[asan] Pass -fms-compatibility-version=19 with VS 2015

This resolves errors about char16_t and char32_t when compiling 2015 STL
headers with clang.

llvm-svn: 263973

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

@@ -60,6 +60,11 @@ endif()
 if(MSVC)
   # Disable exceptions on Windows until they work reliably.
   list(APPEND ASAN_UNITTEST_COMMON_CFLAGS -fno-exceptions -DGTEST_HAS_SEH=0)
+  # Extract the major version from CMake's MSVC_VERSION variable and pass it to
+  # -fms-compatibility-version. The major version controls the most important
+  # parts of clang's compatibility.
+  string(SUBSTRING "${MSVC_VERSION}" 0 2 MSVC_MAJOR_VERSION)
+  list(APPEND ASAN_UNITTEST_COMMON_CFLAGS "-fms-compatibility-version=${MSVC_MAJOR_VERSION}")
 endif()
 
 set(ASAN_BLACKLIST_FILE "${CMAKE_CURRENT_SOURCE_DIR}/asan_test.ignore")

compiler-rt/test/asan/CMakeLists.txt

@@ -29,6 +29,13 @@ if(APPLE)
   darwin_filter_host_archs(ASAN_SUPPORTED_ARCH ASAN_TEST_ARCH)
 endif()
 
+# Extract the major version from CMake's MSVC_VERSION variable and pass it into
+# the lit configuration.
+set(MSVC_MAJOR_VERSION "")
+if (MSVC)
+  string(SUBSTRING "${MSVC_VERSION}" 0 2 MSVC_MAJOR_VERSION)
+endif()
+
 foreach(arch ${ASAN_TEST_ARCH})
   if(ANDROID)
     set(ASAN_TEST_TARGET_ARCH ${arch}-android)

compiler-rt/test/asan/lit.cfg

@@ -64,9 +64,13 @@ else:
 if config.android:
   extra_linkflags += ["-lm"]
 
+msvc_major_version = get_required_attr(config, "msvc_major_version")
+
 # Setup default compiler flags used with -fsanitize=address option.
 # FIXME: Review the set of required flags and check if it can be reduced.
 target_cflags = [get_required_attr(config, "target_cflags")] + extra_linkflags
+if msvc_major_version:
+  target_cflags.append("-fms-compatibility-version=" + msvc_major_version)
 target_cxxflags = config.cxx_mode_flags + target_cflags
 clang_asan_static_cflags = (["-fsanitize=address",
                             "-mno-omit-leaf-frame-pointer",
@@ -110,6 +114,7 @@ if platform.system() == 'Windows':
   clang_cl_asan_cxxflags = ["-fsanitize=address",
                             "-Wno-deprecated-declarations",
                             "-WX",
+                            "-fms-compatibility-version=" + msvc_major_version,
                             "-D_HAS_EXCEPTIONS=0",
                             "-Zi"] + target_cflags
   if config.asan_dynamic:

compiler-rt/test/asan/lit.site.cfg.in

@@ -5,6 +5,7 @@
 config.name_suffix = "@ASAN_TEST_CONFIG_SUFFIX@"
 config.asan_lit_source_dir = "@ASAN_LIT_SOURCE_DIR@"
 config.target_cflags = "@ASAN_TEST_TARGET_CFLAGS@"
+config.msvc_major_version = "@MSVC_MAJOR_VERSION@"
 config.clang = "@ASAN_TEST_TARGET_CC@"
 config.bits = "@ASAN_TEST_BITS@"
 config.android = "@ANDROID@"