[sr #110394] Support optional use of the C++ compiler in AC_PROG_CXX (and similarly for other languages)

URL:
  <https://savannah.gnu.org/support/?110394>

                 Summary: Support optional use of the C++ compiler in
AC_PROG_CXX (and similarly for other languages)
                 Project: Autoconf
            Submitted by: zackw
            Submitted on: Sun 06 Dec 2020 10:25:57 PM UTC
                Category: None
                Priority: 5 - Normal
                Severity: 1 - Wish
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

Bug #110294 reports a regression in autoconf 2.70 on the configure script for
a program that has some C and some C++ code, but use of the C++ code is
optional.  The code that broke attempts to do most of what AC_PROG_CXX does,
but *not* abort the configure script when a C++ compiler is not found. 
Instead, output variables would be set so that compilation of C++ code is
disabled.

We do not want to support this particular kludge, as it would pin down the
guts of AC_PROG_CXX too much, but we _should_ support optional use of the
$LANG compiler (for all values of $LANG).  Perhaps with an additional argument
to AC_PROG_CC, AC_PROG_CXX, etc, marking usage optional.

See also bug #110286.




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