Building with a skia renderer fails with a git error on Intel Mac

[mitioshi]

Building the Rust template project on Intel Mac with the following Cargo.toml

[dependencies]
slint = { version = "1.5.1", default-features = false, features = [
    "std",
    "renderer-skia",
    "backend-winit",
] }

[build-dependencies]
slint-build = "1.5.1"

I receive the following error:

  ...
  [1485/1490] compile ../../../../../../../../.cargo/registry/src/index.crates.io-6f17d22bba15001f/skia-bindings-0.71.0/skia/third_party/externals/icu/source/i18n/zonemeta.cpp
  [1486/1490] assemble gen/third_party/icu/icudtl_dat.S
  [1487/1490] link libicu.a
  [1488/1490] link libskunicode.a
  [1489/1490] link libskshaper.a
  [1490/1490] link libskparagraph.a
  cargo:rerun-if-changed=src/bindings.cpp
  cargo:rerun-if-changed=src/gl.cpp
  cargo:rerun-if-changed=src/metal.cpp
  cargo:rerun-if-changed=src/gpu.cpp
  cargo:rerun-if-changed=src/shaper.cpp
  cargo:rerun-if-changed=src/paragraph.cpp
  cargo:rerun-if-changed=/Users/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/skia-bindings-0.71.0/skia/include
  HOST: x86_64-apple-darwin
  cargo:rerun-if-env-changed=MACOSX_DEPLOYMENT_TARGET
  COMPILING BINDINGS: ["src/bindings.cpp", "src/gl.cpp", "src/metal.cpp", "src/gpu.cpp", "src/shaper.cpp", "src/paragraph.cpp"]
    DEFINES: NDEBUG= SK_ENABLE_PRECOMPILE= SK_ASSUME_GL=1 SK_GANESH= SK_DISABLE_TRACING= SK_USE_PERFETTO= SK_ENABLE_API_AVAILABLE= SK_GAMMA_APPLY_TO_A8= SK_ENABLE_AVX512_OPTS= SKIA_IMPLEMENTATION=1 SK_TYPEFACE_FACTORY_CORETEXT= SK_FONTMGR_CORETEXT_AVAILABLE= SK_GL= SK_METAL= SK_SUPPORT_PDF= SK_CODEC_DECODES_JPEG= SK_CODEC_DECODES_PNG= SK_HAS_WUFFS_LIBRARY= SK_XML= SKSHAPER_IMPLEMENTATION=1 SK_SHAPER_PRIMITIVE_AVAILABLE= SK_SHAPER_CORETEXT_AVAILABLE= SK_SHAPER_HARFBUZZ_AVAILABLE= SK_SHAPER_UNICODE_AVAILABLE= SK_UNICODE_AVAILABLE= SK_UNICODE_ICU_IMPLEMENTATION= SK_ENABLE_PARAGRAPH= SKUNICODE_IMPLEMENTATION=1 U_SHOW_CPLUSPLUS_API=0 U_USING_ICU_NAMESPACE=0 U_DISABLE_RENAMING= SK_USING_THIRD_PARTY_ICU= U_COMMON_IMPLEMENTATION= U_STATIC_IMPLEMENTATION= U_ENABLE_DYLOAD=0 U_I18N_IMPLEMENTATION= _XOPEN_SOURCE=0
    ARGS: -std=c++17 -fno-rtti -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
  cargo:warning=xcrun: error: unable to lookup item 'PlatformVersion' from command line tools installation
  cargo:warning=xcrun: error: unable to lookup item 'PlatformVersion' in SDK '/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'
  cargo:warning=macOS deployment target (10.7) too low, it will be increased
  cargo:warning=In file included from src/bindings.cpp:91:
  cargo:warning=/Users/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/skia-bindings-0.71.0/skia/include/effects/SkImageFilters.h:72:49: error: 'value' is unavailable: introduced in macOS 10.13
  cargo:warning=                   (!this->has_value() || this->value() == *o);
  cargo:warning=                                                ^
  cargo:warning=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/optional:992:33: note: 'value' has been explicitly marked unavailable here
  cargo:warning=    constexpr value_type const& value() const&
  cargo:warning=                                ^
  cargo:warning=1 error generated.

  --- stderr
  fatal: not a git repository (or any of the parent directories): .git


  error occurred: Command env -u IPHONEOS_DEPLOYMENT_TARGET "c++" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-gdwarf-2" "-fno-omit-frame-pointer" "-m64" "--target=x86_64-apple-darwin" "-mmacosx-version-min=10.7" "-I" "/Users/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/skia-bindings-0.71.0/skia" "-Wall" "-Wextra" "-std=c++17" "-fno-rtti" "-isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" "-DNDEBUG=" "-DSK_ENABLE_PRECOMPILE=" "-DSK_ASSUME_GL=1" "-DSK_GANESH=" "-DSK_DISABLE_TRACING=" "-DSK_USE_PERFETTO=" "-DSK_ENABLE_API_AVAILABLE=" "-DSK_GAMMA_APPLY_TO_A8=" "-DSK_ENABLE_AVX512_OPTS=" "-DSKIA_IMPLEMENTATION=1" "-DSK_TYPEFACE_FACTORY_CORETEXT=" "-DSK_FONTMGR_CORETEXT_AVAILABLE=" "-DSK_GL=" "-DSK_METAL=" "-DSK_SUPPORT_PDF=" "-DSK_CODEC_DECODES_JPEG=" "-DSK_CODEC_DECODES_PNG=" "-DSK_HAS_WUFFS_LIBRARY=" "-DSK_XML=" "-DSKSHAPER_IMPLEMENTATION=1" "-DSK_SHAPER_PRIMITIVE_AVAILABLE=" "-DSK_SHAPER_CORETEXT_AVAILABLE=" "-DSK_SHAPER_HARFBUZZ_AVAILABLE=" "-DSK_SHAPER_UNICODE_AVAILABLE=" "-DSK_UNICODE_AVAILABLE=" "-DSK_UNICODE_ICU_IMPLEMENTATION=" "-DSK_ENABLE_PARAGRAPH=" "-DSKUNICODE_IMPLEMENTATION=1" "-DU_SHOW_CPLUSPLUS_API=0" "-DU_USING_ICU_NAMESPACE=0" "-DU_DISABLE_RENAMING=" "-DSK_USING_THIRD_PARTY_ICU=" "-DU_COMMON_IMPLEMENTATION=" "-DU_STATIC_IMPLEMENTATION=" "-DU_ENABLE_DYLOAD=0" "-DU_I18N_IMPLEMENTATION=" "-D_XOPEN_SOURCE=0" "-o" "/Users/user/src/my-project/target/debug/build/skia-bindings-5e2d6c7d07d6df8a/out/skia/2e40c9e35e9506f4-bindings.o" "-c" "src/bindings.cpp" with args c++ did not execute successfully (status code exit status: 1).

Skia is apparently being built here due to the relevant prebuilt binary not being available in skia-binaries

[tronical]

Could you describe your build environment a little? It looks like there's an issue with the Xcode installation. Note the following two error messages from your log:

xcrun: error: unable to lookup item 'PlatformVersion' from command line tools installation
xcrun: error: unable to lookup item 'PlatformVersion' in SDK '/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'

What does xcrun --show-sdk-path --sdk macosx show for you? Does the directory it prints exist and have an SDK installed?

Perhaps you may want to switch to the default SDK using sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer ?

[mitioshi]

@tronical Running xcrun --show-sdk-path --sdk macosx outputs /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk. It does have an sdk installed.
As for ninja, I installed it from homebrew

[tronical]

Thanks for the quick response. Could you also try running xcrun --show-sdk-platform-version?

[mitioshi]

@tronical Sure. Here's what it prints

▶ xcrun --show-sdk-platform-version
xcrun: error: unable to lookup item 'PlatformVersion' from command line tools installation
xcrun: error: unable to lookup item 'PlatformVersion' in SDK '/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'

[tronical]

Ok, and that's the source of the build issue you're seeing. This command should not produce the error but print a version. It looks like the macOS SDK installed in /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk on your machine is incomplete somehow (or corrupted).

[tronical]

Could you run ls -ld /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk? I wonder what your MacOSX.sdk symlink points to. It looks like 10.7 maybe? Do you have an explicit macOS deployment target configured?

[mitioshi]

Do you have an explicit macOS deployment target configured?

I don't. Here's where the symlink points:

▶ ls -ld /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
lrwxr-xr-x  1 root  wheel  14 Feb  7 12:46 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -> MacOSX14.2.sdk
▶ realpath /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
/Library/Developer/CommandLineTools/SDKs/MacOSX14.2.sdk

[tronical]

Thanks. I can reproduce this. It seems that xcrun --show-sdk-path --sdk macosx is not supported with the command line tools alone (see also rust-lang/cc-rs#1001). If you run sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer the issue should be resolved and the build should work.

I'll add this to the known issues docs for the Skia renderer build.