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mahgemahge
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[cmake] Add a target arch related info file.
 - This is taken from https://github.com/axr/solar-cmake/blob/master/TargetArch.cmake It seems to be a good way to detect the arch of the target we are compiling for. I will move more arch related variables here later. They are right now scattered around in the CMake files.
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‎OMCompiler/.cmake/omc_target_info.cmake‎

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## Taken from https://github.com/axr/solar-cmake/blob/master/TargetArch.cmake with love.
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## Modified to define OMC_TARGET_ARCH here. Very minor change.
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##
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## Hopefully can detect arch properly.
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# 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(__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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#elif defined(__ppc__) || defined(__ppc) || defined(__powerpc__) \\
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|| defined(_ARCH_COM) || defined(_ARCH_PWR) || defined(_ARCH_PPC) \\
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|| defined(_M_MPPC) || defined(_M_PPC)
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#if defined(__ppc64__) || defined(__powerpc64__) || defined(__64BIT__)
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#error cmake_ARCH ppc64
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#else
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#error cmake_ARCH ppc
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#endif
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#endif
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#error cmake_ARCH unknown
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")
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# Set ppc_support to TRUE before including this file or ppc and ppc64
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# will be treated as invalid architectures since they are no longer supported by Apple
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function(target_architecture output_var)
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if(APPLE AND CMAKE_OSX_ARCHITECTURES)
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# On OS X we use CMAKE_OSX_ARCHITECTURES *if* it was set
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# First let's normalize the order of the values
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# Note that it's not possible to compile PowerPC applications if you are using
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# the OS X SDK version 10.6 or later - you'll need 10.4/10.5 for that, so we
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# disable it by default
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# See this page for more information:
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# http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4
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# Architecture defaults to i386 or ppc on OS X 10.5 and earlier, depending on the CPU type detected at runtime.
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# On OS X 10.6+ the default is x86_64 if the CPU supports it, i386 otherwise.
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foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES})
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if("${osx_arch}" STREQUAL "ppc" AND ppc_support)
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set(osx_arch_ppc TRUE)
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elseif("${osx_arch}" STREQUAL "i386")
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set(osx_arch_i386 TRUE)
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elseif("${osx_arch}" STREQUAL "x86_64")
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set(osx_arch_x86_64 TRUE)
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elseif("${osx_arch}" STREQUAL "ppc64" AND ppc_support)
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set(osx_arch_ppc64 TRUE)
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else()
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message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}")
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endif()
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endforeach()
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# Now add all the architectures in our normalized order
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if(osx_arch_ppc)
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list(APPEND ARCH ppc)
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endif()
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if(osx_arch_i386)
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list(APPEND ARCH i386)
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endif()
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if(osx_arch_x86_64)
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list(APPEND ARCH x86_64)
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endif()
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if(osx_arch_ppc64)
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list(APPEND ARCH ppc64)
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endif()
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else()
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file(WRITE "${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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# Use the function to set OMC_TARGET_ARCH
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target_architecture(OMC_TARGET_ARCH)
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omc_add_to_report(OMC_TARGET_ARCH)

‎OMCompiler/CMakeLists.txt‎

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# include utility macros.
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include(.cmake/omc_utils.cmake)
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include(.cmake/omc_target_info.cmake)
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include(.cmake/omc_check_exists.cmake)
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# Add the compiler ids to the report for convenience.

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