[clang] [CIR] Call to variadic functions (PR #141942)

[Sirui Mu via cfe-commits]

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@@ -409,6 +409,18 @@ void CIRGenFunction::emitCallArg(CallArgList &args, const clang::Expr *e,
   args.add(emitAnyExprToTemp(e), argType);
 }
 
+QualType CIRGenFunction::getVarArgType(const Expr *arg) {
+  // System headers on Windows define NULL to 0 instead of 0LL on Win64. MSVC
+  // implicitly widens null pointer constants that are arguments to varargs
+  // functions to pointer-sized ints.
+  if (!getTarget().getTriple().isOSWindows())
+    return arg->getType();
+
+  assert(!cir::MissingFeatures::msabi());
+  cgm.errorNYI(arg->getSourceRange(), "getVarArgType: NYI for Windows target");
+  return {};
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Lancern wrote:

Updated.

https://github.com/llvm/llvm-project/pull/141942