[PATCH] D20889: [libunwind] Allow target flags to affect CMake configuration tests

[Eric Fiselier via cfe-commits]

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

This patch changes the libunwind 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 LIBUNWIND_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/D20889

Files:
  CMakeLists.txt
  src/CMakeLists.txt

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