[PATCH] [libcxx] Update the way the -std= flag is chosen by CMake and LibcxxTestFormat

[Albert Wong]

>>! In D4329#22, @ajwong wrote:
>>>! In D4329#19, @rnk wrote:
>>>>! In D4329#18, @mclow.lists wrote:
>>> I'm fine with dropping the ability to build libc++ with a C++03 compiler.
>>> [ I'm *not* fine with dropping the ability to use libc++ from c++03 code ]
>>> 
>>> Responsible opposing viewpoints... ?
>> 
>> Albert, is the Android NDK version of GCC new enough?
> 
> NDK has both gcc-4.6 and gcc-4.8.  I think we only expect libc++ to work with gcc-4.8 so we're probably okay. Let me verify with Andrew Hseih, head of android NDK. He's in Taiwan though so it'll be a few hours before he responds.

Verified that we're only supporting gcc >= 4.8. Android NDK should be fine. :)

http://reviews.llvm.org/D4329