On 05/09/13 08:24, Zack Weinberg wrote: > (That said, I've never been clear myself on why CFLAGS and CPPFLAGS > *are* separate, except possibly the now-long-obsolete historical > reason that some traditional preprocessors didn't accept arbitrary > compiler options.) I think that's basically it, yes. It used to be that some compilers didn't have an -E option, so that one had to invoke the preprocessors directly, and they rejected options like -O2. Nowadays I expect this problem is no longer relevant. _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf