Details on this package are located in Section 8.26.2, “Contents of GCC.”
Libstdc++ is the standard C++ library. It is needed to compile C++ code (part of GCC is written in C++), but we had to defer its installation when we built gcc-pass1 because it depends on glibc, which was not yet available in the target directory.
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 separate build directory for libstdc++ and enter it:
mkdir -v build cd build
Prepare libstdc++ for compilation:
../libstdc++-v3/configure \ --host=$LFS_TGT \ --build=$(../config.guess) \ --prefix=/usr \ --disable-multilib \ --disable-nls \ --disable-libstdcxx-pch \ --with-gxx-include-dir=/tools/$LFS_TGT/include/c++/10.2.0
The meaning of the configure options:
--host=...
Specifies the use the cross compiler we have just built
instead of the one in /usr/bin
.
--disable-libstdcxx-pch
This switch prevents the installation of precompiled include files, which are not needed at this stage.
--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/10.2.0
This is the location where the C++ compiler should search for the standard include files. In a normal build, this information is automatically passed to the libstdc++ configure options from the top level directory. In our case, this information must be explicitly given.
Compile libstdc++ by running:
make
Install the library:
make DESTDIR=$LFS install
Details on this package are located in Section 8.26.2, “Contents of GCC.”