1 files changed, 26 insertions, 0 deletions
diff --git a/Tests/RunCMake/CheckCompilerFlag/CheckCompilerFlagCXX.cmake b/Tests/RunCMake/CheckCompilerFlag/CheckCompilerFlagCXX.cmake
new file mode 100644
index 0000000..dec31ec
--- /dev/null
+++ b/Tests/RunCMake/CheckCompilerFlag/CheckCompilerFlagCXX.cmake
@@ -0,0 +1,26 @@
+
+enable_language (CXX)
+include(CheckCompilerFlag)
+
+set(CXX 1) # test that this is tolerated
+
+# test that the check uses an isolated locale
+set(_env_LC_ALL "${LC_ALL}")
+set(ENV{LC_ALL} "BAD")
+
+check_compiler_flag(CXX "-_this_is_not_a_flag_" SHOULD_FAIL)
+if(SHOULD_FAIL)
+  message(SEND_ERROR "invalid CXX compile flag didn't fail.")
+endif()
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|LCC|Clang" AND NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
+  check_compiler_flag(CXX "-x c++" SHOULD_WORK)
+  if(NOT SHOULD_WORK)
+    message(SEND_ERROR "${CMAKE_CXX_COMPILER_ID} compiler flag '-x c++' check failed")
+  endif()
+endif()
+
+if(NOT "$ENV{LC_ALL}" STREQUAL "BAD")
+  message(SEND_ERROR "ENV{LC_ALL} was not preserved by check_compiler_flag")
+endif()
+set(ENV{LC_ALL} ${_env_LC_ALL})