Re: [patch] Extend AC_PROG_CXX to check for standards conformance

[Roger Leigh]

On Tue, Jan 22, 2013 at 08:07:01PM +0000, Roger Leigh wrote:
> On Mon, Jan 21, 2013 at 10:38:15PM -0800, Paul Eggert wrote:
> > On 01/21/2013 12:36 PM, Roger Leigh wrote:
> > > For C stuff like
> > > const/restrict/volatile/inline, it's possible to achieve this
> > > fairly simply, and autoconf does a very good job here.
> > > 
> > > However, if you look at the C++11 features like declspec,
> > > automatic type inference, array initialisers, delegate
> > > constructors, range-based for loops, lambdas, etc. these
> > > features can not be substituted for.
> > 
> > On 01/21/2013 04:01 PM, Miles Bader wrote:
> > > If you need C++11 features and don't have any compatibility fallbacks,
> > > isn't following the autoconf language test in configure.ac by
> > > "if not c++11 then AC_ERROR([BARF! Need a C++11 compiler!])"  good
> > > enough?
> 
> That would probably satisfy my own particular use case sufficiently.
> 
> Please find attached a reworked and simplified patch.  This patch
> adds no user-visible macros, and removes the TR1 checks which can
> be done simply enough by the user.  This means it will check for
> only C++11 and C++98.  We have the specific ac_cv_prog_cxx_cxx11
> and ac_cv_prog_cxx_cxx98 which are both set to no if unavailable,
> exactly like for C, and these can be checked to see if the
> compiler satisfies your requirements.
> 
> Hope that's all OK with you.

If there's anything here you're unhappy with, I'll be happy to
make any needed changes.


Thanks,
Roger

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