Paolo Tranquilli d0b6e96e5b Make CODEQL_PLATFORM architecture-aware for linux-arm64
CODEQL_PLATFORM is OS-only today (linux->linux64, macos->osx64,
windows->win64). ELF has no fat-binary equivalent, so Linux arm64 needs
its own string. Add `linux-arm64` for os:linux AND cpu:arm64 while
keeping every existing string byte-identical.

- Add a public `//misc/bazel:linux_arm64` config_setting (os:linux +
  cpu:arm64).
- Turn `os_select` into `codeql_platform_select`, a full selector over
  the four CodeQL platforms (`linux64`, `linux_arm64`, `osx64`, `win64`,
  plus `otherwise`), working in both macro (select) and rule
  (target_platform_has_constraint) contexts. There is deliberately no
  fallback between the two Linux slots.
- Re-express `os_select` as a thin OS-only wrapper around it (Linux maps
  to both `linux64` and `linux_arm64`), so its existing swift/xcode
  callers keep working unchanged.
- Add an `_arm64_constraint` entry to OS_DETECTION_ATTRS.
- Drive the platform string from `codeql_platform_select` in pkg.bzl's
  `_detect_platform` and defs.bzl's `codeql_platform`.

macOS keeps osx64 for both arch slices (universal binary): the
linux_arm64 key requires both constraints, so the OS discriminator
dominates. The new branch is dormant on existing CI (no job builds
linux-on-arm64), so all current configs produce byte-identical outputs.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: c5c5b0bf-4afa-468c-b2dd-197d80932b4b
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CodeQL

This open source repository contains the standard CodeQL libraries and queries that power GitHub Advanced Security and the other application security products that GitHub makes available to its customers worldwide.

How do I learn CodeQL and run queries?

There is extensive documentation about the CodeQL language, writing CodeQL using the CodeQL extension for Visual Studio Code and using the CodeQL CLI.

Contributing

We welcome contributions to our standard library and standard checks. Do you have an idea for a new check, or how to improve an existing query? Then please go ahead and open a pull request! Before you do, though, please take the time to read our contributing guidelines. You can also consult our style guides to learn how to format your code for consistency and clarity, how to write query metadata, and how to write query help documentation for your query.

For information on contributing to CodeQL documentation, see the "contributing guide" for docs.

License

The code in this repository is licensed under the MIT License by GitHub.

The CodeQL CLI (including the CodeQL engine) is hosted in a different repository and is licensed separately. If you'd like to use the CodeQL CLI to analyze closed-source code, you will need a separate commercial license; please contact us for further help.

Visual Studio Code integration

If you use Visual Studio Code to work in this repository, there are a few integration features to make development easier.

CodeQL for Visual Studio Code

You can install the CodeQL for Visual Studio Code extension to get syntax highlighting, IntelliSense, and code navigation for the QL language, as well as unit test support for testing CodeQL libraries and queries.

Tasks

The .vscode/tasks.json file defines custom tasks specific to working in this repository. To invoke one of these tasks, select the Terminal | Run Task... menu option, and then select the desired task from the dropdown. You can also invoke the Tasks: Run Task command from the command palette.

Description
CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security
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