Linux From Scratch - Version 7.8-systemd

Chapter 5. Constructing a Temporary System

5.8. Libstdc++-5.2.0

Libstdc++ is the standard C++ library. It is needed for the correct operation of the g++ compiler.

Approximate build time: 0.5 SBU
Required disk space: 850 MB

5.8.1. Installation of Target Libstdc++

[Note]

Note

Libstdc++ is part of the GCC sources. You should first unpack the GCC tarball and change to the gcc-5.2.0 directory.

Create a directory for Libstdc++ and enter it: 

mkdir -v ../gcc-build
cd ../gcc-build

Prepare Libstdc++ for compilation: 

../gcc-5.2.0/libstdc++-v3/configure \
    --host=$LFS_TGT                 \
    --prefix=/tools                 \
    --disable-multilib              \
    --disable-nls                   \
    --disable-libstdcxx-threads     \
    --disable-libstdcxx-pch         \
    --with-gxx-include-dir=/tools/$LFS_TGT/include/c++/5.2.0

The meaning of the configure options:

--host=...

Indicates to use the cross compiler we have just built instead of the one in /usr/bin.

--disable-libstdcxx-threads

Since we have not yet built the C threads library, the C++ one cannot be built either.

--disable-libstdcxx-pch

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

--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/5.2.0

This is the location where the standard include files are searched by the C++ compiler. In a normal build, this information is automatically passed to the Libstdc++ configure options from the toplevel directory. In our case, this information must be explicitly given.

Compile libstdc++ by running: 

make

Install the library: 

make install

Details on this package are located in Section 6.17.2, “Contents of GCC.”