[PATCH] D20886: [libcxxabi] Allow target flags to affect configuration tests.

[Eric Fiselier via cfe-commits]

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

This patch changes the libc++abi CMake so that it adds certain target flags like  '-m32' or '--gcc-toolchain' before including `config-ix.cmake`.
Since these flags can affect things like `check_library_exists([...])` they needed to be added before the tests are performed.

Additionally this patch adds `LIBCXXABI_BUILD_32_BITS` which defaults to `LLVM_BUILD_32_BITS`.

This patch fixes:

https://llvm.org/bugs/show_bug.cgi?id=27950
https://llvm.org/bugs/show_bug.cgi?id=27959

http://reviews.llvm.org/D20886

Files:
  CMakeLists.txt
  test/CMakeLists.txt
  test/lit.site.cfg.in

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