1 # Based on the Qt 5 processor detection code, so should be very accurate 2 # https://qt.gitorious.org/qt/qtbase/blobs/master/src/corelib/global/qprocessordetection.h 3 # Currently handles arm (v5, v6, v7), x86 (32/64), ia64, and ppc (32/64) 4 5 # Regarding POWER/PowerPC, just as is noted in the Qt source, 6 # "There are many more known variants/revisions that we do not handle/detect." 7 8 set(archdetect_c_code " 9 #if defined(__arm__) || defined(__TARGET_ARCH_ARM) 10 #if defined(__ARM_ARCH_7__) \\ 11 || defined(__ARM_ARCH_7A__) \\ 12 || defined(__ARM_ARCH_7R__) \\ 13 || defined(__ARM_ARCH_7M__) \\ 14 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 7) 15 #error cmake_ARCH armv7 16 #elif defined(__ARM_ARCH_6__) \\ 17 || defined(__ARM_ARCH_6J__) \\ 18 || defined(__ARM_ARCH_6T2__) \\ 19 || defined(__ARM_ARCH_6Z__) \\ 20 || defined(__ARM_ARCH_6K__) \\ 21 || defined(__ARM_ARCH_6ZK__) \\ 22 || defined(__ARM_ARCH_6M__) \\ 23 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 6) 24 #error cmake_ARCH armv6 25 #elif defined(__ARM_ARCH_5TEJ__) \\ 26 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 5) 27 #error cmake_ARCH armv5 28 #else 29 #error cmake_ARCH arm 30 #endif 31 #elif defined(__i586) || defined(__i586__) 32 #error cmake_ARCH i586 33 #elif defined(__i386) || defined(__i386__) || defined(_M_IX86) 34 #error cmake_ARCH i386 35 #elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64) 36 #error cmake_ARCH x86_64 37 #elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64) 38 #error cmake_ARCH ia64 39 #elif defined(__ppc__) || defined(__ppc) || defined(__powerpc__) \\ 40 || defined(_ARCH_COM) || defined(_ARCH_PWR) || defined(_ARCH_PPC) \\ 41 || defined(_M_MPPC) || defined(_M_PPC) 42 #if defined(__ppc64__) || defined(__powerpc64__) || defined(__64BIT__) 43 #error cmake_ARCH ppc64 44 #else 45 #error cmake_ARCH ppc 46 #endif 47 #endif 48 49 #error cmake_ARCH unknown 50 ") 51 52 # Set ppc_support to TRUE before including this file or ppc and ppc64 53 # will be treated as invalid architectures since they are no longer supported by Apple 54 55 function(target_architecture output_var) 56 if(APPLE AND CMAKE_OSX_ARCHITECTURES) 57 # On OS X we use CMAKE_OSX_ARCHITECTURES *if* it was set 58 # First let's normalize the order of the values 59 60 # Note that it's not possible to compile PowerPC applications if you are using 61 # the OS X SDK version 10.6 or later - you'll need 10.4/10.5 for that, so we 62 # disable it by default 63 # See this page for more information: 64 # http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4 65 66 # Architecture defaults to i386 or ppc on OS X 10.5 and earlier, depending on the CPU type detected at runtime. 67 # On OS X 10.6+ the default is x86_64 if the CPU supports it, i386 otherwise. 68 69 foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES}) 70 if("${osx_arch}" STREQUAL "ppc" AND ppc_support) 71 set(osx_arch_ppc TRUE) 72 elseif("${osx_arch}" STREQUAL "i386") 73 set(osx_arch_i386 TRUE) 74 elseif("${osx_arch}" STREQUAL "x86_64") 75 set(osx_arch_x86_64 TRUE) 76 elseif("${osx_arch}" STREQUAL "ppc64" AND ppc_support) 77 set(osx_arch_ppc64 TRUE) 78 else() 79 message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}") 80 endif() 81 endforeach() 82 83 # Now add all the architectures in our normalized order 84 if(osx_arch_ppc) 85 list(APPEND ARCH ppc) 86 endif() 87 88 if(osx_arch_i386) 89 list(APPEND ARCH i386) 90 endif() 91 92 if(osx_arch_x86_64) 93 list(APPEND ARCH x86_64) 94 endif() 95 96 if(osx_arch_ppc64) 97 list(APPEND ARCH ppc64) 98 endif() 99 else() 100 file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}") 101 102 enable_language(C) 103 104 # Detect the architecture in a rather creative way... 105 # This compiles a small C program which is a series of ifdefs that selects a 106 # particular #error preprocessor directive whose message string contains the 107 # target architecture. The program will always fail to compile (both because 108 # file is not a valid C program, and obviously because of the presence of the 109 # #error preprocessor directives... but by exploiting the preprocessor in this 110 # way, we can detect the correct target architecture even when cross-compiling, 111 # since the program itself never needs to be run (only the compiler/preprocessor) 112 try_run( 113 run_result_unused 114 compile_result_unused 115 "${CMAKE_BINARY_DIR}" 116 "${CMAKE_BINARY_DIR}/arch.c" 117 COMPILE_OUTPUT_VARIABLE ARCH 118 CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES} 119 ) 120 121 # Parse the architecture name from the compiler output 122 string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}") 123 124 # Get rid of the value marker leaving just the architecture name 125 string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}") 126 127 # If we are compiling with an unknown architecture this variable should 128 # already be set to "unknown" but in the case that it's empty (i.e. due 129 # to a typo in the code), then set it to unknown 130 if (NOT ARCH) 131 set(ARCH unknown) 132 endif() 133 endif() 134 135 set(${output_var} "${ARCH}" PARENT_SCOPE) 136 endfunction() 137
