tra added inline comments.

================
Comment at: llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.cpp:58
+        ((IsCtor ? "__init_array_object_" : "__fini_array_object_") +
+         F->getName() + "_" + getHash(M.getName()) + "_" +
+         std::to_string(Priority))
----------------
jhuber6 wrote:
> tra wrote:
> > Source file name may be a little bit better, though it's still easy to 
> > clash if someone does `cd A; clang ./foo.c; cd ../B; clang ./foo.c` and the 
> > file name uses relative paths.
> > 
> > I think we'll need a way to override this unique suffix explicitly as an 
> > escape hatch for cases where someone runs into a clash.
> I figured it'd be good enough since this is admittedly *very* niche. So 
> someone would need to have a file called `foo.c` that also had a constructor 
> called `foo` in it. For it to clash. Isn't it too late to grab the source 
> filename while we're in the backend lowering stage?
> someone would need to have a file called foo.c that also had a constructor 
> called foo in it

Unlikely != impossible.  It's a trade-off between the hassle of implementing 
the plan B and the hassle of debugging and working around the clash for someone 
who runs into this.
On one hand that's indeed unlikely to happen, but, given enough exposure, 
someone/somewhere will run into it and they will likely be ill-equipped to even 
tell what's going on.
In general, compiler options are logistically much easier to deal with compared 
to having to change the source code.

> Isn't it too late to grab the source filename while we're in the backend 
> lowering stage?

The module already has the file name recorded and available via 
`llvm::Module::getSourceFileName()`, so it's as easy to get as the module name.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149451/new/

https://reviews.llvm.org/D149451

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