Don't warn for undefined but used decls that are external because of a typedef.

This fixes pr14736. It is fairly ugly, but I don't think we can do much better
as we have to wait at least until the end of the typedef to know if the
function will have external linkage or not.

llvm-svn: 171240

2 files changed, 21 insertions, 0 deletions

diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index 4b82069a624..0c5e8db1aa8 100644
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -394,6 +394,9 @@ static void checkUndefinedInternals(Sema &S) {
     // Ignore attributes that have become invalid.
     if (decl->isInvalidDecl()) continue;
 
+    // If we found out that the decl is external, don't warn.
+    if (decl->getLinkage() == ExternalLinkage) continue;
+
     // __attribute__((weakref)) is basically a definition.
     if (decl->hasAttr<WeakRefAttr>()) continue;
 
diff --git a/clang/test/SemaCXX/undefined-internal.cpp b/clang/test/SemaCXX/undefined-internal.cpp
index 154172001e7..e8ee4c1e907 100644
--- a/clang/test/SemaCXX/undefined-internal.cpp
+++ b/clang/test/SemaCXX/undefined-internal.cpp
@@ -181,3 +181,21 @@ namespace OverloadUse {
   template<void x(int)> void t(long*) { x(10); } // expected-note {{used here}}
   void g() { long a; t<f>(&a); }
 }
+
+namespace test7 {
+  typedef struct {
+    void bar();
+    void foo() {
+      bar();
+    }
+  } A;
+}
+
+namespace test8 {
+  typedef struct {
+    void bar(); // expected-warning {{function 'test8::<anonymous struct>::bar' has internal linkage but is not defined}}
+    void foo() {
+      bar(); // expected-note {{used here}}
+    }
+  } *A;
+}