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5.8.1. Installation of Target Libstdc++


Note

Libstdc++ is part of the GCC sources. You should first unpack the GCC tarball and change to the gcc-9.

2.0 directory.

Note

Libstdc++ is part of the GCC sources. You should first unpack the GCC tarball and change to the gcc-9.

2.0 directory.

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


mkdir -v build cd build

mkdir -v build cd build

image

Prepare Libstdc++ for compilation:


../libstdc++-v3/configure

--host=$LFS_TGT

--prefix=/tools

--disable-multilib

--disable-nls

--disable-libstdcxx-threads

--disable-libstdcxx-pch

\

\

\

\

\

\

\

../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++/9.2.0

--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/9.2.0

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++/9.2.0

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 top level directory. In our case, this information must be explicitly given.

Compile libstdc++ by running:


make

make

Install the library:


make install

make install


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