Support Bazel 9 rule migration and JavaCC - #374
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Load C++ rules explicitly in repository-owned BUILD overlays and enable external rule migration for third-party packages that still reference removed native C++ and proto rules. Run JavaCC with the complete Java 21 runtime toolchain instead of local JDK file targets that are unavailable under Bazel 9.
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This was referenced Aug 23, 2026
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Bazel 9 removes native C++ and proto rules used by several transitive
dependencies and no longer exposes the local JDK file targets referenced
by the JavaCC parser rules.
Load C++ rules explicitly in emulator-owned BUILD overlays, enable
Bazel's external-rule migration for unchanged third-party BUILD files,
and run JavaCC using the complete Java 21 runtime toolchain. The
migration flag remains supported by the project's pinned Bazel 7.6.1.