We are supposed to handle compiling on a "C90 plus long long"
compiler, so make gcc (our most common development platform compiler)
complain when we don't.
However, suppress the complaints about the Microsoft definitions of
the <inttypes.h> strings.
From master branch checkin 25da6eaf434705a6ad01f252132dc7f109493c67,
except that -Wwrite-strings is omitted; making the code base
-Wwrite-strings clean is going to take additional work.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
OpenWatcom 1.8 has a C99 mode, which implements _Bool and
<stdbool.h>. Unfortunately the implementation is broken, and doesn't
let _Bool be implicitly converted to integer (as required by the C99
spec). Detect this case in autoconf.
We can actually test for the options being accepted, rather than try
to test for gcc; this handles differences between gcc versions as well
as compilers with a similar command line set.
