C99 DR #316 implies that the function parameter types that are known
only from a function definition (that does not have a prototype) are
only used to determine the compatible with other declarations of that
same function. In particular, when referencing the function we pretend
as if it does not have a prototype. Implement this behavior, which
fixes PR3626.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65460 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/knr-def-call.c b/test/Sema/knr-def-call.c
new file mode 100644
index 0000000..706f214
--- /dev/null
+++ b/test/Sema/knr-def-call.c
@@ -0,0 +1,14 @@
+// RUN: clang -fsyntax-only -verify %s
+
+// C DR #316, PR 3626.
+void f0(a, b, c, d) int a,b,c,d; {}
+void t0(void) { f0(1); }
+
+void f1(a, b) int a, b; {}
+void t1(void) { f1(1, 2, 3); }
+
+void f2(float); // expected-note{{previous declaration is here}}
+void f2(x) float x; { } // expected-error{{conflicting types for 'f2'}}
+
+typedef void (*f3)(void);
+f3 t3(int b) { return b? f0 : f1; } // okay