6.18. GCC-10.2.0 - Pass 2

#### Linux From Scratch - Version 10.1-rc1

### Chapter 6. Cross Compiling Temporary Tools

- Prev

  Binutils-2.36.1 - Pass 2

- Next

  Entering Chroot and Building Additional Temporary Tools

- Up
- Home

# 6.18. GCC-10.2.0 - Pass 2

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

Approximate build time: 11 SBU
Required disk space: 3.7 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
      x86_64)
        sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
      ;;
    esac

Create a separate build directory again:

    mkdir -v build
    cd       build

Create a symlink that allows libgcc to be built with posix threads support:

    mkdir -pv $LFS_TGT/libgcc
    ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h

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                                \
        --prefix=/usr                                  \
        CC_FOR_TARGET=$LFS_TGT-gcc                     \
        --with-build-sysroot=$LFS                      \
        --enable-initfini-array                        \
        --disable-nls                                  \
        --disable-multilib                             \
        --disable-decimal-float                        \
        --disable-libatomic                            \
        --disable-libgomp                              \
        --disable-libquadmath                          \
        --disable-libssp                               \
        --disable-libvtv                               \
        --disable-libstdcxx                            \
        --enable-languages=c,c++

The meaning of the new configure options:

`-with-build-sysroot=$LFS`

  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.

`--enable-initfini-array`

  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:

    make

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.”

- Prev

  Binutils-2.36.1 - Pass 2

- Next

  Entering Chroot and Building Additional Temporary Tools

- Up
- Home