Allow functions to be marked "implicit return zero" and so mark main().
Codegen by initializing the return value with its LLVM type's null value.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77288 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 7ab7356..9b6de12 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -3501,8 +3501,11 @@
Stmt *Body = BodyArg.takeAs<Stmt>();
if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) {
FD->setBody(Body);
- if (!FD->isMain())
+ if (FD->isMain())
// C and C++ allow for main to automagically return 0.
+ // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
+ FD->setHasImplicitReturnZero(true);
+ else
CheckFallThroughForFunctionDef(FD, Body);
if (!FD->isInvalidDecl())