https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64920
Vittorio Zecca <zeccav at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |zeccav at gmail dot com --- Comment #1 from Vittorio Zecca <zeccav at gmail dot com> --- I have the same messages during gcc 5.2.0 generation Fixing directory /usr/include into /home/vitti/gcc-5.2.0-sanitize-all/gcc/include-fixed ../../../gcc-5.2.0/libiberty/regex.c:6972:11: runtime error: left shift of negative value -1 ../../../gcc-5.2.0/libiberty/regex.c:7167:4: runtime error: left shift of negative value -1 Applying machine_name to slang.h I believe this is because at line 688 (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; (*((source) + 1)) is negateive (-1)