[cfe-dev] [libcxx] RFC: C++14 and beyond
hhinnant at apple.com
Tue May 7 11:37:11 PDT 2013
So I'm thinking along these lines in <__config>, below where platforms customize things:
# if 1 // -std=c++98/03/11
# define _LIBCPP_STD_VER 11
# elif 0 // -std=c++1y/14
# define _LIBCPP_STD_VER 13 // current year, or date of std ratification
# elif 0 // -std=c++17
#endif // _LIBCPP_STD_VER
I can't make this work today because I can't tell the difference between -std=c++98/03/11 and -std=c++1y/14.
If the client (or platform) desires, they can #define _LIBCPP_STD_VER and to whatever they want and <__config> will respect their definition.
libcxx implementors can:
#if _LIBCPP_STD_VER > 11
// implement a post C++11 feature
The clang driver could be taught how to set _LIBCPP_STD_VER.
Thoughts? Help on telling the difference between -std=c++98/03/11 and -std=c++1y/14?
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