[all-commits] [llvm/llvm-project] 87dbdd: [FileCheck] Default --allow-unused-prefixes to false

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 87dbdd2e3bb63b681f8cc3179ef5c2d5929bbf61
      https://github.com/llvm/llvm-project/commit/87dbdd2e3bb63b681f8cc3179ef5c2d5929bbf61
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-02-08 (Mon, 08 Feb 2021)

  Changed paths:
    M clang/test/Driver/crash-report-null.test
    M clang/test/OpenMP/lit.local.cfg
    M clang/test/lit.cfg.py
    M llvm/test/FileCheck/allow-unused-prefixes.txt
    M llvm/test/FileCheck/lit.local.cfg
    M llvm/test/Other/opt-bisect-legacy-pass-manager.ll
    R llvm/test/Reduce/lit.local.cfg
    M llvm/test/Transforms/Attributor/lit.local.cfg
    M llvm/test/lit.cfg.py
    M llvm/utils/FileCheck/FileCheck.cpp

  Log Message:
  -----------
  [FileCheck] Default --allow-unused-prefixes to false

Link: https://lists.llvm.org/pipermail/llvm-dev/2020-October/146162.html "[RFC] FileCheck: (dis)allowing unused prefixes"

If a downstream project using lit needs time for transition,
add the following to `lit.local.cfg`:

```
from lit.llvm.subst import ToolSubst

fc = ToolSubst('FileCheck', unresolved='fatal')
config.substitutions.insert(0, (fc.regex, 'FileCheck --allow-unused-prefixes'))
```

Differential Revision: https://reviews.llvm.org/D95849