http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51860
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-16 13:21:09 UTC --- The second patch bootstrapped with CC='gcc -m31' CXX='g++ -m31' s390 ../configure --enable-languages=c,c++,fortran --with-mode=esa Running make check now.