e2251a0e8b
Also removed i386 as valid architecture for macOS, as it's no longer supported (even x86_64 is currently being phased out in favor of Silicon-based Macs). ARM64 would also be required for a potential Raspberry Pi port (also needs a Vulkan or OpenGL ES renderer).
106 lines
4.2 KiB
CMake
106 lines
4.2 KiB
CMake
# Based on the Qt 5 processor detection code, so should be very accurate
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# https://qt.gitorious.org/qt/qtbase/blobs/master/src/corelib/global/qprocessordetection.h
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# Currently handles arm (v5, v6, v7), x86 (32/64), ia64, and ppc (32/64)
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# Regarding POWER/PowerPC, just as is noted in the Qt source,
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# "There are many more known variants/revisions that we do not handle/detect."
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set(archdetect_c_code "
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#if defined(__arm__) || defined(__TARGET_ARCH_ARM)
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#if defined(__ARM_ARCH_7__) \\
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|| defined(__ARM_ARCH_7A__) \\
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|| defined(__ARM_ARCH_7R__) \\
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|| defined(__ARM_ARCH_7M__) \\
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|| (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 7)
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#error cmake_ARCH armv7
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#elif defined(__ARM_ARCH_6__) \\
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|| defined(__ARM_ARCH_6J__) \\
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|| defined(__ARM_ARCH_6T2__) \\
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|| defined(__ARM_ARCH_6Z__) \\
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|| defined(__ARM_ARCH_6K__) \\
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|| defined(__ARM_ARCH_6ZK__) \\
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|| defined(__ARM_ARCH_6M__) \\
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|| (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 6)
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#error cmake_ARCH armv6
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#elif defined(__ARM_ARCH_5TEJ__) \\
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|| (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 5)
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#error cmake_ARCH armv5
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#else
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#error cmake_ARCH arm
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#endif
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#elif defined(__arm64__)
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#error cmake_ARCH arm64
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#elif defined(__i386) || defined(__i386__) || defined(_M_IX86)
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#error cmake_ARCH i386
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#elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64)
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#error cmake_ARCH x86_64
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#elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64)
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#error cmake_ARCH ia64
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#endif
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#error cmake_ARCH unknown
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")
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function(target_architecture output_var)
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if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND CMAKE_OSX_ARCHITECTURES)
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# On macOS, we use CMAKE_OSX_ARCHITECTURES *if* it was set
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# Apple currently only supports x86_64 and arm64 architectures to target Intel-based
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# and Silicon-based Macs. Building as a universal binary will make each machine
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# use the proper native code to run the resulting executable.
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foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES})
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if("${osx_arch}" STREQUAL "x86_64")
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set(osx_arch_x86_64 TRUE)
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elseif("${osx_arch}" STREQUAL "arm64")
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set(osx_arch_arm64 TRUE)
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else()
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message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}")
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endif()
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endforeach()
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if(osx_arch_x86_64)
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list(APPEND ARCH x86_64)
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endif()
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if(osx_arch_arm64)
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list(APPEND ARCH arm64)
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endif()
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else()
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file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}")
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enable_language(C)
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# Detect the architecture in a rather creative way...
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# This compiles a small C program which is a series of ifdefs that selects a
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# particular #error preprocessor directive whose message string contains the
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# target architecture. The program will always fail to compile (both because
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# file is not a valid C program, and obviously because of the presence of the
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# #error preprocessor directives... but by exploiting the preprocessor in this
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# way, we can detect the correct target architecture even when cross-compiling,
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# since the program itself never needs to be run (only the compiler/preprocessor)
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try_run(
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run_result_unused
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compile_result_unused
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"${CMAKE_BINARY_DIR}"
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"${CMAKE_BINARY_DIR}/arch.c"
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COMPILE_OUTPUT_VARIABLE ARCH
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CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}
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)
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# Parse the architecture name from the compiler output
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string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}")
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# Get rid of the value marker leaving just the architecture name
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string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}")
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# If we are compiling with an unknown architecture this variable should
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# already be set to "unknown" but in the case that it's empty (i.e. due
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# to a typo in the code), then set it to unknown
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if (NOT ARCH)
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set(ARCH unknown)
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endif()
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endif()
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set(${output_var} "${ARCH}" PARENT_SCOPE)
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endfunction()
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