[asan] Stop appending -lm, -pthread and other linker options on Darwi…

…n for ASan unit tests

On Darwin, -lm, -pthread and others are implied. -pthread currently produces a warning (compiler option unused).

Differential Revision: https://reviews.llvm.org/D24698

llvm-svn: 282260

compiler-rt/lib/asan/tests/CMakeLists.txt

@@ -106,12 +106,13 @@ set(ASAN_UNITTEST_INSTRUMENTED_LIBS)
 append_list_if(ANDROID atomic ASAN_UNITTEST_INSTRUMENTED_LIBS)
 
 set(ASAN_UNITTEST_NOINST_LINKFLAGS ${ASAN_UNITTEST_COMMON_LINKFLAGS})
-append_list_if(COMPILER_RT_HAS_LIBM -lm ASAN_UNITTEST_NOINST_LINKFLAGS)
-append_list_if(COMPILER_RT_HAS_LIBDL -ldl ASAN_UNITTEST_NOINST_LINKFLAGS)
-append_list_if(COMPILER_RT_HAS_LIBRT -lrt ASAN_UNITTEST_NOINST_LINKFLAGS)
-append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread ASAN_UNITTEST_NOINST_LINKFLAGS)
-append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread
-          ASAN_DYNAMIC_UNITTEST_INSTRUMENTED_LINKFLAGS)
+if(NOT APPLE)
+  append_list_if(COMPILER_RT_HAS_LIBM -lm ASAN_UNITTEST_NOINST_LINKFLAGS)
+  append_list_if(COMPILER_RT_HAS_LIBDL -ldl ASAN_UNITTEST_NOINST_LINKFLAGS)
+  append_list_if(COMPILER_RT_HAS_LIBRT -lrt ASAN_UNITTEST_NOINST_LINKFLAGS)
+  append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread ASAN_UNITTEST_NOINST_LINKFLAGS)
+  append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread ASAN_DYNAMIC_UNITTEST_INSTRUMENTED_LINKFLAGS)
+endif()
 
 # TODO(eugenis): move all -l flags above to _LIBS?
 set(ASAN_UNITTEST_NOINST_LIBS)