My experience with this in Gnulib is that <stdnoreturn.h> is dubious due to its problems with MSVC. But perhaps Autoconf could #define _Noreturn in <config.h>, for compilers that do not already support it. Gnulib already does this, but in a way that is not Autoconfish, and it might make sense to try to do it in a more Autoconfish way. However, I don't know how this would address the problem of library headers using _Noreturn that are intended to be used by other compilers (which I recall is why Gnulib does it in the strange way that it does). _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf