Creating C++ Toolchains Easily
summary
New rules_cc toolchain mechanism defines C++ toolchains as rule-based use labels not strings mappings: a cc_toolchain points to a cc_tool_map that maps action types (C compile, C++ compile, link) to tools like clang, lld, ar and their data (built‑in headers). Toolchains add ordered args and features to expand variables into command lines, catching typos at build file parse time. It’s already deployed in Pigweed and rule_cc CI, supports Linux/Mac and Raspberry Pi Pico cross‑builds, and largely works though an experimental shim and migration docs remain.
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chapters (7)
- 0:00C++ toolchains intro
- 7:10Legacy toolchain problems
- 10:20New config basics
- 16:37Core toolchain constructs
- 22:13Adoption and future
- 24:23Q&A: Migration testing
- 30:23Q&A: Compatibility safety
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