_GL_HAS_BUILTIN_ADD_OVERFLOW  247 maint/gnulib/lib/intprops.h # define _GL_HAS_BUILTIN_MUL_OVERFLOW _GL_HAS_BUILTIN_ADD_OVERFLOW
_GL_HAS_BUILTIN_ADD_OVERFLOW  390 maint/gnulib/lib/intprops.h #if _GL_HAS_BUILTIN_ADD_OVERFLOW