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# Understanding CROSSTOOL
-* [Overview](#overview)
-* [`CROSSTOOL` proto structure](#crosstool-proto-structure)
-* [Toolchain selection](#toolchain-selection)
-* [`CROSSTOOL` features](#crosstool-features)
- * [Feature relationships](#feature-relationships)
-* [`CROSSTOOL` actions](#crosstool-actions)
- * [Assembler actions](#assembler-actions)
- * [Compiler actions](#compiler-actions)
- * [Link actions](#link-actions)
- * [AR actions](#ar-actions)
- * [LTO actions](#lto-actions)
-* [`CROSSTOOL` action_config`](#crosstool-action_config)
- * [`tool` messages](#tool-messages)
- * [Example usage](#example-usage)
- * [Flag groups](#flag-groups)
- * [Conditional expansion](#conditional-expansion)
-* [`CROSSTOOL` reference](#crosstool-reference)
- * [`CROSSTOOL` build variables](#crosstool-build-variables)
- * [`CROSSTOOL` features](#crosstool-features)
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To get hands-on with `CROSSTOOL`, see the
[Configuring `CROSSTOOL`](tutorial/crosstool.html) tutorial.
