5.11. Cross GCC-4.2.4 - Final

5.11.1. Installation of GCC Cross Compiler

The following patch enables fixes compilation errors with the kernel:

patch -Np1 -i ../gcc-4.2.4-PR31490-1.patch

Make a couple of essential adjustments to the specs file to ensure GCC uses our build environment:

patch -Np1 -i ../gcc-4.2.4-specs-1.patch

To make sure that a couple of tools use the proper syntax, apply the following patch:

patch -Np1 -i ../gcc-4.2.4-posix-1.patch

The following patch ensures that gcc does not search the /usr directory for libgcc_s.so when cross-compiling:

patch -Np1 -i ../gcc-4.2.4-cross_search_paths-1.patch

Change the StartFile Spec to point to the correct library location:

echo "
#undef STARTFILE_PREFIX_SPEC
#define STARTFILE_PREFIX_SPEC \"/tools/lib/\"" >> gcc/config/linux.h

Now alter gcc's c preprocessor's default include search path to use /tools only:

cp -v gcc/Makefile.in{,.orig}
sed -e "s@\(^CROSS_SYSTEM_HEADER_DIR =\).*@\1 /tools/include@g" \
    gcc/Makefile.in.orig > gcc/Makefile.in

Finally, disable -B in configure so wrong architecture libraries are not picked up, as -B is not expanded by the multilib spec:

cp -v configure{,.orig}
sed -e  '/FLAGS_FOR_TARGET.*\/lib\//s@-B[^ ]*/lib/@@g' configure.orig > \
    configure

The GCC documentation recommends building GCC outside of the source directory in a dedicated build directory:

mkdir -v ../gcc-build
cd ../gcc-build

Prepare GCC for compilation:

../gcc-4.2.4/configure --prefix=/cross-tools \
    --target=${CLFS_TARGET} --host=${CLFS_HOST} \
    --with-local-prefix=/tools --disable-nls --enable-shared \
    --enable-languages=c,c++ --enable-__cxa_atexit \
    --enable-c99 --enable-long-long --enable-threads=posix

Continue with compiling the package:

make AS_FOR_TARGET="${CLFS_TARGET}-as" \
    LD_FOR_TARGET="${CLFS_TARGET}-ld"

Install the package:

make install