Set CMP0054 policy

Change-Id: I308471a2104f7fdd2815723d4b61f294ee427076

cpp/CMakeLists.txt

@@ -36,6 +36,12 @@ else()
   include(GNUInstallDirs)
 endif()
 
+# Compatibility with CMake 3.1
+if(POLICY CMP0054)
+  # http://www.cmake.org/cmake/help/v3.1/policy/CMP0054.html
+  cmake_policy(SET CMP0054 NEW)
+endif()
+
 set(ARROW_SO_VERSION "0")
 set(ARROW_ABI_VERSION "${ARROW_SO_VERSION}.0.0")
 

cpp/cmake_modules/SetupCxxFlags.cmake

@@ -30,7 +30,7 @@ if (MSVC)
   # insecure, like std::getenv
   add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 
-  if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  if ("\"${CMAKE_CXX_COMPILER_ID}\"" STREQUAL "Clang")
     # clang-cl
     set(CXX_COMMON_FLAGS "-EHsc")
   elseif(${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 19)