_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 391 maint/gnulib/lib/intprops.h #if _GL_HAS_BUILTIN_ADD_OVERFLOW