Worked on the denoland/chromium_build repository to enhance build system reliability and platform support. Addressed naming collisions in proc-macro crate outputs by appending the epoch to output filenames, ensuring unique file generation across crate versions and reducing cross-version conflicts. Re-enabled CREL on arm32 targets by removing a disabling condition, broadening diagnostic coverage and confirming CREL availability on additional architectures. Added targeted tests to validate the new naming scheme and platform diagnostics. Leveraged GN and Rust build tools to implement these changes, focusing on build system configuration and platform compatibility. The work improved stability and reduced the risk of platform-specific issues.