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

2 files changed, 17 insertions, 0 deletions

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;
+        };
+}