[Sema] Allow C conversions in C overload logic

C allows for some implicit conversions that C++ does not, e.g. void* ->
char*. This patch teaches clang that these conversions are okay when
dealing with overloads in C.

Differential Revision: http://reviews.llvm.org/D13604

llvm-svn: 249995

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/test/Sema/overloadable.c b/clang/test/Sema/overloadable.c
index bdd471477b4..3120649dbc0 100644
--- a/clang/test/Sema/overloadable.c
+++ b/clang/test/Sema/overloadable.c
@@ -85,3 +85,17 @@ void local() {
 void after_local_1(int) __attribute__((overloadable)); // expected-error {{conflicting types}}
 void after_local_2(int); // expected-error {{must have the 'overloadable' attribute}}
 void after_local_3(int) __attribute__((overloadable));
+
+// Make sure we allow C-specific conversions in C.
+void conversions() {
+  void foo(char *c) __attribute__((overloadable));
+  void foo(char *c) __attribute__((overloadable, enable_if(c, "nope.jpg")));
+
+  void *ptr;
+  foo(ptr);
+
+  void multi_type(unsigned char *c) __attribute__((overloadable));
+  void multi_type(signed char *c) __attribute__((overloadable));
+  unsigned char *c;
+  multi_type(c);
+}