Default to using the Unicode version of Win32 APIs instead of the ANSI version. This helps to catch instances where a developer accidentally forgets to explicitly specify which version of the API to use and accidentally winds up failing to support non-ASCII characters properly.

llvm-svn: 273599

cmake/modules/HandleLLVMOptions.cmake

@@ -249,6 +249,12 @@ if( MSVC )
     -D_SCL_SECURE_NO_WARNINGS
     )
 
+  # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI.
+  add_llvm_definitions(
+    -DUNICODE
+    -D_UNICODE
+  )
+
   set(msvc_warning_flags
     # Disabled warnings.
     -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline)