https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67496
--- Comment #5 from Vittorio Zecca <zeccav at gmail dot com> --- Yes, I did test your patch, but nothing changed. I understand you tried to generate a sanitized version of f951 but the process failed. I did the following (approximately): CFLAGS="-fsanitize=undefined -Og -ggdb -fno-omit-frame-pointer -L/home/vitti/local/gcc-6.1.0/lib64" CXXFLAGS="-fsanitize=undefined -Og -ggdb -fno-omit-frame-pointer" LDFLAGS="-L/home/vitti/local/gcc-6.1.0/lib64 -lubsan -ldl -lpthread" ../gcc-6.1.0/configure --prefix=/home/vitti/local/gcc-6.1.0-undefined --disable-multilib --enable-languages=c,c++,fortran --disable-libstdcxx --disable-bootstrap make and cross fingers With an analogous approach I got a -fsanitize=address version of gcc/g++/gfortran
