aaron.ballman requested changes to this revision.
aaron.ballman added a comment.
This revision now requires changes to proceed.

The patch is also missing Sema tests that ensure the attributes are properly 
diagnosed when applied to something other than a function, a target other than 
AVR, arguments are present, etc.



================
Comment at: include/clang/Basic/Attr.td:485
+  let ParseKind = "Interrupt";
+  let Documentation = [Undocumented];
+}
----------------
No new undocumented attributes, please.


================
Comment at: include/clang/Basic/Attr.td:488
+
+def AVRSignal : InheritableAttr, TargetSpecificAttr<TargetAVR> {
+  let Spellings = [GNU<"signal">];
----------------
Does this attribute appertain to any specific subjects, or can you apply it to 
any declaration?


================
Comment at: include/clang/Basic/Attr.td:490
+  let Spellings = [GNU<"signal">];
+  let Documentation = [Undocumented];
+}
----------------
No new undocumented attributes, please.


================
Comment at: test/CodeGen/avr/attributes/naked.c:4
+// CHECK: define void @foo() #0
+__attribute__((naked)) void foo(void) { }
+
----------------
This test seems unrelated as you didn't modify anything about the naked 
attribute?


https://reviews.llvm.org/D28451



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