[PATCH] D92404: [FileCheck] Enforce --allow-unused-prefixes=false for llvm/test/Transforms

[Pengfei Wang via Phabricator via llvm-commits]

pengfei added a comment.

Cheers~



================
Comment at: llvm/utils/update_test_prefix.py:22
-            s = re.sub('-?-check-prefixes=([^, ]+\n)', '--check-prefix=\\1', s)
-            s = re.sub('-?-check-prefixes=([^, ]+) ', '--check-prefix=\\1', s)
             t = re.search('-?-check-(?:prefix|prefixes)=([^ ]+)\s+-?-check-(?:prefix|prefixes)=([^ ]+)', s)
----------------
mtrofin wrote:
> pengfei wrote:
> > I think we just need to add a space for it:
> > ```
> > s = re.sub('-?-check-prefixes=([^, ]+) ', '--check-prefix=\\1 ', s)
> > ```
> > I once worried we may leave space at the end but didn't consider %s case.
> > `\w+` is not always correct because many prefixes are using `-` in them.
> how about 
> 
> s = re.sub('-?-check-prefixes=([\w_-]+)', '--check-prefix=\\1', s)
> 
> So it'd avoid the extra space, too? Or do we allow other characters?
I might tend to conservative. As far as I can see it, `[\w-]` should be Okay. But you need to check the last character is `'\n'` or `' '`. Otherwise it will turn somthing `-check-prefixes=A,B` into `-check-prefix=A,B`. Maybe you can use below:
```
s = re.sub('-?-check-prefixes=([\w-]+\s)', '--check-prefix=\\1', s)
```


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  https://reviews.llvm.org/D92404/new/

https://reviews.llvm.org/D92404