llvm7 build fails with gcc-4.8 when linking libomp:

/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:614:
error: undefined reference to '__atomic_fetch_add_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:496:
error: undefined reference to '__atomic_load_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:496:
error: undefined reference to '__atomic_load_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:496:
error: undefined reference to '__atomic_load_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:496:
error: undefined reference to '__atomic_load_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:474:
error: undefined reference to '__atomic_store_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:474:
error: undefined reference to '__atomic_store_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:474:
error: undefined reference to '__atomic_store_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:577:
error: undefined reference to '__atomic_compare_exchange_8'
/usr/lib/gcc/i586-suse-linux/4.8/../../../../include/c++/4.8/bits/atomic_base.h:474:
error: undefined reference to '__atomic_store_8'
clang-7: error: linker command failed with exit code 1 (use -v to see
invocation)