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

[Rich E]

Hi all,

I am enabling libc++ in a library that was depending on boost for things
such as mutex, thread, shared_ptr, etc., and I have not yet found a way to
detect that we are compiling with the libc++ library unless I first include
a header from it.  I can do this:

// framework config.h:

#include <vector>

#if defined( _LIBCPP_VERSION )
    #define USING_LIBCPP
#endif

but now every file that wanted to know if we are using libc++ has vector in
it. This include is used to determine which standard library we should use,
and many things depend on it. Is there a better solution, other than a -D
flag to clang?

Cheers,
Rich
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