Add a command line option 'fregister_global_dtors_with_atexit' to

register destructor functions annotated with __attribute__((destructor))
using __cxa_atexit or atexit.

Register destructor functions annotated with __attribute__((destructor))
calling __cxa_atexit in a synthesized constructor function instead of
emitting references to the functions in a special section.

The primary reason for adding this option is that we are planning to
deprecate the __mod_term_funcs section on Darwin in the future. This
feature is enabled by default only on Darwin. Users who do not want this
can use command line option 'fno_register_global_dtors_with_atexit' to
disable it.

rdar://problem/33887655

Differential Revision: https://reviews.llvm.org/D45578

llvm-svn: 330199

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 27b0677d49b..84118a50c1d 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -3696,6 +3696,9 @@ public:
   void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::Constant *fn,
                                     llvm::Constant *addr);
 
+  /// Call atexit() with function dtorStub.
+  void registerGlobalDtorWithAtExit(llvm::Constant *dtorStub);
+
   /// Emit code in this function to perform a guarded variable
   /// initialization.  Guarded initializations are used when it's not
   /// possible to prove that an initialization will be done exactly