[cfe-dev] Best way to detect libc++ at compile time?

[Richard Smith]

On Sat, Jul 21, 2012 at 1:56 PM, Joe Groff <arcata at gmail.com> wrote:

> On Sat, Jul 21, 2012 at 1:46 PM, Rich E <reakinator at gmail.com> wrote:
> > I was doing this for a while, but I decided it was cluttering up the
> > includes section since you also need a check for __clang__
>
> You can do something like this so you don't need to guard every single
> use of __has_include:
>
> #if !__clang__
> #define __has_include(x) 0
> #endif


The recommended approach is

#ifndef __has_include
#define __has_include(x) 0
#endif

This would work correctly both in the presence of versions of clang which
do not support __has_include, and for other compilers which do, but which
don't claim to be clang.
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