IRgen: Support user defined attributes on block runtime functions.
- This issue here is that /usr/include/Blocks.h wants to define some of the
block runtime globals as weak, depending on the target. This doesn't work in
Clang because we aren't using the AST decl for these globals.
- The fix is a pretty gross hack which just watches all the decls for the
specific blocks globals we need to know about; if we see one we use it,
otherwise we use the hand coded type.
In time, I would like to clean this up by changing IRgen to ask Sema/AST for
the decl, which would then be lazily loaded from the builtin table if
necessary. This could be used in a whole host of places in IRgen and would
get rid of a lot of grotty hand coding of LLVM IR; however, we need some
extra Sema support for this as well as support for builtin global variables.
llvm-svn: 108482
diff --git a/clang/test/CodeGen/block-decl-merging.c b/clang/test/CodeGen/block-decl-merging.c
new file mode 100644
index 0000000..5a3d95b
--- /dev/null
+++ b/clang/test/CodeGen/block-decl-merging.c
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -triple i386-apple-darwin10 -fblocks -emit-llvm -o - %s | \
+// RUN: FileCheck %s
+
+// CHECK: @_NSConcreteGlobalBlock = extern_weak global
+extern void * _NSConcreteStackBlock[32] __attribute__((weak_import));
+// CHECK: @_NSConcreteStackBlock = extern_weak global
+extern void * _NSConcreteGlobalBlock[32] __attribute__((weak_import));
+// CHECK: declare extern_weak void @_Block_object_dispose
+extern void _Block_object_dispose(const void *, const int) __attribute__((weak_import));
+// CHECK: declare extern_weak void @_Block_object_assign
+extern void _Block_object_assign(void *, const void *, const int) __attribute__((weak_import));
+
+void *x = ^(){};
+
+void f1(void (^a0)(void));
+
+void f0() {
+ __block int x;
+ f1(^(void){ x = 1; });
+}