[2ff1ab9] | 1 | <sect2><title> </title><para> </para></sect2>
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| 2 |
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[6370fa6] | 3 | <sect2>
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| 4 | <title>Installation of GCC</title>
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| 5 |
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[e69a59f] | 6 | <para>This package is known to behave badly when you have changed its
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| 7 | default optimization flags (including the -march and -mcpu options). GCC is
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[2c094d6] | 8 | best left alone. Therefore, if you have defined any environment variables
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[e69a59f] | 9 | that override default optimizations, such as CFLAGS and CXXFLAGS, we
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[4e010de] | 10 | recommend unsetting or modifying them when building GCC. You have
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[e69a59f] | 11 | been warned.</para>
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[b43aab1] | 12 |
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[2ff1ab9] | 13 | <para>We will be building the C and C++ compilers at this time, so you'll
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| 14 | need to unpack both the gcc-core and gcc-g++ tarballs. Other compilers are
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| 15 | available in the full gcc package; instructions for building them may be
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| 16 | found at <ulink url="&blfs-root;view/cvs/general/gcc.html"/>.</para>
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| 17 |
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| 18 | <para>It is recommended by the GCC installation documentation to build GCC
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| 19 | in a dedicated directory outside of the source tree. Create the build
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| 20 | directory:</para>
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[6370fa6] | 21 |
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[78867601] | 22 | <para><screen><userinput>mkdir ../gcc-build &&
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[2ff1ab9] | 23 | cd ../gcc-build</userinput></screen></para>
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| 24 |
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| 25 | <para>Prepare GCC to be compiled:</para>
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| 26 |
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| 27 | <para><screen><userinput>../gcc-&gcc-version;/configure --prefix=/usr --enable-shared \
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[4e010de] | 28 | --enable-threads=posix --with-slibdir=/lib \
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[2ff1ab9] | 29 | --enable-__cxa_atexit --enable-clocale=gnu</userinput></screen></para>
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| 30 |
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| 31 | <para>The meanings of the configure options are:</para>
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| 32 |
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| 33 | <itemizedlist>
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| 34 | <listitem><para><userinput>--enable-threads=posix:</userinput> This enables
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| 35 | C++ exception handling for multi-threaded code.</para></listitem>
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| 36 |
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| 37 | <listitem><para><userinput>--enable-__cxa_atexit:</userinput> This option
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| 38 | will result in C++ shared libraries and C++ programs that are interoperable
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| 39 | with other Linux distributions.</para></listitem>
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| 40 |
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| 41 | <listitem><para><userinput>--enable-clocale=gnu:</userinput> There is a risk
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| 42 | that some people will build ABI incompatible C++ libraries if they didn't
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| 43 | install all of the glibc localedata. Using --enable-clocale=gnu ensures that
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| 44 | the "right thing" is done in all cases. If you don't wish to use this option,
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| 45 | then at least build the <emphasis>de_DE</emphasis> locale. When GCC finds
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| 46 | this specific locale, then the correct locale mode (<emphasis>gnu</emphasis>)
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| 47 | is implemented.</para></listitem>
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| 48 | </itemizedlist>
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| 49 |
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| 50 | <para>Continue with compiling the package:</para>
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| 51 |
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| 52 | <para><screen><userinput>make bootstrap</userinput></screen></para>
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| 53 |
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| 54 | <para>The <emphasis>bootstrap</emphasis> target doesn't just compile GCC, but
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| 55 | it compiles GCC a multiple times. It uses the first compiled programs to
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| 56 | compile itself a second and third time to make sure the compiler was compiled
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| 57 | properly.</para>
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| 58 |
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| 59 | <para>Finish installing the package:</para>
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| 60 |
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| 61 | <para><screen><userinput>make install</userinput></screen></para>
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| 62 |
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| 63 | <para>Some packages require that the C++ compiler be installed in the
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| 64 | <filename>/lib</filename> and <filename>/usr/lib</filename> directories.
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| 65 | To honor those packages, create two symlinks:</para>
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| 66 |
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| 67 | <para><screen><userinput>ln -s ../usr/bin/cpp /lib &&
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| 68 | ln -s ../bin/cpp /usr/lib</userinput></screen></para>
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| 69 |
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| 70 | <para>Many packages compile using <emphasis>cc</emphasis> as the name for
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| 71 | the C compiler. To satisfy those packages, create a <emphasis>cc</emphasis>
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| 72 | symlink:</para>
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| 73 |
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| 74 | <para><screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen></para>
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[6370fa6] | 75 |
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| 76 | </sect2>
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