[PATCH] [libcxx] Add logic to probe compiler in tests.

[Eric Fiselier]

Hi mclow.lists, danalbert, jroelofs,

This patch probes the cxx compiler used during testing by getting it to dump its predefined macros. Based on the value of these macros the compiler name and compiler name + version are added to the available features.

There are three compiler names:
- `clang`
- `apple-clang`
- `gcc`.

The available features added are equivalent to:
- `'%s' % compiler_name`
- `'%s-%s.%s' % compiler_name, major_version, minor_version`

This information can be used to XFAIL tests on different compilers / versions.

http://reviews.llvm.org/D6399

Files:
  test/lit.cfg
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D6399.16594.patch
Type: text/x-patch
Size: 2389 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20141125/8290aa52/attachment.bin>