[3be4d97] | 1 | <sect1 id="ch-system-gcc" xreflabel="GCC">
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[793c2f7] | 2 | <title>Installing GCC-&gcc-version;</title>
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[576e206] | 3 | <?dbhtml filename="gcc.html" dir="chapter06"?>
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[6370fa6] | 4 |
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[5888299] | 5 | <para>The GCC package contains the GNU compiler collection, among them
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| 6 | the C and C++ compilers.</para>
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| 7 |
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[69276a94] | 8 | <screen>&buildtime; &gcc-time;
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| 9 | &diskspace; &gcc-compsize;</screen>
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[3554fa3a] | 10 |
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[5888299] | 11 | <literallayout>Official download location for GCC (&gcc-version;):
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| 12 | <ulink url="ftp://ftp.gnu.org/pub/gnu/gcc/"/>
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[4248b0e] | 13 | And for the patch:
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[5888299] | 14 | <ulink url="&patches-root;&gcc-nofixincludes-patch;"/></literallayout>
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| 15 |
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[d0dfce4] | 16 | &aa-gcc-dep;
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[73aedd1d] | 17 |
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| 18 | <sect2><title> </title><para> </para></sect2>
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| 19 |
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| 20 | <sect2>
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| 21 | <title>Installation of GCC</title>
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| 22 |
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| 23 | <para>This package is known to behave badly when you have changed its
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| 24 | default optimization flags (including the -march and -mcpu options).
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| 25 | Therefore, if you have defined any environment variables that override
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| 26 | default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting
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| 27 | or modifying them when building GCC.</para>
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| 28 |
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[37dcf2a] | 29 | <para>Unpack the GCC-core <emphasis>and</emphasis> the GCC-g++ tarball -- they
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[73aedd1d] | 30 | will unfold into the same directory. You should likewise extract the
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| 31 | GCC-testsuite package. The full GCC package contains even more
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| 32 | compilers. Instructions for building these can be found at
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| 33 | <ulink url="&blfs-root;view/stable/general/gcc.html"/>.</para>
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| 34 |
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[4248b0e] | 35 | <para>First apply only the No-Fixincludes patch (and <emphasis>not</emphasis>
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| 36 | the Specs patch) also used in the previous chapter:</para>
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[37dcf2a] | 37 |
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| 38 | <screen><userinput>patch -Np1 -i ../&gcc-nofixincludes-patch;</userinput></screen>
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| 39 |
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| 40 | <para>Now apply a sed substitution that will suppress the installation of
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| 41 | <filename>libiberty.a</filename>. We want to use the version of
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| 42 | <filename>libiberty.a</filename> provided by Binutils:</para>
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| 43 |
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| 44 | <screen><userinput>sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in</userinput></screen>
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[73aedd1d] | 45 |
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| 46 | <para>The GCC documentation recommends building GCC outside of the source
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| 47 | directory in a dedicated build directory:</para>
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| 48 |
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| 49 | <screen><userinput>mkdir ../gcc-build
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| 50 | cd ../gcc-build</userinput></screen>
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| 51 |
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| 52 | <para>Now prepare GCC for compilation:</para>
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| 53 |
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[d962702] | 54 | <screen><userinput>../&gcc-dir;/configure --prefix=/usr \
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[73aedd1d] | 55 | --enable-shared --enable-threads=posix \
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| 56 | --enable-__cxa_atexit --enable-clocale=gnu \
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| 57 | --enable-languages=c,c++</userinput></screen>
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| 58 |
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| 59 | <para>Compile the package:</para>
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| 60 |
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| 61 | <screen><userinput>make</userinput></screen>
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| 62 |
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[90afe40d] | 63 | <important><para>The test suite for GCC in this section is considered
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| 64 | <emphasis>critical</emphasis>. Our advice is to not skip it under any
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| 65 | circumstance.</para></important>
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| 66 |
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[73aedd1d] | 67 | <para>Test the results, but don't stop at errors (you'll remember the few
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| 68 | known ones):</para>
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| 69 |
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| 70 | <screen><userinput>make -k check</userinput></screen>
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| 71 |
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[3be4d97] | 72 | <para>The test suite notes from <xref linkend="ch-tools-gcc-pass2"/> are still very
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[73aedd1d] | 73 | much appropriate here. Be sure to refer back there should you have any
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| 74 | doubts.</para>
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| 75 |
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| 76 | <para>And install the package:</para>
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| 77 |
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| 78 | <screen><userinput>make install</userinput></screen>
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| 79 |
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| 80 | <para>Some packages expect the C PreProcessor to be installed in the
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| 81 | <filename>/lib</filename> directory.
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| 82 | To honor those packages, create this symlink:</para>
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| 83 |
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| 84 | <screen><userinput>ln -s ../usr/bin/cpp /lib</userinput></screen>
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| 85 |
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[90e3cb3] | 86 | <para>Many packages use the name <command>cc</command> to call the C
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[73aedd1d] | 87 | compiler. To satisfy those packages, create a symlink:</para>
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| 88 |
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| 89 | <screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen>
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| 90 |
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| 91 | <note><para>At this point it is strongly recommended to repeat the sanity check
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| 92 | we performed earlier in this chapter. Refer back to
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[a0b689e] | 93 | <xref linkend="ch-system-readjusting"/> and repeat the check. If the results
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[73aedd1d] | 94 | are wrong, then most likely you erroneously applied the GCC Specs patch from
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[dcff046] | 95 | <xref linkend="chapter-temporary-tools"/>.</para></note>
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[73aedd1d] | 96 |
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| 97 | </sect2>
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[6370fa6] | 98 |
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[5888299] | 99 | &aa-gcc-shortdesc;
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| 100 | &aa-gcc-desc;
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| 101 |
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[6370fa6] | 102 | </sect1>
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| 103 |
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