[PATCH] D23926: [libcxx] Don't use C99 math ops in -std=c++03 mode

[Asiri Rathnayake via cfe-commits]

rmaprath updated this revision to Diff 69962.
rmaprath added a comment.

Simplified the patch a little bit more.

Now, library vendors should be able to define `_LIBCPP_STRICT_C99_COMPATIBILITY` and `libc++` will not use/test C99 math functions in `C++03/98` modes. Currently it's only the math functions, we can extend this approach to other affected areas if the approach is OK. Not 100% sure about the namings, can change them as needed.

@EricWF: Gentle ping.


https://reviews.llvm.org/D23926

Files:
  include/__config
  include/math.h
  test/std/depr/depr.c.headers/math_h.pass.cpp
  test/std/numerics/c.math/cmath.pass.cpp
  test/std/numerics/complex.number/cmplx.over/proj.pass.cpp

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