[PATCH] [compiler-rt] Fix the CMake build when setting MACOSX_DEPLOYMENT_TARGET

[Hans Wennborg]

Hi samsonov,

If we don't reset CMAKE_OSX_DEPLOYMENT_TARGET, it will end up in
CFLAGS together with the -mmacosx-version-min that we set,
and the compiler errors about the conflict.

http://reviews.llvm.org/D4873

Files:
  CMakeLists.txt

Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -291,6 +291,7 @@
   else()
     set(SANITIZER_MIN_OSX_VERSION 10.6)
   endif()
+  set(CMAKE_OSX_DEPLOYMENT_TARGET "") # We're setting the flag manually below.
   set(DARWIN_osx_CFLAGS -mmacosx-version-min=${SANITIZER_MIN_OSX_VERSION})
   set(DARWIN_iossim_CFLAGS 
     -mios-simulator-version-min=7.0 -isysroot ${IOSSIM_SDK_DIR})
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