RunClang: Detect -std=c++17 from --castxml-cc-msvc

Updates to VS 2015 and VS 2017 added support for `-std:` flags
specifying the language standard level for MSVC.  The level is reported
in the `_MSVC_LANG` preprocessor definition instead of `__cplusplus`.
Detect MSVC standard C++ level from `_MSVC_LANG`.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/cc-msvc.c b/test/cc-msvc.c
index 10afc63..45feff8 100644
--- a/test/cc-msvc.c
+++ b/test/cc-msvc.c
@@ -5,12 +5,15 @@ int main(int argc, const char* argv[])
 {
   int cpp = 0;
   const char* msc_ver = "1600";
+  const char* msvc_lang = 0;
   int i;
   for (i = 1; i < argc; ++i) {
     if (strncmp(argv[i], "--cc-define=", 12) == 0) {
       fprintf(stdout, "\n#define %s 1", argv[i]+12);
     } else if (strncmp(argv[i], "-msc=", 5) == 0) {
       msc_ver = argv[i]+5;
+    } else if (strncmp(argv[i], "-msvc_lang=", 8) == 0) {
+      msvc_lang = argv[i]+11;
     } else if (strstr(argv[i], ".cpp")) {
       cpp = 1;
     }
@@ -26,6 +29,11 @@ int main(int argc, const char* argv[])
   fprintf(stdout,
     "#define _MSC_VER %s\n", msc_ver
     );
+  if(msvc_lang) {
+    fprintf(stdout,
+      "#define _MSVC_LANG %s\n", msvc_lang
+      );
+  }
   fprintf(stdout,
     "#define __has_include(x) x\n"
     "#define __has_include_next(x) x\n"