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Not going to happen for 2.70 but should definitely be considered for 2.71.
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.
(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)
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