[Sema] Add tests for weak functions

I found these checks to be missing, just add some simple cases.

Differential Revision: https://reviews.llvm.org/D47200

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@333283 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Sema/attr-weak.c b/test/Sema/attr-weak.c
index e3610caba5845331c2ed09363d7389333ae9172f..6f0c3d5523b3b7298e8ec07ae10c28eba5daea91 100644 (file)
--- a/test/Sema/attr-weak.c
+++ b/test/Sema/attr-weak.c
@@ -1,7 +1,9 @@
 // RUN: %clang_cc1 -verify -fsyntax-only %s
 
+extern int f0() __attribute__((weak));
 extern int g0 __attribute__((weak));
 extern int g1 __attribute__((weak_import));
+int f2() __attribute__((weak));
 int g2 __attribute__((weak));
 int g3 __attribute__((weak_import)); // expected-warning {{'weak_import' attribute cannot be specified on a definition}}
 int __attribute__((weak_import)) g4(void);
@@ -11,6 +13,7 @@ void __attribute__((weak_import)) g5(void) {
 struct __attribute__((weak)) s0 {}; // expected-warning {{'weak' attribute only applies to variables, functions, and classes}}
 struct __attribute__((weak_import)) s1 {}; // expected-warning {{'weak_import' attribute only applies to variables and functions}}
 
+static int f() __attribute__((weak)); // expected-error {{weak declaration cannot have internal linkage}}
 static int x __attribute__((weak)); // expected-error {{weak declaration cannot have internal linkage}}
 
 // rdar://9538608