Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -4837,10 +4837,12 @@
 def _SLASH_w : CLIgnoredJoined<"w">;
 def _SLASH_Zc___cplusplus : CLIgnoredFlag<"Zc:__cplusplus">;
 def _SLASH_Zc_auto : CLIgnoredFlag<"Zc:auto">;
+def _SLASH_Zc_externConstexpr : CLIgnoredFlag<"Zc:externConstexpr">;
 def _SLASH_Zc_forScope : CLIgnoredFlag<"Zc:forScope">;
 def _SLASH_Zc_inline : CLIgnoredFlag<"Zc:inline">;
 def _SLASH_Zc_rvalueCast : CLIgnoredFlag<"Zc:rvalueCast">;
 def _SLASH_Zc_ternary : CLIgnoredFlag<"Zc:ternary">;
+def _SLASH_Zc_throwingNew : CLIgnoredFlag<"Zc:throwingNew">;
 def _SLASH_Zc_wchar_t : CLIgnoredFlag<"Zc:wchar_t">;
 def _SLASH_ZH_MD5 : CLIgnoredFlag<"ZH:MD5">;
 def _SLASH_ZH_SHA1 : CLIgnoredFlag<"ZH:SHA1">;
Index: clang/test/Driver/cl-options.c
===================================================================
--- clang/test/Driver/cl-options.c
+++ clang/test/Driver/cl-options.c
@@ -369,10 +369,12 @@
 // RUN:    /wd1234 \
 // RUN:    /Zc:__cplusplus \
 // RUN:    /Zc:auto \
+// RUN:    /Zc:externConstexpr \
 // RUN:    /Zc:forScope \
 // RUN:    /Zc:inline \
 // RUN:    /Zc:rvalueCast \
 // RUN:    /Zc:ternary \
+// RUN:    /Zc:throwingNew \
 // RUN:    /Zc:wchar_t \
 // RUN:    /ZH:MD5 \
 // RUN:    /ZH:SHA1 \