Follow-up Comment #2, sr #110532 (project autoconf):
MPFR is written in C, and it is generally compiled with a C compiler, so that
we expect the compiler to be given by $CC. This means that we need AC_LANG(C),
not AC_LANG(C++).
But we also allow C++ compilers (some compilers seem to support only
Follow-up Comment #1, sr #110532 (project autoconf):
This (and the matching set of changes to AC_LANG_CALL(C++)) is in fact the
main thing I was thinking of when I wrote in the 2.70 release notes that
"setting CC to a C++ compiler is no longer supported."
That said, I'm not rejecting your patch
Follow-up Comment #2, sr #110530 (project autoconf):
1. We currently don't support *any* use of -Werror or -Werror=whatever in
configure scripts. There are lots and lots of places where autoconf's test
programs trigger warnings, especially with newer compilers. We *want* to fix
all of those
