Details on this package are located in Section 10.10.2, “Contents of GCC.”
The GCC package contains the GNU compiler collection, which includes the C and C++ compilers.
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-pure64_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
When searching for the multilibs, force the build to use the
results of --print-multi-lib
from our
cross-compiler, not the native compiler gcc builds now:
cp -v gcc/Makefile.in{,.orig2} sed -e "/MULTILIBS/s@\$(GCC_FOR_TARGET)@/cross-tools/bin/${CC}@g" \ gcc/Makefile.in.orig2 > gcc/Makefile.in
The GCC documentation recommends building GCC outside of the source directory in a dedicated build directory:
mkdir -v ../gcc-build cd ../gcc-build
Before starting to build GCC, remember to unset any environment variables that override the default optimization flags.
Prepare GCC for compilation:
CC="${CC} ${BUILD64}" CXX="${CXX} ${BUILD64}" \ ../gcc-4.2.4/configure --prefix=/tools --disable-multilib \ --build=${CLFS_HOST} --host=${CLFS_TARGET} --target=${CLFS_TARGET} \ --libexecdir=/tools/lib --with-local-prefix=/tools --enable-long-long \ --enable-c99 --enable-shared --enable-threads=posix --disable-nls \ --enable-__cxa_atexit --enable-languages=c,c++ --disable-libstdcxx-pch
The meaning of the new configure options:
CXX="${CXX}
${BUILD64}"
This forces the C++ compiler to use our 64 Bit flags.
--disable-libstdcxx-pch
Do not build the pre-compiled header (PCH) for libstdc++
. It takes up a lot of space, and
we have no use for it.
Compile the package:
make AS_FOR_TARGET="${AS}" \ LD_FOR_TARGET="${LD}"
Install the package:
make install
Now we copy the files that are placed in /tools/lib64
to /tools/lib
. We also delete the /tools/lib64
directory:
cp -va /tools/lib64/* /tools/lib rm -rvf /tools/lib64
Details on this package are located in Section 10.10.2, “Contents of GCC.”