[PATCH] D13796: [libcxx] Use "-stdlib=libc++" when possible instead of '-nodefaultlibs' in the test suite.

[Eric Fiselier via cfe-commits]

EricWF created this revision.
EricWF added reviewers: mclow.lists, danalbert, jroelofs.
EricWF added a subscriber: cfe-commits.

Currently we use '-nodefaultlibs' when building and running the libc++ tests. However we should prefer using '-stdlib=libc++'.
This patch automatically detects when the test suite can use "-stdlib=libc++" and prefers it when possible.

We use `-stdlib=libc++` when the following are true:

1. `CXX` is clang or apple clang.
2. 'cxx_abi' is set to 'none'. This means that libc++ handles the ABI library dependency on its own.
3. We are using the default unwinder (ie not libunwind).


http://reviews.llvm.org/D13796

Files:
  test/libcxx/compiler.py
  test/libcxx/test/config.py

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