[AIX] report_fatal_error on `-fregister_global_dtors_with_atexit` for static init

On AIX, the semantic of global_dtors contains __sterm functions associated with C++
cleanup actions and user-declared __attribute__((destructor)) functions. We should
never merely register __sterm with atexit(), so currently
-fregister_global_dtors_with_atexit does not work well on AIX: It would cause
finalization actions to not occur when unloading shared libraries.  We need to figure
out a way to handle that when we start supporting user-declared
__attribute__((destructor)) functions.

Currently we report_fatal_error on this option temporarily.

Differential Revision: https://reviews.llvm.org/D83974

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 4ae8ce7e5ccf..4c792520b5f3 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1209,6 +1209,9 @@ void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
 /// when the module is unloaded.
 void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
   if (CodeGenOpts.RegisterGlobalDtorsWithAtExit) {
+    if (getCXXABI().useSinitAndSterm())
+      llvm::report_fatal_error(
+          "register global dtors with atexit() is not supported yet");
     DtorsUsingAtExit[Priority].push_back(Dtor);
     return;
   }