7.7. Libstdc++ from GCC-10.2.0, Pass 2

When building gcc-pass2 we had to defer the installation of the C++ standard library because no suitable compiler was available to compile it. We could not use the compiler built in that section because it is a native compiler and should not be used outside of chroot and risks polluting the libraries with some host components.

Approximate build time: 0.8 SBU
Required disk space: 1.1 GB

7.7.1. Installation of Target Libstdc++



Libstdc++ is part of the GCC sources. You should first unpack the GCC tarball and change to the gcc-10.2.0 directory.

Create a link which exists when building libstdc++ in the gcc tree:

ln -s gthr-posix.h libgcc/gthr-default.h

Create a separate build directory for libstdc++ and enter it:

mkdir -v build
cd       build

Prepare libstdc++ for compilation:

../libstdc++-v3/configure            \
    CXXFLAGS="-g -O2 -D_GNU_SOURCE"  \
    --prefix=/usr                    \
    --disable-multilib               \
    --disable-nls                    \
    --host=$(uname -m)-lfs-linux-gnu \

The meaning of the configure options:


These flags are passed by the top level Makefile when doing a full build of GCC.

--host=$(uname -m)-lfs-linux-gnu

We have to mimic what would happen if this package were built as part of a full compiler build. This switch would be passed to configure by GCC's build machinery.


This switch prevents the installation of precompiled include files, which are not needed at this stage.

Compile libstdc++ by running:


Install the library:

make install

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