Looks terrible, go ahead. =)
================
Comment at: lib/Sema/SemaExpr.cpp:878-879
@@ -877,3 +877,4 @@
// emitted along with format string checking in Sema::CheckFunctionCall().
- if (isValidVarArgType(E->getType()) == VAK_Undefined) {
+ if (isValidVarArgType(E->getType()) == VAK_Undefined &&
+ !LangOpts.MSVCCompat) {
// Turn this into a trap.
----------------
Maybe this should be a separate `VAK_` value, `VAK_ValidInMSVC` or similar?
http://reviews.llvm.org/D5492
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