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macOS: pass explicit CMAKE_OSX_SYSROOT to the native configure - #362
On recent macOS versions, the CMake bundled in Setup.app fails to detect the SDK, leaving CMAKE_OSX_SYSROOT empty. Regular compile steps still work (clang falls back to the default SDK), but libpng's genout.cmake step only passes -isysroot when CMAKE_OSX_SYSROOT is set, so pnglibconf.out generation fails with:
fatal error: 'sys/types.h' file not found
Fix
Resolve the SDK path explicitly and pass it to the native configure step, so the build no longer depends on the bundled CMake's SDK detection. Also fails early with a clear message if the SDK cannot be resolved.
Testing
Confirmed on MacBook Pro M1 (macOS 27.0.1): the workaround (setting CMAKE_OSX_SYSROOT manually) completes the build successfully; this PR bakes the same fix into the build script.
Summary by CodeRabbit
Bug Fixes
macOS builds now locate the installed SDK automatically and use it during native configuration, helping avoid failures caused by an unresolved SDK path.
If the SDK cannot be resolved or its path is invalid, the build stops and displays a message to check the macOS development tools installation.
Fixespatchzyy#353
## Problem
On recent macOS versions, the CMake bundled in Setup.app fails to detect the SDK, leaving `CMAKE_OSX_SYSROOT` empty. Regular compile steps still work (clang falls back to the default SDK), but libpng's `genout.cmake` step only passes `-isysroot` when `CMAKE_OSX_SYSROOT` is set, so `pnglibconf.out` generation fails with:
```
fatal error: 'sys/types.h' file not found
```
## Fix
Resolve the SDK path explicitly and pass it to the native configure step, so the build no longer depends on the bundled CMake's SDK detection. Also fails early with a clear message if the SDK cannot be resolved.
## Testing
Confirmed on MacBook Pro M1 (macOS 27.0.1): the workaround (setting `CMAKE_OSX_SYSROOT` manually) completes the build successfully; this PR bakes the same fix into the build script.
No actionable comments were generated in the recent review.
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Launcher/local-build-macos.command
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Walkthrough
The macOS local build script resolves the SDK path with xcrun --show-sdk-path. It exits with an installation hint if resolution fails and passes the resolved path to CMake as CMAKE_OSX_SYSROOT.
Changes: macOS local build
Layer / File(s)
Summary
Resolve and configure the macOS SDK Launcher/local-build-macos.command
The script resolves the SDK path and exits with an Xcode Command Line Tools installation hint if resolution fails. The CMake configure command receives the path through CMAKE_OSX_SYSROOT; its other arguments remain unchanged.
No merge-blocking risk was identified in the macOS SDK configuration change.
Pre-merge checks: 5
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Description Check
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Title check
The title names the main change: the macOS build now passes an explicit CMAKE_OSX_SYSROOT to the native configure step. The raw summary confirms the script resolves the SDK with xcrun --show-sdk-path …
Linked Issues check
The change addresses issue #353 in Launcher/local-build-macos.command. It resolves the SDK with xcrun --show-sdk-path, verifies that the result is a directory, and fails with an actionable message…
Out of Scope Changes check
The whole-PR diff changes only Launcher/local-build-macos.command. SDK resolution, early failure handling, and the CMake sysroot argument directly support issue #353. No unrelated change is evident.
Docstring Coverage
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Full details: Title check
Explanation
The title names the main change: the macOS build now passes an explicit CMAKE_OSX_SYSROOT to the native configure step. The raw summary confirms the script resolves the SDK with xcrun --show-sdk-path and passes it through CMAKE_OSX_SYSROOT. The PR objectives describe the same fix for the libpng sys/types.h build failure. The title is specific, short, and matches the changeset.
Full details: Linked Issues check
Explanation
The change addresses issue #353 in Launcher/local-build-macos.command. It resolves the SDK with xcrun --show-sdk-path, verifies that the result is a directory, and fails with an actionable message when resolution fails. It passes the resolved path to native CMake through -DCMAKE_OSX_SYSROOT="$macos_sysroot". The change also preserves the existing Apple compiler selection. These changes directly address the reported sys/types.h failure during libpng generation.
Full details: Docstring Coverage
Explanation
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @Launcher/local-build-macos.command:
- Line 67: Separate the workspace normalization assignment from the macOS SDK
failure check with a newline or semicolon. Keep the `workspace=$(cd "$workspace"
&& pwd)` normalization reachable when `xcrun` succeeds so relative workspace
values resolve to an absolute path.
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Launcher/local-build-macos.command
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Fixes #353
Problem
On recent macOS versions, the CMake bundled in Setup.app fails to detect the SDK, leaving
CMAKE_OSX_SYSROOTempty. Regular compile steps still work (clang falls back to the default SDK), but libpng'sgenout.cmakestep only passes-isysrootwhenCMAKE_OSX_SYSROOTis set, sopnglibconf.outgeneration fails with:Fix
Resolve the SDK path explicitly and pass it to the native configure step, so the build no longer depends on the bundled CMake's SDK detection. Also fails early with a clear message if the SDK cannot be resolved.
Testing
Confirmed on MacBook Pro M1 (macOS 27.0.1): the workaround (setting
CMAKE_OSX_SYSROOTmanually) completes the build successfully; this PR bakes the same fix into the build script.Summary by CodeRabbit