Feature request: AC_PROG_CXX_STDCXX

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I was going to report this to bug-autoconf, but it's more of a
feature request than a bug.

For C, we have AC_PROG_CC_STDC to select the most recent C standard,
falling back to the previous standard if not available, and the
macros AC_PROG_CC_C99 and AC_PROG_CC_C89 to request the use of a
specific standard.

With the introduction of several C++ standards, it is (I think) now
needed to have a similar arrangement for C++, to allow selection of
the minimum standard required by your code.  These could include:

AC_PROC_CXX_CXX11 and/or AC_PROC_CXX_CXX0X [not yet finalised]

AC_PROC_CXX_STDCXX could select the most recent version of the
standard supported.

I'm afraid that unlike AC_PROG_CC_C99, I won't have the time to write
this for the foreseeable future, so I thought I'd bring it up on the
list in case anyone else did.


  .''`.  Roger Leigh
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