Laszlo Nagy fc7eb4ad91 recognition: probe cc/c++ to pick clang vs gcc on BSD/macOS hosts ...

`cc` and `c++` are GCC on most Linuxes but Clang on FreeBSD,
OpenBSD, NetBSD, DragonFly, and macOS. The regex defaulted them
to GCC, which corrupted the compilation database on those hosts
via wrong flag-arity tables (e.g. Clang's `-Xclang <arg>`
consumes the next argv slot, GCC's does not).

Recognition now runs `--version` lazily for these ambiguous
basenames, classifies by signature, and dispatches accordingly.
The probe is the sole classifier: gcc.yaml deliberately omits
`cc`/`c++`, so a failed probe returns NotRecognized rather than
guessing -- a missing entry is visible and debuggable, whereas a
wrongly-classified entry corrupts the database silently via
mismatched flag-arity tables (the bug this work exists to fix).

Layered design:
- CompilerRecognizer dispatches.
- CompilerProbe classifies. VersionProbe on Unix (hardened:
  closed stdin, process-group SIGKILL on timeout, LD_PRELOAD /
  DYLD_INSERT_LIBRARIES stripped); NoProbe on Windows where
  basenames are unambiguous and the Unix subprocess primitives
  the probe relies on aren't available.
- CachingProbe memoizes the probe's verdict per canonical path
  so each unique compiler is fork-exec'd at most once per
  process.

A user `compilers:` entry preempts the probe -- the sole
supported override.

Also simplifies the WrapperInterpreter that the probe work
exposed: replaces the cyclic Arc::new_cyclic +
OnceLock<Box<dyn Interpreter>> + Weak<dyn Interpreter> machinery
with a flat wrapper::unwrap() helper called inline from
CompilerInterpreter::recognize.

See requirements/recognition-ambiguous-name-probe.md for the spec.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-03 14:00:59 +00:00

..

src

build: drop regex crate in favor of regex-lite

2026-04-27 10:12:26 +00:00

tests

recognition: probe cc/c++ to pick clang vs gcc on BSD/macOS hosts

2026-05-03 14:00:59 +00:00

Cargo.toml

build: drop regex crate in favor of regex-lite

2026-04-27 10:12:26 +00:00

CLAUDE.md

docs: explain the build pipeline per crate

2026-04-30 11:57:36 +00:00