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This commit fixes the macOS Bazel build failures in Kokoro by: 1. Disabling the experimental downloader config in .bazelrc. The build was attempting to download dependencies from an outdated mirror, which resulted in 404 errors. 2. Re-enabling the default Apple C++ toolchain. The build was explicitly disabling the default toolchain without providing an alternative, which caused toolchain resolution errors. The original reason for disabling the toolchain, a gRPC incompatibility with Bazel 7 (as documented in #13311), is no longer relevant as the project now uses a version of gRPC that is compatible with Bazel 7.
This commit removes the dependency on from . This dependency is very old and is incompatible with modern Bazel's C++ toolchain resolution, especially when using bzlmod. Removing this dependency allows Bazel to use its built-in toolchain configuration, which should fix the toolchain resolution errors on macOS. This change is part of the effort to get the macOS Kokoro CI builds working.
This commit updates the @rules_cc dependency to a modern version (0.9.0) and updates the capture_build_info.bzl file to use the correct load statements. This change is necessary because modern versions of Bazel have externalized the C++ rules into the @rules_cc repository.
This commit removes an outdated dependency fetching loop from the ci/kokoro/macos/builds/bazel.sh script. The script was attempting to fetch the C++ toolchain and other dependencies as external repositories, which is incorrect for modern Bazel with bzlmod. By removing this loop, we allow Bazel and bzlmod to handle dependency resolution and toolchain configuration automatically. The --toolchain_resolution_debug flag has been added to get more information in case of further build failures. This commit also disables the -Werror flag for the boringssl library for all builds. This is necessary to resolve a compilation error caused by a conflict between the boringssl headers and a system-installed version of OpenSSL on macOS.
This commit adds the -nostdinc flag to the boringssl dependency in MODULE.bazel. This is necessary to prevent the compiler from finding a system-installed version of OpenSSL on macOS, which was causing a compilation failure due to header conflicts.
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