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https://github.com/Kitware/CMake.git
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bf1bb62e74
In commit 7b19531291 (macOS: Do not pass any SDK/-isysroot to compilers
by default, 2024-11-06, v4.0.0-rc1~511^2) we broke support for using
upstream LLVM/Clang to build for macOS because the compiler has no
default sysroot. Handle empty `CMAKE_OSX_SYSROOT` with LLVM/Clang by
falling back to the macOS SDK reported by `xcrun --show-sdk-path` .
Fixes: #26863
48 lines
1.4 KiB
CMake
48 lines
1.4 KiB
CMake
include(RunCMake)
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# Isolate from caller's environment.
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unset(ENV{CMAKE_OSX_ARCHITECTURES})
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unset(ENV{CMAKE_OSX_DEPLOYMENT_TARGET})
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unset(ENV{SDKROOT})
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function(run_xcode_cc)
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set(RunCMake_TEST_VARIANT_DESCRIPTION "-xcode")
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if(EXISTS "/usr/include/AvailabilityMacros.h")
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run_cmake(SDK)
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else()
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run_cmake(NoSDK)
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endif()
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endfunction()
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if(RunCMake_GENERATOR STREQUAL "Xcode")
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run_xcode_cc()
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else()
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set(system_cc "/usr/bin/cc")
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set(system_cxx "/usr/bin/c++")
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if(EXISTS "${system_cc}" AND EXISTS "${system_cxx}")
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set(ENV{CC} "${system_cc}")
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set(ENV{CXX} "${system_cxx}")
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set(ENV{OBJC} "${system_cc}")
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set(ENV{OBJCXX} "${system_cxx}")
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set(RunCMake_TEST_VARIANT_DESCRIPTION "-system")
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run_cmake(SDK)
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endif()
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execute_process(COMMAND xcrun --find cc OUTPUT_VARIABLE xcode_cc OUTPUT_STRIP_TRAILING_WHITESPACE)
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execute_process(COMMAND xcrun --find c++ OUTPUT_VARIABLE xcode_cxx OUTPUT_STRIP_TRAILING_WHITESPACE)
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execute_process(COMMAND xcrun --show-sdk-path OUTPUT_VARIABLE xcode_sdk OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(EXISTS "${xcode_cc}" AND EXISTS "${xcode_cxx}")
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set(ENV{CC} "${xcode_cc}")
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set(ENV{CXX} "${xcode_cxx}")
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set(ENV{OBJC} "${xcode_cc}")
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set(ENV{OBJCXX} "${xcode_cxx}")
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run_xcode_cc()
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if(EXISTS "${xcode_sdk}")
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set(RunCMake_TEST_VARIANT_DESCRIPTION "-xcode-SDKROOT")
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set(ENV{SDKROOT} "${xcode_sdk}")
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run_cmake(SDK)
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unset(ENV{SDKROOT})
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endif()
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endif()
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endif()
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