Implement DR1330 in C++11 mode, to support libstdc++4.7 which uses it.
We have a new flavor of exception specification, EST_Uninstantiated. A function
type with this exception specification carries a pointer to a FunctionDecl, and
the exception specification for that FunctionDecl is instantiated (if needed)
and used in the place of the function type's exception specification.
When a function template declaration with a non-trivial exception specification
is instantiated, the specialization's exception specification is set to this
new 'uninstantiated' kind rather than being instantiated immediately.
Expr::CanThrow has migrated onto Sema, so it can instantiate exception specs
on-demand. Also, any odr-use of a function triggers the instantiation of its
exception specification (the exception specification could be needed by IRGen).
In passing, fix two places where a DeclRefExpr was created but the corresponding
function was not actually marked odr-used. We used to get away with this, but
don't any more.
Also fix a bug where instantiating an exception specification which refers to
function parameters resulted in a crash. We still have the same bug in default
arguments, which I'll be looking into next.
This, plus a tiny patch to fix libstdc++'s common_type, is enough for clang to
parse (and, in very limited testing, support) all of libstdc++4.7's standard
headers.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154886 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaTemplate/instantiate-declref.cpp b/test/SemaTemplate/instantiate-declref.cpp
index ced56df..7d4a2ff 100644
--- a/test/SemaTemplate/instantiate-declref.cpp
+++ b/test/SemaTemplate/instantiate-declref.cpp
@@ -105,3 +105,13 @@
}
template void f(int const &); // expected-note {{requested here}}
}
+
+namespace test2 {
+ template<typename T> void f() {
+ T::error; // expected-error {{no member}}
+ }
+ void g() {
+ // This counts as an odr-use, so should trigger the instantiation of f<int>.
+ (void)&f<int>; // expected-note {{here}}
+ }
+}