Re: GCC support for C++ noexcept

[Edward Diener <eldlistmailingz at tropicsoft dot com>]

On 7/27/2015 10:36 AM, Jeffrey Walton wrote:
> On Mon, Jul 27, 2015 at 9:48 AM, Edward Diener
> <eldlistmailingz@tropicsoft.com> wrote:
> > On 7/27/2015 4:34 AM, Jonathan Wakely wrote:
> > > On 27 July 2015 at 05:17, Edward Diener wrote:
> > > > Try
> > > >
> > > > #if defined(__GXX_EXPERIMENTAL_CXX0X__) || (__cplusplus >= 201103L)
> > > > // C++11 is in effect
> > > > #endif
> > >
> > > GCC 4.8 defines __cplusplus to the correct YYYYMMDD value so this is
> > > not necessary.
> >
> > I meant it as a general solution for any version of gcc. It is what Boost
> > config uses.
>
> __GXX_EXPERIMENTAL_CXX0X breaks on Apple platforms and some Clang
> based gear. Been there, done that....

I do say "I meant it as a general solution for any version of gcc."

Boost detects clang, and any other gcc derivative, separately from gcc, 
so the code I presented has nothing to do with clang, since it is in a 
header file where the compiler is known to be gcc. I agree that if you 
could be compiling for clang or another gcc derivative compiler the code 
I presented may not by itself be enough if that compiler either defined 
__GXX_EXPERIMENTAL_CXX0X__ when C++11 support is not implemented or if 
that compiler has some other specific way of indicating C++11 support.

if __GXX_EXPERIMENTAL_CXX0X is defined on Apple platforms for gcc when 
C++11 is not supported I would definitely like to know more about that 
scenario.