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docs: explain version requirements and where clang tools come from (v3) - #531
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The `version` input still pointed at clang-tools-pip and only listed major versions. v3 passes it to cpp-linter v2 as a semantic version requirement, so `18.1.8` means 18.1.8 or a newer 18.x release and `=18.1.8` means exactly that version. Also list the sources v3 tries, in order, for every runner (installed tool, cache, system package manager, PyPI, static binaries).
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Docs only, for the v3 branch (#283).
versioninput: it still pointed at clang-tools-pip and only listed major versions. In v3 it is a semantic version requirement, so the description now says that18.1.8accepts 18.1.8 or a newer 18.x release,=18.1.8requires exactly that version, and ranges like>=17, <20work. A user on Moving toward v3 #283 / Allow to specify minor/patch version for clang-format #292 set18.1.8and was surprised by what got installed.docs/required-tools.md: the per-OS source lists described v2 (static binaries before PyPI, no package manager on Windows). Replaced them with the order cpp-linter v2 uses on every runner: installed tool, cache, system package manager (apt with LLVM's apt repository, dnf, pacman, Homebrew / Homebrew / Chocolatey, winget), PyPI, static binaries. The link now points to clang-tools-static-binaries.pacmanandwinget.