yln marked an inline comment as done.
yln added inline comments.

================
Comment at: llvm/lib/CodeGen/TargetPassConfig.cpp:900
+  // __cxa_atexit calls to avoid emitting the deprecated __mod_term_func.
+  if (TM->getTargetTriple().isOSBinFormatMachO())
+    addPass(createLowerGlobalDtorsLegacyPass());
----------------
yln wrote:
> delcypher wrote:
> > Random thought. Do we want to support the legacy way of calling 
> > destructors, rather than removing it entirely? If we were to do such a 
> > thing I'd suspect we'd guard using the legacy way on the OS deployment 
> > target.
> > 
> > Just to be clear. I'm happy with the patch the way it is. I'm just 
> > wondering if we should consider allowing the legacy way as well. I can't 
> > see an obvious use case for it because the new way should work on older OSs 
> > too but maybe there's a use case I haven't thought about?
> Having a way to explicitly request the old behavior sounds like a good idea.  
> I will look into it.
I added an escape hatch to fallback to the old behavior:
* via Clang driver flag `-fregister-global-dtors-with-atexit`
* llc / code generation flag -lower-global-dtors-via-cxa-atexit.
This escape hatch will be removed in the future.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D121327/new/

https://reviews.llvm.org/D121327

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