Downgrade complaints about calling unavailable functions to a warning

(as GCC does), except when we've performed overload resolution and
found an unavailable function: in this case, we actually error.

Merge the checking of unavailable functions with the checking for
deprecated functions. This unifies a bit of code, and makes sure that
we're checking for unavailable functions in the right places. Also,
this check can cause an error. We may, eventually, want an option to
make "unavailable" warnings into errors.

Implement much of the logic needed for C++0x deleted functions, which
are effectively the same as "unavailable" functions (but always cause
an error when referenced). However, we don't have the syntax to
specify deleted functions yet :)

llvm-svn: 64955

1 files changed, 11 insertions, 2 deletions

diff --git a/clang/test/SemaCXX/attr-unavailable.cpp b/clang/test/SemaCXX/attr-unavailable.cpp
index 140008a4cba..78e348ae1f6 100644
--- a/clang/test/SemaCXX/attr-unavailable.cpp
+++ b/clang/test/SemaCXX/attr-unavailable.cpp
@@ -2,10 +2,19 @@
 
 int &foo(int);
 double &foo(double);
-void foo(...) __attribute__((__unavailable__)); // expected-note{{unavailable function is declared here}}
+void foo(...) __attribute__((__unavailable__)); // expected-note {{candidate function}} \
+// expected-note{{function has been explicitly marked unavailable here}}
+
+void bar(...) __attribute__((__unavailable__)); // expected-note 2{{explicitly marked unavailable}}
 
 void test_foo(short* sp) {
   int &ir = foo(1);
   double &dr = foo(1.0);
-  foo(sp); // expected-error{{call to function 'foo' that has been intentionally made unavailable}}
+  foo(sp); // expected-error{{call to unavailable function 'foo'}}
+
+  void (*fp)(...) = &bar; // expected-warning{{'bar' is unavailable}}
+  void (*fp2)(...) = bar; // expected-warning{{'bar' is unavailable}}
+
+  int &(*fp3)(int) = foo;
+  void (*fp4)(...) = foo; // expected-warning{{'foo' is unavailable}}
 }