Don't complain about falling off the end of a function with an asm

block, if the function is supposed to return a value as we don't know
exactly what the asm code does.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91073 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDecl.cpp

@@ -1253,6 +1253,11 @@ Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) {
       HasFakeEdge = true;
       continue;
     }
+    if (isa<AsmStmt>(S)) {
+      HasFakeEdge = true;
+      HasLiveReturn = true;
+      continue;
+    }
     bool NoReturnEdge = false;
     if (CallExpr *C = dyn_cast<CallExpr>(S)) {
       Expr *CEE = C->getCallee()->IgnoreParenCasts();

test/Sema/return.c

@@ -222,3 +222,7 @@ void test32() {
 void test33() {
   if (j) while (1) { }
 }
+
+int test34() {
+  asm("nop");
+}