rsmith added a comment.
Just a couple of minor things, otherwise this looks good to me.
================
Comment at: lib/Sema/SemaDecl.cpp:5568
@@ -5570,1 +5567,3 @@
+ return FD->isExternC();
else if (auto *VD = dyn_cast<VarDecl>(D))
+ return VD->isExternC();
----------------
Drop the `else` here.
================
Comment at: test/CodeGen/redefine_extname.c:29
@@ +28,3 @@
+#pragma redefine_extname foo_static bar_static
+static int foo_static() { return 1; } // expected-warning {{#pragma
redefine_extname is applicable to external C declarations only; not applied to
function 'foo_static'}}
+int baz() { return foo_static(); }
----------------
This `expected-warning` does nothing, because you don't have a `-verify` RUN:
line. This part of the test should be in test/Sema/something.
================
Comment at: test/CodeGenCXX/redefine_extname.cpp:34
@@ +33,3 @@
+#pragma redefine_extname foo_cpp bar_cpp
+extern int foo_cpp() { return 1; } // expected-warning {{#pragma
redefine_extname is applicable to external C declarations only; not applied to
function 'foo_cpp'}}
+// CHECK-NOT: define i32 @bar_cpp()
----------------
Likewise.
http://reviews.llvm.org/D10805
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