Don't complain about missing return statements for naked

functions. Fixes <rdar://problem/9731999>.

llvm-svn: 134897

clang/lib/Sema/SemaDecl.cpp

@@ -6457,6 +6457,10 @@ Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
       // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
       FD->setHasImplicitReturnZero(true);
       WP.disableCheckFallThrough();
+    } else if (FD->hasAttr<NakedAttr>()) {
+      // If the function is marked 'naked', don't complain about missing return
+      // statements.
+      WP.disableCheckFallThrough();
     }
 
     // MSVC permits the use of pure specifier (=0) on function definition,

clang/test/Sema/attr-naked.c

@@ -2,6 +2,10 @@
 
 int a __attribute__((naked)); // expected-warning {{'naked' attribute only applies to functions}}
 
+__attribute__((naked)) int t0(void) { 
+  __asm__ volatile("mov r0, #0");
+}
+
 void t1() __attribute__((naked));
 
 void t2() __attribute__((naked(2))); // expected-error {{attribute takes no arguments}}