[llvm-dev] Strip IR metadata information in a unit test

[Arthur Eubanks via llvm-dev]

I usually end up writing a short bash script which runs `path/to/opt $@
-foo |& grep 'the error/assert message'` and use that as the
interestingness test

On Thu, Nov 18, 2021 at 10:43 AM Michael Kruse via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Am Do., 18. Nov. 2021 um 12:34 Uhr schrieb Mingming Liu via llvm-dev
> <llvm-dev at lists.llvm.org>:
> > I'm a little confused how the custom script (specified by --test arg)
> tells llvm-reduce if something is interesting in the IR.
> >
> > Is it a common practice to wrap "llvm-lit <IR>" into a shell script to
> simplify IR for a unit test?
>
> Yes, it is expected that you write your own "interesting-ness" script.
> However I don't think you can use llvm-lit (which requires a `RUN:`
> command comment in the file that llvm-reduce does not emit). Instead,
> take the command that llvm-lit would execute (Execute with -v flag)
> and instead of the test file (%s in the `RUN: ` command), pass $1 to
> the opt/llc executable within your script. Check whether it has failed
> with `%?`.
>
> Michael
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