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Restoring /opt/homebrew/Cellar/qt from the cache brought back Qt's files but not Homebrew's symlinks, while the cache hit skipped `brew install qt`. Since `brew --prefix qt` prints /opt/homebrew/opt/qt even when Qt is not installed, the PATH silently pointed at a missing directory and qmake was not found. - Cache only the downloaded bottles, never the Cellar. - Always run `brew install qt`; it is a no-op when Qt is present and it is what creates the symlinks the later steps rely on. - Export the Qt bin directory once through $GITHUB_PATH. - Fail early with an explicit `qmake --version` check.
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Summary
The macOS job started failing with
qmake: command not foundas soon as the Homebrew cache was populated by an earlier green run.Two things combined:
/opt/homebrew/Cellar/qtbrings back Qt's files but not Homebrew's symlinks (/opt/homebrew/opt/qt, thebin/entries), and the cache hit skippedbrew install qt, which is what creates them.brew --prefix qtprints/opt/homebrew/opt/qteven when Qt is not installed, soexport PATH="$(brew --prefix qt)/bin:$PATH"silently pointed at a missing directory instead of failing.Changes, macOS job only:
~/Library/Caches/Homebrew/downloads), never the Cellar.brew install qt— a no-op when Qt is already installed, and the step that creates the symlinks the rest of the job relies on.bindirectory once through$GITHUB_PATHinstead of repeatingexport PATHin every step.qmake --versioncheck so a broken toolchain fails at install time with a clear message.Always cache brewstep;actions/cache@v5saves in its post-step.The Windows and Ubuntu jobs are untouched.
Test plan
build-macosreachesCheck Qt installationand prints a Qt versionbuild-macosconfigures, builds, and runs the testsbuild-windowsandbuild-ubuntustay green