Bazel and Glibc Versions

6 hours ago

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Bazel's caching and remote execution can lead to issues with differing glibc versions across environments.
A scenario where a developer's build passes locally but fails in production due to a missing GLIBC version.
The problem arises because Bazel's C/C++ action keys do not account for system-level dependencies like glibc versions.
Three solutions are proposed: manually partitioning the action cache (AC), restricting AC writes to remote execution (RE) only, and using sysroots.
Solution A involves capturing and comparing local and remote glibc versions to modify cache keys.
Solution B suggests restricting AC writes to RE workers to control the build environment.
Solution C, using sysroots, is the most robust but complex, involving multiple glibc versions and modifying the Bazel C/C++ toolchain.
The article emphasizes the importance of addressing glibc version skew to prevent production failures.

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