__builtin_add_overflow  229 maint/gnulib/lib/glob.c   return __builtin_add_overflow (a, b, r);
__builtin_add_overflow  233 maint/gnulib/lib/intprops.h # define _GL_HAS_BUILTIN_ADD_OVERFLOW __has_builtin (__builtin_add_overflow)
__builtin_add_overflow  391 maint/gnulib/lib/intprops.h # define INT_ADD_WRAPV(a, b, r) __builtin_add_overflow (a, b, r)