Thanks to recent improvements in #67663, InvalidPtr checker does not
emit any false positives on the following OS projects: memcached, tmux,
curl, twin, vim, openssl, sqlite, ffmpeg, postgres, tinyxml2, libwebm,
xerces, bitcoin, protobuf, qtbase, contour, acid, openrct2. (Before the
changes mentioned above, there were 27 reports, catching the `getenv`
invalidates previous `getenv` results cases. That strict behaviour is
disabled by default)
Introduce 'InvalidatingGetEnv' checker option for 'getenv' calls.
- POSIX suggests consecutive 'getenv' calls may invalidate
pointer pointers. This is often too strict in real-world scenarios.
- New 'InvalidatingGetEnv' checker option provides a more
pragmatic default that doesn't treat consecutive 'getenv'
calls as invalidating.
- Now also handles main function specifications with an
environment pointer as the third parameter.
Original Phabricator review:
https://reviews.llvm.org/D154603
