[PATCH] [compiler-rt][builtins] CTest to execute builtins testsuite

[Faraz Shahbazker]

Hi samsonov, howard.hinnant,

There doesn't seem to be a defined procedure for running the builtins testsuite. There is a 'test' shell script in test/builtins/Unit but it seems to be outdated and specific to darwin with hard-coded paths.

Comments in test/CMakeLists.txt suggest that builtins and BlockRunTime testsuites have not yet been ported to lit framework. Attached is a rudimentary CTest setup to run the unit tests in builtins, as a stop-gap until the test
sources can be modified for lit.

The new target to trigger test run is `check-builtins'. It is intended to stop after building tests for cross-builds, else build and execute for native builds. Hope it is useful!

http://reviews.llvm.org/D4251

Files:
  test/CMakeLists.txt
  test/builtins/CMakeLists.txt
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