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[feature request] Selection of C++ compiler conformance level

From: Roger Leigh
Subject: [feature request] Selection of C++ compiler conformance level
Date: Sun, 8 May 2011 18:01:36 +0100
User-agent: Mutt/1.5.20 (2009-06-14)


For C compilers, we have several macros to select the minimum
standard version of the compiler (AC_PROG_CC_C89, AC_PROG_CC_C99
and AC_PROG_CC_STDC to select the most recent standard, and fall
back to an older standard if unavailable).

With C++0x forthcoming, it would be equally useful to have
corresponding macros to select the minimum C++ standard required.
I'd like to use C++0x features in my code, and hence I do need to
ensure that I'm using a compiler in C++0x mode to build.

Thus, these macros would be very useful (for example)

AC_PROG_CXX_STDCXX (latest version with fallback to most recent
  available otherwise)

AC_PROG_CXX_CXX0X would add the appropriate compiler options
to $CXX, e.g. -std=gnu++0x for GCC.

This could be modelled entirely on the existing _AC_C_STD_TRY
(add _AC_CXX_STD_TRY), with the appropriate testcases to test
for basic C++0x conformance as we do for basic C99 conformance.


  .''`.  Roger Leigh
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