lfs-book-zh_CN/chapter05/gcc-inst.xml

<sect2>
<title>Installation of GCC</title>

<para>This package is known to behave badly when you have changed its default
optimization flags (including the -march and -mcpu options). GCC is best
left alone, so we recommend you unsetting CFLAGS, CXXFLAGS and other
such variables/settings that would change the default optimization that
it comes with.</para>

<para>Install GCC by running the following commands:</para>

<para><screen><userinput>patch -Np1 -i ../gcc-&gcc-patch-version;.patch &amp;&amp;
mkdir ../gcc-build &amp;&amp;
cd ../gcc-build &amp;&amp;
../gcc-&gcc-version;/configure --prefix=/usr --enable-languages=c,c++ \
&nbsp;&nbsp;&nbsp;--disable-nls --disable-shared --enable-threads=posix &amp;&amp;
make BOOT_LDFLAGS=-static bootstrap &amp;&amp;
make prefix=$LFS/usr install &amp;&amp;
cd $LFS/lib &amp;&amp;
ln -sf ../usr/bin/cpp &amp;&amp;
cd $LFS/usr/lib &amp;&amp;
ln -sf ../bin/cpp &amp;&amp;
cd $LFS/usr/bin &amp;&amp;
ln -sf gcc cc &amp;&amp;
rmdir $LFS/usr/*-gnu/include &amp;&amp;
rmdir $LFS/usr/*-gnu</userinput></screen></para>

</sect2>