commit 706a8765417ce3c0c1511e1614c8c26f550bbc94
author Alex Stewart <alexs.mac@gmail.com> Tue Jan 19 20:48:33 2016 +0000
committer Alex Stewart <alexs.mac@gmail.com> Thu Jan 21 19:30:58 2016 +0000
tree fef5683b38a52e4c47bba1e27599e035c93376d2
parent cb467d83fe6ea8e082bfdf1f122b455c03f5eb56

Fix use of va_copy() if compiling with explicit C++ version < C++11.

- va_copy() was defined in the C99 standard, but did not appear in the
  C++ standard until C++11.  If the C++ standard is not specified,
  both GCC & Clang will define va_copy(), even though strictly speaking
  they should not.  However, if the C++ standard is explicitly specified
  to something < C++11 (e.g. -std=c++03) then va_copy() will NOT be
  defined.
- Now, if va_copy() is not defined, we either define our own version
  on non GCC/Clang compilers (as before for MSVC alone), and use the
  internal __va_copy() version on GCC & Clang, which does exist.

Change-Id: I0224f7fa6aae060dee2287782b1cad767c244d3c