mstorsjo added a comment.

A different but slightly similar case, where I've run into these errors too, 
FWIW: On ARM, when compiling with a hardfloat target, Clang does consider a 
function pointer with `__attribute__((pcs("aapcs-vfp")))` different from one 
without, even if the default still in the end would end up equal to it. I guess 
the problem there is that Clang doesn't know what the default implicit calling 
convention is (and that's something that ends up resolved on the LLVM side 
while lowering code) - while e.g. Clang does know that `__cdecl` is equivalent 
to not declaring any calling convention at all.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D131351/new/

https://reviews.llvm.org/D131351

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