GCC compatibility: gcc allows applying va_args to const
va_lists for some reason. This fixes rdar://6726818
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68434 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 55eaaa4..a43c2c3 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -4724,7 +4724,10 @@
Expr *E = static_cast<Expr*>(expr.get());
UsualUnaryConversions(E);
- if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible)
+ AssignConvertType ConvResult =
+ CheckAssignmentConstraints(VaListType, E->getType());
+ if (ConvResult != Compatible &&
+ ConvResult != CompatiblePointerDiscardsQualifiers)
return ExprError(Diag(E->getLocStart(),
diag::err_first_argument_to_va_arg_not_of_type_va_list)
<< E->getType() << E->getSourceRange());
diff --git a/test/Sema/varargs.c b/test/Sema/varargs.c
index 434e4ce..7255f9f 100644
--- a/test/Sema/varargs.c
+++ b/test/Sema/varargs.c
@@ -60,3 +60,10 @@
int *x = &__builtin_va_arg(ap, int); // expected-error {{address expression must be an lvalue or a function designator}}
__builtin_va_end(ap);
}
+
+// rdar://6726818
+void f8() {
+ const __builtin_va_list args2;
+ (void)__builtin_va_arg(args2, int);
+}
+