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@bazel-io bazel-io released this 25 Jun 23:01
9.2.0rc1
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The following release notes are still in the process of being updated and cleaned up.

Release 9.2.0rc1 (2026-06-25)

Release Notes:

Configurability:

  • The new refines_constraint_value attribute on constraint_setting can be used to indicate that any non-default value for that setting specified on a platform requires the refined value to also be specified. (#29727)
  • Bazel no longer crashes when a label_list_dict attribute is used in a split transition (#29830). (#29856)

Core:

  • External repos are no longer refetched whenever they contribute inputs to an action using the hermetic Linux sandbox. (#29889)

ExternalDeps:

  • Added SOCKS proxy support. Bazel now accepts socks://, socks4://, and socks5:// URLs in HTTPS_PROXY/HTTP_PROXY environment variables and related system properties. (#29364)
  • Adds the strip_components attribute to extract/download_and_extract/http_archive to allow stripping of path components when extracting files. (#29369)
  • Added the module_ctx.tag_sort_key(tag) method, which returns an opaque object for the given tag that can be compared to derive the order in which tags from different classes appear in the MODULE.bazel file. (#29484)
  • module_extension(...) now accepts a facts_version integer parameter. Bumping it invalidates the facts persisted in MODULE.bazel.lock for that extension, allowing extension authors to make breaking changes to the facts schema without risking misinterpretation by older code paths. (#29871)
  • The remote repo contents cache now correctly materializes chains of symlinks as action inputs, but no longer supports symlinks into the main repository. (#29959)

OSS:

  • Fixed Bazel being unable to run a Windows executable whose path is too long to shorten under MAX_PATH, e.g. when 8dot3 short names are disabled (microsoft/Windows-Containers#507). (#29984)

Performance:

  • Fixed a performance regression in Bazel 9 that causes RepoMappingManifest actions to consume a lot of CPU time. (#29807)

Remote-Exec:

  • Enable TCP keepalive by default for gRPC connections with reasonable defaults (#29898)
  • Fixed repo content caching for non-gRPC cache backends. (#29869)

Starlark-Integration:

  • create --incompatible_remove_ctx_android_fragment for Starlark Flags migration (#29884)

Acknowledgements:

This release contains contributions from many people at Google, as well as Ara Nguyen, Ashutosh0x, bazel.build machine account, Bryce Lampe, Chi Wang, Fabian Meumertzheim, Fredrik Medley, gaurav0107, Greg, Grzegorz Lukasik, Jacob Nowjack, John Cater, JonathanPerry651, Keith Smiley, peakschris, Rgis Desgroppes, Richard Lavoie, Sarad, Son Luong Ngoc, Tamir Duberstein, Tyler French, vadim, Will Stranton, Xudong Yang, Xùdōng Yáng, Yonatan Goldschmidt.

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