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     42 <h1 class="settitle">Host/Target specific installation notes for GCC</h1>
     43 <a name="index-Specific-1"></a><a name="index-Specific-installation-notes-2"></a><a name="index-Target-specific-installation-3"></a><a name="index-Host-specific-installation-4"></a><a name="index-Target-specific-installation-notes-5"></a>
     44 Please read this document carefully <em>before</em> installing the
     45 GNU Compiler Collection on your machine.
     46 
     47    <p>Note that this list of install notes is <em>not</em> a list of supported
     48 hosts or targets.  Not all supported hosts and targets are listed
     49 here, only the ones that require host-specific or target-specific
     50 information have to.
     51 
     52      <ul>
     53 <li><a href="#aarch64-x-x">aarch64*-*-*</a>
     54 <li><a href="#alpha-x-x">alpha*-*-*</a>
     55 <li><a href="#alpha-dec-osf51">alpha*-dec-osf5.1</a>
     56 <li><a href="#amd64-x-solaris210">amd64-*-solaris2.10</a>
     57 <li><a href="#arm-x-eabi">arm-*-eabi</a>
     58 <li><a href="#avr">avr</a>
     59 <li><a href="#bfin">Blackfin</a>
     60 <li><a href="#dos">DOS</a>
     61 <li><a href="#x-x-freebsd">*-*-freebsd*</a>
     62 <li><a href="#h8300-hms">h8300-hms</a>
     63 <li><a href="#hppa-hp-hpux">hppa*-hp-hpux*</a>
     64 <li><a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a>
     65 <li><a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a>
     66 <li><a href="#x-x-linux-gnu">*-*-linux-gnu</a>
     67 <li><a href="#ix86-x-linux">i?86-*-linux*</a>
     68 <li><a href="#ix86-x-solaris210">i?86-*-solaris2.10</a>
     69 <li><a href="#ia64-x-linux">ia64-*-linux</a>
     70 <li><a href="#ia64-x-hpux">ia64-*-hpux*</a>
     71 <li><a href="#x-ibm-aix">*-ibm-aix*</a>
     72 <li><a href="#iq2000-x-elf">iq2000-*-elf</a>
     73 <li><a href="#lm32-x-elf">lm32-*-elf</a>
     74 <li><a href="#lm32-x-uclinux">lm32-*-uclinux</a>
     75 <li><a href="#m32c-x-elf">m32c-*-elf</a>
     76 <li><a href="#m32r-x-elf">m32r-*-elf</a>
     77 <li><a href="#m68k-x-x">m68k-*-*</a>
     78 <li><a href="#m68k-uclinux">m68k-uclinux</a>
     79 <li><a href="#mep-x-elf">mep-*-elf</a>
     80 <li><a href="#microblaze-x-elf">microblaze-*-elf</a>
     81 <li><a href="#mips-x-x">mips-*-*</a>
     82 <li><a href="#mips-sgi-irix5">mips-sgi-irix5</a>
     83 <li><a href="#mips-sgi-irix6">mips-sgi-irix6</a>
     84 <li><a href="#nds32le-x-elf">nds32le-*-elf</a>
     85 <li><a href="#nds32be-x-elf">nds32be-*-elf</a>
     86 <li><a href="#nvptx-x-none">nvptx-*-none</a>
     87 <li><a href="#powerpc-x-x">powerpc*-*-*</a>
     88 <li><a href="#powerpc-x-darwin">powerpc-*-darwin*</a>
     89 <li><a href="#powerpc-x-elf">powerpc-*-elf</a>
     90 <li><a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a>
     91 <li><a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a>
     92 <li><a href="#powerpc-x-eabisim">powerpc-*-eabisim</a>
     93 <li><a href="#powerpc-x-eabi">powerpc-*-eabi</a>
     94 <li><a href="#powerpcle-x-elf">powerpcle-*-elf</a>
     95 <li><a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a>
     96 <li><a href="#powerpcle-x-eabi">powerpcle-*-eabi</a>
     97 <li><a href="#s390-x-linux">s390-*-linux*</a>
     98 <li><a href="#s390x-x-linux">s390x-*-linux*</a>
     99 <li><a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a>
    100 <li><a href="#x-x-solaris2">*-*-solaris2*</a>
    101 <li><a href="#sparc-x-x">sparc*-*-*</a>
    102 <li><a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a>
    103 <li><a href="#sparc-sun-solaris210">sparc-sun-solaris2.10</a>
    104 <li><a href="#sparc-x-linux">sparc-*-linux*</a>
    105 <li><a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a>
    106 <li><a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a>
    107 <li><a href="#c6x-x-x">c6x-*-*</a>
    108 <li><a href="#tilegx-x-linux">tilegx-*-linux*</a>
    109 <li><a href="#tilegxbe-x-linux">tilegxbe-*-linux*</a>
    110 <li><a href="#tilepro-x-linux">tilepro-*-linux*</a>
    111 <li><a href="#visium-x-elf">visium-*-elf</a>
    112 <li><a href="#x-x-vxworks">*-*-vxworks*</a>
    113 <li><a href="#x86-64-x-x">x86_64-*-*</a> amd64-*-*
    114 <li><a href="#x86-64-x-solaris210">x86_64-*-solaris2.1[0-9]*</a>
    115 <li><a href="#xtensa-x-elf">xtensa*-*-elf</a>
    116 <li><a href="#xtensa-x-linux">xtensa*-*-linux*</a>
    117 <li><a href="#windows">Microsoft Windows</a>
    118 <li><a href="#x-x-cygwin">*-*-cygwin</a>
    119 <li><a href="#x-x-interix">*-*-interix</a>
    120 <li><a href="#x-x-mingw32">*-*-mingw32</a>
    121 <li><a href="#os2">OS/2</a>
    122 <li><a href="#older">Older systems</a>
    123 </ul>
    124 
    125      <ul>
    126 <li><a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.) 
    127 </ul>
    128 
    129    <p><!-- -------- host/target specific issues start here ---------------- -->
    130 <hr /><a name="aarch64_002dx_002dx"></a>
    131 
    132 <h3 class="heading"><a name="TOC0"></a>aarch64*-*-*</h3>
    133 
    134 <p>Binutils pre 2.24 does not have support for selecting <samp><span class="option">-mabi</span></samp> and
    135 does not support ILP32.  If it is used to build GCC 4.9 or later, GCC will
    136 not support option <samp><span class="option">-mabi=ilp32</span></samp>.
    137 
    138    <p>To enable a workaround for the Cortex-A53 erratum number 835769 by default
    139 (for all CPUs regardless of -mcpu option given) at configure time use the
    140 <samp><span class="option">--enable-fix-cortex-a53-835769</span></samp> option.  This will enable the fix by
    141 default and can be explicitly disabled during compilation by passing the
    142 <samp><span class="option">-mno-fix-cortex-a53-835769</span></samp> option.  Conversely,
    143 <samp><span class="option">--disable-fix-cortex-a53-835769</span></samp> will disable the workaround by
    144 default.  The workaround is disabled by default if neither of
    145 <samp><span class="option">--enable-fix-cortex-a53-835769</span></samp> or
    146 <samp><span class="option">--disable-fix-cortex-a53-835769</span></samp> is given at configure time.
    147 
    148    <p>To enable a workaround for the Cortex-A53 erratum number 843419 by default
    149 (for all CPUs regardless of -mcpu option given) at configure time use the
    150 <samp><span class="option">--enable-fix-cortex-a53-843419</span></samp> option.  This workaround is applied at
    151 link time.  Enabling the workaround will cause GCC to pass the relevant option
    152 to the linker.  It can be explicitly disabled during compilation by passing the
    153 <samp><span class="option">-mno-fix-cortex-a53-843419</span></samp> option.  Conversely,
    154 <samp><span class="option">--disable-fix-cortex-a53-843419</span></samp> will disable the workaround by default. 
    155 The workaround is disabled by default if neither of
    156 <samp><span class="option">--enable-fix-cortex-a53-843419</span></samp> or
    157 <samp><span class="option">--disable-fix-cortex-a53-843419</span></samp> is given at configure time.
    158 
    159    <p><hr /><a name="alpha_002dx_002dx"></a>
    160 
    161 <h3 class="heading"><a name="TOC1"></a>alpha*-*-*</h3>
    162 
    163 <p>This section contains general configuration information for all
    164 alpha-based platforms using ELF (in particular, ignore this section for
    165 DEC OSF/1, Digital UNIX and Tru64 UNIX).  In addition to reading this
    166 section, please read all other sections that match your target.
    167 
    168    <p>We require binutils 2.11.2 or newer. 
    169 Previous binutils releases had a number of problems with DWARF 2
    170 debugging information, not the least of which is incorrect linking of
    171 shared libraries.
    172 
    173    <p><hr /><a name="alpha_002ddec_002dosf51"></a>
    174 
    175 <h3 class="heading"><a name="TOC2"></a>alpha*-dec-osf5.1</h3>
    176 
    177 <p>Systems using processors that implement the DEC Alpha architecture and
    178 are running the DEC/Compaq/HP Unix (DEC OSF/1, Digital UNIX, or Compaq/HP
    179 Tru64 UNIX) operating system, for example the DEC Alpha AXP systems.
    180 
    181    <p>Support for Tru64 UNIX V5.1 has been removed in GCC 4.8.  As of GCC 4.6,
    182 support for Tru64 UNIX V4.0 and V5.0 has been removed.  As of GCC 3.2,
    183 versions before <code>alpha*-dec-osf4</code> are no longer supported.  (These
    184 are the versions which identify themselves as DEC OSF/1.)
    185 
    186    <p><hr /><a name="amd64_002dx_002dsolaris210"></a>
    187 
    188 <h3 class="heading"><a name="TOC3"></a>amd64-*-solaris2.1[0-9]*</h3>
    189 
    190 <p>This is a synonym for &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo;.
    191 
    192    <p><hr /><a name="arc_002dx_002delf32"></a>
    193 
    194 <h3 class="heading"><a name="TOC4"></a>arc-*-elf32</h3>
    195 
    196 <p>Use &lsquo;<samp><span class="samp">configure --target=arc-elf32 --with-cpu=</span><var>cpu</var><span class="samp"> --enable-languages="c,c++"</span></samp>&rsquo;
    197 to configure GCC, with <var>cpu</var> being one of &lsquo;<samp><span class="samp">arc600</span></samp>&rsquo;, &lsquo;<samp><span class="samp">arc601</span></samp>&rsquo;,
    198 or &lsquo;<samp><span class="samp">arc700</span></samp>&rsquo;.
    199 
    200    <p><hr /><a name="arc_002dlinux_002duclibc"></a>
    201 
    202 <h3 class="heading"><a name="TOC5"></a>arc-linux-uclibc</h3>
    203 
    204 <p>Use &lsquo;<samp><span class="samp">configure --target=arc-linux-uclibc --with-cpu=arc700 --enable-languages="c,c++"</span></samp>&rsquo; to configure GCC.
    205 
    206    <p><hr /><a name="arm_002dx_002deabi"></a>
    207 
    208 <h3 class="heading"><a name="TOC6"></a>arm-*-eabi</h3>
    209 
    210 <p>ARM-family processors.  Subtargets that use the ELF object format
    211 require GNU binutils 2.13 or newer.  Such subtargets include:
    212 <code>arm-*-netbsdelf</code>, <code>arm-*-*linux-*</code>
    213 and <code>arm-*-rtemseabi</code>.
    214 
    215    <p>Building the Ada frontend commonly fails (an infinite loop executing
    216 <code>xsinfo</code>) if the host compiler is GNAT 4.8.  Host compilers built from the
    217 GNAT 4.6, 4.9 or 5 release branches are known to succeed.
    218 
    219    <p><hr /><a name="avr"></a>
    220 
    221 <h3 class="heading"><a name="TOC7"></a>avr</h3>
    222 
    223 <p>ATMEL AVR-family micro controllers.  These are used in embedded
    224 applications.  There are no standard Unix configurations. 
    225 See &ldquo;AVR Options&rdquo; in the main manual
    226 for the list of supported MCU types.
    227 
    228    <p>Use &lsquo;<samp><span class="samp">configure --target=avr --enable-languages="c"</span></samp>&rsquo; to configure GCC.
    229 
    230    <p>Further installation notes and other useful information about AVR tools
    231 can also be obtained from:
    232 
    233      <ul>
    234 <li><a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a>
    235 <li><a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a>
    236 </ul>
    237 
    238    <p>We <em>strongly</em> recommend using binutils 2.13 or newer.
    239 
    240    <p>The following error:
    241 <pre class="smallexample">     Error: register required
    242 </pre>
    243    <p>indicates that you should upgrade to a newer version of the binutils.
    244 
    245    <p><hr /><a name="bfin"></a>
    246 
    247 <h3 class="heading"><a name="TOC8"></a>Blackfin</h3>
    248 
    249 <p>The Blackfin processor, an Analog Devices DSP. 
    250 See &ldquo;Blackfin Options&rdquo; in the main manual
    251 
    252    <p>More information, and a version of binutils with support for this processor,
    253 is available at <a href="http://blackfin.uclinux.org">http://blackfin.uclinux.org</a>
    254 
    255    <p><hr /><a name="cr16"></a>
    256 
    257 <h3 class="heading"><a name="TOC9"></a>CR16</h3>
    258 
    259 <p>The CR16 CompactRISC architecture is a 16-bit architecture. This
    260 architecture is used in embedded applications.
    261 
    262    <p>See &ldquo;CR16 Options&rdquo; in the main manual for a list of CR16-specific options.
    263 
    264    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-elf --enable-languages=c,c++</span></samp>&rsquo; to configure
    265 GCC for building a CR16 elf cross-compiler.
    266 
    267    <p>Use &lsquo;<samp><span class="samp">configure --target=cr16-uclinux --enable-languages=c,c++</span></samp>&rsquo; to
    268 configure GCC for building a CR16 uclinux cross-compiler.
    269 
    270    <p><hr /><a name="cris"></a>
    271 
    272 <h3 class="heading"><a name="TOC10"></a>CRIS</h3>
    273 
    274 <p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip
    275 series.  These are used in embedded applications.
    276 
    277    <p>See &ldquo;CRIS Options&rdquo; in the main manual
    278 for a list of CRIS-specific options.
    279 
    280    <p>There are a few different CRIS targets:
    281      <dl>
    282 <dt><code>cris-axis-elf</code><dd>Mainly for monolithic embedded systems.  Includes a multilib for the
    283 &lsquo;<samp><span class="samp">v10</span></samp>&rsquo; core used in &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo;. 
    284 <br><dt><code>cris-axis-linux-gnu</code><dd>A GNU/Linux port for the CRIS architecture, currently targeting
    285 &lsquo;<samp><span class="samp">ETRAX 100 LX</span></samp>&rsquo; by default. 
    286 </dl>
    287 
    288    <p>For <code>cris-axis-elf</code> you need binutils 2.11
    289 or newer.  For <code>cris-axis-linux-gnu</code> you need binutils 2.12 or newer.
    290 
    291    <p>Pre-packaged tools can be obtained from
    292 <a href="ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/">ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/</a>.  More
    293 information about this platform is available at
    294 <a href="http://developer.axis.com/">http://developer.axis.com/</a>.
    295 
    296    <p><hr /><a name="dos"></a>
    297 
    298 <h3 class="heading"><a name="TOC11"></a>DOS</h3>
    299 
    300 <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    301 
    302    <p>You cannot install GCC by itself on MSDOS; it will not compile under
    303 any MSDOS compiler except itself.  You need to get the complete
    304 compilation package DJGPP, which includes binaries as well as sources,
    305 and includes all the necessary compilation tools and libraries.
    306 
    307    <p><hr /><a name="epiphany_002dx_002delf"></a>
    308 
    309 <h3 class="heading"><a name="TOC12"></a>epiphany-*-elf</h3>
    310 
    311 <p>Adapteva Epiphany. 
    312 This configuration is intended for embedded systems.
    313 
    314    <p><hr /><a name="x_002dx_002dfreebsd"></a>
    315 
    316 <h3 class="heading"><a name="TOC13"></a>*-*-freebsd*</h3>
    317 
    318 <p>Support for FreeBSD 1 was discontinued in GCC 3.2.  Support for
    319 FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was
    320 discontinued in GCC 4.0.
    321 
    322    <p>In order to better utilize FreeBSD base system functionality and match
    323 the configuration of the system compiler, GCC 4.5 and above as well as
    324 GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present
    325 on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default
    326 (on FreeBSD 6 or later).  The use of <code>dl_iterate_phdr</code> inside
    327 <samp><span class="file">libgcc_s.so.1</span></samp> and boehm-gc (on FreeBSD 7 or later) is enabled
    328 by GCC 4.5 and above.
    329 
    330    <p>We support FreeBSD using the ELF file format with DWARF 2 debugging
    331 for all CPU architectures.  You may use <samp><span class="option">-gstabs</span></samp> instead of
    332 <samp><span class="option">-g</span></samp>, if you really want the old debugging format.  There are
    333 no known issues with mixing object files and libraries with different
    334 debugging formats.  Otherwise, this release of GCC should now match
    335 more of the configuration used in the stock FreeBSD configuration of
    336 GCC.  In particular, <samp><span class="option">--enable-threads</span></samp> is now configured by
    337 default.  However, as a general user, do not attempt to replace the
    338 system compiler with this release.  Known to bootstrap and check with
    339 good results on FreeBSD 7.2-STABLE.  In the past, known to bootstrap
    340 and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4,
    341 4.5, 4.8, 4.9 and 5-CURRENT.
    342 
    343    <p>The version of binutils installed in <samp><span class="file">/usr/bin</span></samp> probably works
    344 with this release of GCC.  Bootstrapping against the latest GNU
    345 binutils and/or the version found in <samp><span class="file">/usr/ports/devel/binutils</span></samp> has
    346 been known to enable additional features and improve overall testsuite
    347 results.  However, it is currently known that boehm-gc (which itself
    348 is required for java) may not configure properly on FreeBSD prior to
    349 the FreeBSD 7.0 release with GNU binutils after 2.16.1.
    350 
    351    <p><hr /><a name="ft32_002dx_002delf"></a>
    352 
    353 <h3 class="heading"><a name="TOC14"></a>ft32-*-elf</h3>
    354 
    355 <p>The FT32 processor. 
    356 This configuration is intended for embedded systems.
    357 
    358    <p><hr /><a name="h8300_002dhms"></a>
    359 
    360 <h3 class="heading"><a name="TOC15"></a>h8300-hms</h3>
    361 
    362 <p>Renesas H8/300 series of processors.
    363 
    364    <p>Please have a look at the <a href="binaries.html">binaries page</a>.
    365 
    366    <p>The calling convention and structure layout has changed in release 2.6. 
    367 All code must be recompiled.  The calling convention now passes the
    368 first three arguments in function calls in registers.  Structures are no
    369 longer a multiple of 2 bytes.
    370 
    371    <p><hr /><a name="hppa_002dhp_002dhpux"></a>
    372 
    373 <h3 class="heading"><a name="TOC16"></a>hppa*-hp-hpux*</h3>
    374 
    375 <p>Support for HP-UX version 9 and older was discontinued in GCC 3.4.
    376 
    377    <p>We require using gas/binutils on all hppa platforms.  Version 2.19 or
    378 later is recommended.
    379 
    380    <p>It may be helpful to configure GCC with the
    381 <a href="./configure.html#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> and
    382 <samp><span class="option">--with-as=...</span></samp> options to ensure that GCC can find GAS.
    383 
    384    <p>The HP assembler should not be used with GCC.  It is rarely tested and may
    385 not work.  It shouldn't be used with any languages other than C due to its
    386 many limitations.
    387 
    388    <p>Specifically, <samp><span class="option">-g</span></samp> does not work (HP-UX uses a peculiar debugging
    389 format which GCC does not know about).  It also inserts timestamps
    390 into each object file it creates, causing the 3-stage comparison test to
    391 fail during a bootstrap.  You should be able to continue by saying
    392 &lsquo;<samp><span class="samp">make all-host all-target</span></samp>&rsquo; after getting the failure from &lsquo;<samp><span class="samp">make</span></samp>&rsquo;.
    393 
    394    <p>Various GCC features are not supported.  For example, it does not support weak
    395 symbols or alias definitions.  As a result, explicit template instantiations
    396 are required when using C++.  This makes it difficult if not impossible to
    397 build many C++ applications.
    398 
    399    <p>There are two default scheduling models for instructions.  These are
    400 PROCESSOR_7100LC and PROCESSOR_8000.  They are selected from the pa-risc
    401 architecture specified for the target machine when configuring. 
    402 PROCESSOR_8000 is the default.  PROCESSOR_7100LC is selected when
    403 the target is a &lsquo;<samp><span class="samp">hppa1*</span></samp>&rsquo; machine.
    404 
    405    <p>The PROCESSOR_8000 model is not well suited to older processors.  Thus,
    406 it is important to completely specify the machine architecture when
    407 configuring if you want a model other than PROCESSOR_8000.  The macro
    408 TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
    409 default scheduling model is desired.
    410 
    411    <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10
    412 through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later. 
    413 This namespace change might cause problems when bootstrapping with
    414 an earlier version of GCC or the HP compiler as essentially the same
    415 namespace is required for an entire build.  This problem can be avoided
    416 in a number of ways.  With HP cc, <samp><span class="env">UNIX_STD</span></samp> can be set to &lsquo;<samp><span class="samp">95</span></samp>&rsquo;
    417 or &lsquo;<samp><span class="samp">98</span></samp>&rsquo;.  Another way is to add an appropriate set of predefines
    418 to <samp><span class="env">CC</span></samp>.  The description for the <samp><span class="option">munix=</span></samp> option contains
    419 a list of the predefines used with each standard.
    420 
    421    <p>More specific information to &lsquo;<samp><span class="samp">hppa*-hp-hpux*</span></samp>&rsquo; targets follows.
    422 
    423    <p><hr /><a name="hppa_002dhp_002dhpux10"></a>
    424 
    425 <h3 class="heading"><a name="TOC17"></a>hppa*-hp-hpux10</h3>
    426 
    427 <p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch
    428 <code>PHCO_19798</code> from HP.
    429 
    430    <p>The C++ ABI has changed incompatibly in GCC 4.0.  COMDAT subspaces are
    431 used for one-only code and data.  This resolves many of the previous
    432 problems in using C++ on this target.  However, the ABI is not compatible
    433 with the one implemented under HP-UX 11 using secondary definitions.
    434 
    435    <p><hr /><a name="hppa_002dhp_002dhpux11"></a>
    436 
    437 <h3 class="heading"><a name="TOC18"></a>hppa*-hp-hpux11</h3>
    438 
    439 <p>GCC 3.0 and up support HP-UX 11.  GCC 2.95.x is not supported and cannot
    440 be used to compile GCC 3.0 and up.
    441 
    442    <p>The libffi and libjava libraries haven't been ported to 64-bit HP-UX and don't build.
    443 
    444    <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining
    445 precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
    446 to build the Ada language as it can't be bootstrapped using C.  Ada is
    447 only available for the 32-bit PA-RISC runtime.
    448 
    449    <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap.  The
    450 bundled compiler supports only traditional C; you will need either HP's
    451 unbundled compiler, or a binary distribution of GCC.
    452 
    453    <p>It is possible to build GCC 3.3 starting with the bundled HP compiler,
    454 but the process requires several steps.  GCC 3.3 can then be used to
    455 build later versions.  The fastjar program contains ISO C code and
    456 can't be built with the HP bundled compiler.  This problem can be
    457 avoided by not building the Java language.  For example, use the
    458 <samp><span class="option">--enable-languages="c,c++,f77,objc"</span></samp> option in your configure
    459 command.
    460 
    461    <p>There are several possible approaches to building the distribution. 
    462 Binutils can be built first using the HP tools.  Then, the GCC
    463 distribution can be built.  The second approach is to build GCC
    464 first using the HP tools, then build binutils, then rebuild GCC. 
    465 There have been problems with various binary distributions, so it
    466 is best not to start from a binary distribution.
    467 
    468    <p>On 64-bit capable systems, there are two distinct targets.  Different
    469 installation prefixes must be used if both are to be installed on
    470 the same system.  The &lsquo;<samp><span class="samp">hppa[1-2]*-hp-hpux11*</span></samp>&rsquo; target generates code
    471 for the 32-bit PA-RISC runtime architecture and uses the HP linker. 
    472 The &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target generates 64-bit code for the
    473 PA-RISC 2.0 architecture.
    474 
    475    <p>The script config.guess now selects the target type based on the compiler
    476 detected during configuration.  You must define <samp><span class="env">PATH</span></samp> or <samp><span class="env">CC</span></samp> so
    477 that configure finds an appropriate compiler for the initial bootstrap. 
    478 When <samp><span class="env">CC</span></samp> is used, the definition should contain the options that are
    479 needed whenever <samp><span class="env">CC</span></samp> is used.
    480 
    481    <p>Specifically, options that determine the runtime architecture must be
    482 in <samp><span class="env">CC</span></samp> to correctly select the target for the build.  It is also
    483 convenient to place many other compiler options in <samp><span class="env">CC</span></samp>.  For example,
    484 <samp><span class="env">CC="cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE"</span></samp>
    485 can be used to bootstrap the GCC 3.3 branch with the HP compiler in
    486 64-bit K&amp;R/bundled mode.  The <samp><span class="option">+DA2.0W</span></samp> option will result in
    487 the automatic selection of the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target.  The
    488 macro definition table of cpp needs to be increased for a successful
    489 build with the HP compiler.  _CLASSIC_TYPES and _HPUX_SOURCE need to
    490 be defined when building with the bundled compiler, or when using the
    491 <samp><span class="option">-Ac</span></samp> option.  These defines aren't necessary with <samp><span class="option">-Ae</span></samp>.
    492 
    493    <p>It is best to explicitly configure the &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target
    494 with the <samp><span class="option">--with-ld=...</span></samp> option.  This overrides the standard
    495 search for ld.  The two linkers supported on this target require different
    496 commands.  The default linker is determined during configuration.  As a
    497 result, it's not possible to switch linkers in the middle of a GCC build. 
    498 This has been reported to sometimes occur in unified builds of binutils
    499 and GCC.
    500 
    501    <p>A recent linker patch must be installed for the correct operation of
    502 GCC 3.3 and later.  <code>PHSS_26559</code> and <code>PHSS_24304</code> are the
    503 oldest linker patches that are known to work.  They are for HP-UX
    504 11.00 and 11.11, respectively.  <code>PHSS_24303</code>, the companion to
    505 <code>PHSS_24304</code>, might be usable but it hasn't been tested.  These
    506 patches have been superseded.  Consult the HP patch database to obtain
    507 the currently recommended linker patch for your system.
    508 
    509    <p>The patches are necessary for the support of weak symbols on the
    510 32-bit port, and for the running of initializers and finalizers.  Weak
    511 symbols are implemented using SOM secondary definition symbols.  Prior
    512 to HP-UX 11, there are bugs in the linker support for secondary symbols. 
    513 The patches correct a problem of linker core dumps creating shared
    514 libraries containing secondary symbols, as well as various other
    515 linking issues involving secondary symbols.
    516 
    517    <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to
    518 run initializers and finalizers on the 64-bit port.  The 32-bit port
    519 uses the linker <samp><span class="option">+init</span></samp> and <samp><span class="option">+fini</span></samp> options for the same
    520 purpose.  The patches correct various problems with the +init/+fini
    521 options, including program core dumps.  Binutils 2.14 corrects a
    522 problem on the 64-bit port resulting from HP's non-standard use of
    523 the .init and .fini sections for array initializers and finalizers.
    524 
    525    <p>Although the HP and GNU linkers are both supported for the
    526 &lsquo;<samp><span class="samp">hppa64-hp-hpux11*</span></samp>&rsquo; target, it is strongly recommended that the
    527 HP linker be used for link editing on this target.
    528 
    529    <p>At this time, the GNU linker does not support the creation of long
    530 branch stubs.  As a result, it can't successfully link binaries
    531 containing branch offsets larger than 8 megabytes.  In addition,
    532 there are problems linking shared libraries, linking executables
    533 with <samp><span class="option">-static</span></samp>, and with dwarf2 unwind and exception support. 
    534 It also doesn't provide stubs for internal calls to global functions
    535 in shared libraries, so these calls can't be overloaded.
    536 
    537    <p>The HP dynamic loader does not support GNU symbol versioning, so symbol
    538 versioning is not supported.  It may be necessary to disable symbol
    539 versioning with <samp><span class="option">--disable-symvers</span></samp> when using GNU ld.
    540 
    541    <p>POSIX threads are the default.  The optional DCE thread library is not
    542 supported, so <samp><span class="option">--enable-threads=dce</span></samp> does not work.
    543 
    544    <p><hr /><a name="x_002dx_002dlinux_002dgnu"></a>
    545 
    546 <h3 class="heading"><a name="TOC19"></a>*-*-linux-gnu</h3>
    547 
    548 <p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present
    549 in glibc 2.2.5 and later.  More information is available in the
    550 libstdc++-v3 documentation.
    551 
    552    <p><hr /><a name="ix86_002dx_002dlinux"></a>
    553 
    554 <h3 class="heading"><a name="TOC20"></a>i?86-*-linux*</h3>
    555 
    556 <p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform. 
    557 See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information.
    558 
    559    <p>If you receive Signal 11 errors when building on GNU/Linux, then it is
    560 possible you have a hardware problem.  Further information on this can be
    561 found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>.
    562 
    563    <p><hr /><a name="ix86_002dx_002dsolaris210"></a>
    564 
    565 <h3 class="heading"><a name="TOC21"></a>i?86-*-solaris2.10</h3>
    566 
    567 <p>Use this for Solaris 10 or later on x86 and x86-64 systems.  Starting
    568 with GCC 4.7, there is also a 64-bit &lsquo;<samp><span class="samp">amd64-*-solaris2.1[0-9]*</span></samp>&rsquo; or
    569 &lsquo;<samp><span class="samp">x86_64-*-solaris2.1[0-9]*</span></samp>&rsquo; configuration that corresponds to
    570 &lsquo;<samp><span class="samp">sparcv9-sun-solaris2*</span></samp>&rsquo;.
    571 
    572    <p>It is recommended that you configure GCC to use the GNU assembler.  The
    573 versions included in Solaris 10, from GNU binutils 2.15 (in
    574 <samp><span class="file">/usr/sfw/bin/gas</span></samp>), and Solaris 11, from GNU binutils 2.19 or
    575 newer (also available as <samp><span class="file">/usr/bin/gas</span></samp> and
    576 <samp><span class="file">/usr/gnu/bin/as</span></samp>), work fine.  Please note that the current
    577 version, from GNU binutils 2.26, only works on Solaris 12 when using the
    578 Solaris linker.  On Solaris 10 and 11, you either have to wait for GNU
    579 binutils 2.26.1 or newer, or stay with GNU binutils 2.25.1.  Recent
    580 versions of the Solaris assembler in <samp><span class="file">/usr/ccs/bin/as</span></samp> work almost
    581 as well, though. 
    582 <!-- FIXME: as patch requirements? -->
    583 
    584    <p>For linking, the Solaris linker, is preferred.  If you want to use the GNU
    585 linker instead, note that due to a packaging bug the version in Solaris
    586 10, from GNU binutils 2.15 (in <samp><span class="file">/usr/sfw/bin/gld</span></samp>), cannot be used,
    587 while the version in Solaris 11, from GNU binutils 2.19 or newer (also
    588 in <samp><span class="file">/usr/gnu/bin/ld</span></samp> and <samp><span class="file">/usr/bin/gld</span></samp>), works, as does the
    589 latest version, from GNU binutils 2.26.
    590 
    591    <p>To use GNU <samp><span class="command">as</span></samp>, configure with the options
    592 <samp><span class="option">--with-gnu-as --with-as=/usr/sfw/bin/gas</span></samp>.  It may be necessary
    593 to configure with <samp><span class="option">--without-gnu-ld --with-ld=/usr/ccs/bin/ld</span></samp> to
    594 guarantee use of Sun <samp><span class="command">ld</span></samp>. 
    595 <!-- FIXME: why -without-gnu-ld -with-ld? -->
    596 
    597    <p><hr /><a name="ia64_002dx_002dlinux"></a>
    598 
    599 <h3 class="heading"><a name="TOC22"></a>ia64-*-linux</h3>
    600 
    601 <p>IA-64 processor (also known as IPF, or Itanium Processor Family)
    602 running GNU/Linux.
    603 
    604    <p>If you are using the installed system libunwind library with
    605 <samp><span class="option">--with-system-libunwind</span></samp>, then you must use libunwind 0.98 or
    606 later.
    607 
    608    <p>None of the following versions of GCC has an ABI that is compatible
    609 with any of the other versions in this list, with the exception that
    610 Red Hat 2.96 and Trillian 000171 are compatible with each other:
    611 3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. 
    612 This primarily affects C++ programs and programs that create shared libraries. 
    613 GCC 3.1 or later is recommended for compiling linux, the kernel. 
    614 As of version 3.1 GCC is believed to be fully ABI compliant, and hence no
    615 more major ABI changes are expected.
    616 
    617    <p><hr /><a name="ia64_002dx_002dhpux"></a>
    618 
    619 <h3 class="heading"><a name="TOC23"></a>ia64-*-hpux*</h3>
    620 
    621 <p>Building GCC on this target requires the GNU Assembler.  The bundled HP
    622 assembler will not work.  To prevent GCC from using the wrong assembler,
    623 the option <samp><span class="option">--with-gnu-as</span></samp> may be necessary.
    624 
    625    <p>The GCC libunwind library has not been ported to HPUX.  This means that for
    626 GCC versions 3.2.3 and earlier, <samp><span class="option">--enable-libunwind-exceptions</span></samp>
    627 is required to build GCC.  For GCC 3.3 and later, this is the default. 
    628 For gcc 3.4.3 and later, <samp><span class="option">--enable-libunwind-exceptions</span></samp> is
    629 removed and the system libunwind library will always be used.
    630 
    631    <p><hr />
    632 <!-- rs6000-ibm-aix*, powerpc-ibm-aix* --><a name="x_002dibm_002daix"></a>
    633 
    634 <h3 class="heading"><a name="TOC24"></a>*-ibm-aix*</h3>
    635 
    636 <p>Support for AIX version 3 and older was discontinued in GCC 3.4. 
    637 Support for AIX version 4.2 and older was discontinued in GCC 4.5.
    638 
    639    <p>&ldquo;out of memory&rdquo; bootstrap failures may indicate a problem with
    640 process resource limits (ulimit).  Hard limits are configured in the
    641 <samp><span class="file">/etc/security/limits</span></samp> system configuration file.
    642 
    643    <p>GCC 4.9 and above require a C++ compiler for bootstrap.  IBM VAC++ / xlC
    644 cannot bootstrap GCC.  xlc can bootstrap an older version of GCC and
    645 G++ can bootstrap recent releases of GCC.
    646 
    647    <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping
    648 with an earlier release of GCC is recommended.  Bootstrapping with XLC
    649 requires a larger data segment, which can be enabled through the
    650 <var>LDR_CNTRL</var> environment variable, e.g.,
    651 
    652 <pre class="smallexample">     % LDR_CNTRL=MAXDATA=0x50000000
    653      % export LDR_CNTRL
    654 </pre>
    655    <p>One can start with a pre-compiled version of GCC to build from
    656 sources.  One may delete GCC's &ldquo;fixed&rdquo; header files when starting
    657 with a version of GCC built for an earlier release of AIX.
    658 
    659    <p>To speed up the configuration phases of bootstrapping and installing GCC,
    660 one may use GNU Bash instead of AIX <samp><span class="command">/bin/sh</span></samp>, e.g.,
    661 
    662 <pre class="smallexample">     % CONFIG_SHELL=/opt/freeware/bin/bash
    663      % export CONFIG_SHELL
    664 </pre>
    665    <p>and then proceed as described in <a href="build.html">the build instructions</a>, where we strongly recommend specifying an absolute path
    666 to invoke <var>srcdir</var>/configure.
    667 
    668    <p>Because GCC on AIX is built as a 32-bit executable by default,
    669 (although it can generate 64-bit programs) the GMP and MPFR libraries
    670 required by gfortran must be 32-bit libraries.  Building GMP and MPFR
    671 as static archive libraries works better than shared libraries.
    672 
    673    <p>Errors involving <code>alloca</code> when building GCC generally are due
    674 to an incorrect definition of <code>CC</code> in the Makefile or mixing files
    675 compiled with the native C compiler and GCC.  During the stage1 phase of
    676 the build, the native AIX compiler <strong>must</strong> be invoked as <samp><span class="command">cc</span></samp>
    677 (not <samp><span class="command">xlc</span></samp>).  Once <samp><span class="command">configure</span></samp> has been informed of
    678 <samp><span class="command">xlc</span></samp>, one needs to use &lsquo;<samp><span class="samp">make distclean</span></samp>&rsquo; to remove the
    679 configure cache files and ensure that <samp><span class="env">CC</span></samp> environment variable
    680 does not provide a definition that will confuse <samp><span class="command">configure</span></samp>. 
    681 If this error occurs during stage2 or later, then the problem most likely
    682 is the version of Make (see above).
    683 
    684    <p>The native <samp><span class="command">as</span></samp> and <samp><span class="command">ld</span></samp> are recommended for
    685 bootstrapping on AIX.  The GNU Assembler, GNU Linker, and GNU
    686 Binutils version 2.20 is the minimum level that supports bootstrap on
    687 AIX 5.  The GNU Assembler has not been updated to support AIX 6 or
    688 AIX 7.  The native AIX tools do interoperate with GCC.
    689 
    690    <p>AIX 7.1 added partial support for DWARF debugging, but full support
    691 requires AIX 7.1 TL03 SP7 that supports additional DWARF sections and
    692 fixes a bug in the assembler.  AIX 7.1 TL03 SP5 distributed a version
    693 of libm.a missing important symbols; a fix for IV77796 will be
    694 included in SP6.
    695 
    696    <p>AIX 5.3 TL10, AIX 6.1 TL05 and AIX 7.1 TL00 introduced an AIX
    697 assembler change that sometimes produces corrupt assembly files
    698 causing AIX linker errors.  The bug breaks GCC bootstrap on AIX and
    699 can cause compilation failures with existing GCC installations.  An
    700 AIX iFix for AIX 5.3 is available (APAR IZ98385 for AIX 5.3 TL10, APAR
    701 IZ98477 for AIX 5.3 TL11 and IZ98134 for AIX 5.3 TL12). AIX 5.3 TL11 SP8,
    702 AIX 5.3 TL12 SP5, AIX 6.1 TL04 SP11, AIX 6.1 TL05 SP7, AIX 6.1 TL06 SP6,
    703 AIX 6.1 TL07 and AIX 7.1 TL01 should include the fix.
    704 
    705    <p>Building <samp><span class="file">libstdc++.a</span></samp> requires a fix for an AIX Assembler bug
    706 APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).  It also requires a
    707 fix for another AIX Assembler bug and a co-dependent AIX Archiver fix
    708 referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1)
    709 
    710    <p><a name="TransferAixShobj"></a>&lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; in GCC 3.4 increments the major version number of the
    711 shared object and GCC installation places the <samp><span class="file">libstdc++.a</span></samp>
    712 shared library in a common location which will overwrite the and GCC
    713 3.3 version of the shared library.  Applications either need to be
    714 re-linked against the new shared library or the GCC 3.1 and GCC 3.3
    715 versions of the &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; shared object needs to be available
    716 to the AIX runtime loader.  The GCC 3.1 &lsquo;<samp><span class="samp">libstdc++.so.4</span></samp>&rsquo;, if
    717 present, and GCC 3.3 &lsquo;<samp><span class="samp">libstdc++.so.5</span></samp>&rsquo; shared objects can be
    718 installed for runtime dynamic loading using the following steps to set
    719 the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag in the shared object for <em>each</em>
    720 multilib <samp><span class="file">libstdc++.a</span></samp> installed:
    721 
    722    <p>Extract the shared objects from the currently installed
    723 <samp><span class="file">libstdc++.a</span></samp> archive:
    724 <pre class="smallexample">     % ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5
    725 </pre>
    726    <p>Enable the &lsquo;<samp><span class="samp">F_LOADONLY</span></samp>&rsquo; flag so that the shared object will be
    727 available for runtime dynamic loading, but not linking:
    728 <pre class="smallexample">     % strip -e libstdc++.so.4 libstdc++.so.5
    729 </pre>
    730    <p>Archive the runtime-only shared object in the GCC 3.4
    731 <samp><span class="file">libstdc++.a</span></samp> archive:
    732 <pre class="smallexample">     % ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5
    733 </pre>
    734    <p>Eventually, the
    735 <a href="./configure.html#WithAixSoname"><samp><span class="option">--with-aix-soname=svr4</span></samp></a>
    736 configure option may drop the need for this procedure for libraries that
    737 support it.
    738 
    739    <p>Linking executables and shared libraries may produce warnings of
    740 duplicate symbols.  The assembly files generated by GCC for AIX always
    741 have included multiple symbol definitions for certain global variable
    742 and function declarations in the original program.  The warnings should
    743 not prevent the linker from producing a correct library or runnable
    744 executable.
    745 
    746    <p>AIX 4.3 utilizes a &ldquo;large format&rdquo; archive to support both 32-bit and
    747 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
    748 to parse archive libraries did not handle the new format correctly. 
    749 These routines are used by GCC and result in error messages during
    750 linking such as &ldquo;not a COFF file&rdquo;.  The version of the routines shipped
    751 with AIX 4.3.1 should work for a 32-bit environment.  The <samp><span class="option">-g</span></samp>
    752 option of the archive command may be used to create archives of 32-bit
    753 objects using the original &ldquo;small format&rdquo;.  A correct version of the
    754 routines is shipped with AIX 4.3.2 and above.
    755 
    756    <p>Some versions of the AIX binder (linker) can fail with a relocation
    757 overflow severe error when the <samp><span class="option">-bbigtoc</span></samp> option is used to link
    758 GCC-produced object files into an executable that overflows the TOC.  A fix
    759 for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
    760 available from IBM Customer Support and from its
    761 <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    762 website as PTF U455193.
    763 
    764    <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
    765 with a segmentation fault when invoked by any version of GCC.  A fix for
    766 APAR IX87327 is available from IBM Customer Support and from its
    767 <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    768 website as PTF U461879.  This fix is incorporated in AIX 4.3.3 and above.
    769 
    770    <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object
    771 files.  A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
    772 TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
    773 <a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a>
    774 website as PTF U453956.  This fix is incorporated in AIX 4.3.1 and above.
    775 
    776    <p>AIX provides National Language Support (NLS).  Compilers and assemblers
    777 use NLS to support locale-specific representations of various data
    778 formats including floating-point numbers (e.g., &lsquo;<samp><span class="samp">.</span></samp>&rsquo;  vs &lsquo;<samp><span class="samp">,</span></samp>&rsquo; for
    779 separating decimal fractions).  There have been problems reported where
    780 GCC does not produce the same floating-point formats that the assembler
    781 expects.  If one encounters this problem, set the <samp><span class="env">LANG</span></samp>
    782 environment variable to &lsquo;<samp><span class="samp">C</span></samp>&rsquo; or &lsquo;<samp><span class="samp">En_US</span></samp>&rsquo;.
    783 
    784    <p>A default can be specified with the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    785 switch and using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    786 
    787    <p><hr /><a name="iq2000_002dx_002delf"></a>
    788 
    789 <h3 class="heading"><a name="TOC25"></a>iq2000-*-elf</h3>
    790 
    791 <p>Vitesse IQ2000 processors.  These are used in embedded
    792 applications.  There are no standard Unix configurations.
    793 
    794    <p><hr /><a name="lm32_002dx_002delf"></a>
    795 
    796 <h3 class="heading"><a name="TOC26"></a>lm32-*-elf</h3>
    797 
    798 <p>Lattice Mico32 processor. 
    799 This configuration is intended for embedded systems.
    800 
    801    <p><hr /><a name="lm32_002dx_002duclinux"></a>
    802 
    803 <h3 class="heading"><a name="TOC27"></a>lm32-*-uclinux</h3>
    804 
    805 <p>Lattice Mico32 processor. 
    806 This configuration is intended for embedded systems running uClinux.
    807 
    808    <p><hr /><a name="m32c_002dx_002delf"></a>
    809 
    810 <h3 class="heading"><a name="TOC28"></a>m32c-*-elf</h3>
    811 
    812 <p>Renesas M32C processor. 
    813 This configuration is intended for embedded systems.
    814 
    815    <p><hr /><a name="m32r_002dx_002delf"></a>
    816 
    817 <h3 class="heading"><a name="TOC29"></a>m32r-*-elf</h3>
    818 
    819 <p>Renesas M32R processor. 
    820 This configuration is intended for embedded systems.
    821 
    822    <p><hr /><a name="m68k_002dx_002dx"></a>
    823 
    824 <h3 class="heading"><a name="TOC30"></a>m68k-*-*</h3>
    825 
    826 <p>By default,
    827 &lsquo;<samp><span class="samp">m68k-*-elf*</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68k-*-rtems</span></samp>&rsquo;,  &lsquo;<samp><span class="samp">m68k-*-uclinux</span></samp>&rsquo; and
    828 &lsquo;<samp><span class="samp">m68k-*-linux</span></samp>&rsquo;
    829 build libraries for both M680x0 and ColdFire processors.  If you only
    830 need the M680x0 libraries, you can omit the ColdFire ones by passing
    831 <samp><span class="option">--with-arch=m68k</span></samp> to <samp><span class="command">configure</span></samp>.  Alternatively, you
    832 can omit the M680x0 libraries by passing <samp><span class="option">--with-arch=cf</span></samp> to
    833 <samp><span class="command">configure</span></samp>.  These targets default to 5206 or 5475 code as
    834 appropriate for the target system when
    835 configured with <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    836 
    837    <p>The &lsquo;<samp><span class="samp">m68k-*-netbsd</span></samp>&rsquo; and
    838 &lsquo;<samp><span class="samp">m68k-*-openbsd</span></samp>&rsquo; targets also support the <samp><span class="option">--with-arch</span></samp>
    839 option.  They will generate ColdFire CFV4e code when configured with
    840 <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise.
    841 
    842    <p>You can override the default processors listed above by configuring
    843 with <samp><span class="option">--with-cpu=</span><var>target</var></samp>.  This <var>target</var> can either
    844 be a <samp><span class="option">-mcpu</span></samp> argument or one of the following values:
    845 &lsquo;<samp><span class="samp">m68000</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68010</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68020</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68030</span></samp>&rsquo;,
    846 &lsquo;<samp><span class="samp">m68040</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68060</span></samp>&rsquo;, &lsquo;<samp><span class="samp">m68020-40</span></samp>&rsquo; and &lsquo;<samp><span class="samp">m68020-60</span></samp>&rsquo;.
    847 
    848    <p>GCC requires at least binutils version 2.17 on these targets.
    849 
    850    <p><hr /><a name="m68k_002dx_002duclinux"></a>
    851 
    852 <h3 class="heading"><a name="TOC31"></a>m68k-*-uclinux</h3>
    853 
    854 <p>GCC 4.3 changed the uClinux configuration so that it uses the
    855 &lsquo;<samp><span class="samp">m68k-linux-gnu</span></samp>&rsquo; ABI rather than the &lsquo;<samp><span class="samp">m68k-elf</span></samp>&rsquo; ABI. 
    856 It also added improved support for C++ and flat shared libraries,
    857 both of which were ABI changes.
    858 
    859    <p><hr /><a name="mep_002dx_002delf"></a>
    860 
    861 <h3 class="heading"><a name="TOC32"></a>mep-*-elf</h3>
    862 
    863 <p>Toshiba Media embedded Processor. 
    864 This configuration is intended for embedded systems.
    865 
    866    <p><hr /><a name="microblaze_002dx_002delf"></a>
    867 
    868 <h3 class="heading"><a name="TOC33"></a>microblaze-*-elf</h3>
    869 
    870 <p>Xilinx MicroBlaze processor. 
    871 This configuration is intended for embedded systems.
    872 
    873    <p><hr /><a name="mips_002dx_002dx"></a>
    874 
    875 <h3 class="heading"><a name="TOC34"></a>mips-*-*</h3>
    876 
    877 <p>If on a MIPS system you get an error message saying &ldquo;does not have gp
    878 sections for all it's [sic] sectons [sic]&rdquo;, don't worry about it.  This
    879 happens whenever you use GAS with the MIPS linker, but there is not
    880 really anything wrong, and it is okay to use the output file.  You can
    881 stop such warnings by installing the GNU linker.
    882 
    883    <p>It would be nice to extend GAS to produce the gp tables, but they are
    884 optional, and there should not be a warning about their absence.
    885 
    886    <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II
    887 and later.  A patch went in just after the GCC 3.3 release to
    888 make &lsquo;<samp><span class="samp">mips*-*-*</span></samp>&rsquo; use the generic implementation instead.  You can also
    889 configure for &lsquo;<samp><span class="samp">mipsel-elf</span></samp>&rsquo; as a workaround.  The
    890 &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; target continues to use the MIPS II routines.  More
    891 work on this is expected in future releases.
    892 
    893 <!-- If you make -with-llsc the default for another target, please also -->
    894 <!-- update the description of the -with-llsc option. -->
    895    <p>The built-in <code>__sync_*</code> functions are available on MIPS II and
    896 later systems and others that support the &lsquo;<samp><span class="samp">ll</span></samp>&rsquo;, &lsquo;<samp><span class="samp">sc</span></samp>&rsquo; and
    897 &lsquo;<samp><span class="samp">sync</span></samp>&rsquo; instructions.  This can be overridden by passing
    898 <samp><span class="option">--with-llsc</span></samp> or <samp><span class="option">--without-llsc</span></samp> when configuring GCC. 
    899 Since the Linux kernel emulates these instructions if they are
    900 missing, the default for &lsquo;<samp><span class="samp">mips*-*-linux*</span></samp>&rsquo; targets is
    901 <samp><span class="option">--with-llsc</span></samp>.  The <samp><span class="option">--with-llsc</span></samp> and
    902 <samp><span class="option">--without-llsc</span></samp> configure options may be overridden at compile
    903 time by passing the <samp><span class="option">-mllsc</span></samp> or <samp><span class="option">-mno-llsc</span></samp> options to
    904 the compiler.
    905 
    906    <p>MIPS systems check for division by zero (unless
    907 <samp><span class="option">-mno-check-zero-division</span></samp> is passed to the compiler) by
    908 generating either a conditional trap or a break instruction.  Using
    909 trap results in smaller code, but is only supported on MIPS II and
    910 later.  Also, some versions of the Linux kernel have a bug that
    911 prevents trap from generating the proper signal (<code>SIGFPE</code>).  To enable
    912 the use of break, use the <samp><span class="option">--with-divide=breaks</span></samp>
    913 <samp><span class="command">configure</span></samp> option when configuring GCC.  The default is to
    914 use traps on systems that support them.
    915 
    916    <p>The assembler from GNU binutils 2.17 and earlier has a bug in the way
    917 it sorts relocations for REL targets (o32, o64, EABI).  This can cause
    918 bad code to be generated for simple C++ programs.  Also the linker
    919 from GNU binutils versions prior to 2.17 has a bug which causes the
    920 runtime linker stubs in very large programs, like <samp><span class="file">libgcj.so</span></samp>, to
    921 be incorrectly generated.  GNU Binutils 2.18 and later (and snapshots
    922 made after Nov. 9, 2006) should be free from both of these problems.
    923 
    924    <p><hr /><a name="mips_002dsgi_002dirix5"></a>
    925 
    926 <h3 class="heading"><a name="TOC35"></a>mips-sgi-irix5</h3>
    927 
    928 <p>Support for IRIX 5 has been removed in GCC 4.6.
    929 
    930    <p><hr /><a name="mips_002dsgi_002dirix6"></a>
    931 
    932 <h3 class="heading"><a name="TOC36"></a>mips-sgi-irix6</h3>
    933 
    934 <p>Support for IRIX 6.5 has been removed in GCC 4.8.  Support for IRIX 6
    935 releases before 6.5 has been removed in GCC 4.6, as well as support for
    936 the O32 ABI.
    937 
    938    <p><hr /><a name="moxie_002dx_002delf"></a>
    939 
    940 <h3 class="heading"><a name="TOC37"></a>moxie-*-elf</h3>
    941 
    942 <p>The moxie processor.
    943 
    944    <p><hr /><a name="msp430_002dx_002delf"></a>
    945 
    946 <h3 class="heading"><a name="TOC38"></a>msp430-*-elf</h3>
    947 
    948 <p>TI MSP430 processor. 
    949 This configuration is intended for embedded systems.
    950 
    951    <p><hr /><a name="nds32le_002dx_002delf"></a>
    952 
    953 <h3 class="heading"><a name="TOC39"></a>nds32le-*-elf</h3>
    954 
    955 <p>Andes NDS32 target in little endian mode.
    956 
    957    <p><hr /><a name="nds32be_002dx_002delf"></a>
    958 
    959 <h3 class="heading"><a name="TOC40"></a>nds32be-*-elf</h3>
    960 
    961 <p>Andes NDS32 target in big endian mode.
    962 
    963    <p><hr /><a name="nvptx_002dx_002dnone"></a>
    964 
    965 <h3 class="heading"><a name="TOC41"></a>nvptx-*-none</h3>
    966 
    967 <p>Nvidia PTX target.
    968 
    969    <p>Instead of GNU binutils, you will need to install
    970 <a href="https://github.com/MentorEmbedded/nvptx-tools/">nvptx-tools</a>. 
    971 Tell GCC where to find it:
    972 <samp><span class="option">--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin</span></samp>.
    973 
    974    <p>A nvptx port of newlib is available at
    975 <a href="https://github.com/MentorEmbedded/nvptx-newlib/">nvptx-newlib</a>. 
    976 It can be automatically built together with GCC.  For this, add a
    977 symbolic link to nvptx-newlib's <samp><span class="file">newlib</span></samp> directory to the
    978 directory containing the GCC sources.
    979 
    980    <p>Use the <samp><span class="option">--disable-sjlj-exceptions</span></samp> and
    981 <samp><span class="option">--enable-newlib-io-long-long</span></samp> options when configuring.
    982 
    983    <p><hr /><a name="powerpc_002dx_002dx"></a>
    984 
    985 <h3 class="heading"><a name="TOC42"></a>powerpc-*-*</h3>
    986 
    987 <p>You can specify a default version for the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp>
    988 switch by using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>.
    989 
    990    <p>You will need
    991 <a href="ftp://ftp.kernel.org/pub/linux/devel/binutils">binutils 2.15</a>
    992 or newer for a working GCC.
    993 
    994    <p><hr /><a name="powerpc_002dx_002ddarwin"></a>
    995 
    996 <h3 class="heading"><a name="TOC43"></a>powerpc-*-darwin*</h3>
    997 
    998 <p>PowerPC running Darwin (Mac OS X kernel).
    999 
   1000    <p>Pre-installed versions of Mac OS X may not include any developer tools,
   1001 meaning that you will not be able to build GCC from source.  Tool
   1002 binaries are available at
   1003 <a href="http://opensource.apple.com/">http://opensource.apple.com/</a>.
   1004 
   1005    <p>This version of GCC requires at least cctools-590.36.  The
   1006 cctools-590.36 package referenced from
   1007 <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
   1008 on systems older than 10.3.9 (aka darwin7.9.0).
   1009 
   1010    <p><hr /><a name="powerpc_002dx_002delf"></a>
   1011 
   1012 <h3 class="heading"><a name="TOC44"></a>powerpc-*-elf</h3>
   1013 
   1014 <p>PowerPC system in big endian mode, running System V.4.
   1015 
   1016    <p><hr /><a name="powerpc_002dx_002dlinux_002dgnu"></a>
   1017 
   1018 <h3 class="heading"><a name="TOC45"></a>powerpc*-*-linux-gnu*</h3>
   1019 
   1020 <p>PowerPC system in big endian mode running Linux.
   1021 
   1022    <p><hr /><a name="powerpc_002dx_002dnetbsd"></a>
   1023 
   1024 <h3 class="heading"><a name="TOC46"></a>powerpc-*-netbsd*</h3>
   1025 
   1026 <p>PowerPC system in big endian mode running NetBSD.
   1027 
   1028    <p><hr /><a name="powerpc_002dx_002deabisim"></a>
   1029 
   1030 <h3 class="heading"><a name="TOC47"></a>powerpc-*-eabisim</h3>
   1031 
   1032 <p>Embedded PowerPC system in big endian mode for use in running under the
   1033 PSIM simulator.
   1034 
   1035    <p><hr /><a name="powerpc_002dx_002deabi"></a>
   1036 
   1037 <h3 class="heading"><a name="TOC48"></a>powerpc-*-eabi</h3>
   1038 
   1039 <p>Embedded PowerPC system in big endian mode.
   1040 
   1041    <p><hr /><a name="powerpcle_002dx_002delf"></a>
   1042 
   1043 <h3 class="heading"><a name="TOC49"></a>powerpcle-*-elf</h3>
   1044 
   1045 <p>PowerPC system in little endian mode, running System V.4.
   1046 
   1047    <p><hr /><a name="powerpcle_002dx_002deabisim"></a>
   1048 
   1049 <h3 class="heading"><a name="TOC50"></a>powerpcle-*-eabisim</h3>
   1050 
   1051 <p>Embedded PowerPC system in little endian mode for use in running under
   1052 the PSIM simulator.
   1053 
   1054    <p><hr /><a name="powerpcle_002dx_002deabi"></a>
   1055 
   1056 <h3 class="heading"><a name="TOC51"></a>powerpcle-*-eabi</h3>
   1057 
   1058 <p>Embedded PowerPC system in little endian mode.
   1059 
   1060    <p><hr /><a name="rl78_002dx_002delf"></a>
   1061 
   1062 <h3 class="heading"><a name="TOC52"></a>rl78-*-elf</h3>
   1063 
   1064 <p>The Renesas RL78 processor. 
   1065 This configuration is intended for embedded systems.
   1066 
   1067    <p><hr /><a name="rx_002dx_002delf"></a>
   1068 
   1069 <h3 class="heading"><a name="TOC53"></a>rx-*-elf</h3>
   1070 
   1071 <p>The Renesas RX processor.  See
   1072 <a href="http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series">http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series</a>
   1073 for more information about this processor.
   1074 
   1075    <p><hr /><a name="s390_002dx_002dlinux"></a>
   1076 
   1077 <h3 class="heading"><a name="TOC54"></a>s390-*-linux*</h3>
   1078 
   1079 <p>S/390 system running GNU/Linux for S/390.
   1080 
   1081    <p><hr /><a name="s390x_002dx_002dlinux"></a>
   1082 
   1083 <h3 class="heading"><a name="TOC55"></a>s390x-*-linux*</h3>
   1084 
   1085 <p>zSeries system (64-bit) running GNU/Linux for zSeries.
   1086 
   1087    <p><hr /><a name="s390x_002dibm_002dtpf"></a>
   1088 
   1089 <h3 class="heading"><a name="TOC56"></a>s390x-ibm-tpf*</h3>
   1090 
   1091 <p>zSeries system (64-bit) running TPF.  This platform is
   1092 supported as cross-compilation target only.
   1093 
   1094    <p><hr /><!-- Please use Solaris 2 to refer to all release of Solaris, starting -->
   1095 <!-- with 2.0 until 2.6, 7, 8, etc.  Solaris 1 was a marketing name for -->
   1096 <!-- SunOS 4 releases which we don't use to avoid confusion.  Solaris -->
   1097 <!-- alone is too unspecific and must be avoided. -->
   1098 <a name="x_002dx_002dsolaris2"></a>
   1099 
   1100 <h3 class="heading"><a name="TOC57"></a>*-*-solaris2*</h3>
   1101 
   1102 <p>Support for Solaris 9 has been removed in GCC 5.  Support for Solaris
   1103 8 has been removed in GCC 4.8.  Support for Solaris 7 has been removed
   1104 in GCC 4.6.
   1105 
   1106    <p>Sun does not ship a C compiler with Solaris 2 before Solaris 10, though
   1107 you can download the Sun Studio compilers for free.  In Solaris 10 and
   1108 11, GCC 3.4.3 is available as <samp><span class="command">/usr/sfw/bin/gcc</span></samp>.  Solaris 11
   1109 also provides GCC 4.5.2, 4.7.3, and 4.8.2 as
   1110 <samp><span class="command">/usr/gcc/4.5/bin/gcc</span></samp> or similar.  Alternatively,
   1111 you can install a pre-built GCC to bootstrap and install GCC.  See the
   1112 <a href="binaries.html">binaries page</a> for details.
   1113 
   1114    <p>The Solaris 2 <samp><span class="command">/bin/sh</span></samp> will often fail to configure
   1115 &lsquo;<samp><span class="samp">libstdc++-v3</span></samp>&rsquo;, &lsquo;<samp><span class="samp">boehm-gc</span></samp>&rsquo; or &lsquo;<samp><span class="samp">libjava</span></samp>&rsquo;.  We therefore
   1116 recommend using the following initial sequence of commands
   1117 
   1118 <pre class="smallexample">     % CONFIG_SHELL=/bin/ksh
   1119      % export CONFIG_SHELL
   1120 </pre>
   1121    <p class="noindent">and proceed as described in <a href="configure.html">the configure instructions</a>. 
   1122 In addition we strongly recommend specifying an absolute path to invoke
   1123 <samp><var>srcdir</var><span class="command">/configure</span></samp>.
   1124 
   1125    <p>Solaris 10 comes with a number of optional OS packages.  Some of these
   1126 are needed to use GCC fully, namely <code>SUNWarc</code>,
   1127 <code>SUNWbtool</code>, <code>SUNWesu</code>, <code>SUNWhea</code>, <code>SUNWlibm</code>,
   1128 <code>SUNWsprot</code>, and <code>SUNWtoo</code>.  If you did not install all
   1129 optional packages when installing Solaris 10, you will need to verify that
   1130 the packages that GCC needs are installed. 
   1131 To check whether an optional package is installed, use
   1132 the <samp><span class="command">pkginfo</span></samp> command.  To add an optional package, use the
   1133 <samp><span class="command">pkgadd</span></samp> command.  For further details, see the Solaris 10
   1134 documentation.
   1135 
   1136    <p>Starting with Solaris 11, the package management has changed, so you
   1137 need to check for <code>system/header</code>, <code>system/linker</code>, and
   1138 <code>developer/assembler</code> packages.  Checking for and installing
   1139 packages is done with the <samp><span class="command">pkg</span></samp> command now.
   1140 
   1141    <p>Trying to use the linker and other tools in
   1142 <samp><span class="file">/usr/ucb</span></samp> to install GCC has been observed to cause trouble. 
   1143 For example, the linker may hang indefinitely.  The fix is to remove
   1144 <samp><span class="file">/usr/ucb</span></samp> from your <samp><span class="env">PATH</span></samp>.
   1145 
   1146    <p>The build process works more smoothly with the legacy Sun tools so, if you
   1147 have <samp><span class="file">/usr/xpg4/bin</span></samp> in your <samp><span class="env">PATH</span></samp>, we recommend that you place
   1148 <samp><span class="file">/usr/bin</span></samp> before <samp><span class="file">/usr/xpg4/bin</span></samp> for the duration of the build.
   1149 
   1150    <p>We recommend the use of the Solaris assembler or the GNU assembler, in
   1151 conjunction with the Solaris linker.  The GNU <samp><span class="command">as</span></samp>
   1152 versions included in Solaris 10, from GNU binutils 2.15 (in
   1153 <samp><span class="file">/usr/sfw/bin/gas</span></samp>), and Solaris 11,
   1154 from GNU binutils 2.19 or newer (also in <samp><span class="file">/usr/bin/gas</span></samp> and
   1155 <samp><span class="file">/usr/gnu/bin/as</span></samp>), are known to work. 
   1156 Current versions of GNU binutils (2.26)
   1157 are known to work as well, with the caveat mentioned in
   1158 <a href="#ix86-x-solaris210">i?86-*-solaris2.10</a> .  Note that your mileage may vary
   1159 if you use a combination of the GNU tools and the Solaris tools: while the
   1160 combination GNU <samp><span class="command">as</span></samp> + Sun <samp><span class="command">ld</span></samp> should reasonably work,
   1161 the reverse combination Sun <samp><span class="command">as</span></samp> + GNU <samp><span class="command">ld</span></samp> may fail to
   1162 build or cause memory corruption at runtime in some cases for C++ programs. 
   1163 <!-- FIXME: still? -->
   1164 GNU <samp><span class="command">ld</span></samp> usually works as well, although the version included in
   1165 Solaris 10 cannot be used due to several bugs.  Again, the current
   1166 version (2.26) is known to work, but generally lacks platform specific
   1167 features, so better stay with Solaris <samp><span class="command">ld</span></samp>.  To use the LTO linker
   1168 plugin (<samp><span class="option">-fuse-linker-plugin</span></samp>) with GNU <samp><span class="command">ld</span></samp>, GNU
   1169 binutils <em>must</em> be configured with <samp><span class="option">--enable-largefile</span></samp>.
   1170 
   1171    <p>To enable symbol versioning in &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; with the Solaris linker,
   1172 you need to have any version of GNU <samp><span class="command">c++filt</span></samp>, which is part of
   1173 GNU binutils.  &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo; symbol versioning will be disabled if no
   1174 appropriate version is found.  Solaris <samp><span class="command">c++filt</span></samp> from the Solaris
   1175 Studio compilers does <em>not</em> work.
   1176 
   1177    <p>GNU <samp><span class="command">make</span></samp> version 3.81 or later is required to build libjava
   1178 with the Solaris linker.
   1179 
   1180    <p>Sun bug 4927647 sometimes causes random spurious testsuite failures
   1181 related to missing diagnostic output.  This bug doesn't affect GCC
   1182 itself, rather it is a kernel bug triggered by the <samp><span class="command">expect</span></samp>
   1183 program which is used only by the GCC testsuite driver.  When the bug
   1184 causes the <samp><span class="command">expect</span></samp> program to miss anticipated output, extra
   1185 testsuite failures appear.
   1186 
   1187    <p><hr /><a name="sparc_002dx_002dx"></a>
   1188 
   1189 <h3 class="heading"><a name="TOC58"></a>sparc*-*-*</h3>
   1190 
   1191 <p>This section contains general configuration information for all
   1192 SPARC-based platforms.  In addition to reading this section, please
   1193 read all other sections that match your target.
   1194 
   1195    <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR
   1196 library and the MPC library are known to be miscompiled by earlier
   1197 versions of GCC on these platforms.  We therefore recommend the use
   1198 of the exact versions of these libraries listed as minimal versions
   1199 in <a href="prerequisites.html">the prerequisites</a>.
   1200 
   1201    <p><hr /><a name="sparc_002dsun_002dsolaris2"></a>
   1202 
   1203 <h3 class="heading"><a name="TOC59"></a>sparc-sun-solaris2*</h3>
   1204 
   1205 <p>When GCC is configured to use GNU binutils 2.14 or later, the binaries
   1206 produced are smaller than the ones produced using Sun's native tools;
   1207 this difference is quite significant for binaries containing debugging
   1208 information.
   1209 
   1210    <p>Starting with Solaris 7, the operating system is capable of executing
   1211 64-bit SPARC V9 binaries.  GCC 3.1 and later properly supports
   1212 this; the <samp><span class="option">-m64</span></samp> option enables 64-bit code generation. 
   1213 However, if all you want is code tuned for the UltraSPARC CPU, you
   1214 should try the <samp><span class="option">-mtune=ultrasparc</span></samp> option instead, which produces
   1215 code that, unlike full 64-bit code, can still run on non-UltraSPARC
   1216 machines.
   1217 
   1218    <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1219 library or the MPC library on a Solaris 7 or later system, the canonical
   1220 target triplet must be specified as the <samp><span class="command">build</span></samp> parameter on the
   1221 configure line.  This target triplet can be obtained by invoking <samp><span class="command">./config.guess</span></samp> in the toplevel source directory of GCC (and
   1222 not that of GMP or MPFR or MPC).  For example on a Solaris 9 system:
   1223 
   1224 <pre class="smallexample">     % ./configure --build=sparc-sun-solaris2.9 --prefix=xxx
   1225 </pre>
   1226    <p><hr /><a name="sparc_002dsun_002dsolaris210"></a>
   1227 
   1228 <h3 class="heading"><a name="TOC60"></a>sparc-sun-solaris2.10</h3>
   1229 
   1230 <p>There is a bug in older versions of the Sun assembler which breaks
   1231 thread-local storage (TLS).  A typical error message is
   1232 
   1233 <pre class="smallexample">     ld: fatal: relocation error: R_SPARC_TLS_LE_HIX22: file /var/tmp//ccamPA1v.o:
   1234        symbol &lt;unknown&gt;: bad symbol type SECT: symbol type must be TLS
   1235 </pre>
   1236    <p class="noindent">This bug is fixed in Sun patch 118683-03 or later.
   1237 
   1238    <p><hr /><a name="sparc_002dx_002dlinux"></a>
   1239 
   1240 <h3 class="heading"><a name="TOC61"></a>sparc-*-linux*</h3>
   1241 
   1242 <p>GCC versions 3.0 and higher require binutils 2.11.2 and glibc 2.2.4
   1243 or newer on this platform.  All earlier binutils and glibc
   1244 releases mishandled unaligned relocations on <code>sparc-*-*</code> targets.
   1245 
   1246    <p><hr /><a name="sparc64_002dx_002dsolaris2"></a>
   1247 
   1248 <h3 class="heading"><a name="TOC62"></a>sparc64-*-solaris2*</h3>
   1249 
   1250 <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR
   1251 library or the MPC library, the canonical target triplet must be specified
   1252 as the <samp><span class="command">build</span></samp> parameter on the configure line.  For example
   1253 on a Solaris 9 system:
   1254 
   1255 <pre class="smallexample">     % ./configure --build=sparc64-sun-solaris2.9 --prefix=xxx
   1256 </pre>
   1257    <p><hr /><a name="sparcv9_002dx_002dsolaris2"></a>
   1258 
   1259 <h3 class="heading"><a name="TOC63"></a>sparcv9-*-solaris2*</h3>
   1260 
   1261 <p>This is a synonym for &lsquo;<samp><span class="samp">sparc64-*-solaris2*</span></samp>&rsquo;.
   1262 
   1263    <p><hr /><a name="c6x_002dx_002dx"></a>
   1264 
   1265 <h3 class="heading"><a name="TOC64"></a>c6x-*-*</h3>
   1266 
   1267 <p>The C6X family of processors. This port requires binutils-2.22 or newer.
   1268 
   1269    <p><hr /><a name="tilegx_002d_002a_002dlinux"></a>
   1270 
   1271 <h3 class="heading"><a name="TOC65"></a>tilegx-*-linux*</h3>
   1272 
   1273 <p>The TILE-Gx processor in little endian mode, running GNU/Linux.  This
   1274 port requires binutils-2.22 or newer.
   1275 
   1276    <p><hr /><a name="tilegxbe_002d_002a_002dlinux"></a>
   1277 
   1278 <h3 class="heading"><a name="TOC66"></a>tilegxbe-*-linux*</h3>
   1279 
   1280 <p>The TILE-Gx processor in big endian mode, running GNU/Linux.  This
   1281 port requires binutils-2.23 or newer.
   1282 
   1283    <p><hr /><a name="tilepro_002d_002a_002dlinux"></a>
   1284 
   1285 <h3 class="heading"><a name="TOC67"></a>tilepro-*-linux*</h3>
   1286 
   1287 <p>The TILEPro processor running GNU/Linux.  This port requires
   1288 binutils-2.22 or newer.
   1289 
   1290    <p><hr /><a name="visium_002dx_002delf"></a>
   1291 
   1292 <h3 class="heading"><a name="TOC68"></a>visium-*-elf</h3>
   1293 
   1294 <p>CDS VISIUMcore processor. 
   1295 This configuration is intended for embedded systems.
   1296 
   1297    <p><hr /><a name="x_002dx_002dvxworks"></a>
   1298 
   1299 <h3 class="heading"><a name="TOC69"></a>*-*-vxworks*</h3>
   1300 
   1301 <p>Support for VxWorks is in flux.  At present GCC supports <em>only</em> the
   1302 very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC. 
   1303 We welcome patches for other architectures supported by VxWorks 5.5. 
   1304 Support for VxWorks AE would also be welcome; we believe this is merely
   1305 a matter of writing an appropriate &ldquo;configlette&rdquo; (see below).  We are
   1306 not interested in supporting older, a.out or COFF-based, versions of
   1307 VxWorks in GCC 3.
   1308 
   1309    <p>VxWorks comes with an older version of GCC installed in
   1310 <samp><var>$WIND_BASE</var><span class="file">/host</span></samp>; we recommend you do not overwrite it. 
   1311 Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>. 
   1312 Before running <samp><span class="command">configure</span></samp>, create the directories <samp><var>prefix</var></samp>
   1313 and <samp><var>prefix</var><span class="file">/bin</span></samp>.  Link or copy the appropriate assembler,
   1314 linker, etc. into <samp><var>prefix</var><span class="file">/bin</span></samp>, and set your <var>PATH</var> to
   1315 include that directory while running both <samp><span class="command">configure</span></samp> and
   1316 <samp><span class="command">make</span></samp>.
   1317 
   1318    <p>You must give <samp><span class="command">configure</span></samp> the
   1319 <samp><span class="option">--with-headers=</span><var>$WIND_BASE</var><span class="option">/target/h</span></samp> switch so that it can
   1320 find the VxWorks system headers.  Since VxWorks is a cross compilation
   1321 target only, you must also specify <samp><span class="option">--target=</span><var>target</var></samp>. 
   1322 <samp><span class="command">configure</span></samp> will attempt to create the directory
   1323 <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> and copy files into it;
   1324 make sure the user running <samp><span class="command">configure</span></samp> has sufficient privilege
   1325 to do so.
   1326 
   1327    <p>GCC's exception handling runtime requires a special &ldquo;configlette&rdquo;
   1328 module, <samp><span class="file">contrib/gthr_supp_vxw_5x.c</span></samp>.  Follow the instructions in
   1329 that file to add the module to your kernel build.  (Future versions of
   1330 VxWorks will incorporate this module.)
   1331 
   1332    <p><hr /><a name="x86_002d64_002dx_002dx"></a>
   1333 
   1334 <h3 class="heading"><a name="TOC70"></a>x86_64-*-*, amd64-*-*</h3>
   1335 
   1336 <p>GCC supports the x86-64 architecture implemented by the AMD64 processor
   1337 (amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD. 
   1338 On GNU/Linux the default is a bi-arch compiler which is able to generate
   1339 both 64-bit x86-64 and 32-bit x86 code (via the <samp><span class="option">-m32</span></samp> switch).
   1340 
   1341    <p><hr /><a name="x86_002d64_002dx_002dsolaris210"></a>
   1342 
   1343 <h3 class="heading"><a name="TOC71"></a>x86_64-*-solaris2.1[0-9]*</h3>
   1344 
   1345 <p>GCC also supports the x86-64 architecture implemented by the AMD64
   1346 processor (&lsquo;<samp><span class="samp">amd64-*-*</span></samp>&rsquo; is an alias for &lsquo;<samp><span class="samp">x86_64-*-*</span></samp>&rsquo;) on
   1347 Solaris 10 or later.  Unlike other systems, without special options a
   1348 bi-arch compiler is built which generates 32-bit code by default, but
   1349 can generate 64-bit x86-64 code with the <samp><span class="option">-m64</span></samp> switch.  Since
   1350 GCC 4.7, there is also a configuration that defaults to 64-bit code, but
   1351 can generate 32-bit code with <samp><span class="option">-m32</span></samp>.  To configure and build
   1352 this way, you have to provide all support libraries like <samp><span class="file">libgmp</span></samp>
   1353 as 64-bit code, configure with <samp><span class="option">--target=x86_64-pc-solaris2.1x</span></samp>
   1354 and &lsquo;<samp><span class="samp">CC=gcc -m64</span></samp>&rsquo;.
   1355 
   1356    <p><hr /><a name="xtensa_002dx_002delf"></a>
   1357 
   1358 <h3 class="heading"><a name="TOC72"></a>xtensa*-*-elf</h3>
   1359 
   1360 <p>This target is intended for embedded Xtensa systems using the
   1361 &lsquo;<samp><span class="samp">newlib</span></samp>&rsquo; C library.  It uses ELF but does not support shared
   1362 objects.  Designed-defined instructions specified via the
   1363 Tensilica Instruction Extension (TIE) language are only supported
   1364 through inline assembly.
   1365 
   1366    <p>The Xtensa configuration information must be specified prior to
   1367 building GCC.  The <samp><span class="file">include/xtensa-config.h</span></samp> header
   1368 file contains the configuration information.  If you created your
   1369 own Xtensa configuration with the Xtensa Processor Generator, the
   1370 downloaded files include a customized copy of this header file,
   1371 which you can use to replace the default header file.
   1372 
   1373    <p><hr /><a name="xtensa_002dx_002dlinux"></a>
   1374 
   1375 <h3 class="heading"><a name="TOC73"></a>xtensa*-*-linux*</h3>
   1376 
   1377 <p>This target is for Xtensa systems running GNU/Linux.  It supports ELF
   1378 shared objects and the GNU C library (glibc).  It also generates
   1379 position-independent code (PIC) regardless of whether the
   1380 <samp><span class="option">-fpic</span></samp> or <samp><span class="option">-fPIC</span></samp> options are used.  In other
   1381 respects, this target is the same as the
   1382 <a href="#xtensa*-*-elf">&lsquo;<samp><span class="samp">xtensa*-*-elf</span></samp>&rsquo;</a> target.
   1383 
   1384    <p><hr /><a name="windows"></a>
   1385 
   1386 <h3 class="heading"><a name="TOC74"></a>Microsoft Windows</h3>
   1387 
   1388 <h4 class="subheading"><a name="TOC75"></a>Intel 16-bit versions</h4>
   1389 
   1390 <p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not
   1391 supported.
   1392 
   1393    <p>However, the 32-bit port has limited support for Microsoft
   1394 Windows 3.11 in the Win32s environment, as a target only.  See below.
   1395 
   1396 <h4 class="subheading"><a name="TOC76"></a>Intel 32-bit versions</h4>
   1397 
   1398 <p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows
   1399 XP, and Windows Vista, are supported by several different target
   1400 platforms.  These targets differ in which Windows subsystem they target
   1401 and which C libraries are used.
   1402 
   1403      <ul>
   1404 <li>Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space
   1405 Linux API emulation layer in the Win32 subsystem. 
   1406 <li>Interix <a href="#x-x-interix">*-*-interix</a>: The Interix subsystem
   1407 provides native support for POSIX. 
   1408 <li>MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for
   1409 the Win32 subsystem that provides a subset of POSIX. 
   1410 <li>MKS i386-pc-mks: NuTCracker from MKS.  See
   1411 <a href="http://www.mkssoftware.com/">http://www.mkssoftware.com/</a> for more information. 
   1412 </ul>
   1413 
   1414 <h4 class="subheading"><a name="TOC77"></a>Intel 64-bit versions</h4>
   1415 
   1416 <p>GCC contains support for x86-64 using the mingw-w64
   1417 runtime library, available from <a href="http://mingw-w64.sourceforge.net/">http://mingw-w64.sourceforge.net/</a>. 
   1418 This library should be used with the target triple x86_64-pc-mingw32.
   1419 
   1420    <p>Presently Windows for Itanium is not supported.
   1421 
   1422 <h4 class="subheading"><a name="TOC78"></a>Windows CE</h4>
   1423 
   1424 <p>Windows CE is supported as a target only on Hitachi
   1425 SuperH (sh-wince-pe), and MIPS (mips-wince-pe).
   1426 
   1427 <h4 class="subheading"><a name="TOC79"></a>Other Windows Platforms</h4>
   1428 
   1429 <p>GCC no longer supports Windows NT on the Alpha or PowerPC.
   1430 
   1431    <p>GCC no longer supports the Windows POSIX subsystem.  However, it does
   1432 support the Interix subsystem.  See above.
   1433 
   1434    <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used.
   1435 
   1436    <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to
   1437 be inactive.  See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information.
   1438 
   1439    <p>UWIN support has been removed due to a lack of maintenance.
   1440 
   1441    <p><hr /><a name="x_002dx_002dcygwin"></a>
   1442 
   1443 <h3 class="heading"><a name="TOC80"></a>*-*-cygwin</h3>
   1444 
   1445 <p>Ports of GCC are included with the
   1446 <a href="http://www.cygwin.com/">Cygwin environment</a>.
   1447 
   1448    <p>GCC will build under Cygwin without modification; it does not build
   1449 with Microsoft's C++ compiler and there are no plans to make it do so.
   1450 
   1451    <p>The Cygwin native compiler can be configured to target any 32-bit x86
   1452 cpu architecture desired; the default is i686-pc-cygwin.  It should be
   1453 used with as up-to-date a version of binutils as possible; use either
   1454 the latest official GNU binutils release in the Cygwin distribution,
   1455 or version 2.20 or above if building your own.
   1456 
   1457    <p><hr /><a name="x_002dx_002dinterix"></a>
   1458 
   1459 <h3 class="heading"><a name="TOC81"></a>*-*-interix</h3>
   1460 
   1461 <p>The Interix target is used by OpenNT, Interix, Services For UNIX (SFU),
   1462 and Subsystem for UNIX-based Applications (SUA).  Applications compiled
   1463 with this target run in the Interix subsystem, which is separate from
   1464 the Win32 subsystem.  This target was last known to work in GCC 3.3.
   1465 
   1466    <p><hr /><a name="x_002dx_002dmingw32"></a>
   1467 
   1468 <h3 class="heading"><a name="TOC82"></a>*-*-mingw32</h3>
   1469 
   1470 <p>GCC will build with and support only MinGW runtime 3.12 and later. 
   1471 Earlier versions of headers are incompatible with the new default semantics
   1472 of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes.
   1473 
   1474    <p><hr /><a name="older"></a>
   1475 
   1476 <h3 class="heading"><a name="TOC83"></a>Older systems</h3>
   1477 
   1478 <p>GCC contains support files for many older (1980s and early
   1479 1990s) Unix variants.  For the most part, support for these systems
   1480 has not been deliberately removed, but it has not been maintained for
   1481 several years and may suffer from bitrot.
   1482 
   1483    <p>Starting with GCC 3.1, each release has a list of &ldquo;obsoleted&rdquo; systems. 
   1484 Support for these systems is still present in that release, but
   1485 <samp><span class="command">configure</span></samp> will fail unless the <samp><span class="option">--enable-obsolete</span></samp>
   1486 option is given.  Unless a maintainer steps forward, support for these
   1487 systems will be removed from the next release of GCC.
   1488 
   1489    <p>Support for old systems as hosts for GCC can cause problems if the
   1490 workarounds for compiler, library and operating system bugs affect the
   1491 cleanliness or maintainability of the rest of GCC.  In some cases, to
   1492 bring GCC up on such a system, if still possible with current GCC, may
   1493 require first installing an old version of GCC which did work on that
   1494 system, and using it to compile a more recent GCC, to avoid bugs in the
   1495 vendor compiler.  Old releases of GCC 1 and GCC 2 are available in the
   1496 <samp><span class="file">old-releases</span></samp> directory on the <a href="../mirrors.html">GCC mirror sites</a>.  Header bugs may generally be avoided using
   1497 <samp><span class="command">fixincludes</span></samp>, but bugs or deficiencies in libraries and the
   1498 operating system may still cause problems.
   1499 
   1500    <p>Support for older systems as targets for cross-compilation is less
   1501 problematic than support for them as hosts for GCC; if an enthusiast
   1502 wishes to make such a target work again (including resurrecting any of
   1503 the targets that never worked with GCC 2, starting from the last
   1504 version before they were removed), patches
   1505 <a href="../contribute.html">following the usual requirements</a> would be
   1506 likely to be accepted, since they should not affect the support for more
   1507 modern targets.
   1508 
   1509    <p>For some systems, old versions of GNU binutils may also be useful,
   1510 and are available from <samp><span class="file">pub/binutils/old-releases</span></samp> on
   1511 <a href="http://sourceware.org/mirrors.html">sourceware.org mirror sites</a>.
   1512 
   1513    <p>Some of the information on specific systems above relates to
   1514 such older systems, but much of the information
   1515 about GCC on such systems (which may no longer be applicable to
   1516 current GCC) is to be found in the GCC texinfo manual.
   1517 
   1518    <p><hr /><a name="elf"></a>
   1519 
   1520 <h3 class="heading"><a name="TOC84"></a>all ELF targets (SVR4, Solaris 2, etc.)</h3>
   1521 
   1522 <p>C++ support is significantly better on ELF targets if you use the
   1523 <a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of
   1524 inlines, vtables and template instantiations will be discarded
   1525 automatically.
   1526 
   1527    <p><hr />
   1528 <p><a href="./index.html">Return to the GCC Installation page</a>
   1529 
   1530 <!-- ***Old documentation****************************************************** -->
   1531 <!-- ***GFDL******************************************************************** -->
   1532 <!-- *************************************************************************** -->
   1533 <!-- Part 6 The End of the Document -->
   1534 </body></html>
   1535 
   1536