Re: Selecting a C++ standard

[Florian Weimer]

* Roger Leigh:

> I would propose to add:
>
> AC_PROG_CXX_STDCXX
> AC_PROG_CXX_CXX98
> AC_PROG_CXX_CXXTR1 [CXX98 with additional checks for TR1 headers]
> AC_PROG_CXX_CXX11
>
> With behaviour the same as the existing C macros.

This would be unwise because picking the most recent
compiler-supported standard will likely break programs on GNU/Linux.
Switching from C++98 to C++11 changes the ABI of standard library
templates, so it's basically an all-or-nothing choice for the entire
system.  (Other language changes can break compilation, but these are
less obnoxious and easier to work around.)