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Darwin lacks copy_file_range() and O_LARGEFILE, so the gen_init_cpio host program fails to build and a macOS build of vmlinux.wasm stops in usr/. Force-include a small compat header for that host program on Darwin only: copy_file_range() becomes a read/write loop with the same return contract, and O_LARGEFILE is 0 (off_t is already 64-bit there). Other hosts are unchanged. Tested on macOS 26 (Apple Silicon) with GNU Make 4.4.1 and Homebrew LLVM 19.1.7 (matching flake.nix): defconfig + vmlinux.wasm builds on top of f2a512c, which no longer needs scripts/mod. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Now that #56 skips
scripts/modfor wasm-ld, one host tool still stops a macOS build ofvmlinux.wasm:usr/gen_init_cpio. Darwin has neithercopy_file_range()norO_LARGEFILE:On Darwin only,
usr/Makefilenow force-includes a small compat header (arch/wasm/scripts/macos-host-compat.h) for that one host program:copy_file_range()becomes a read/write loop with the same return contract;O_LARGEFILEis defined as 0, sinceoff_tis already 64-bit on Darwin.There are no target code changes, and builds on other hosts are unchanged.
Tested on macOS 26 (Apple Silicon) with GNU Make 4.4.1 (Homebrew
make) and Homebrew LLVM 19.1.7, the same major version asllvmPackages_19inflake.nix. On top of f2a512c,make mrproper && make defconfig && make vmlinux.wasmsucceeds. Without this change the same build fails with the errors above.(This PR originally also skipped
scripts/modon Darwin; #56 covers that for every host, so I dropped that part.)🤖 Generated with Claude Code