Draft: Attempt at Mac OS compilation #184
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motiejus@mtwork:/code/bazel-zig-cc$ bazel build --spawn_strategy=local --platforms @zig_sdk//libc_aware/platform:macos_aarch64_sdk.13.1 test/c:which_libc
INFO: Analyzed target //test/c:which_libc (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //test/c:which_libc up-to-date:
bazel-bin/test/c/which_libc
INFO: Elapsed time: 0.071s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
motiejus@mtwork:/code/bazel-zig-cc$ file bazel-bin/test/c/which_libc
bazel-bin/test/c/which_libc: Mach-O 64-bit arm64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>
motiejus@mtwork:/code/bazel-zig-cc$
But need to go back to see what hacks I added
bazel build --spawn_strategy=local --platforms @zig_sdk//libc_aware/platform:macos_aarch64_sdk.14.2 test/c:which_libc --sandbox_debug -s INFO: Build completed successfully, 4 total actions
chrisirhc
commented
Jun 16, 2024
toolchain/private/defs.bzl
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| "external/hermetic_cc_toolchain~~toolchains~macos_sdk_{}".format(macos_sdk_version), | ||
| "-F", | ||
| "external/hermetic_cc_toolchain~~toolchains~macos_sdk_{}/Frameworks".format(macos_sdk_version), | ||
| "-L", | ||
| "external/hermetic_cc_toolchain~~toolchains~macos_sdk_{}/lib".format(macos_sdk_version), |
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I'm not sure why external/macos_sdk_… path doesn't work. Is it how the repository was defined? I'm not sure if this is idiomatic bazel to depend on an external path with ~s, I'd imagine these are 'non-public' paths.
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These are bzlmod canonical repo paths, which are not guaranteed to be deterministic. You'll want to instead resolve them with some combination of Label and repository_ctx.path
chrisirhc
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Jun 16, 2024
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| // HACK: if OS is macos, then force the ABI triple to "none". | ||
| if (!mem.eql(u8, got_os, "macos")) | ||
| return RunMode{ .cc = triple }; | ||
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| if (mem.eql(u8, got_arch, "aarch64")) | ||
| return RunMode{ .cc = "aarch64-macos-none" }; | ||
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| if (mem.eql(u8, got_arch, "x86_64")) | ||
| return RunMode{ .cc = "x86_64-macos-none"}; | ||
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I think these hacks are to get macos-arm64-sdk.14.2 to be recognized by zig with an expected target ABI.
toolchain/private/defs.bzl
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| "libc/darwin", | ||
| "libc/include/any-macos-any", | ||
| "libc/include/any-macos-any", | ||
| ] + _INCLUDE_TAIL, | ||
| linkopts = ["-Wl,-headerpad_max_install_names"], | ||
| linkopts = macos_sdk_opts, | ||
| dynamic_library_linkopts = ["-Wl,-undefined=dynamic_lookup"], | ||
| supports_dynamic_linker = True, | ||
| cxx_builtin_include_directories = [ | ||
| "external/hermetic_cc_toolchain~~toolchains~macos_sdk_{}/include".format(macos_sdk_version) | ||
| ], | ||
| sdk_include_files = [ | ||
| "@macos_sdk_{}//:Frameworks".format(macos_sdk_version), | ||
| # "@macos_sdk_{}//:usr_include".format(macos_sdk_version), | ||
| ], | ||
| sdk_lib_files = ["@macos_sdk_{}//:usr_lib".format(macos_sdk_version)], |
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I found these by trial and error and compiling against a target that expects Mac OS SDK ( the example in #10 (comment) )
fatal error: 'CFNetwork/CFProxySupport.h' file not found
hit error: unsupported linker arg: -no_pie
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@chrisirhc nice work so far! Happy to help test this when ready. |
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Realized that hexops is an incomplete sysroot, so I went with unpacking a pkg. I believe it's the issue reported in ziglang/zig#20243 But I guess this is progress. |
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Attempt to get a working macos branch.
This is a continuation of the work in https://github.com/motiejus/hermetic_cc_toolchain/tree/macos .
NOTE: I have no idea what I'm doing. I'm piecing together the previous threads about sysroot from the readme.
I have no idea what the zig or gcc options mean.
There are a number of hacks in this branch, so this is still WIP.
TODOs:
Fixes #10