name: Detect ifdef/defined (mis)use

on: [push, pull_request]

jobs:
  find-misuse:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - run: |
        printf '(^#ifn?def[[:space:]]+|defined[[:space:]]*[(][[:space:]]*)((%s)([^_A-Za-z0-9]|$))\0' \
                  "$(printf '%s' "$(awk '/#mesondefine/ { print $2 }' mlibc-config.h.in)" | tr '\n' '|')" \
                | { ! xargs -0I '{}' grep --color=always -PR '{}' \
                || { echo 'found misuse'; exit 1; }; }


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