sysroot/compile: add macOS arm64 cross-compilation support#4656
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mathetake wants to merge 7 commits into
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sysroot/compile: add macOS arm64 cross-compilation support#4656mathetake wants to merge 7 commits into
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Add repository rules and build scripts for cross-compiling to macOS arm64 from Linux x86_64: - sysroot.bzl: add `macos_sysroot` rule and `setup_macos_sysroot()` for macOS SDK sysroot (headers, frameworks, .tbd stubs) - libcxx_libs.bzl: add `libcxx_libs_darwin` rule and `setup_libcxx_libs_darwin()` for darwin libc++ (dylibs + __config_site) - versions.bzl: add placeholder hashes for macOS sysroot and darwin libcxx - build_macos_sysroot.sh: script to package macOS SDK from Xcode - build_libcxx_darwin.sh: script to build darwin libc++ from LLVM source The macOS SDK sysroot provides system headers and .tbd library stubs. The darwin libcxx provides libc++ dylibs and the __config_site header needed by the LLVM toolchain for cross-compilation. When hashes are empty (tarballs not yet built/uploaded), the rules generate fallback content: the sysroot creates an empty directory, and libcxx_libs generates __config_site from the Linux LLVM version. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
Add a `build-macos-sysroot` job to the Bazel CI workflow that runs on `macos-14` and produces two artifacts: 1. `sysroot-macos-arm64.tar.xz` — macOS SDK sysroot extracted from the Xcode installation on the CI runner (headers, frameworks, .tbd stubs) 2. `libcxx-llvm18.1.8-darwin-aarch64.tar.xz` — libc++ built from LLVM source for darwin arm64 (dylibs + __config_site) These artifacts are needed for cross-compiling Envoy (and other C++ projects) from Linux x86_64 to macOS arm64. The Linux sysroots are built by debootstrap on Linux runners; the macOS sysroot requires a macOS runner with Xcode to extract Apple's SDK. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
- Fix shellcheck SC2295: quote expansions inside ${..} in sysroot scripts
- Fix shellcheck SC2034: remove unused ARCH variable in libcxx script
- Fix cmake error: add libunwind to LLVM_ENABLE_RUNTIMES and set
LIBCXXABI_USE_LLVM_UNWINDER=ON (required by libcxxabi)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
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Some frameworks (e.g., SystemConfiguration) have headers under Versions/A/Headers/ instead of just Headers/. Copy the full framework structure including versioned directories so clang can find all headers. Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
macOS `cp -a` requires the parent directory to exist. Create it with mkdir -p before copying Headers/Modules directories. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
Ruby.framework contains self-referencing symlinks (ruby -> .) that cause infinite recursion during Bazel's glob expansion. Remove these circular symlinks before packaging. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
Selectively copying Headers/Modules/tbd from frameworks breaks clang's framework header lookup, which depends on symlinks like: Headers -> Versions/Current/Headers Versions/Current -> A SDK frameworks contain only headers, modules, and .tbd stubs (no large binaries), so copying the entire directory is safe and correct. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Takeshi Yoneda <tyoneda@netflix.com>
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Add repository rules and build scripts for cross-compiling to macOS arm64 from Linux x86_64:
macos_sysrootrule andsetup_macos_sysroot()for macOS SDK sysroot (headers, frameworks, .tbd stubs)libcxx_libs_darwinrule andsetup_libcxx_libs_darwin()for darwin libc++ (dylibs + __config_site)The macOS SDK sysroot provides system headers and .tbd library stubs. The darwin libcxx provides libc++ dylibs and the __config_site header needed by the LLVM toolchain for cross-compilation.
When hashes are empty (tarballs not yet built/uploaded), the rules generate fallback content: the sysroot creates an empty directory, and libcxx_libs generates __config_site from the Linux LLVM version.