GCC-11.2.0

The patches are similar to GCC-11.2.0 - Pass 2. Replace lib64:

patch -Np0 -i ../_sources/patches/obsolete/0001-pure64-for-x86-64.patch

Apply a patch to reflect the qLinux conventions:

patch -Np1 -i ../_sources/patches/config-gcc.patch

This patch does the following changes:

• fix the location of the musl dynamic loader
• change the default (native) include directory to  /qlnx/inc 
• change the location where gcc searches for crt*.o (start)files

Install the c++ header files from libstdc++-v3 in  /qlnx/inc :

patch -Np1 -i ../_sources/patches/gcc-libstdc++-headers-install.patch

Configure gcc:

../configure --prefix=/qlnx \
             --enable-languages=c,c++ \
             --enable-bootstrap \
             --disable-multilib \
             --disable-libsanitizer \
             --libexecdir=/qlnx/bin/libexec \
             --includedir=/qlnx/inc \
             --datarootdir=/qlnx/dat \
             --localedir=/qlnx/dat/locale \
             --mandir=/qlnx/man \
             --infodir=/tmp \
             --with-system-zlib \
             --with-pkgversion=qLinux

–enable-bootstrap
    Build a native compiler.

–disable-libsanitizer
    Musl doesn't support libsanitizer yet (requires the non-existent <fstab.h> from glibc).

–datarootdir=/qlnx/dat
    The datarootdir have to be defined explicitly, otherwise the directory name share will be used (e.g. for locale data).

Libgomp and may be other libs require to have a  sh  in the path

Compile gcc:

make

Install it:

make install

Remove an obsolete directory:

rm -rf /linux/lib/gcc/$(gcc -dumpmachine)/11.2.0/include-fixed/bits/

Remove python bindings (optional):

rm -rf /linux/dat/gcc-11.2.0

Add a compatibility symlink to enable building programs with Link Time Optimization (LTO):

ln -sfv ../../linux/bin/lib/gcc/$(gcc -dumpmachine)/11.2.0/liblto_plugin.so /linux/lib/bfd-plugins/

Now it's recommendd to verify it works:

echo 'int main(){}' > dummy.c
cc dummy.c -v -Wl,--verbose &> dummy.log
readelf -l a.out | grep ': /lib'

Do the other tests described in the book. : Not all tests are possible.

Optional: Delete the now obsolete folders  /qlnx/bin/libexec/gcc/x86_64-linux-musl  and  /qlnx/lib/gcc/x86_64-linux-musl .

To get the gcc work was a period over more than 5 weeks overall!