From: Chris Lattner <sabre@nondot.org>
Date: Wed, 26 Sep 2007 22:06:30 +0000 (+0000)
Subject: objc messages have side effects, return true from hasLocalSideEffect,
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a9c01021724b9b546d282b8609cbe559734812ec;p=clang

objc messages have side effects, return true from hasLocalSideEffect,
fixing:

VoidMethod.m:14:5: warning: expression result unused
    [Greeter hello];
    ^~~~~~~~~~~~~~~



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42380 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/AST/Expr.cpp b/AST/Expr.cpp
index ffd2d3e8d5..0b1c7994ff 100644
--- a/AST/Expr.cpp
+++ b/AST/Expr.cpp
@@ -259,6 +259,8 @@ bool Expr::hasLocalSideEffect() const {
     // TODO: check attributes for pure/const.   "void foo() { strlen("bar"); }"
     // should warn.
     return true;
+  case ObjCMessageExprClass:
+    return true;
     
   case CastExprClass:
     // If this is a cast to void, check the operand.  Otherwise, the result of
diff --git a/clang.xcodeproj/project.pbxproj b/clang.xcodeproj/project.pbxproj
index fca0464b47..04dad73923 100644
--- a/clang.xcodeproj/project.pbxproj
+++ b/clang.xcodeproj/project.pbxproj
@@ -733,7 +733,6 @@
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			buildConfigurationList = 1DEB923508733DC60010E9CD /* Build configuration list for PBXProject "clang" */;
-			compatibilityVersion = "Xcode 2.4";
 			hasScannedForEncodings = 1;
 			mainGroup = 08FB7794FE84155DC02AAC07 /* clang */;
 			projectDirPath = "";
diff --git a/test/Sema/objc-unused.m b/test/Sema/objc-unused.m
new file mode 100644
index 0000000000..cbe15a1abb
--- /dev/null
+++ b/test/Sema/objc-unused.m
@@ -0,0 +1,18 @@
+// RUN: clang %s -verify -fsyntax-only
+#include <stdio.h>
+
+@interface Greeter
++ (void) hello;
+@end
+
+@implementation Greeter
++ (void) hello {
+    fprintf(stdout, "Hello, World!\n");
+}
+@end
+
+int main (void) {
+    [Greeter hello];
+    return 0;
+}
+