Re: AC_C_NORETURN macro?

[Paul Eggert]

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).