From: Fariborz Jahanian <fjahanian@apple.com>
Date: Tue, 12 Jan 2010 18:33:57 +0000 (+0000)
Subject: Define __weak attribute for objective-c pointers in
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=453c1349a5dfb581d960df3e1bcd266d6ba68277;p=clang

Define __weak attribute for objective-c pointers in
win32 targets. Fixes radar 7530235. Daniel please review.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93246 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index ac13b95075..ef3cf89299 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -994,6 +994,10 @@ public:
     DefineStd(Builder, "WIN32", Opts);
     DefineStd(Builder, "WINNT", Opts);
     Builder.defineMacro("_X86_");
+    if (Opts.ObjC1)
+      // __weak is always defined, for use in blocks and with objc pointers,
+      // even for i686-pc-win32 targets.
+      Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
   }
 };
 } // end anonymous namespace
diff --git a/test/Rewriter/rewrite-weak-attr.m b/test/Rewriter/rewrite-weak-attr.m
new file mode 100644
index 0000000000..2e559ee3e3
--- /dev/null
+++ b/test/Rewriter/rewrite-weak-attr.m
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -triple i686-pc-win32 -fms-extensions -fblocks -Dnil=0 -rewrite-objc  -o - %s
+int main() {
+        __weak __block id foo = nil;
+        __block id foo2 = nil;
+        id foo3 = nil;
+        
+        void (^myblock)() = ^{
+                foo = nil;
+                foo2 = nil;
+                [foo3 bar];
+                id foo4 = foo3;
+        };
+}