[libcxx] Add support for sanitizers on OS X.

Summary: This patch adds special configuration logic to find the compiler_rt libraries required by sanitizers on OS X. The supported sanitizers are Address and Undefined.

Reviewers: mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D11381

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242858 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CMakeLists.txt

@@ -68,6 +68,32 @@ if (LIBCXX_COVERAGE_LIBRARY)
 endif()
 target_link_libraries(cxx ${libraries})
 
+if (APPLE AND LLVM_USE_SANITIZER)
+  if ("${LLVM_USE_SANITIZER}" STREQUAL "Address")
+    set(LIBFILE "libclang_rt.asan_osx_dynamic.dylib")
+  elseif("${LLVM_USE_SANITIZER}" STREQUAL "Undefined")
+    set(LIBFILE "libclang_rt.ubsan_osx_dynamic.dylib")
+  else()
+    message(WARNING "LLVM_USE_SANITIZER=${LLVM_USE_SANITIZER} is not supported on OS X")
+  endif()
+  if (LIBFILE)
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=lib OUTPUT_VARIABLE LIBDIR RESULT_VARIABLE Result)
+    if (NOT ${Result} EQUAL "0")
+      message(FATAL "Failed to find library resource directory")
+    endif()
+    string(STRIP "${LIBDIR}" LIBDIR)
+    set(LIBDIR "${LIBDIR}/darwin/")
+    if (NOT IS_DIRECTORY "${LIBDIR}")
+      message(FATAL_ERROR "Cannot find compiler-rt directory on OS X required for LLVM_USE_SANITIZER")
+    endif()
+    set(LIBCXX_SANITIZER_LIBRARY "${LIBDIR}/${LIBFILE}")
+    set(LIBCXX_SANITIZER_LIBRARY "${LIBCXX_SANITIZER_LIBRARY}" PARENT_SCOPE)
+    message(STATUS "Manually linking compiler-rt library: ${LIBCXX_SANITIZER_LIBRARY}")
+    target_link_libraries(cxx "${LIBCXX_SANITIZER_LIBRARY}")
+    target_link_libraries(cxx "-Wl,-rpath,${LIBDIR}")
+  endif()
+endif()
+
 
 # Setup flags.
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_FPIC_FLAG -fPIC)