On Sat, Aug 07, 2021 at 04:02:45AM +0200, Ævar Arnfjörð Bjarmason wrote:

Perhaps I've missed some obvious reason not to do this, but why are we
parsing the --version output of two modern compilers, as opposed to just
asking them what type/version they are via their usual macro facilities?
I.e. something like the below:

That would probably work OK in practice, but it actually seems more
complex to me (how do other random compilers react to "-E -"? Is it
possible for us to get other output from the preprocessor that would
confuse an eval?).

It could perhaps make the Apple version-string confusion go away,
though, which might make it worth doing.

-Peff