Outdated libtool creates trouble on macOS

[FX Coudert]

OK, final patch. This was the most painful, because I hate autoconf quoting, way too many brackets and parentheses. But the patch silences the remaining warnings about AC_TRY_COMPILE, AC_TRY_LINK, and AC_TRY_RUN. And it is verified to be a no-op in terms of the generated configure file (except the one comment changed on purpose, and one extraneous newline character removed).

Hopefully this makes gmp future-proof for at least 10 years in terms of autoconf/automake :)

The remaining warnings are:

> glibtoolize: Consider adding 'AC_CONFIG_MACRO_DIRS([m4])' to configure.ac,
> glibtoolize: and rerunning glibtoolize and aclocal.
> glibtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am.

which is perfectly safe to ignore (it’s just advice). And this:

> configure.ac:4045: warning: AC_PROG_LEX without either yywrap or noyywrap is obsolete
> ./lib/autoconf/programs.m4:716: _AC_PROG_LEX is expanded from...
> ./lib/autoconf/programs.m4:709: AC_PROG_LEX is expanded from...
> aclocal.m4:9472: AM_PROG_LEX is expanded from...
> configure.ac:4045: the top level

which is also safe to ignore. I tried to silence it, but did not find a way: AM_PROG_LEX does not accept an extra argument, and switching from AM_PROG_LEX to AC_PROG_LEX would introduce a functional change. I’m not sure if the change would risk breaking some platforms for gmp with exotic flex implementations, so I did not want to risk it. I have filed the issue with automake, asking for their opinion on what I think is a automake / autoconf feature mismatch.

Cheers,
FX


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