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Generate each distinct Python version and flag predicate once per toolchain repository and reuse it across py_toolchain_suite calls. In our repo, this removes 79MB of retained heap.
aignas
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Sep 15, 2026
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Generated toolchain BUILD files repeat Python version
config_settingpredicates for each suite.toolchain_suites_contentnow emits each distinct predicate once and passes its label topy_toolchain_suite, preserving version matching while reducing retained configuration data.In our repo, this removes 79MB of retained heap.
Validation:
buildifier -mode=checkon the three changed files andgit diff --checkpassed.bazel test --config=fast-tests --jobs=4 //tests/toolchains/... //tests/config_settings/...passed (36 passed, 1 skipped).