lfs-book/chapter05/gcc-exp.xml

<sect2>
<title>Command explanations</title>

<para><userinput>--prefix=/static:</userinput> This is NOT a typo. GCC hard
codes some paths while compiling and so we need to pass /static as the
prefix during ./configure. We pass the real install prefix during the
make install command later.</para>

<para><userinput>--with-as and --with-ld:</userinput> GCC can be
miscompiled if your host distribution's Binutils package is quite old. We
need a good working static GCC until we reinstall GCC later in chapter 6.
So by using <filename>as</filename> and <filename>ld</filename> from the
Binutils package we just compiled we ensure that GCC will work
correctly.</para>

<para><userinput>make BOOT_LDFLAGS="-static":</userinput>
This is the equivalent to make LDFLAGS="-static" as we use with other
packages to compile them statically.</para>

<para><userinput>make install-no-fixedincludes:</userinput>
This prevents the fixed header files from being installed. This is needed
because under normal circumstances the GCC installation will run the
fixincludes scripts which scans your system for header files that need to be
fixed. Say it finds Glibc header files. It will fix them and will end up in
$LFS/static/lib/gcc-lib/i686-pc-linux-gnu/ Later on in chapter 6 you
will install Glibc which will install header files in /usr/include. Next
you will install other programs which will use Glibc headers. GCC will look
in /static/lib/gcc-lib before looking in /usr/include, which has the result
of Glibc header files from your host distribution being found and used which
are probably incompatible with the Glibc version actually in use on the LFS
system.</para>

<para><userinput>ln -s gcc $LFS/static/bin/cc:</userinput> This
creates the $LFS/static/bin/gcc symlink, which some packages need.</para>

</sect2>