6.4. GCC-4.2.4

6.4.1. Installation of GCC

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

Now we will change cpp's search path so it won't look in /usr/include:

cp -v gcc/cppdefault.c{,.orig}
sed -e '/#define STANDARD_INCLUDE_DIR/s@"/usr/include"@0@g' \
    gcc/cppdefault.c.orig > gcc/cppdefault.c

Also, we need to set the directory searched by the fixincludes process for system headers, so it won't look at the host's headers:

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

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

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

Before starting to build GCC, remember to unset any environment variables that override the default optimization flags.

Prepare GCC for compilation:

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

Compile the package:

make AS_FOR_TARGET="${AS}" \
    LD_FOR_TARGET="${LD}"

Install the package:

make install