms"></span><h4 class="subheading">Other Windows Platforms</h4>
   1327   1.1  mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1328  1.11  mrg </p>
   1329  1.11  mrg <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1330   1.1  mrg support the Interix subsystem.  See above.
   1331  1.11  mrg </p>
   1332  1.11  mrg <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1333  1.11  mrg </p>
   1334  1.11  mrg <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1335   1.1  mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1336  1.11  mrg </p>
   1337  1.11  mrg <p>UWIN support has been removed due to a lack of maintenance.
   1338  1.11  mrg </p>
   1339  1.11  mrg <hr />
   1340  1.13  mrg <span id="x-x-cygwin"></span><span id="g_t*-*-cygwin"></span><h3 class="heading">*-*-cygwin</h3>
   1341   1.1  mrg <p>Ports of GCC are included with the
   1342   1.1  mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1343  1.11  mrg </p>
   1344  1.11  mrg <p>GCC will build under Cygwin without modification; it does not build
   1345  1.11  mrg with Microsoft&rsquo;s C++ compiler and there are no plans to make it do so.
   1346  1.11  mrg </p>
   1347  1.11  mrg <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1348   1.1  mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1349   1.1  mrg used with as up-to-date a version of binutils as possible; use either
   1350   1.1  mrg the latest official GNU binutils release in the Cygwin distribution,
   1351   1.1  mrg or version 2.20 or above if building your own.
   1352  1.11  mrg </p>
   1353  1.11  mrg <hr />
   1354  1.13  mrg <span id="x-x-mingw32"></span><span id="g_t*-*-mingw32"></span><h3 class="heading">*-*-mingw32</h3>
   1355  1.11  mrg <p>GCC will build with and support only MinGW runtime 3.12 and later.
   1356   1.1  mrg Earlier versions of headers are incompatible with the new default semantics
   1357   1.1  mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1358  1.11  mrg </p>
   1359  1.11  mrg <hr />
   1360  1.13  mrg <span id="older"></span><span id="Older-systems"></span><h3 class="heading">Older systems</h3>
   1361   1.1  mrg <p>GCC contains support files for many older (1980s and early
   1362   1.1  mrg 1990s) Unix variants.  For the most part, support for these systems
   1363   1.1  mrg has not been deliberately removed, but it has not been maintained for
   1364   1.1  mrg several years and may suffer from bitrot.
   1365  1.11  mrg </p>
   1366  1.11  mrg <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems.
   1367   1.1  mrg Support for these systems is still present in that release, but
   1368  1.11  mrg <code>configure</code> will fail unless the <samp>--enable-obsolete</samp>
   1369   1.1  mrg option is given.  Unless a maintainer steps forward, support for these
   1370   1.1  mrg systems will be removed from the next release of GCC.
   1371  1.11  mrg </p>
   1372  1.11  mrg <p>Support for old systems as hosts for GCC can cause problems if the
   1373   1.1  mrg workarounds for compiler, library and operating system bugs affect the
   1374   1.1  mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1375   1.1  mrg bring GCC up on such a system, if still possible with current GCC, may
   1376   1.1  mrg require first installing an old version of GCC which did work on that
   1377   1.1  mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1378   1.1  mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1379  1.11  mrg <samp>old-releases</samp> directory on the <a href="../mirrors.html">GCC mirror
   1380  1.11  mrg sites</a>.  Header bugs may generally be avoided using
   1381  1.11  mrg <code>fixincludes</code>, but bugs or deficiencies in libraries and the
   1382   1.1  mrg operating system may still cause problems.
   1383  1.11  mrg </p>
   1384  1.11  mrg <p>Support for older systems as targets for cross-compilation is less
   1385   1.1  mrg problematic than support for them as hosts for GCC; if an enthusiast
   1386   1.1  mrg wishes to make such a target work again (including resurrecting any of
   1387   1.1  mrg the targets that never worked with GCC 2, starting from the last
   1388   1.1  mrg version before they were removed), patches
   1389   1.1  mrg <a href="../contribute.html">following the usual requirements</a> would be
   1390   1.1  mrg likely to be accepted, since they should not affect the support for more
   1391   1.1  mrg modern targets.
   1392  1.11  mrg </p>
   1393  1.11  mrg <p>For some systems, old versions of GNU binutils may also be useful,
   1394  1.11  mrg and are available from <samp>pub/binutils/old-releases</samp> on
   1395  1.10  mrg <a href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1396  1.11  mrg </p>
   1397  1.11  mrg <p>Some of the information on specific systems above relates to
   1398   1.1  mrg such older systems, but much of the information
   1399   1.1  mrg about GCC on such systems (which may no longer be applicable to
   1400   1.1  mrg current GCC) is to be found in the GCC texinfo manual.
   1401  1.11  mrg </p>
   1402  1.11  mrg <hr />
   1403  1.13  mrg <span id="elf"></span><span id="all-ELF-targets-_0028SVR4_002c-Solaris-2_002c-etc_002e_0029"></span><h3 class="heading">all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1404   1.1  mrg <p>C++ support is significantly better on ELF targets if you use the
   1405   1.1  mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1406   1.1  mrg inlines, vtables and template instantiations will be discarded
   1407   1.1  mrg automatically.
   1408  1.11  mrg </p>
   1409   1.1  mrg 
   1410  1.11  mrg <hr />
   1411  1.11  mrg <p>
   1412   1.1  mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1413  1.11  mrg </p>
   1414  1.11  mrg 
   1415  1.11  mrg 
   1416  1.11  mrg 
   1417  1.11  mrg 
   1418   1.1  mrg 
   1419   1.1  mrg 
   1420  1.11  mrg </body>
   1421  1.11  mrg </html>
   1422