Chapter 13 : Compile and Install GCC - Compiling a Cross-Toolchain

 Hi,

In this chapter, we are going to discuss on how to compile the GCC which GNU Compiler Collection and cross tool chain.

Note :

- Please check the version of the package when you compile and install, at the time of writing the package was at version 10.2.0

- You should be logged in as lfs user, when you perform the actions described here.

- Change directory to the sources folder (/mnt/lfs/sources)

- Please check http://linuxfromscratch.org/lfs/view/stable/chapter05/gcc-pass1.html for more details.

Package Name	Version
gcc	10.2.0
mpfr	4.1.0
gmp	6.2.0
mpc	1.1.0

Change Directory to sources folder

$ cd $LFS/sources

Extract the gcc-10.2.0.tar.xz file in source folder

$ tar -xvf gcc-10.2.0.tar.xz

The above command would result in the creation of a new directory in /mnt/lfs/sources/ folder called gcc-10.2.0

Change directory to gcc-10.2.0

$ cd gcc-10.2.0

As you can see from the list of packages given above, the other packages has to be extracted inside gcc-10.2.0 folder, to extract those packages use the commands given below...

$ tar -xf ../mpfr-4.1.0.tar.xz

$ mv -v mpfr-4.1.0 mpfr

$ tar -xf ../gmp-6.2.0.tar.xz

$ mv -v gmp-6.2.0 gmp

$ tar -xf ../mpc-1.1.0.tar.gz

$ mv -v mpc-1.1.0 mpc

On x86_64 hosts, set the default directory name for 64-bit libraries to “lib”

case $(uname -m) in

  x86_64)

    sed -e '/m64=/s/lib64/lib/' \

        -i.orig gcc/config/i386/t-linux64

 ;;

esac

As suggested, the build process has to happen in a dedicated directory, hence creating a directory called build in gcc-10.2.0 folder.

$ mkdir build

$ cd build

Preparing GCC for compilation...

../configure                            \

    --target=$LFS_TGT          \

    --prefix=$LFS/tools           \

    --with-glibc-version=2.11  \

    --with-sysroot=$LFS          \

    --with-newlib                      \

    --without-headers                \

    --enable-initfini-array          \

    --disable-nls                         \

    --disable-shared                   \

    --disable-multilib                 \

    --disable-decimal-float        \

    --disable-threads                  \

    --disable-libatomic              \

    --disable-libgomp                \

    --disable-libquadmath         \

    --disable-libssp                    \

    --disable-libvtv                    \

    --disable-libstdcxx               \

    --enable-languages=c,c++

Compiling GCC

$ make -j4

Installing GCC

$ make install

Create a full version of the internal header using a command that is identical to what the GCC build system does in normal circumstances

$ cd ..

$ mkdir -p ./install-tools/include

$ touch ./install-tools/include/limits.h

$ cat gcc/limitx.h gcc/glimits.h gcc/limity.h > `dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/install-tools/include/limits.h

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