Teach the compiler-rt custom compilation and linking CMake rules used

for sanitizers to pass the C++ compilation and exe linking flags through
from the host CMake configuration. We pass the target flags afterward,
allowing them to trump flags as needed. This is particularly important
when the flags direct Clang, even the just-built-Clang, toward the
standard library, linker, and other tools to use.

llvm-svn: 208896

compiler-rt/cmake/Modules/AddCompilerRT.cmake

@@ -14,7 +14,7 @@ macro(add_compiler_rt_object_library name arch)
     parse_arguments(LIB "SOURCES;CFLAGS;DEFS" "" ${ARGN})
     add_library(${name}.${arch} OBJECT ${LIB_SOURCES})
     set_target_compile_flags(${name}.${arch}
-      ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
+      ${CMAKE_CXX_FLAGS} ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
     set_property(TARGET ${name}.${arch} APPEND PROPERTY
       COMPILE_DEFINITIONS ${LIB_DEFS})
   else()
@@ -136,6 +136,8 @@ macro(add_compiler_rt_test test_suite test_name)
   if(NOT COMPILER_RT_STANDALONE_BUILD)
     list(APPEND TEST_DEPS clang)
   endif()
+  set(TEST_LINK_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${TEST_LINK_FLAGS}")
+  separate_arguments(TEST_LINK_FLAGS)
   add_custom_target(${test_name}
     # MSVS CL doesn't allow a space between -Fe and the output file name.
     COMMAND ${COMPILER_RT_TEST_COMPILER} ${TEST_OBJECTS}