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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2490 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
83 lines
3.5 KiB
XML
83 lines
3.5 KiB
XML
<sect2><title> </title><para> </para></sect2>
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<sect2>
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<title>Installation of GCC</title>
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<para>This package is known to behave badly when you have changed its
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default optimization flags (including the -march and -mcpu options).
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Therefore, if you have defined any environment variables that override
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default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting
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or modifying them when building GCC.</para>
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<para>We will be building the C and C++ compilers at this time, so you'll
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need to unpack both the gcc-core and gcc-g++ tarballs. Other compilers are
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available in the full gcc package; instructions for building them may be
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found at <ulink url="&blfs-root;view/cvs/general/gcc.html"/>.</para>
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<para><screen><userinput>patch -Np1 -i ../gcc-&gcc-version;-no_fixedincludes.patch
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patch -Np1 -i ../gcc-&gcc-version;-mmap_test.patch</userinput></screen></para>
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<para>It is recommended by the GCC installation documentation to build GCC
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in a dedicated directory outside of the source tree. Create the build
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directory:</para>
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<para><screen><userinput>mkdir ../gcc-build &&
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cd ../gcc-build</userinput></screen></para>
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<para>Prepare GCC to be compiled:</para>
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<para><screen><userinput>CFLAGS="-O2 -pipe" CXXFLAGS="-O2 -pipe" \
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../gcc-&gcc-version;/configure --prefix=/usr \
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--enable-shared --enable-threads=posix \
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--enable-__cxa_atexit --enable-clocale=gnu \
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--enable-version-specific-runtime-libs \
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--mandir=/usr/share/man \
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--infodir=/usr/share/info</userinput></screen></para>
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<para>The meanings of the configure options are:</para>
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<itemizedlist>
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<listitem><para><userinput>--enable-threads=posix</userinput>: This enables
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C++ exception handling for multi-threaded code.</para></listitem>
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<listitem><para><userinput>--enable-__cxa_atexit</userinput>: This option
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will result in C++ shared libraries and C++ programs that are interoperable
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with other Linux distributions.</para></listitem>
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<listitem><para><userinput>--enable-clocale=gnu</userinput>: There is a risk
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that some people will build ABI incompatible C++ libraries if they didn't
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install all of the glibc localedata. Using --enable-clocale=gnu ensures that
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the "right thing" is done in all cases. If you don't wish to use this option,
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then at least build the <emphasis>de_DE</emphasis> locale. When GCC finds
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this specific locale, then the correct locale mode (<emphasis>gnu</emphasis>)
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is implemented.</para></listitem>
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</itemizedlist>
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<para>Continue with compiling the package:</para>
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<para><screen><userinput>make BOOT_LDFLAGS="-s" BOOT_CFLAGS="-O2 -pipe" \
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STAGE1_CFLAGS="-pipe" bootstrap</userinput></screen></para>
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<para><screen><userinput>make -k check</userinput></screen></para>
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<para>Finish installing the package:</para>
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<para><screen><userinput>make install</userinput></screen></para>
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<para>Some packages expect the C PreProcessor to be installed in the
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<filename>/lib</filename> and <filename>/usr/lib</filename> directories.
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To honor those packages, create two symlinks:</para>
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<para><screen><userinput>ln -s ../usr/bin/cpp /lib &&
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ln -s ../bin/cpp /usr/lib</userinput></screen></para>
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<para>Many packages compile using <emphasis>cc</emphasis> as the name for
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the C compiler. To satisfy those packages, create a <emphasis>cc</emphasis>
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symlink:</para>
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<para><screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen></para>
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<para><screen><userinput>rm /usr/lib/libiberty.a</userinput></screen></para>
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</sect2>
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