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     25  1.12    mrg <title>Host/Target specific installation notes for GCC</title>
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     61   1.9    mrg </head>
     62   1.8    mrg 
     63  1.10    mrg <body lang="en">
     64  1.12    mrg <h1 class="settitle" align="center">Host/Target specific installation notes for GCC</h1>
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     88   1.8    mrg 
     89  1.10    mrg <a name="index-Specific"></a>
     90  1.10    mrg <a name="index-Specific-installation-notes"></a>
     91  1.10    mrg <a name="index-Target-specific-installation"></a>
     92  1.10    mrg <a name="index-Host-specific-installation"></a>
     93  1.10    mrg <a name="index-Target-specific-installation-notes"></a>
     94   1.6    mrg 
     95  1.10    mrg <p>Please read this document carefully <em>before</em> installing the
     96  1.10    mrg GNU Compiler Collection on your machine.
     97  1.10    mrg </p>
     98  1.10    mrg <p>Note that this list of install notes is <em>not</em> a list of supported
     99  1.10    mrg hosts or targets.  Not all supported hosts and targets are listed
    100  1.10    mrg here, only the ones that require host-specific or target-specific
    101  1.10    mrg information have to. 
    102  1.10    mrg </p>
    103  1.10    mrg <ul>
    104  1.10    mrg <li> <a href="#aarch64-x-x">aarch64*-*-*</a>
    105  1.10    mrg </li><li> <a href="#alpha-x-x">alpha*-*-*</a>
    106  1.12    mrg </li><li> <a href="#amd64-x-solaris2">amd64-*-solaris2*</a>
    107  1.10    mrg </li><li> <a href="#arm-x-eabi">arm-*-eabi</a>
    108  1.10    mrg </li><li> <a href="#avr">avr</a>
    109  1.10    mrg </li><li> <a href="#bfin">Blackfin</a>
    110  1.10    mrg </li><li> <a href="#dos">DOS</a>
    111  1.10    mrg </li><li> <a href="#x-x-freebsd">*-*-freebsd*</a>
    112  1.10    mrg </li><li> <a href="#h8300-hms">h8300-hms</a>
    113  1.10    mrg </li><li> <a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
    114  1.10    mrg </li><li> <a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
    115  1.10    mrg </li><li> <a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
    116  1.10    mrg </li><li> <a href="#x-x-linux-gnu">*-*-linux-gnu</a>
    117  1.10    mrg </li><li> <a href="#ix86-x-linux">i?86-*-linux*</a>
    118  1.12    mrg </li><li> <a href="#ix86-x-solaris2">i?86-*-solaris2*</a>
    119  1.10    mrg </li><li> <a href="#ia64-x-linux">ia64-*-linux</a>
    120  1.10    mrg </li><li> <a href="#ia64-x-hpux">ia64-*-hpux*</a>
    121  1.10    mrg </li><li> <a href="#x-ibm-aix">*-ibm-aix*</a>
    122  1.10    mrg </li><li> <a href="#iq2000-x-elf">iq2000-*-elf</a>
    123  1.10    mrg </li><li> <a href="#lm32-x-elf">lm32-*-elf</a>
    124  1.10    mrg </li><li> <a href="#lm32-x-uclinux">lm32-*-uclinux</a>
    125  1.10    mrg </li><li> <a href="#m32c-x-elf">m32c-*-elf</a>
    126  1.10    mrg </li><li> <a href="#m32r-x-elf">m32r-*-elf</a>
    127  1.10    mrg </li><li> <a href="#m68k-x-x">m68k-*-*</a>
    128  1.10    mrg </li><li> <a href="#m68k-uclinux">m68k-uclinux</a>
    129  1.10    mrg </li><li> <a href="#microblaze-x-elf">microblaze-*-elf</a>
    130  1.10    mrg </li><li> <a href="#mips-x-x">mips-*-*</a>
    131  1.10    mrg </li><li> <a href="#nds32le-x-elf">nds32le-*-elf</a>
    132  1.10    mrg </li><li> <a href="#nds32be-x-elf">nds32be-*-elf</a>
    133  1.10    mrg </li><li> <a href="#nvptx-x-none">nvptx-*-none</a>
    134  1.11    mrg </li><li> <a href="#or1k-x-elf">or1k-*-elf</a>
    135  1.11    mrg </li><li> <a href="#or1k-x-linux">or1k-*-linux</a>
    136  1.10    mrg </li><li> <a href="#powerpc-x-x">powerpc*-*-*</a>
    137  1.10    mrg </li><li> <a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
    138  1.10    mrg </li><li> <a href="#powerpc-x-elf">powerpc-*-elf</a>
    139  1.10    mrg </li><li> <a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
    140  1.10    mrg </li><li> <a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
    141  1.10    mrg </li><li> <a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
    142  1.10    mrg </li><li> <a href="#powerpc-x-eabi">powerpc-*-eabi</a>
    143  1.10    mrg </li><li> <a href="#powerpcle-x-elf">powerpcle-*-elf</a>
    144  1.10    mrg </li><li> <a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
    145  1.10    mrg </li><li> <a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
    146  1.10    mrg </li><li> <a href="#riscv32-x-elf">riscv32-*-elf</a>
    147  1.10    mrg </li><li> <a href="#riscv32-x-linux">riscv32-*-linux</a>
    148  1.10    mrg </li><li> <a href="#riscv64-x-elf">riscv64-*-elf</a>
    149  1.10    mrg </li><li> <a href="#riscv64-x-linux">riscv64-*-linux</a>
    150  1.10    mrg </li><li> <a href="#s390-x-linux">s390-*-linux*</a>
    151  1.10    mrg </li><li> <a href="#s390x-x-linux">s390x-*-linux*</a>
    152  1.10    mrg </li><li> <a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    153  1.10    mrg </li><li> <a href="#x-x-solaris2">*-*-solaris2*</a>
    154  1.10    mrg </li><li> <a href="#sparc-x-x">sparc*-*-*</a>
    155  1.10    mrg </li><li> <a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    156  1.10    mrg </li><li> <a href="#sparc-x-linux">sparc-*-linux*</a>
    157  1.10    mrg </li><li> <a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    158  1.10    mrg </li><li> <a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    159  1.10    mrg </li><li> <a href="#c6x-x-x">c6x-*-*</a>
    160  1.10    mrg </li><li> <a href="#tilegx-x-linux">tilegx-*-linux*</a>
    161  1.10    mrg </li><li> <a href="#tilegxbe-x-linux">tilegxbe-*-linux*</a>
    162  1.10    mrg </li><li> <a href="#tilepro-x-linux">tilepro-*-linux*</a>
    163  1.10    mrg </li><li> <a href="#visium-x-elf">visium-*-elf</a>
    164  1.10    mrg </li><li> <a href="#x-x-vxworks">*-*-vxworks*</a>
    165  1.10    mrg </li><li> <a href="#x86-64-x-x">x86_64-*-*, amd64-*-*</a>
    166  1.12    mrg </li><li> <a href="#x86-64-x-solaris2">x86_64-*-solaris2*</a>
    167  1.10    mrg </li><li> <a href="#xtensa-x-elf">xtensa*-*-elf</a>
    168  1.10    mrg </li><li> <a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    169  1.10    mrg </li><li> <a href="#windows">Microsoft Windows</a>
    170  1.10    mrg </li><li> <a href="#x-x-cygwin">*-*-cygwin</a>
    171  1.10    mrg </li><li> <a href="#x-x-mingw32">*-*-mingw32</a>
    172  1.10    mrg </li><li> <a href="#os2">OS/2</a>
    173  1.10    mrg </li><li> <a href="#older">Older systems</a>
    174  1.10    mrg </li></ul>
    175  1.10    mrg 
    176  1.10    mrg <ul>
    177  1.10    mrg <li> <a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.)
    178  1.10    mrg </li></ul>
    179  1.10    mrg 
    180  1.10    mrg 
    181  1.10    mrg <!-- -------- host/target specific issues start here ---------------- -->
    182  1.10    mrg <hr />
    183  1.10    mrg <a name="aarch64-x-x"></a><a name="aarch64*-*-*"></a>
    184  1.10    mrg <h3 class="heading">aarch64*-*-*</h3>
    185  1.10    mrg <p>Binutils pre 2.24 does not have support for selecting <samp>-mabi</samp> and
    186  1.10    mrg does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    187  1.10    mrg not support option <samp>-mabi=ilp32</samp>.
    188  1.10    mrg </p>
    189  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    190  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    191  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> option.  This will enable the fix by
    192  1.10    mrg default and can be explicitly disabled during compilation by passing the
    193  1.10    mrg <samp>-mno-fix-cortex-a53-835769</samp> option.  Conversely,
    194  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> will disable the workaround by
    195  1.10    mrg default.  The workaround is disabled by default if neither of
    196  1.10    mrg <samp>--enable-fix-cortex-a53-835769</samp> or
    197  1.10    mrg <samp>--disable-fix-cortex-a53-835769</samp> is given at configure time.
    198  1.10    mrg </p>
    199  1.10    mrg <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    200  1.10    mrg (for all CPUs regardless of -mcpu option given) at configure time use the
    201  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> option.  This workaround is applied at
    202  1.10    mrg link time.  Enabling the workaround will cause GCC to pass the relevant option
    203  1.10    mrg to the linker.  It can be explicitly disabled during compilation by passing the
    204  1.10    mrg <samp>-mno-fix-cortex-a53-843419</samp> option.  Conversely,
    205  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> will disable the workaround by default.
    206  1.10    mrg The workaround is disabled by default if neither of
    207  1.10    mrg <samp>--enable-fix-cortex-a53-843419</samp> or
    208  1.10    mrg <samp>--disable-fix-cortex-a53-843419</samp> is given at configure time.
    209  1.10    mrg </p>
    210  1.11    mrg <p>To enable Branch Target Identification Mechanism and Return Address Signing by
    211  1.11    mrg default at configure time use the <samp>--enable-standard-branch-protection</samp>
    212  1.11    mrg option.  This is equivalent to having <samp>-mbranch-protection=standard</samp>
    213  1.11    mrg during compilation.  This can be explicitly disabled during compilation by
    214  1.11    mrg passing the <samp>-mbranch-protection=none</samp> option which turns off all
    215  1.11    mrg types of branch protections.  Conversely,
    216  1.11    mrg <samp>--disable-standard-branch-protection</samp> will disable both the
    217  1.11    mrg protections by default.  This mechanism is turned off by default if neither
    218  1.11    mrg of the options are given at configure time.
    219  1.11    mrg </p>
    220  1.10    mrg <hr />
    221  1.10    mrg <a name="alpha-x-x"></a><a name="alpha*-*-*"></a>
    222  1.10    mrg <h3 class="heading">alpha*-*-*</h3>
    223  1.10    mrg <p>This section contains general configuration information for all
    224  1.10    mrg Alpha-based platforms using ELF.  In addition to reading this
    225  1.10    mrg section, please read all other sections that match your target.
    226  1.10    mrg </p>
    227  1.10    mrg <hr />
    228  1.12    mrg <a name="amd64-x-solaris2"></a><a name="amd64-*-solaris2*"></a>
    229  1.12    mrg <h3 class="heading">amd64-*-solaris2*</h3>
    230  1.12    mrg <p>This is a synonym for &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo;.
    231  1.10    mrg </p>
    232  1.10    mrg <hr />
    233  1.12    mrg <a name="amdgcn-x-amdhsa"></a><a name="amdgcn-*-amdhsa"></a>
    234  1.12    mrg <h3 class="heading">amdgcn-*-amdhsa</h3>
    235  1.11    mrg <p>AMD GCN GPU target.
    236  1.11    mrg </p>
    237  1.11    mrg <p>Instead of GNU Binutils, you will need to install LLVM 6, or later, and copy
    238  1.12    mrg <samp>bin/llvm-mc</samp> to <samp>amdgcn-amdhsa/bin/as</samp>,
    239  1.12    mrg <samp>bin/lld</samp> to <samp>amdgcn-amdhsa/bin/ld</samp>,
    240  1.12    mrg <samp>bin/llvm-nm</samp> to <samp>amdgcn-amdhsa/bin/nm</samp>, and
    241  1.12    mrg <samp>bin/llvm-ar</samp> to both <samp>bin/amdgcn-amdhsa-ar</samp> and
    242  1.12    mrg <samp>bin/amdgcn-amdhsa-ranlib</samp>.
    243  1.11    mrg </p>
    244  1.11    mrg <p>Use Newlib (2019-01-16, or newer).
    245  1.11    mrg </p>
    246  1.11    mrg <p>To run the binaries, install the HSA Runtime from the
    247  1.11    mrg <a href="https://rocm.github.io">ROCm Platform</a>, and use
    248  1.12    mrg <samp>libexec/gcc/amdhsa-amdhsa/<var>version</var>/gcn-run</samp> to launch them
    249  1.11    mrg on the GPU.
    250  1.11    mrg </p>
    251  1.11    mrg <hr />
    252  1.10    mrg <a name="arc-x-elf32"></a><a name="arc-*-elf32"></a>
    253  1.10    mrg <h3 class="heading">arc-*-elf32</h3>
    254  1.10    mrg 
    255  1.10    mrg <p>Use &lsquo;<samp>configure --target=arc-elf32 --with-cpu=<var>cpu</var> --enable-languages=&quot;c,c++&quot;</samp>&rsquo;
    256  1.10    mrg to configure GCC, with <var>cpu</var> being one of &lsquo;<samp>arc600</samp>&rsquo;, &lsquo;<samp>arc601</samp>&rsquo;,
    257  1.10    mrg or &lsquo;<samp>arc700</samp>&rsquo;.
    258  1.10    mrg </p>
    259  1.10    mrg <hr />
    260  1.10    mrg <a name="arc-linux-uclibc"></a><a name="arc-linux-uclibc-1"></a>
    261  1.10    mrg <h3 class="heading">arc-linux-uclibc</h3>
    262  1.10    mrg 
    263  1.10    mrg <p>Use &lsquo;<samp>configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages=&quot;c,c++&quot;</samp>&rsquo; to configure GCC.
    264  1.10    mrg </p>
    265  1.10    mrg <hr />
    266  1.10    mrg <a name="arm-x-eabi"></a><a name="arm-*-eabi"></a>
    267  1.10    mrg <h3 class="heading">arm-*-eabi</h3>
    268   1.9    mrg <p>ARM-family processors.
    269  1.10    mrg </p>
    270  1.10    mrg <p>Building the Ada frontend commonly fails (an infinite loop executing
    271   1.7    mrg <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    272   1.7    mrg GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    273  1.10    mrg </p>
    274  1.10    mrg <hr />
    275  1.10    mrg <a name="avr"></a><a name="avr-1"></a>
    276  1.10    mrg <h3 class="heading">avr</h3>
    277   1.1    mrg <p>ATMEL AVR-family micro controllers.  These are used in embedded
    278  1.10    mrg applications.  There are no standard Unix configurations.
    279   1.1    mrg See &ldquo;AVR Options&rdquo; in the main manual
    280   1.1    mrg for the list of supported MCU types.
    281  1.10    mrg </p>
    282  1.10    mrg <p>Use &lsquo;<samp>configure --target=avr --enable-languages=&quot;c&quot;</samp>&rsquo; to configure GCC.
    283  1.10    mrg </p>
    284  1.10    mrg <p>Further installation notes and other useful information about AVR tools
    285   1.1    mrg can also be obtained from:
    286  1.10    mrg </p>
    287  1.10    mrg <ul>
    288  1.10    mrg <li> <a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    289  1.10    mrg </li><li> <a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    290  1.10    mrg </li></ul>
    291  1.10    mrg 
    292  1.10    mrg <p>The following error:
    293  1.10    mrg </p><div class="smallexample">
    294  1.10    mrg <pre class="smallexample">Error: register required
    295  1.10    mrg </pre></div>
    296  1.10    mrg 
    297  1.10    mrg <p>indicates that you should upgrade to a newer version of the binutils.
    298  1.10    mrg </p>
    299  1.10    mrg <hr />
    300  1.10    mrg <a name="bfin"></a><a name="Blackfin"></a>
    301  1.10    mrg <h3 class="heading">Blackfin</h3>
    302  1.10    mrg <p>The Blackfin processor, an Analog Devices DSP.
    303   1.1    mrg See &ldquo;Blackfin Options&rdquo; in the main manual
    304  1.10    mrg </p>
    305  1.10    mrg <p>More information, and a version of binutils with support for this processor,
    306  1.12    mrg are available at <a href="https://sourceforge.net/projects/adi-toolchain/">https://sourceforge.net/projects/adi-toolchain/</a>.
    307  1.10    mrg </p>
    308  1.10    mrg <hr />
    309  1.10    mrg <a name="cr16"></a><a name="CR16"></a>
    310  1.10    mrg <h3 class="heading">CR16</h3>
    311   1.5    mrg <p>The CR16 CompactRISC architecture is a 16-bit architecture. This
    312   1.5    mrg architecture is used in embedded applications.
    313  1.10    mrg </p>
    314   1.3  skrll 
    315  1.10    mrg <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    316  1.10    mrg </p>
    317  1.10    mrg <p>Use &lsquo;<samp>configure --target=cr16-elf --enable-languages=c,c++</samp>&rsquo; to configure
    318  1.10    mrg GCC&nbsp;for building a CR16 elf cross-compiler.
    319  1.10    mrg </p>
    320  1.10    mrg <p>Use &lsquo;<samp>configure --target=cr16-uclinux --enable-languages=c,c++</samp>&rsquo; to
    321  1.10    mrg configure GCC&nbsp;for building a CR16 uclinux cross-compiler.
    322  1.10    mrg </p>
    323  1.10    mrg <hr />
    324  1.10    mrg <a name="cris"></a><a name="CRIS"></a>
    325  1.10    mrg <h3 class="heading">CRIS</h3>
    326   1.1    mrg <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    327   1.1    mrg series.  These are used in embedded applications.
    328  1.10    mrg </p>
    329  1.10    mrg <p>See &ldquo;CRIS Options&rdquo; in the main manual
    330   1.1    mrg for a list of CRIS-specific options.
    331  1.10    mrg </p>
    332  1.10    mrg <p>There are a few different CRIS targets:
    333  1.10    mrg </p><dl compact="compact">
    334  1.10    mrg <dt><code>cris-axis-elf</code></dt>
    335  1.10    mrg <dd><p>Mainly for monolithic embedded systems.  Includes a multilib for the
    336  1.10    mrg &lsquo;<samp>v10</samp>&rsquo; core used in &lsquo;<samp>ETRAX 100 LX</samp>&rsquo;.
    337  1.10    mrg </p></dd>
    338  1.10    mrg <dt><code>cris-axis-linux-gnu</code></dt>
    339  1.10    mrg <dd><p>A GNU/Linux port for the CRIS architecture, currently targeting
    340  1.10    mrg &lsquo;<samp>ETRAX 100 LX</samp>&rsquo; by default.
    341  1.10    mrg </p></dd>
    342   1.1    mrg </dl>
    343   1.1    mrg 
    344  1.10    mrg <p>Pre-packaged tools can be obtained from
    345   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
    346   1.1    mrg information about this platform is available at
    347   1.1    mrg <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    348  1.10    mrg </p>
    349  1.10    mrg <hr />
    350  1.10    mrg <a name="dos"></a><a name="DOS"></a>
    351  1.10    mrg <h3 class="heading">DOS</h3>
    352   1.1    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    353  1.10    mrg </p>
    354  1.10    mrg <p>You cannot install GCC by itself on MSDOS; it will not compile under
    355   1.1    mrg any MSDOS compiler except itself.  You need to get the complete
    356   1.1    mrg compilation package DJGPP, which includes binaries as well as sources,
    357   1.1    mrg and includes all the necessary compilation tools and libraries.
    358  1.10    mrg </p>
    359  1.10    mrg <hr />
    360  1.10    mrg <a name="epiphany-x-elf"></a><a name="epiphany-*-elf"></a>
    361  1.10    mrg <h3 class="heading">epiphany-*-elf</h3>
    362  1.10    mrg <p>Adapteva Epiphany.
    363   1.3  skrll This configuration is intended for embedded systems.
    364  1.10    mrg </p>
    365  1.10    mrg <hr />
    366  1.10    mrg <a name="x-x-freebsd"></a><a name="g_t*-*-freebsd*"></a>
    367  1.10    mrg <h3 class="heading">*-*-freebsd*</h3>
    368   1.1    mrg <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    369   1.1    mrg FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    370   1.1    mrg discontinued in GCC 4.0.
    371  1.10    mrg </p>
    372  1.10    mrg <p>In order to better utilize FreeBSD base system functionality and match
    373   1.3  skrll the configuration of the system compiler, GCC 4.5 and above as well as
    374   1.3  skrll GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    375   1.3  skrll on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    376   1.3  skrll (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    377  1.10    mrg <samp>libgcc_s.so.1</samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    378   1.3  skrll by GCC 4.5 and above.
    379  1.10    mrg </p>
    380  1.10    mrg <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    381  1.10    mrg for all CPU architectures.  You may use <samp>-gstabs</samp> instead of
    382  1.10    mrg <samp>-g</samp>, if you really want the old debugging format.  There are
    383   1.1    mrg no known issues with mixing object files and libraries with different
    384   1.1    mrg debugging formats.  Otherwise, this release of GCC should now match
    385   1.1    mrg more of the configuration used in the stock FreeBSD configuration of
    386  1.10    mrg GCC.  In particular, <samp>--enable-threads</samp> is now configured by
    387   1.1    mrg default.  However, as a general user, do not attempt to replace the
    388   1.1    mrg system compiler with this release.  Known to bootstrap and check with
    389   1.1    mrg good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    390   1.1    mrg and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    391   1.1    mrg 4.5, 4.8, 4.9 and 5-CURRENT.
    392  1.10    mrg </p>
    393  1.10    mrg <p>The version of binutils installed in <samp>/usr/bin</samp> probably works
    394   1.1    mrg with this release of GCC.  Bootstrapping against the latest GNU
    395  1.10    mrg binutils and/or the version found in <samp>/usr/ports/devel/binutils</samp> has
    396   1.1    mrg been known to enable additional features and improve overall testsuite
    397   1.9    mrg results.  However, it is currently known that boehm-gc may not configure
    398   1.9    mrg properly on FreeBSD prior to the FreeBSD 7.0 release with GNU binutils
    399   1.9    mrg after 2.16.1.
    400  1.10    mrg </p>
    401  1.10    mrg <hr />
    402  1.10    mrg <a name="ft32-x-elf"></a><a name="ft32-*-elf"></a>
    403  1.10    mrg <h3 class="heading">ft32-*-elf</h3>
    404  1.10    mrg <p>The FT32 processor.
    405   1.7    mrg This configuration is intended for embedded systems.
    406  1.10    mrg </p>
    407  1.10    mrg <hr />
    408  1.10    mrg <a name="h8300-hms"></a><a name="h8300-hms-1"></a>
    409  1.10    mrg <h3 class="heading">h8300-hms</h3>
    410   1.1    mrg <p>Renesas H8/300 series of processors.
    411  1.10    mrg </p>
    412  1.10    mrg <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    413  1.10    mrg </p>
    414  1.10    mrg <p>The calling convention and structure layout has changed in release 2.6.
    415   1.1    mrg All code must be recompiled.  The calling convention now passes the
    416   1.1    mrg first three arguments in function calls in registers.  Structures are no
    417   1.1    mrg longer a multiple of 2 bytes.
    418  1.10    mrg </p>
    419  1.10    mrg <hr />
    420  1.10    mrg <a name="hppa-hp-hpux"></a><a name="hppa*-hp-hpux*"></a>
    421  1.10    mrg <h3 class="heading">hppa*-hp-hpux*</h3>
    422   1.1    mrg <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    423  1.10    mrg </p>
    424  1.10    mrg <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    425   1.1    mrg later is recommended.
    426  1.10    mrg </p>
    427  1.10    mrg <p>It may be helpful to configure GCC with the
    428  1.10    mrg <a href="./configure.html#with-gnu-as"><samp>--with-gnu-as</samp></a> and
    429  1.10    mrg <samp>--with-as=&hellip;</samp> options to ensure that GCC can find GAS.
    430  1.10    mrg </p>
    431  1.10    mrg <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    432  1.10    mrg not work.  It shouldn&rsquo;t be used with any languages other than C due to its
    433   1.1    mrg many limitations.
    434  1.10    mrg </p>
    435  1.10    mrg <p>Specifically, <samp>-g</samp> does not work (HP-UX uses a peculiar debugging
    436   1.1    mrg format which GCC does not know about).  It also inserts timestamps
    437   1.1    mrg into each object file it creates, causing the 3-stage comparison test to
    438   1.1    mrg fail during a bootstrap.  You should be able to continue by saying
    439  1.10    mrg &lsquo;<samp>make all-host all-target</samp>&rsquo; after getting the failure from &lsquo;<samp>make</samp>&rsquo;.
    440  1.10    mrg </p>
    441  1.10    mrg <p>Various GCC features are not supported.  For example, it does not support weak
    442   1.1    mrg symbols or alias definitions.  As a result, explicit template instantiations
    443   1.1    mrg are required when using C++.  This makes it difficult if not impossible to
    444   1.1    mrg build many C++ applications.
    445  1.10    mrg </p>
    446  1.10    mrg <p>There are two default scheduling models for instructions.  These are
    447   1.1    mrg PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    448  1.10    mrg architecture specified for the target machine when configuring.
    449   1.1    mrg PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    450  1.10    mrg the target is a &lsquo;<samp>hppa1*</samp>&rsquo; machine.
    451  1.10    mrg </p>
    452  1.10    mrg <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    453   1.1    mrg it is important to completely specify the machine architecture when
    454   1.1    mrg configuring if you want a model other than PROCESSOR_8000.  The macro
    455   1.1    mrg TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    456   1.1    mrg default scheduling model is desired.
    457  1.10    mrg </p>
    458  1.10    mrg <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    459  1.10    mrg through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
    460   1.1    mrg This namespace change might cause problems when bootstrapping with
    461   1.1    mrg an earlier version of GCC or the HP compiler as essentially the same
    462   1.1    mrg namespace is required for an entire build.  This problem can be avoided
    463  1.10    mrg in a number of ways.  With HP cc, <code>UNIX_STD</code> can be set to &lsquo;<samp>95</samp>&rsquo;
    464  1.10    mrg or &lsquo;<samp>98</samp>&rsquo;.  Another way is to add an appropriate set of predefines
    465  1.10    mrg to <code>CC</code>.  The description for the <samp>munix=</samp> option contains
    466   1.1    mrg a list of the predefines used with each standard.
    467  1.10    mrg </p>
    468  1.10    mrg <p>More specific information to &lsquo;<samp>hppa*-hp-hpux*</samp>&rsquo; targets follows.
    469  1.10    mrg </p>
    470  1.10    mrg <hr />
    471  1.10    mrg <a name="hppa-hp-hpux10"></a><a name="hppa*-hp-hpux10"></a>
    472  1.10    mrg <h3 class="heading">hppa*-hp-hpux10</h3>
    473   1.1    mrg <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    474   1.1    mrg <code>PHCO_19798</code> from HP.
    475  1.10    mrg </p>
    476  1.10    mrg <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    477   1.1    mrg used for one-only code and data.  This resolves many of the previous
    478   1.1    mrg problems in using C++ on this target.  However, the ABI is not compatible
    479   1.1    mrg with the one implemented under HP-UX 11 using secondary definitions.
    480  1.10    mrg </p>
    481  1.10    mrg <hr />
    482  1.10    mrg <a name="hppa-hp-hpux11"></a><a name="hppa*-hp-hpux11"></a>
    483  1.10    mrg <h3 class="heading">hppa*-hp-hpux11</h3>
    484   1.1    mrg <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    485   1.1    mrg be used to compile GCC 3.0 and up.
    486  1.10    mrg </p>
    487  1.10    mrg <p>The libffi library haven&rsquo;t been ported to 64-bit HP-UX&nbsp;and doesn&rsquo;t build.
    488  1.10    mrg </p>
    489  1.10    mrg <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    490   1.1    mrg precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    491   1.9    mrg to build the Ada language as it cannot be bootstrapped using C.  Ada is
    492   1.1    mrg only available for the 32-bit PA-RISC runtime.
    493  1.10    mrg </p>
    494  1.10    mrg <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    495  1.10    mrg bundled compiler supports only traditional C; you will need either HP&rsquo;s
    496   1.1    mrg unbundled compiler, or a binary distribution of GCC.
    497  1.10    mrg </p>
    498  1.10    mrg <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    499   1.1    mrg but the process requires several steps.  GCC 3.3 can then be used to
    500   1.9    mrg build later versions.
    501  1.10    mrg </p>
    502  1.10    mrg <p>There are several possible approaches to building the distribution.
    503   1.1    mrg Binutils can be built first using the HP tools.  Then, the GCC
    504   1.1    mrg distribution can be built.  The second approach is to build GCC
    505  1.10    mrg first using the HP tools, then build binutils, then rebuild GCC.
    506   1.1    mrg There have been problems with various binary distributions, so it
    507   1.1    mrg is best not to start from a binary distribution.
    508  1.10    mrg </p>
    509  1.10    mrg <p>On 64-bit capable systems, there are two distinct targets.  Different
    510   1.1    mrg installation prefixes must be used if both are to be installed on
    511  1.10    mrg the same system.  The &lsquo;<samp>hppa[1-2]*-hp-hpux11*</samp>&rsquo; target generates code
    512  1.10    mrg for the 32-bit PA-RISC runtime architecture and uses the HP linker.
    513  1.10    mrg The &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target generates 64-bit code for the
    514   1.1    mrg PA-RISC 2.0 architecture.
    515  1.10    mrg </p>
    516  1.10    mrg <p>The script config.guess now selects the target type based on the compiler
    517  1.10    mrg detected during configuration.  You must define <code>PATH</code> or <code>CC</code> so
    518  1.10    mrg that configure finds an appropriate compiler for the initial bootstrap.
    519  1.10    mrg When <code>CC</code> is used, the definition should contain the options that are
    520  1.10    mrg needed whenever <code>CC</code> is used.
    521  1.10    mrg </p>
    522  1.10    mrg <p>Specifically, options that determine the runtime architecture must be
    523  1.10    mrg in <code>CC</code> to correctly select the target for the build.  It is also
    524  1.10    mrg convenient to place many other compiler options in <code>CC</code>.  For example,
    525  1.10    mrg <code>CC=&quot;cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE&quot;</code>
    526   1.1    mrg can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    527  1.10    mrg 64-bit K&amp;R/bundled mode.  The <samp>+DA2.0W</samp> option will result in
    528  1.10    mrg the automatic selection of the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target.  The
    529   1.1    mrg macro definition table of cpp needs to be increased for a successful
    530   1.1    mrg build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    531   1.1    mrg be defined when building with the bundled compiler, or when using the
    532  1.10    mrg <samp>-Ac</samp> option.  These defines aren&rsquo;t necessary with <samp>-Ae</samp>.
    533  1.10    mrg </p>
    534  1.10    mrg <p>It is best to explicitly configure the &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target
    535  1.10    mrg with the <samp>--with-ld=&hellip;</samp> option.  This overrides the standard
    536   1.1    mrg search for ld.  The two linkers supported on this target require different
    537   1.1    mrg commands.  The default linker is determined during configuration.  As a
    538  1.10    mrg result, it&rsquo;s not possible to switch linkers in the middle of a GCC build.
    539   1.1    mrg This has been reported to sometimes occur in unified builds of binutils
    540   1.1    mrg and GCC.
    541  1.10    mrg </p>
    542  1.10    mrg <p>A recent linker patch must be installed for the correct operation of
    543   1.1    mrg GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    544   1.1    mrg oldest linker patches that are known to work.  They are for HP-UX
    545   1.1    mrg 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    546  1.10    mrg <code>PHSS_24304</code>, might be usable but it hasn&rsquo;t been tested.  These
    547   1.1    mrg patches have been superseded.  Consult the HP patch database to obtain
    548   1.1    mrg the currently recommended linker patch for your system.
    549  1.10    mrg </p>
    550  1.10    mrg <p>The patches are necessary for the support of weak symbols on the
    551   1.1    mrg 32-bit port, and for the running of initializers and finalizers.  Weak
    552   1.1    mrg symbols are implemented using SOM secondary definition symbols.  Prior
    553  1.10    mrg to HP-UX 11, there are bugs in the linker support for secondary symbols.
    554   1.1    mrg The patches correct a problem of linker core dumps creating shared
    555   1.1    mrg libraries containing secondary symbols, as well as various other
    556   1.1    mrg linking issues involving secondary symbols.
    557  1.10    mrg </p>
    558  1.10    mrg <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    559   1.1    mrg run initializers and finalizers on the 64-bit port.  The 32-bit port
    560  1.10    mrg uses the linker <samp>+init</samp> and <samp>+fini</samp> options for the same
    561   1.1    mrg purpose.  The patches correct various problems with the +init/+fini
    562   1.1    mrg options, including program core dumps.  Binutils 2.14 corrects a
    563  1.10    mrg problem on the 64-bit port resulting from HP&rsquo;s non-standard use of
    564   1.1    mrg the .init and .fini sections for array initializers and finalizers.
    565  1.10    mrg </p>
    566  1.10    mrg <p>Although the HP and GNU linkers are both supported for the
    567  1.10    mrg &lsquo;<samp>hppa64-hp-hpux11*</samp>&rsquo; target, it is strongly recommended that the
    568   1.1    mrg HP linker be used for link editing on this target.
    569  1.10    mrg </p>
    570  1.10    mrg <p>At this time, the GNU linker does not support the creation of long
    571   1.9    mrg branch stubs.  As a result, it cannot successfully link binaries
    572   1.1    mrg containing branch offsets larger than 8 megabytes.  In addition,
    573   1.1    mrg there are problems linking shared libraries, linking executables
    574  1.10    mrg with <samp>-static</samp>, and with dwarf2 unwind and exception support.
    575  1.10    mrg It also doesn&rsquo;t provide stubs for internal calls to global functions
    576   1.9    mrg in shared libraries, so these calls cannot be overloaded.
    577  1.10    mrg </p>
    578  1.10    mrg <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    579   1.1    mrg versioning is not supported.  It may be necessary to disable symbol
    580  1.10    mrg versioning with <samp>--disable-symvers</samp> when using GNU ld.
    581  1.10    mrg </p>
    582  1.10    mrg <p>POSIX threads are the default.  The optional DCE thread library is not
    583  1.10    mrg supported, so <samp>--enable-threads=dce</samp> does not work.
    584  1.10    mrg </p>
    585  1.10    mrg <hr />
    586  1.10    mrg <a name="x-x-linux-gnu"></a><a name="g_t*-*-linux-gnu"></a>
    587  1.10    mrg <h3 class="heading">*-*-linux-gnu</h3>
    588   1.1    mrg <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    589   1.1    mrg in glibc 2.2.5 and later.  More information is available in the
    590   1.1    mrg libstdc++-v3 documentation.
    591  1.10    mrg </p>
    592  1.10    mrg <hr />
    593  1.10    mrg <a name="ix86-x-linux"></a><a name="i_003f86-*-linux*"></a>
    594  1.10    mrg <h3 class="heading">i?86-*-linux*</h3>
    595  1.10    mrg <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform.
    596   1.1    mrg See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    597  1.10    mrg </p>
    598  1.10    mrg <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    599   1.1    mrg possible you have a hardware problem.  Further information on this can be
    600   1.1    mrg found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    601  1.10    mrg </p>
    602  1.10    mrg <hr />
    603  1.12    mrg <a name="ix86-x-solaris2"></a><a name="i_003f86-*-solaris2*"></a>
    604  1.12    mrg <h3 class="heading">i?86-*-solaris2*</h3>
    605  1.12    mrg <p>Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
    606  1.12    mrg with GCC 4.7, there is also a 64-bit &lsquo;<samp>amd64-*-solaris2*</samp>&rsquo; or
    607  1.12    mrg &lsquo;<samp>x86_64-*-solaris2*</samp>&rsquo; configuration that corresponds to
    608  1.10    mrg &lsquo;<samp>sparcv9-sun-solaris2*</samp>&rsquo;.
    609  1.10    mrg </p>
    610  1.10    mrg <p>It is recommended that you configure GCC to use the GNU assembler.  The
    611  1.12    mrg versions included in Solaris 11.3, from GNU binutils 2.23.1 or
    612  1.12    mrg newer (available as <samp>/usr/bin/gas</samp> and
    613  1.10    mrg <samp>/usr/gnu/bin/as</samp>), work fine.  The current version, from GNU
    614  1.12    mrg binutils 2.34, is known to work.  Recent versions of the Solaris assembler in
    615  1.12    mrg <samp>/usr/bin/as</samp> work almost as well, though.
    616  1.12    mrg </p>
    617  1.12    mrg <p>For linking, the Solaris linker is preferred.  If you want to use the GNU
    618  1.12    mrg linker instead, the version in Solaris 11.3, from GNU binutils 2.23.1 or
    619  1.12    mrg newer (in <samp>/usr/gnu/bin/ld</samp> and <samp>/usr/bin/gld</samp>), works,
    620  1.12    mrg as does the latest version, from GNU binutils 2.34.
    621  1.10    mrg </p>
    622  1.10    mrg <p>To use GNU <code>as</code>, configure with the options
    623  1.12    mrg <samp>--with-gnu-as --with-as=/usr/gnu/bin/as</samp>.  It may be necessary
    624  1.10    mrg to configure with <samp>--without-gnu-ld --with-ld=/usr/ccs/bin/ld</samp> to
    625  1.12    mrg guarantee use of Solaris <code>ld</code>.
    626  1.10    mrg </p>
    627  1.10    mrg <hr />
    628  1.10    mrg <a name="ia64-x-linux"></a><a name="ia64-*-linux"></a>
    629  1.10    mrg <h3 class="heading">ia64-*-linux</h3>
    630   1.1    mrg <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    631   1.1    mrg running GNU/Linux.
    632  1.10    mrg </p>
    633  1.10    mrg <p>If you are using the installed system libunwind library with
    634  1.10    mrg <samp>--with-system-libunwind</samp>, then you must use libunwind 0.98 or
    635   1.1    mrg later.
    636  1.10    mrg </p>
    637  1.10    mrg <p>None of the following versions of GCC has an ABI that is compatible
    638   1.1    mrg with any of the other versions in this list, with the exception that
    639   1.1    mrg Red Hat 2.96 and Trillian 000171 are compatible with each other:
    640  1.10    mrg 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717.
    641  1.10    mrg This primarily affects C++ programs and programs that create shared libraries.
    642  1.10    mrg GCC 3.1 or later is recommended for compiling linux, the kernel.
    643   1.1    mrg As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    644   1.1    mrg more major ABI changes are expected.
    645  1.10    mrg </p>
    646  1.10    mrg <hr />
    647  1.10    mrg <a name="ia64-x-hpux"></a><a name="ia64-*-hpux*"></a>
    648  1.10    mrg <h3 class="heading">ia64-*-hpux*</h3>
    649   1.1    mrg <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    650   1.1    mrg assembler will not work.  To prevent GCC from using the wrong assembler,
    651  1.10    mrg the option <samp>--with-gnu-as</samp> may be necessary.
    652  1.10    mrg </p>
    653  1.10    mrg <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    654  1.10    mrg GCC versions 3.2.3 and earlier, <samp>--enable-libunwind-exceptions</samp>
    655  1.10    mrg is required to build GCC.  For GCC 3.3 and later, this is the default.
    656  1.10    mrg For gcc 3.4.3 and later, <samp>--enable-libunwind-exceptions</samp> is
    657   1.1    mrg removed and the system libunwind library will always be used.
    658  1.10    mrg </p>
    659  1.10    mrg <hr />
    660  1.10    mrg <!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
    661  1.10    mrg <a name="x-ibm-aix"></a><a name="g_t*-ibm-aix*"></a>
    662  1.10    mrg <h3 class="heading">*-ibm-aix*</h3>
    663  1.10    mrg <p>Support for AIX version 3 and older was discontinued in GCC 3.4.
    664   1.1    mrg Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    665  1.10    mrg </p>
    666  1.10    mrg <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    667   1.1    mrg process resource limits (ulimit).  Hard limits are configured in the
    668  1.10    mrg <samp>/etc/security/limits</samp> system configuration file.
    669  1.10    mrg </p>
    670  1.10    mrg <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    671   1.7    mrg cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    672   1.7    mrg G++ can bootstrap recent releases of GCC.
    673  1.10    mrg </p>
    674  1.10    mrg <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    675   1.1    mrg with an earlier release of GCC is recommended.  Bootstrapping with XLC
    676   1.1    mrg requires a larger data segment, which can be enabled through the
    677   1.1    mrg <var>LDR_CNTRL</var> environment variable, e.g.,
    678  1.10    mrg </p>
    679  1.10    mrg <div class="smallexample">
    680  1.10    mrg <pre class="smallexample">% LDR_CNTRL=MAXDATA=0x50000000
    681  1.10    mrg % export LDR_CNTRL
    682  1.10    mrg </pre></div>
    683   1.1    mrg 
    684  1.10    mrg <p>One can start with a pre-compiled version of GCC to build from
    685  1.10    mrg sources.  One may delete GCC&rsquo;s &ldquo;fixed&rdquo; header files when starting
    686   1.1    mrg with a version of GCC built for an earlier release of AIX.
    687  1.10    mrg </p>
    688  1.10    mrg <p>To speed up the configuration phases of bootstrapping and installing GCC,
    689  1.10    mrg one may use GNU Bash instead of AIX <code>/bin/sh</code>, e.g.,
    690  1.10    mrg </p>
    691  1.10    mrg <div class="smallexample">
    692  1.10    mrg <pre class="smallexample">% CONFIG_SHELL=/opt/freeware/bin/bash
    693  1.10    mrg % export CONFIG_SHELL
    694  1.10    mrg </pre></div>
    695   1.1    mrg 
    696  1.10    mrg <p>and then proceed as described in <a href="build.html">the build
    697  1.10    mrg instructions</a>, where we strongly recommend specifying an absolute path
    698   1.1    mrg to invoke <var>srcdir</var>/configure.
    699  1.10    mrg </p>
    700  1.10    mrg <p>Because GCC on AIX is built as a 32-bit executable by default,
    701   1.1    mrg (although it can generate 64-bit programs) the GMP and MPFR libraries
    702   1.1    mrg required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    703   1.1    mrg as static archive libraries works better than shared libraries.
    704  1.10    mrg </p>
    705  1.10    mrg <p>Errors involving <code>alloca</code> when building GCC generally are due
    706   1.1    mrg to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    707   1.1    mrg compiled with the native C compiler and GCC.  During the stage1 phase of
    708  1.10    mrg the build, the native AIX compiler <strong>must</strong> be invoked as <code>cc</code>
    709  1.10    mrg (not <code>xlc</code>).  Once <code>configure</code> has been informed of
    710  1.10    mrg <code>xlc</code>, one needs to use &lsquo;<samp>make distclean</samp>&rsquo; to remove the
    711  1.10    mrg configure cache files and ensure that <code>CC</code> environment variable
    712  1.10    mrg does not provide a definition that will confuse <code>configure</code>.
    713   1.1    mrg If this error occurs during stage2 or later, then the problem most likely
    714   1.1    mrg is the version of Make (see above).
    715  1.10    mrg </p>
    716  1.10    mrg <p>The native <code>as</code> and <code>ld</code> are recommended for
    717   1.3  skrll bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    718   1.3  skrll Binutils version 2.20 is the minimum level that supports bootstrap on
    719  1.10    mrg AIX 5.  The GNU Assembler has not been updated to support AIX 6&nbsp;or
    720   1.3  skrll AIX 7.  The native AIX tools do interoperate with GCC.
    721  1.10    mrg </p>
    722  1.10    mrg <p>AIX 7.1 added partial support for DWARF debugging, but full support
    723   1.7    mrg requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    724   1.7    mrg fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    725   1.7    mrg of libm.a missing important symbols; a fix for IV77796 will be
    726   1.7    mrg included in SP6.
    727  1.10    mrg </p>
    728  1.10    mrg <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    729   1.3  skrll assembler change that sometimes produces corrupt assembly files
    730   1.3  skrll causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    731   1.3  skrll can cause compilation failures with existing GCC installations.  An
    732   1.3  skrll AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    733   1.3  skrll IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    734   1.3  skrll AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    735   1.3  skrll AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    736  1.10    mrg </p>
    737  1.10    mrg <p>Building <samp>libstdc++.a</samp> requires a fix for an AIX Assembler bug
    738   1.1    mrg APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    739   1.1    mrg fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    740   1.1    mrg referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    741  1.10    mrg </p>
    742  1.10    mrg <a name="TransferAixShobj"></a><p>&lsquo;<samp>libstdc++</samp>&rsquo; in GCC 3.4 increments the major version number of the
    743  1.10    mrg shared object and GCC installation places the <samp>libstdc++.a</samp>
    744   1.1    mrg shared library in a common location which will overwrite the and GCC
    745   1.1    mrg 3.3 version of the shared library.  Applications either need to be
    746   1.1    mrg re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    747  1.10    mrg versions of the &lsquo;<samp>libstdc++</samp>&rsquo; shared object needs to be available
    748  1.10    mrg to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp>libstdc++.so.4</samp>&rsquo;, if
    749  1.10    mrg present, and GCC 3.3 &lsquo;<samp>libstdc++.so.5</samp>&rsquo; shared objects can be
    750   1.1    mrg installed for runtime dynamic loading using the following steps to set
    751  1.10    mrg the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag in the shared object for <em>each</em>
    752  1.10    mrg multilib <samp>libstdc++.a</samp> installed:
    753  1.10    mrg </p>
    754  1.10    mrg <p>Extract the shared objects from the currently installed
    755  1.10    mrg <samp>libstdc++.a</samp> archive:
    756  1.10    mrg </p><div class="smallexample">
    757  1.10    mrg <pre class="smallexample">% ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    758  1.10    mrg </pre></div>
    759   1.1    mrg 
    760  1.10    mrg <p>Enable the &lsquo;<samp>F_LOADONLY</samp>&rsquo; flag so that the shared object will be
    761   1.1    mrg available for runtime dynamic loading, but not linking:
    762  1.10    mrg </p><div class="smallexample">
    763  1.10    mrg <pre class="smallexample">% strip -e libstdc++.so.4 libstdc++.so.5
    764  1.10    mrg </pre></div>
    765  1.10    mrg 
    766  1.10    mrg <p>Archive the runtime-only shared object in the GCC 3.4
    767  1.10    mrg <samp>libstdc++.a</samp> archive:
    768  1.10    mrg </p><div class="smallexample">
    769  1.10    mrg <pre class="smallexample">% ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    770  1.10    mrg </pre></div>
    771  1.10    mrg 
    772  1.10    mrg <p>Eventually, the
    773  1.10    mrg <a href="./configure.html#WithAixSoname"><samp>--with-aix-soname=svr4</samp></a>
    774   1.5    mrg configure option may drop the need for this procedure for libraries that
    775   1.5    mrg support it.
    776  1.10    mrg </p>
    777  1.10    mrg <p>Linking executables and shared libraries may produce warnings of
    778   1.1    mrg duplicate symbols.  The assembly files generated by GCC for AIX always
    779   1.1    mrg have included multiple symbol definitions for certain global variable
    780   1.1    mrg and function declarations in the original program.  The warnings should
    781   1.1    mrg not prevent the linker from producing a correct library or runnable
    782   1.1    mrg executable.
    783  1.10    mrg </p>
    784  1.10    mrg <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    785   1.1    mrg 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    786  1.10    mrg to parse archive libraries did not handle the new format correctly.
    787   1.1    mrg These routines are used by GCC and result in error messages during
    788   1.1    mrg linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    789  1.10    mrg with AIX 4.3.1 should work for a 32-bit environment.  The <samp>-g</samp>
    790   1.1    mrg option of the archive command may be used to create archives of 32-bit
    791   1.1    mrg objects using the original &ldquo;small format&rdquo;.  A correct version of the
    792   1.1    mrg routines is shipped with AIX 4.3.2 and above.
    793  1.10    mrg </p>
    794  1.10    mrg <p>Some versions of the AIX binder (linker) can fail with a relocation
    795  1.10    mrg overflow severe error when the <samp>-bbigtoc</samp> option is used to link
    796   1.1    mrg GCC-produced object files into an executable that overflows the TOC.  A fix
    797   1.1    mrg for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    798   1.1    mrg available from IBM Customer Support and from its
    799   1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    800   1.1    mrg website as PTF U455193.
    801  1.10    mrg </p>
    802  1.10    mrg <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    803   1.1    mrg with a segmentation fault when invoked by any version of GCC.  A fix for
    804   1.1    mrg APAR IX87327 is available from IBM Customer Support and from its
    805   1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    806   1.1    mrg website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    807  1.10    mrg </p>
    808  1.10    mrg <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    809   1.1    mrg files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    810   1.1    mrg TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    811   1.1    mrg <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    812   1.1    mrg website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    813  1.10    mrg </p>
    814  1.10    mrg <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    815   1.1    mrg use NLS to support locale-specific representations of various data
    816  1.10    mrg formats including floating-point numbers (e.g., &lsquo;<samp>.</samp>&rsquo;  vs &lsquo;<samp>,</samp>&rsquo; for
    817   1.1    mrg separating decimal fractions).  There have been problems reported where
    818   1.1    mrg GCC does not produce the same floating-point formats that the assembler
    819  1.10    mrg expects.  If one encounters this problem, set the <code>LANG</code>
    820  1.10    mrg environment variable to &lsquo;<samp>C</samp>&rsquo; or &lsquo;<samp>En_US</samp>&rsquo;.
    821  1.10    mrg </p>
    822  1.10    mrg <p>A default can be specified with the <samp>-mcpu=<var>cpu_type</var></samp>
    823  1.10    mrg switch and using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
    824  1.10    mrg </p>
    825  1.10    mrg <hr />
    826  1.10    mrg <a name="iq2000-x-elf"></a><a name="iq2000-*-elf"></a>
    827  1.10    mrg <h3 class="heading">iq2000-*-elf</h3>
    828   1.1    mrg <p>Vitesse IQ2000 processors.  These are used in embedded
    829   1.1    mrg applications.  There are no standard Unix configurations.
    830  1.10    mrg </p>
    831  1.10    mrg <hr />
    832  1.10    mrg <a name="lm32-x-elf"></a><a name="lm32-*-elf"></a>
    833  1.10    mrg <h3 class="heading">lm32-*-elf</h3>
    834  1.10    mrg <p>Lattice Mico32 processor.
    835   1.1    mrg This configuration is intended for embedded systems.
    836  1.10    mrg </p>
    837  1.10    mrg <hr />
    838  1.10    mrg <a name="lm32-x-uclinux"></a><a name="lm32-*-uclinux"></a>
    839  1.10    mrg <h3 class="heading">lm32-*-uclinux</h3>
    840  1.10    mrg <p>Lattice Mico32 processor.
    841   1.1    mrg This configuration is intended for embedded systems running uClinux.
    842  1.10    mrg </p>
    843  1.10    mrg <hr />
    844  1.10    mrg <a name="m32c-x-elf"></a><a name="m32c-*-elf"></a>
    845  1.10    mrg <h3 class="heading">m32c-*-elf</h3>
    846  1.10    mrg <p>Renesas M32C processor.
    847   1.1    mrg This configuration is intended for embedded systems.
    848  1.10    mrg </p>
    849  1.10    mrg <hr />
    850  1.10    mrg <a name="m32r-x-elf"></a><a name="m32r-*-elf"></a>
    851  1.10    mrg <h3 class="heading">m32r-*-elf</h3>
    852  1.10    mrg <p>Renesas M32R processor.
    853   1.1    mrg This configuration is intended for embedded systems.
    854  1.10    mrg </p>
    855  1.10    mrg <hr />
    856  1.10    mrg <a name="m68k-x-x"></a><a name="m68k-*-*"></a>
    857  1.10    mrg <h3 class="heading">m68k-*-*</h3>
    858   1.1    mrg <p>By default,
    859  1.10    mrg &lsquo;<samp>m68k-*-elf*</samp>&rsquo;, &lsquo;<samp>m68k-*-rtems</samp>&rsquo;,  &lsquo;<samp>m68k-*-uclinux</samp>&rsquo; and
    860  1.10    mrg &lsquo;<samp>m68k-*-linux</samp>&rsquo;
    861   1.1    mrg build libraries for both M680x0 and ColdFire processors.  If you only
    862   1.1    mrg need the M680x0 libraries, you can omit the ColdFire ones by passing
    863  1.10    mrg <samp>--with-arch=m68k</samp> to <code>configure</code>.  Alternatively, you
    864  1.10    mrg can omit the M680x0 libraries by passing <samp>--with-arch=cf</samp> to
    865  1.10    mrg <code>configure</code>.  These targets default to 5206 or 5475 code as
    866   1.1    mrg appropriate for the target system when
    867  1.10    mrg configured with <samp>--with-arch=cf</samp> and 68020 code otherwise.
    868  1.10    mrg </p>
    869  1.10    mrg <p>The &lsquo;<samp>m68k-*-netbsd</samp>&rsquo; and
    870  1.10    mrg &lsquo;<samp>m68k-*-openbsd</samp>&rsquo; targets also support the <samp>--with-arch</samp>
    871   1.1    mrg option.  They will generate ColdFire CFV4e code when configured with
    872  1.10    mrg <samp>--with-arch=cf</samp> and 68020 code otherwise.
    873  1.10    mrg </p>
    874  1.10    mrg <p>You can override the default processors listed above by configuring
    875  1.10    mrg with <samp>--with-cpu=<var>target</var></samp>.  This <var>target</var> can either
    876  1.10    mrg be a <samp>-mcpu</samp> argument or one of the following values:
    877  1.10    mrg &lsquo;<samp>m68000</samp>&rsquo;, &lsquo;<samp>m68010</samp>&rsquo;, &lsquo;<samp>m68020</samp>&rsquo;, &lsquo;<samp>m68030</samp>&rsquo;,
    878  1.10    mrg &lsquo;<samp>m68040</samp>&rsquo;, &lsquo;<samp>m68060</samp>&rsquo;, &lsquo;<samp>m68020-40</samp>&rsquo; and &lsquo;<samp>m68020-60</samp>&rsquo;.
    879  1.10    mrg </p>
    880  1.10    mrg <p>GCC requires at least binutils version 2.17 on these targets.
    881  1.10    mrg </p>
    882  1.10    mrg <hr />
    883  1.10    mrg <a name="m68k-x-uclinux"></a><a name="m68k-*-uclinux"></a>
    884  1.10    mrg <h3 class="heading">m68k-*-uclinux</h3>
    885   1.1    mrg <p>GCC 4.3 changed the uClinux configuration so that it uses the
    886  1.10    mrg &lsquo;<samp>m68k-linux-gnu</samp>&rsquo; ABI rather than the &lsquo;<samp>m68k-elf</samp>&rsquo; ABI.
    887   1.1    mrg It also added improved support for C++ and flat shared libraries,
    888   1.3  skrll both of which were ABI changes.
    889  1.10    mrg </p>
    890  1.10    mrg <hr />
    891  1.10    mrg <a name="microblaze-x-elf"></a><a name="microblaze-*-elf"></a>
    892  1.10    mrg <h3 class="heading">microblaze-*-elf</h3>
    893  1.10    mrg <p>Xilinx MicroBlaze processor.
    894   1.1    mrg This configuration is intended for embedded systems.
    895  1.10    mrg </p>
    896  1.10    mrg <hr />
    897  1.10    mrg <a name="mips-x-x"></a><a name="mips-*-*"></a>
    898  1.10    mrg <h3 class="heading">mips-*-*</h3>
    899   1.1    mrg <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    900  1.10    mrg sections for all it&rsquo;s [sic] sectons [sic]&rdquo;, don&rsquo;t worry about it.  This
    901   1.1    mrg happens whenever you use GAS with the MIPS linker, but there is not
    902   1.1    mrg really anything wrong, and it is okay to use the output file.  You can
    903   1.1    mrg stop such warnings by installing the GNU linker.
    904  1.10    mrg </p>
    905  1.10    mrg <p>It would be nice to extend GAS to produce the gp tables, but they are
    906   1.1    mrg optional, and there should not be a warning about their absence.
    907  1.10    mrg </p>
    908  1.10    mrg <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    909   1.1    mrg and later.  A patch went in just after the GCC 3.3 release to
    910  1.10    mrg make &lsquo;<samp>mips*-*-*</samp>&rsquo; use the generic implementation instead.  You can also
    911  1.10    mrg configure for &lsquo;<samp>mipsel-elf</samp>&rsquo; as a workaround.  The
    912  1.10    mrg &lsquo;<samp>mips*-*-linux*</samp>&rsquo; target continues to use the MIPS II routines.  More
    913   1.1    mrg work on this is expected in future releases.
    914  1.10    mrg </p>
    915   1.1    mrg 
    916  1.10    mrg <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    917  1.10    mrg later systems and others that support the &lsquo;<samp>ll</samp>&rsquo;, &lsquo;<samp>sc</samp>&rsquo; and
    918  1.10    mrg &lsquo;<samp>sync</samp>&rsquo; instructions.  This can be overridden by passing
    919  1.10    mrg <samp>--with-llsc</samp> or <samp>--without-llsc</samp> when configuring GCC.
    920   1.1    mrg Since the Linux kernel emulates these instructions if they are
    921  1.10    mrg missing, the default for &lsquo;<samp>mips*-*-linux*</samp>&rsquo; targets is
    922  1.10    mrg <samp>--with-llsc</samp>.  The <samp>--with-llsc</samp> and
    923  1.10    mrg <samp>--without-llsc</samp> configure options may be overridden at compile
    924  1.10    mrg time by passing the <samp>-mllsc</samp> or <samp>-mno-llsc</samp> options to
    925   1.1    mrg the compiler.
    926  1.10    mrg </p>
    927  1.10    mrg <p>MIPS systems check for division by zero (unless
    928  1.10    mrg <samp>-mno-check-zero-division</samp> is passed to the compiler) by
    929   1.1    mrg generating either a conditional trap or a break instruction.  Using
    930   1.1    mrg trap results in smaller code, but is only supported on MIPS II and
    931   1.1    mrg later.  Also, some versions of the Linux kernel have a bug that
    932   1.1    mrg prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    933  1.10    mrg the use of break, use the <samp>--with-divide=breaks</samp>
    934  1.10    mrg <code>configure</code> option when configuring GCC.  The default is to
    935   1.1    mrg use traps on systems that support them.
    936  1.10    mrg </p>
    937  1.10    mrg <hr />
    938  1.10    mrg <a name="moxie-x-elf"></a><a name="moxie-*-elf"></a>
    939  1.10    mrg <h3 class="heading">moxie-*-elf</h3>
    940   1.3  skrll <p>The moxie processor.
    941  1.10    mrg </p>
    942  1.10    mrg <hr />
    943  1.12    mrg <a name="msp430-x-elf"></a><a name="msp430-*-elf*"></a>
    944  1.12    mrg <h3 class="heading">msp430-*-elf*</h3>
    945  1.10    mrg <p>TI MSP430 processor.
    946   1.5    mrg This configuration is intended for embedded systems.
    947  1.10    mrg </p>
    948  1.12    mrg <p>&lsquo;<samp>msp430-*-elf</samp>&rsquo; is the standard configuration with most GCC
    949  1.12    mrg features enabled by default.
    950  1.12    mrg </p>
    951  1.12    mrg <p>&lsquo;<samp>msp430-*-elfbare</samp>&rsquo; is tuned for a bare-metal environment, and disables
    952  1.12    mrg features related to shared libraries and other functionality not used for
    953  1.12    mrg this device.  This reduces code and data usage of the GCC libraries, resulting
    954  1.12    mrg in a minimal run-time environment by default.
    955  1.12    mrg </p>
    956  1.12    mrg <p>Features disabled by default include:
    957  1.12    mrg </p><ul>
    958  1.12    mrg <li> transactional memory
    959  1.12    mrg </li><li> __cxa_atexit
    960  1.12    mrg </li></ul>
    961  1.12    mrg 
    962  1.10    mrg <hr />
    963  1.10    mrg <a name="nds32le-x-elf"></a><a name="nds32le-*-elf"></a>
    964  1.10    mrg <h3 class="heading">nds32le-*-elf</h3>
    965   1.5    mrg <p>Andes NDS32 target in little endian mode.
    966  1.10    mrg </p>
    967  1.10    mrg <hr />
    968  1.10    mrg <a name="nds32be-x-elf"></a><a name="nds32be-*-elf"></a>
    969  1.10    mrg <h3 class="heading">nds32be-*-elf</h3>
    970   1.5    mrg <p>Andes NDS32 target in big endian mode.
    971  1.10    mrg </p>
    972  1.10    mrg <hr />
    973  1.10    mrg <a name="nvptx-x-none"></a><a name="nvptx-*-none"></a>
    974  1.10    mrg <h3 class="heading">nvptx-*-none</h3>
    975   1.5    mrg <p>Nvidia PTX target.
    976  1.10    mrg </p>
    977  1.10    mrg <p>Instead of GNU binutils, you will need to install
    978  1.10    mrg <a href="https://github.com/MentorEmbedded/nvptx-tools/">nvptx-tools</a>.
    979   1.5    mrg Tell GCC where to find it:
    980  1.10    mrg <samp>--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</samp>.
    981  1.10    mrg </p>
    982  1.10    mrg <p>You will need newlib 3.0 git revision
    983  1.10    mrg cd31fbb2aea25f94d7ecedc9db16dfc87ab0c316 or later.  It can be
    984  1.10    mrg automatically built together with GCC.  For this, add a symbolic link
    985  1.10    mrg to nvptx-newlib&rsquo;s <samp>newlib</samp> directory to the directory containing
    986  1.10    mrg the GCC sources.
    987  1.10    mrg </p>
    988  1.10    mrg <p>Use the <samp>--disable-sjlj-exceptions</samp> and
    989  1.10    mrg <samp>--enable-newlib-io-long-long</samp> options when configuring.
    990  1.10    mrg </p>
    991  1.10    mrg <hr />
    992  1.11    mrg <a name="or1k-x-elf"></a><a name="or1k-*-elf"></a>
    993  1.11    mrg <h3 class="heading">or1k-*-elf</h3>
    994  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
    995  1.11    mrg This configuration is intended for embedded systems.
    996  1.11    mrg </p>
    997  1.11    mrg <hr />
    998  1.11    mrg <a name="or1k-x-linux"></a><a name="or1k-*-linux"></a>
    999  1.11    mrg <h3 class="heading">or1k-*-linux</h3>
   1000  1.11    mrg <p>The OpenRISC 1000 32-bit processor with delay slots.
   1001  1.11    mrg </p>
   1002  1.11    mrg <hr />
   1003  1.10    mrg <a name="powerpc-x-x"></a><a name="powerpc-*-*"></a>
   1004  1.10    mrg <h3 class="heading">powerpc-*-*</h3>
   1005  1.10    mrg <p>You can specify a default version for the <samp>-mcpu=<var>cpu_type</var></samp>
   1006  1.10    mrg switch by using the configure option <samp>--with-cpu-<var>cpu_type</var></samp>.
   1007  1.10    mrg </p>
   1008  1.12    mrg <p>You will need GNU binutils 2.20 or newer.
   1009  1.10    mrg </p>
   1010  1.10    mrg <hr />
   1011  1.10    mrg <a name="powerpc-x-darwin"></a><a name="powerpc-*-darwin*"></a>
   1012  1.10    mrg <h3 class="heading">powerpc-*-darwin*</h3>
   1013   1.1    mrg <p>PowerPC running Darwin (Mac OS X kernel).
   1014  1.10    mrg </p>
   1015  1.10    mrg <p>Pre-installed versions of Mac OS X may not include any developer tools,
   1016   1.1    mrg meaning that you will not be able to build GCC from source.  Tool
   1017   1.1    mrg binaries are available at
   1018   1.9    mrg <a href="https://opensource.apple.com">https://opensource.apple.com</a>.
   1019  1.10    mrg </p>
   1020  1.10    mrg <p>This version of GCC requires at least cctools-590.36.  The
   1021   1.1    mrg cctools-590.36 package referenced from
   1022   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
   1023   1.1    mrg on systems older than 10.3.9 (aka darwin7.9.0).
   1024  1.10    mrg </p>
   1025  1.10    mrg <hr />
   1026  1.10    mrg <a name="powerpc-x-elf"></a><a name="powerpc-*-elf"></a>
   1027  1.10    mrg <h3 class="heading">powerpc-*-elf</h3>
   1028   1.1    mrg <p>PowerPC system in big endian mode, running System V.4.
   1029  1.10    mrg </p>
   1030  1.10    mrg <hr />
   1031  1.10    mrg <a name="powerpc-x-linux-gnu"></a><a name="powerpc*-*-linux-gnu*"></a>
   1032  1.10    mrg <h3 class="heading">powerpc*-*-linux-gnu*</h3>
   1033   1.1    mrg <p>PowerPC system in big endian mode running Linux.
   1034  1.10    mrg </p>
   1035  1.10    mrg <hr />
   1036  1.10    mrg <a name="powerpc-x-netbsd"></a><a name="powerpc-*-netbsd*"></a>
   1037  1.10    mrg <h3 class="heading">powerpc-*-netbsd*</h3>
   1038   1.1    mrg <p>PowerPC system in big endian mode running NetBSD.
   1039  1.10    mrg </p>
   1040  1.10    mrg <hr />
   1041  1.10    mrg <a name="powerpc-x-eabisim"></a><a name="powerpc-*-eabisim"></a>
   1042  1.10    mrg <h3 class="heading">powerpc-*-eabisim</h3>
   1043   1.1    mrg <p>Embedded PowerPC system in big endian mode for use in running under the
   1044   1.1    mrg PSIM simulator.
   1045  1.10    mrg </p>
   1046  1.10    mrg <hr />
   1047  1.10    mrg <a name="powerpc-x-eabi"></a><a name="powerpc-*-eabi"></a>
   1048  1.10    mrg <h3 class="heading">powerpc-*-eabi</h3>
   1049   1.1    mrg <p>Embedded PowerPC system in big endian mode.
   1050  1.10    mrg </p>
   1051  1.10    mrg <hr />
   1052  1.10    mrg <a name="powerpcle-x-elf"></a><a name="powerpcle-*-elf"></a>
   1053  1.10    mrg <h3 class="heading">powerpcle-*-elf</h3>
   1054   1.1    mrg <p>PowerPC system in little endian mode, running System V.4.
   1055  1.10    mrg </p>
   1056  1.10    mrg <hr />
   1057  1.10    mrg <a name="powerpcle-x-eabisim"></a><a name="powerpcle-*-eabisim"></a>
   1058  1.10    mrg <h3 class="heading">powerpcle-*-eabisim</h3>
   1059   1.1    mrg <p>Embedded PowerPC system in little endian mode for use in running under
   1060   1.1    mrg the PSIM simulator.
   1061  1.10    mrg </p>
   1062  1.10    mrg <hr />
   1063  1.10    mrg <a name="powerpcle-x-eabi"></a><a name="powerpcle-*-eabi"></a>
   1064  1.10    mrg <h3 class="heading">powerpcle-*-eabi</h3>
   1065   1.1    mrg <p>Embedded PowerPC system in little endian mode.
   1066  1.10    mrg </p>
   1067  1.10    mrg <hr />
   1068  1.10    mrg <a name="rl78-x-elf"></a><a name="rl78-*-elf"></a>
   1069  1.10    mrg <h3 class="heading">rl78-*-elf</h3>
   1070  1.10    mrg <p>The Renesas RL78 processor.
   1071  1.10    mrg This configuration is intended for embedded systems.
   1072  1.10    mrg </p>
   1073  1.10    mrg <hr />
   1074  1.10    mrg <a name="riscv32-x-elf"></a><a name="riscv32-*-elf"></a>
   1075  1.10    mrg <h3 class="heading">riscv32-*-elf</h3>
   1076  1.10    mrg <p>The RISC-V RV32 instruction set.
   1077   1.3  skrll This configuration is intended for embedded systems.
   1078  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1079  1.10    mrg </p>
   1080  1.10    mrg <hr />
   1081  1.10    mrg <a name="riscv32-x-linux"></a><a name="riscv32-*-linux"></a>
   1082  1.10    mrg <h3 class="heading">riscv32-*-linux</h3>
   1083  1.10    mrg <p>The RISC-V RV32 instruction set running GNU/Linux.
   1084  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1085  1.10    mrg </p>
   1086  1.10    mrg <hr />
   1087  1.10    mrg <a name="riscv64-x-elf"></a><a name="riscv64-*-elf"></a>
   1088  1.10    mrg <h3 class="heading">riscv64-*-elf</h3>
   1089  1.10    mrg <p>The RISC-V RV64 instruction set.
   1090  1.10    mrg This configuration is intended for embedded systems.
   1091  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1092  1.10    mrg </p>
   1093  1.10    mrg <hr />
   1094  1.10    mrg <a name="riscv64-x-linux"></a><a name="riscv64-*-linux"></a>
   1095  1.10    mrg <h3 class="heading">riscv64-*-linux</h3>
   1096  1.10    mrg <p>The RISC-V RV64 instruction set running GNU/Linux.
   1097  1.12    mrg This (and all other RISC-V) targets require the binutils 2.30 release.
   1098  1.10    mrg </p>
   1099  1.10    mrg <hr />
   1100  1.10    mrg <a name="rx-x-elf"></a><a name="rx-*-elf"></a>
   1101  1.10    mrg <h3 class="heading">rx-*-elf</h3>
   1102   1.9    mrg <p>The Renesas RX processor.
   1103  1.10    mrg </p>
   1104  1.10    mrg <hr />
   1105  1.10    mrg <a name="s390-x-linux"></a><a name="s390-*-linux*"></a>
   1106  1.10    mrg <h3 class="heading">s390-*-linux*</h3>
   1107   1.1    mrg <p>S/390 system running GNU/Linux for S/390.
   1108  1.10    mrg </p>
   1109  1.10    mrg <hr />
   1110  1.10    mrg <a name="s390x-x-linux"></a><a name="s390x-*-linux*"></a>
   1111  1.10    mrg <h3 class="heading">s390x-*-linux*</h3>
   1112   1.1    mrg <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1113  1.10    mrg </p>
   1114  1.10    mrg <hr />
   1115  1.10    mrg <a name="s390x-ibm-tpf"></a><a name="s390x-ibm-tpf*"></a>
   1116  1.10    mrg <h3 class="heading">s390x-ibm-tpf*</h3>
   1117   1.1    mrg <p>zSeries system (64-bit) running TPF.  This platform is
   1118   1.1    mrg supported as cross-compilation target only.
   1119  1.10    mrg </p>
   1120  1.10    mrg <hr />
   1121  1.10    mrg <a name="x-x-solaris2"></a><a name="g_t*-*-solaris2*"></a>
   1122  1.10    mrg <h3 class="heading">*-*-solaris2*</h3>
   1123  1.12    mrg <p>Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
   1124  1.12    mrg 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
   1125  1.12    mrg GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
   1126  1.12    mrg </p>
   1127  1.12    mrg <p>Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1128  1.12    mrg <code>/usr/gcc/4.5/bin/gcc</code> or similar.  Newer Solaris versions
   1129  1.12    mrg provide one or more of GCC 5, 7, and 9.  Alternatively,
   1130   1.1    mrg you can install a pre-built GCC to bootstrap and install GCC.  See the
   1131   1.1    mrg <a href="binaries.html">binaries page</a> for details.
   1132  1.10    mrg </p>
   1133  1.10    mrg <p>The Solaris 2 <code>/bin/sh</code> will often fail to configure
   1134  1.12    mrg &lsquo;<samp>libstdc++-v3</samp>&rsquo;.  We therefore recommend using the
   1135   1.9    mrg following initial sequence of commands
   1136  1.10    mrg </p>
   1137  1.10    mrg <div class="smallexample">
   1138  1.10    mrg <pre class="smallexample">% CONFIG_SHELL=/bin/ksh
   1139  1.10    mrg % export CONFIG_SHELL
   1140  1.10    mrg </pre></div>
   1141   1.9    mrg 
   1142  1.10    mrg <p>and proceed as described in <a href="configure.html">the configure instructions</a>.
   1143   1.1    mrg In addition we strongly recommend specifying an absolute path to invoke
   1144  1.10    mrg <code><var>srcdir</var>/configure</code>.
   1145  1.10    mrg </p>
   1146  1.12    mrg <p>In Solaris 11, you need to check for <code>system/header</code>,
   1147  1.12    mrg <code>system/linker</code>, and <code>developer/assembler</code> packages.
   1148  1.10    mrg </p>
   1149  1.10    mrg <p>Trying to use the linker and other tools in
   1150  1.10    mrg <samp>/usr/ucb</samp> to install GCC has been observed to cause trouble.
   1151   1.1    mrg For example, the linker may hang indefinitely.  The fix is to remove
   1152  1.10    mrg <samp>/usr/ucb</samp> from your <code>PATH</code>.
   1153  1.10    mrg </p>
   1154  1.12    mrg <p>The build process works more smoothly with the legacy Solaris tools so, if you
   1155  1.10    mrg have <samp>/usr/xpg4/bin</samp> in your <code>PATH</code>, we recommend that you place
   1156  1.10    mrg <samp>/usr/bin</samp> before <samp>/usr/xpg4/bin</samp> for the duration of the build.
   1157  1.10    mrg </p>
   1158  1.10    mrg <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1159  1.10    mrg conjunction with the Solaris linker.  The GNU <code>as</code>
   1160  1.12    mrg versions included in Solaris 11.3,
   1161  1.12    mrg from GNU binutils 2.23.1 or newer (in <samp>/usr/bin/gas</samp> and
   1162  1.10    mrg <samp>/usr/gnu/bin/as</samp>), are known to work.
   1163  1.12    mrg The current version, from GNU binutils 2.34,
   1164  1.10    mrg is known to work as well.  Note that your mileage may vary
   1165   1.7    mrg if you use a combination of the GNU tools and the Solaris tools: while the
   1166  1.12    mrg combination GNU <code>as</code> + Solaris <code>ld</code> should reasonably work,
   1167  1.12    mrg the reverse combination Solaris <code>as</code> + GNU <code>ld</code> may fail to
   1168  1.10    mrg build or cause memory corruption at runtime in some cases for C++ programs.
   1169  1.12    mrg GNU <code>ld</code> usually works as well.  Again, the current
   1170  1.12    mrg version (2.34) is known to work, but generally lacks platform specific
   1171  1.10    mrg features, so better stay with Solaris <code>ld</code>.  To use the LTO linker
   1172  1.10    mrg plugin (<samp>-fuse-linker-plugin</samp>) with GNU <code>ld</code>, GNU
   1173  1.10    mrg binutils <em>must</em> be configured with <samp>--enable-largefile</samp>.
   1174  1.10    mrg </p>
   1175  1.10    mrg <p>To enable symbol versioning in &lsquo;<samp>libstdc++</samp>&rsquo; with the Solaris linker,
   1176  1.10    mrg you need to have any version of GNU <code>c++filt</code>, which is part of
   1177  1.10    mrg GNU binutils.  &lsquo;<samp>libstdc++</samp>&rsquo; symbol versioning will be disabled if no
   1178  1.10    mrg appropriate version is found.  Solaris <code>c++filt</code> from the Solaris
   1179   1.7    mrg Studio compilers does <em>not</em> work.
   1180  1.10    mrg </p>
   1181  1.12    mrg <p>The versions of the GNU Multiple Precision Library (GMP), the MPFR
   1182  1.12    mrg library and the MPC library bundled with Solaris 11.3 and later are
   1183  1.12    mrg usually recent enough to match GCC&rsquo;s requirements.  There are two
   1184  1.12    mrg caveats:
   1185  1.10    mrg </p>
   1186  1.12    mrg <ul>
   1187  1.12    mrg <li> While the version of the GMP library in Solaris 11.3 works with GCC, you
   1188  1.12    mrg need to configure with <samp>--with-gmp-include=/usr/include/gmp</samp>.
   1189  1.12    mrg 
   1190  1.12    mrg </li><li> The version of the MPFR libary included in Solaris 11.3 is too old; you
   1191  1.12    mrg need to provide a more recent one.
   1192  1.12    mrg </li></ul>
   1193  1.12    mrg 
   1194  1.10    mrg <hr />
   1195  1.10    mrg <a name="sparc-x-x"></a><a name="sparc*-*-*"></a>
   1196  1.10    mrg <h3 class="heading">sparc*-*-*</h3>
   1197   1.3  skrll <p>This section contains general configuration information for all
   1198   1.3  skrll SPARC-based platforms.  In addition to reading this section, please
   1199   1.3  skrll read all other sections that match your target.
   1200  1.10    mrg </p>
   1201  1.10    mrg <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1202   1.3  skrll library and the MPC library are known to be miscompiled by earlier
   1203   1.3  skrll versions of GCC on these platforms.  We therefore recommend the use
   1204   1.3  skrll of the exact versions of these libraries listed as minimal versions
   1205   1.3  skrll in <a href="prerequisites.html">the prerequisites</a>.
   1206  1.10    mrg </p>
   1207  1.10    mrg <hr />
   1208  1.10    mrg <a name="sparc-sun-solaris2"></a><a name="sparc-sun-solaris2*"></a>
   1209  1.10    mrg <h3 class="heading">sparc-sun-solaris2*</h3>
   1210   1.1    mrg <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1211  1.12    mrg produced are smaller than the ones produced using Solaris native tools;
   1212   1.1    mrg this difference is quite significant for binaries containing debugging
   1213   1.1    mrg information.
   1214  1.10    mrg </p>
   1215  1.10    mrg <p>Starting with Solaris 7, the operating system is capable of executing
   1216   1.1    mrg 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1217  1.10    mrg this; the <samp>-m64</samp> option enables 64-bit code generation.
   1218   1.1    mrg However, if all you want is code tuned for the UltraSPARC CPU, you
   1219  1.10    mrg should try the <samp>-mtune=ultrasparc</samp> option instead, which produces
   1220   1.1    mrg code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1221   1.1    mrg machines.
   1222  1.10    mrg </p>
   1223  1.10    mrg <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1224   1.3  skrll library or the MPC library on a Solaris 7 or later system, the canonical
   1225  1.10    mrg target triplet must be specified as the <code>build</code> parameter on the
   1226  1.10    mrg configure line.  This target triplet can be obtained by invoking <code>./config.guess</code> in the toplevel source directory of GCC (and
   1227  1.12    mrg not that of GMP or MPFR or MPC).  For example on a Solaris 11 system:
   1228  1.10    mrg </p>
   1229  1.10    mrg <div class="smallexample">
   1230  1.12    mrg <pre class="smallexample">% ./configure --build=sparc-sun-solaris2.11 --prefix=xxx
   1231  1.10    mrg </pre></div>
   1232  1.10    mrg 
   1233  1.10    mrg <hr />
   1234  1.10    mrg <a name="sparc-x-linux"></a><a name="sparc-*-linux*"></a>
   1235  1.10    mrg <h3 class="heading">sparc-*-linux*</h3>
   1236  1.10    mrg 
   1237  1.10    mrg <hr />
   1238  1.10    mrg <a name="sparc64-x-solaris2"></a><a name="sparc64-*-solaris2*"></a>
   1239  1.10    mrg <h3 class="heading">sparc64-*-solaris2*</h3>
   1240  1.12    mrg <p>When configuring a 64-bit-default GCC on Solaris/SPARC, you must use a
   1241  1.12    mrg build compiler that generates 64-bit code, either by default or by
   1242  1.12    mrg specifying &lsquo;<samp>CC='gcc -m64' CXX='gcc-m64'</samp>&rsquo; to <code>configure</code>.
   1243  1.12    mrg Additionally, you <em>must</em> pass <samp>--build=sparc64-sun-solaris2.11</samp>
   1244  1.12    mrg or <samp>--build=sparcv9-sun-solaris2.11</samp> because <samp>config.guess</samp>
   1245  1.12    mrg misdetects this situation, which can cause build failures.
   1246  1.12    mrg </p>
   1247   1.3  skrll <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1248   1.3  skrll library or the MPC library, the canonical target triplet must be specified
   1249  1.10    mrg as the <code>build</code> parameter on the configure line.  For example
   1250  1.12    mrg on a Solaris 11 system:
   1251  1.10    mrg </p>
   1252  1.10    mrg <div class="smallexample">
   1253  1.12    mrg <pre class="smallexample">% ./configure --build=sparc64-sun-solaris2.11 --prefix=xxx
   1254  1.10    mrg </pre></div>
   1255  1.10    mrg 
   1256  1.10    mrg <hr />
   1257  1.10    mrg <a name="sparcv9-x-solaris2"></a><a name="sparcv9-*-solaris2*"></a>
   1258  1.10    mrg <h3 class="heading">sparcv9-*-solaris2*</h3>
   1259  1.10    mrg <p>This is a synonym for &lsquo;<samp>sparc64-*-solaris2*</samp>&rsquo;.
   1260  1.10    mrg </p>
   1261  1.10    mrg <hr />
   1262  1.10    mrg <a name="c6x-x-x"></a><a name="c6x-*-*"></a>
   1263  1.10    mrg <h3 class="heading">c6x-*-*</h3>
   1264   1.3  skrll <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1265  1.10    mrg </p>
   1266  1.10    mrg <hr />
   1267  1.10    mrg <a name="tilegx-*-linux"></a><a name="tilegx-*-linux*"></a>
   1268  1.10    mrg <h3 class="heading">tilegx-*-linux*</h3>
   1269   1.5    mrg <p>The TILE-Gx processor in little endian mode, running GNU/Linux.  This
   1270   1.5    mrg port requires binutils-2.22 or newer.
   1271  1.10    mrg </p>
   1272  1.10    mrg <hr />
   1273  1.10    mrg <a name="tilegxbe-*-linux"></a><a name="tilegxbe-*-linux*"></a>
   1274  1.10    mrg <h3 class="heading">tilegxbe-*-linux*</h3>
   1275   1.5    mrg <p>The TILE-Gx processor in big endian mode, running GNU/Linux.  This
   1276   1.5    mrg port requires binutils-2.23 or newer.
   1277  1.10    mrg </p>
   1278  1.10    mrg <hr />
   1279  1.10    mrg <a name="tilepro-*-linux"></a><a name="tilepro-*-linux*"></a>
   1280  1.10    mrg <h3 class="heading">tilepro-*-linux*</h3>
   1281   1.3  skrll <p>The TILEPro processor running GNU/Linux.  This port requires
   1282   1.3  skrll binutils-2.22 or newer.
   1283  1.10    mrg </p>
   1284  1.10    mrg <hr />
   1285  1.10    mrg <a name="visium-x-elf"></a><a name="visium-*-elf"></a>
   1286  1.10    mrg <h3 class="heading">visium-*-elf</h3>
   1287  1.10    mrg <p>CDS VISIUMcore processor.
   1288   1.5    mrg This configuration is intended for embedded systems.
   1289  1.10    mrg </p>
   1290  1.10    mrg <hr />
   1291  1.10    mrg <a name="x-x-vxworks"></a><a name="g_t*-*-vxworks*"></a>
   1292  1.10    mrg <h3 class="heading">*-*-vxworks*</h3>
   1293   1.1    mrg <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1294  1.10    mrg very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC.
   1295  1.10    mrg We welcome patches for other architectures supported by VxWorks 5.5.
   1296   1.1    mrg Support for VxWorks AE would also be welcome; we believe this is merely
   1297   1.1    mrg a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1298   1.1    mrg not interested in supporting older, a.out or COFF-based, versions of
   1299   1.1    mrg VxWorks in GCC 3.
   1300  1.10    mrg </p>
   1301  1.10    mrg <p>VxWorks comes with an older version of GCC installed in
   1302  1.10    mrg <samp><var>$WIND_BASE</var>/host</samp>; we recommend you do not overwrite it.
   1303  1.10    mrg Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>.
   1304  1.10    mrg Before running <code>configure</code>, create the directories <samp><var>prefix</var></samp>
   1305  1.10    mrg and <samp><var>prefix</var>/bin</samp>.  Link or copy the appropriate assembler,
   1306  1.10    mrg linker, etc. into <samp><var>prefix</var>/bin</samp>, and set your <var>PATH</var> to
   1307  1.10    mrg include that directory while running both <code>configure</code> and
   1308  1.10    mrg <code>make</code>.
   1309  1.10    mrg </p>
   1310  1.10    mrg <p>You must give <code>configure</code> the
   1311  1.10    mrg <samp>--with-headers=<var>$WIND_BASE</var>/target/h</samp> switch so that it can
   1312   1.1    mrg find the VxWorks system headers.  Since VxWorks is a cross compilation
   1313  1.10    mrg target only, you must also specify <samp>--target=<var>target</var></samp>.
   1314  1.10    mrg <code>configure</code> will attempt to create the directory
   1315  1.10    mrg <samp><var>prefix</var>/<var>target</var>/sys-include</samp> and copy files into it;
   1316  1.10    mrg make sure the user running <code>configure</code> has sufficient privilege
   1317   1.1    mrg to do so.
   1318  1.10    mrg </p>
   1319  1.10    mrg <p>GCC&rsquo;s exception handling runtime requires a special &ldquo;configlette&rdquo;
   1320  1.10    mrg module, <samp>contrib/gthr_supp_vxw_5x.c</samp>.  Follow the instructions in
   1321   1.1    mrg that file to add the module to your kernel build.  (Future versions of
   1322   1.1    mrg VxWorks will incorporate this module.)
   1323  1.10    mrg </p>
   1324  1.10    mrg <hr />
   1325  1.10    mrg <a name="x86-64-x-x"></a><a name="x86_005f64-*-*_002c-amd64-*-*"></a>
   1326  1.10    mrg <h3 class="heading">x86_64-*-*, amd64-*-*</h3>
   1327   1.1    mrg <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1328  1.10    mrg (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD.
   1329   1.1    mrg On GNU/Linux the default is a bi-arch compiler which is able to generate
   1330  1.10    mrg both 64-bit x86-64 and 32-bit x86 code (via the <samp>-m32</samp> switch).
   1331  1.10    mrg </p>
   1332  1.10    mrg <hr />
   1333  1.12    mrg <a name="x86-64-x-solaris2"></a><a name="x86_005f64-*-solaris2*"></a>
   1334  1.12    mrg <h3 class="heading">x86_64-*-solaris2*</h3>
   1335   1.3  skrll <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1336  1.10    mrg processor (&lsquo;<samp>amd64-*-*</samp>&rsquo; is an alias for &lsquo;<samp>x86_64-*-*</samp>&rsquo;) on
   1337   1.3  skrll Solaris 10 or later.  Unlike other systems, without special options a
   1338   1.3  skrll bi-arch compiler is built which generates 32-bit code by default, but
   1339  1.10    mrg can generate 64-bit x86-64 code with the <samp>-m64</samp> switch.  Since
   1340   1.7    mrg GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1341  1.10    mrg can generate 32-bit code with <samp>-m32</samp>.  To configure and build
   1342  1.10    mrg this way, you have to provide all support libraries like <samp>libgmp</samp>
   1343  1.12    mrg as 64-bit code, configure with <samp>--target=x86_64-pc-solaris2.11</samp>
   1344  1.10    mrg and &lsquo;<samp>CC=gcc -m64</samp>&rsquo;.
   1345  1.10    mrg </p>
   1346  1.10    mrg <hr />
   1347  1.10    mrg <a name="xtensa-x-elf"></a><a name="xtensa*-*-elf"></a>
   1348  1.10    mrg <h3 class="heading">xtensa*-*-elf</h3>
   1349   1.1    mrg <p>This target is intended for embedded Xtensa systems using the
   1350  1.10    mrg &lsquo;<samp>newlib</samp>&rsquo; C library.  It uses ELF but does not support shared
   1351   1.1    mrg objects.  Designed-defined instructions specified via the
   1352   1.1    mrg Tensilica Instruction Extension (TIE) language are only supported
   1353   1.1    mrg through inline assembly.
   1354  1.10    mrg </p>
   1355  1.10    mrg <p>The Xtensa configuration information must be specified prior to
   1356  1.10    mrg building GCC.  The <samp>include/xtensa-config.h</samp> header
   1357   1.1    mrg file contains the configuration information.  If you created your
   1358   1.1    mrg own Xtensa configuration with the Xtensa Processor Generator, the
   1359   1.1    mrg downloaded files include a customized copy of this header file,
   1360   1.1    mrg which you can use to replace the default header file.
   1361  1.10    mrg </p>
   1362  1.10    mrg <hr />
   1363  1.10    mrg <a name="xtensa-x-linux"></a><a name="xtensa*-*-linux*"></a>
   1364  1.10    mrg <h3 class="heading">xtensa*-*-linux*</h3>
   1365   1.1    mrg <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1366   1.1    mrg shared objects and the GNU C library (glibc).  It also generates
   1367   1.1    mrg position-independent code (PIC) regardless of whether the
   1368  1.10    mrg <samp>-fpic</samp> or <samp>-fPIC</samp> options are used.  In other
   1369   1.1    mrg respects, this target is the same as the
   1370  1.10    mrg <a href="#xtensa*-*-elf">&lsquo;<samp>xtensa*-*-elf</samp>&rsquo;</a> target.
   1371  1.10    mrg </p>
   1372  1.10    mrg <hr />
   1373  1.10    mrg <a name="windows"></a><a name="Microsoft-Windows"></a>
   1374  1.10    mrg <h3 class="heading">Microsoft Windows</h3>
   1375   1.1    mrg 
   1376  1.10    mrg <a name="Intel-16-bit-versions"></a>
   1377  1.10    mrg <h4 class="subheading">Intel 16-bit versions</h4>
   1378   1.1    mrg <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1379   1.1    mrg supported.
   1380  1.10    mrg </p>
   1381  1.10    mrg <p>However, the 32-bit port has limited support for Microsoft
   1382   1.1    mrg Windows 3.11 in the Win32s environment, as a target only.  See below.
   1383  1.10    mrg </p>
   1384  1.10    mrg <a name="Intel-32-bit-versions"></a>
   1385  1.10    mrg <h4 class="subheading">Intel 32-bit versions</h4>
   1386   1.1    mrg <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1387   1.1    mrg XP, and Windows Vista, are supported by several different target
   1388   1.1    mrg platforms.  These targets differ in which Windows subsystem they target
   1389   1.1    mrg and which C libraries are used.
   1390  1.10    mrg </p>
   1391  1.10    mrg <ul>
   1392  1.10    mrg <li> Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1393  1.10    mrg Linux API emulation layer in the Win32 subsystem.
   1394  1.10    mrg </li><li> MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1395  1.10    mrg the Win32 subsystem that provides a subset of POSIX.
   1396  1.10    mrg </li><li> MKS i386-pc-mks: NuTCracker from MKS.  See
   1397  1.10    mrg <a href="https://www.mkssoftware.com">https://www.mkssoftware.com</a> for more information.
   1398  1.10    mrg </li></ul>
   1399   1.1    mrg 
   1400  1.10    mrg <a name="Intel-64-bit-versions"></a>
   1401  1.10    mrg <h4 class="subheading">Intel 64-bit versions</h4>
   1402   1.1    mrg <p>GCC contains support for x86-64 using the mingw-w64
   1403  1.10    mrg runtime library, available from <a href="http://mingw-w64.org/doku.php">http://mingw-w64.org/doku.php</a>.
   1404   1.1    mrg This library should be used with the target triple x86_64-pc-mingw32.
   1405  1.10    mrg </p>
   1406  1.10    mrg <p>Presently Windows for Itanium is not supported.
   1407  1.10    mrg </p>
   1408  1.10    mrg <a name="Windows-CE"></a>
   1409  1.10    mrg <h4 class="subheading">Windows CE</h4>
   1410   1.3  skrll <p>Windows CE is supported as a target only on Hitachi
   1411   1.1    mrg SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1412  1.10    mrg </p>
   1413  1.10    mrg <a name="Other-Windows-Platforms"></a>
   1414  1.10    mrg <h4 class="subheading">Other Windows Platforms</h4>
   1415   1.1    mrg <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1416  1.10    mrg </p>
   1417  1.10    mrg <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1418   1.1    mrg support the Interix subsystem.  See above.
   1419  1.10    mrg </p>
   1420  1.10    mrg <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1421  1.10    mrg </p>
   1422  1.10    mrg <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1423   1.1    mrg be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1424  1.10    mrg </p>
   1425  1.10    mrg <p>UWIN support has been removed due to a lack of maintenance.
   1426  1.10    mrg </p>
   1427  1.10    mrg <hr />
   1428  1.10    mrg <a name="x-x-cygwin"></a><a name="g_t*-*-cygwin"></a>
   1429  1.10    mrg <h3 class="heading">*-*-cygwin</h3>
   1430   1.1    mrg <p>Ports of GCC are included with the
   1431   1.1    mrg <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1432  1.10    mrg </p>
   1433  1.10    mrg <p>GCC will build under Cygwin without modification; it does not build
   1434  1.10    mrg with Microsoft&rsquo;s C++ compiler and there are no plans to make it do so.
   1435  1.10    mrg </p>
   1436  1.10    mrg <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1437   1.1    mrg cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1438   1.1    mrg used with as up-to-date a version of binutils as possible; use either
   1439   1.1    mrg the latest official GNU binutils release in the Cygwin distribution,
   1440   1.1    mrg or version 2.20 or above if building your own.
   1441  1.10    mrg </p>
   1442  1.10    mrg <hr />
   1443  1.10    mrg <a name="x-x-mingw32"></a><a name="g_t*-*-mingw32"></a>
   1444  1.10    mrg <h3 class="heading">*-*-mingw32</h3>
   1445  1.10    mrg <p>GCC will build with and support only MinGW runtime 3.12 and later.
   1446   1.1    mrg Earlier versions of headers are incompatible with the new default semantics
   1447   1.1    mrg of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1448  1.10    mrg </p>
   1449  1.10    mrg <hr />
   1450  1.10    mrg <a name="older"></a><a name="Older-systems"></a>
   1451  1.10    mrg <h3 class="heading">Older systems</h3>
   1452   1.1    mrg <p>GCC contains support files for many older (1980s and early
   1453   1.1    mrg 1990s) Unix variants.  For the most part, support for these systems
   1454   1.1    mrg has not been deliberately removed, but it has not been maintained for
   1455   1.1    mrg several years and may suffer from bitrot.
   1456  1.10    mrg </p>
   1457  1.10    mrg <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems.
   1458   1.1    mrg Support for these systems is still present in that release, but
   1459  1.10    mrg <code>configure</code> will fail unless the <samp>--enable-obsolete</samp>
   1460   1.1    mrg option is given.  Unless a maintainer steps forward, support for these
   1461   1.1    mrg systems will be removed from the next release of GCC.
   1462  1.10    mrg </p>
   1463  1.10    mrg <p>Support for old systems as hosts for GCC can cause problems if the
   1464   1.1    mrg workarounds for compiler, library and operating system bugs affect the
   1465   1.1    mrg cleanliness or maintainability of the rest of GCC.  In some cases, to
   1466   1.1    mrg bring GCC up on such a system, if still possible with current GCC, may
   1467   1.1    mrg require first installing an old version of GCC which did work on that
   1468   1.1    mrg system, and using it to compile a more recent GCC, to avoid bugs in the
   1469   1.1    mrg vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1470  1.10    mrg <samp>old-releases</samp> directory on the <a href="../mirrors.html">GCC mirror
   1471  1.10    mrg sites</a>.  Header bugs may generally be avoided using
   1472  1.10    mrg <code>fixincludes</code>, but bugs or deficiencies in libraries and the
   1473   1.1    mrg operating system may still cause problems.
   1474  1.10    mrg </p>
   1475  1.10    mrg <p>Support for older systems as targets for cross-compilation is less
   1476   1.1    mrg problematic than support for them as hosts for GCC; if an enthusiast
   1477   1.1    mrg wishes to make such a target work again (including resurrecting any of
   1478   1.1    mrg the targets that never worked with GCC 2, starting from the last
   1479   1.1    mrg version before they were removed), patches
   1480   1.1    mrg <a href="../contribute.html">following the usual requirements</a> would be
   1481   1.1    mrg likely to be accepted, since they should not affect the support for more
   1482   1.1    mrg modern targets.
   1483  1.10    mrg </p>
   1484  1.10    mrg <p>For some systems, old versions of GNU binutils may also be useful,
   1485  1.10    mrg and are available from <samp>pub/binutils/old-releases</samp> on
   1486   1.9    mrg <a href="https://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1487  1.10    mrg </p>
   1488  1.10    mrg <p>Some of the information on specific systems above relates to
   1489   1.1    mrg such older systems, but much of the information
   1490   1.1    mrg about GCC on such systems (which may no longer be applicable to
   1491   1.1    mrg current GCC) is to be found in the GCC texinfo manual.
   1492  1.10    mrg </p>
   1493  1.10    mrg <hr />
   1494  1.10    mrg <a name="elf"></a><a name="all-ELF-targets-_0028SVR4_002c-Solaris-2_002c-etc_002e_0029"></a>
   1495  1.10    mrg <h3 class="heading">all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1496   1.1    mrg <p>C++ support is significantly better on ELF targets if you use the
   1497   1.1    mrg <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1498   1.1    mrg inlines, vtables and template instantiations will be discarded
   1499   1.1    mrg automatically.
   1500  1.10    mrg </p>
   1501   1.1    mrg 
   1502  1.10    mrg <hr />
   1503  1.10    mrg <p>
   1504   1.1    mrg <p><a href="./index.html">Return to the GCC Installation page</a>
   1505  1.10    mrg </p>
   1506  1.10    mrg 
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   1511   1.1    mrg 
   1512  1.10    mrg </body>
   1513  1.10    mrg </html>
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