dankm added inline comments.

================
Comment at: clang/test/CodeGen/debug-prefix-map.cpp:1
+// RUN: %clang++ -g -fdebug-prefix-map=%p=./UNLIKELY_PATH/empty -S -c %s 
-emit-llvm -o - | FileCheck %s --check-prefix=CHECK-REL
+
----------------
aaron.ballman wrote:
> I'm taking a guess at correcting the RUN line here, but more tweaks may be 
> needed. Basically, `%clang++` isn't a thing, so this test fails. Most of our 
> tests should be testing `%clang_cc1` to test the frontend invocation, but 
> some of the debug prefix map tests use `%clang` to test the driver 
> functionality. I don't think there's a need to test the driver here, so I 
> went with `%clang_cc1`. I'm not 100% certain whether `-debug-info-kind=` is 
> necessary or not, but the other tests seem to be using that, which may be 
> worth paying attention to.
> 
> Finally, there's no need to have a custom check prefix for `FileCheck`, the 
> builtin `CHECK` prefix suffices.
Okay, noted about clang++, it did work for me locally, but that doesn't mean 
it's correct. Good point about only testing the frontend action, the driver 
test is unnecessary.

The custom check prefix is just a cut & paste artefact from copying from the C 
version of the debug-prefix-map test, originally I was going to update that 
test to a C++ file but opted later for just creating a new test.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149272/new/

https://reviews.llvm.org/D149272

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