6.18. GCC-12.2.0 - Pass 2

The GCC package contains the GNU compiler collection, which includes the C and C++ compilers.

Approximate build time: 15 SBU
Required disk space: 4.5 GB

6.18.1. Installation of GCC

As in the first build of GCC, the GMP, MPFR, and MPC packages are required. Unpack the tarballs and move them into the required directory names:

tar -xf ../mpfr-4.1.0.tar.xz
mv -v mpfr-4.1.0 mpfr
tar -xf ../gmp-6.2.1.tar.xz
mv -v gmp-6.2.1 gmp
tar -xf ../mpc-1.2.1.tar.gz
mv -v mpc-1.2.1 mpc

If building on x86_64, change the default directory name for 64-bit libraries to lib:

case $(uname -m) in
    sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64

Override the building rule of libgcc and libstdc++ headers, to allow building these libraries with POSIX threads support:

sed '/thread_header =/s/@.*@/gthr-posix.h/' \
    -i libgcc/Makefile.in libstdc++-v3/include/Makefile.in

Create a separate build directory again:

mkdir -v build
cd       build

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

Now prepare GCC for compilation:

../configure                                       \
    --build=$(../config.guess)                     \
    --host=$LFS_TGT                                \
    --target=$LFS_TGT                              \
    LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc      \
    --prefix=/usr                                  \
    --with-build-sysroot=$LFS                      \
    --enable-initfini-array                        \
    --disable-nls                                  \
    --disable-multilib                             \
    --disable-decimal-float                        \
    --disable-libatomic                            \
    --disable-libgomp                              \
    --disable-libquadmath                          \
    --disable-libssp                               \
    --disable-libvtv                               \

The meaning of the new configure options:


Normally, using --host ensures that a cross-compiler is used for building GCC, and that compiler knows that it has to look for headers and libraries in $LFS. But the build system of GCC uses other tools, which are not aware of this location. This switch is needed to have them find the needed files in $LFS, and not on the host.


As we are cross-compiling GCC, it's impossible to build target libraries (libgcc and libstdc++) with the compiled GCC binaries because these binaries won't run on the host distro. GCC building system will attempt to use the C and C++ compilers on the host distro as a workaround by default. It's not supported to build GCC target libraries with a different version of GCC, so using host compilers may cause building failure. This parameter ensures to build the libraries with GCC pass 1 and prevent the issue.


Allow libstdc++ to use shared libgcc being built in this pass, instead of the static version built in GCC pass 1. This is needed for supporting C++ exception handling.


This option is automatically enabled when building a native compiler with a native compiler on x86. But here, we build with a cross compiler, so we need to explicitly set this option.

Compile the package:


Install the package:

make DESTDIR=$LFS install

As a finishing touch, create a utility symlink. Many programs and scripts run cc instead of gcc, which is used to keep programs generic and therefore usable on all kinds of UNIX systems where the GNU C compiler is not always installed. Running cc leaves the system administrator free to decide which C compiler to install:

ln -sv gcc $LFS/usr/bin/cc

Details on this package are located in Section 8.26.2, “Contents of GCC.”