build: take the SDK from the selected developer dir, not the host OS - #26
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`xcrun --show-sdk-path` without --sdk looks for an SDK matching the host OS and falls through to CommandLineTools when the selected Xcode has none. On a macOS 27 host with Xcode 26.6 that picked the CLT 27.0 SDK (built for Swift 6.4), and Xcode's swiftc 6.3 rejected it: "this SDK is not supported by the compiler". Ask for `--sdk macosx` so the SDK and swiftc come from the same xcode-select'ed developer dir; SDKROOT still overrides. The output matches v0.4.0-rc1: minos 14.0, sdk 26.5, same linked dylibs. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Summary
build.shresolved the SDK withxcrun --show-sdk-path. Without--sdk, xcrun looks for an SDK matching the host OS and falls through to CommandLineTools when the selected Xcode lacks one.this SDK is not supported by the compiler.release.sh→package.sh→build.shcould not produce 0.4.0.xcrun --sdk macosx --show-sdk-path, so the SDK andswiftccome from the samexcode-selected developer dir.SDKROOTstill overrides. The chosen SDK is printed in the build log.Verification
env -u SDKROOT ./scripts/build.sh aarch64-apple-darwinsucceeds and selectsMacOSX26.5.sdkfrom Xcode.v0.4.0-rc1:LC_BUILD_VERSIONminos 14.0 / sdk 26.5 on both slices, identical linked-dylib list.shellcheck -S warningclean.🤖 Generated with Claude Code