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 # This file is under the terms of the GNU Lesser General Public License version 6 # 2.1 as published by the Free Software Foundation and appearing in the file 7 # LICENSE.LGPL included in the packaging of this file. Please review the 8 # following information to ensure the GNU Lesser General Public License version 9 # 2.1 requirements will be met: 10 # http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 11 12 # Regarding POWER/PowerPC, just as is noted in the Qt source, 13 # "There are many more known variants/revisions that we do not handle/detect." 14 15 set(archdetect_c_code " 16 #if defined(__aarch64__) 17 #error cmake_ARCH armv8 18 #elif defined(__arm__) || defined(__TARGET_ARCH_ARM) 19 #if defined(__ARM_ARCH_7__) \\ 20 || defined(__ARM_ARCH_7A__) \\ 21 || defined(__ARM_ARCH_7R__) \\ 22 || defined(__ARM_ARCH_7M__) \\ 23 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 7) 24 #error cmake_ARCH armv7 25 #elif defined(__ARM_ARCH_6__) \\ 26 || defined(__ARM_ARCH_6J__) \\ 27 || defined(__ARM_ARCH_6T2__) \\ 28 || defined(__ARM_ARCH_6Z__) \\ 29 || defined(__ARM_ARCH_6K__) \\ 30 || defined(__ARM_ARCH_6ZK__) \\ 31 || defined(__ARM_ARCH_6M__) \\ 32 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 6) 33 #error cmake_ARCH armv6 34 #elif defined(__ARM_ARCH_5TEJ__) \\ 35 || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 5) 36 #error cmake_ARCH armv5 37 #else 38 #error cmake_ARCH arm 39 #endif 40 #elif defined(__i586) || defined(__i586__) 41 #error cmake_ARCH i586 42 #elif defined(__i386) || defined(__i386__) || defined(_M_IX86) 43 #error cmake_ARCH i386 44 #elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64) 45 #error cmake_ARCH x86_64 46 #elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64) 47 #error cmake_ARCH ia64 48 #elif defined(__ppc__) || defined(__ppc) || defined(__powerpc__) \\ 49 || defined(_ARCH_COM) || defined(_ARCH_PWR) || defined(_ARCH_PPC) \\ 50 || defined(_M_MPPC) || defined(_M_PPC) 51 #if defined(__ppc64__) || defined(__powerpc64__) || defined(__64BIT__) 52 #error cmake_ARCH ppc64 53 #else 54 #error cmake_ARCH ppc 55 #endif 56 #endif 57 58 #error cmake_ARCH unknown 59 ") 60 61 # Set ppc_support to TRUE before including this file or ppc and ppc64 62 # will be treated as invalid architectures since they are no longer supported by Apple 63 64 function(target_architecture output_var) 65 if(APPLE AND CMAKE_OSX_ARCHITECTURES) 66 # On OS X we use CMAKE_OSX_ARCHITECTURES *if* it was set 67 # First let's normalize the order of the values 68 69 # Note that it's not possible to compile PowerPC applications if you are using 70 # the OS X SDK version 10.6 or later - you'll need 10.4/10.5 for that, so we 71 # disable it by default 72 # See this page for more information: 73 # http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4 74 75 # Architecture defaults to i386 or ppc on OS X 10.5 and earlier, depending on the CPU type detected at runtime. 76 # On OS X 10.6+ the default is x86_64 if the CPU supports it, i386 otherwise. 77 78 foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES}) 79 if("${osx_arch}" STREQUAL "ppc" AND ppc_support) 80 set(osx_arch_ppc TRUE) 81 elseif("${osx_arch}" STREQUAL "i386") 82 set(osx_arch_i386 TRUE) 83 elseif("${osx_arch}" STREQUAL "x86_64") 84 set(osx_arch_x86_64 TRUE) 85 elseif("${osx_arch}" STREQUAL "ppc64" AND ppc_support) 86 set(osx_arch_ppc64 TRUE) 87 else() 88 message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}") 89 endif() 90 endforeach() 91 92 # Now add all the architectures in our normalized order 93 if(osx_arch_ppc) 94 list(APPEND ARCH ppc) 95 endif() 96 97 if(osx_arch_i386) 98 list(APPEND ARCH i386) 99 endif() 100 101 if(osx_arch_x86_64) 102 list(APPEND ARCH x86_64) 103 endif() 104 105 if(osx_arch_ppc64) 106 list(APPEND ARCH ppc64) 107 endif() 108 else() 109 file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}") 110 111 enable_language(C) 112 113 # Detect the architecture in a rather creative way... 114 # This compiles a small C program which is a series of ifdefs that selects a 115 # particular #error preprocessor directive whose message string contains the 116 # target architecture. The program will always fail to compile (both because 117 # file is not a valid C program, and obviously because of the presence of the 118 # #error preprocessor directives... but by exploiting the preprocessor in this 119 # way, we can detect the correct target architecture even when cross-compiling, 120 # since the program itself never needs to be run (only the compiler/preprocessor) 121 try_run( 122 run_result_unused 123 compile_result_unused 124 "${CMAKE_BINARY_DIR}" 125 "${CMAKE_BINARY_DIR}/arch.c" 126 COMPILE_OUTPUT_VARIABLE ARCH 127 CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES} 128 ) 129 130 # Parse the architecture name from the compiler output 131 string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}") 132 133 # Get rid of the value marker leaving just the architecture name 134 string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}") 135 136 # If we are compiling with an unknown architecture this variable should 137 # already be set to "unknown" but in the case that it's empty (i.e. due 138 # to a typo in the code), then set it to unknown 139 if (NOT ARCH) 140 set(ARCH unknown) 141 endif() 142 endif() 143 144 set(${output_var} "${ARCH}" PARENT_SCOPE) 145 endfunction() 146
