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)
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.
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."
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
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
58 #error cmake_ARCH unknown
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
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
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
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.
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)
88 message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}")
92 # Now add all the architectures in our normalized order
98 list(APPEND ARCH i386)
102 list(APPEND ARCH x86_64)
106 list(APPEND ARCH ppc64)
109 file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}")
113 # Detect the architecture in a rather creative way...
114 # This compiles a small C program which is a series of ifdefs that selects a
115 # particular #error preprocessor directive whose message string contains the
116 # target architecture. The program will always fail to compile (both because
117 # file is not a valid C program, and obviously because of the presence of the
118 # #error preprocessor directives... but by exploiting the preprocessor in this
119 # way, we can detect the correct target architecture even when cross-compiling,
120 # since the program itself never needs to be run (only the compiler/preprocessor)
123 compile_result_unused
124 "${CMAKE_BINARY_DIR}"
125 "${CMAKE_BINARY_DIR}/arch.c"
126 COMPILE_OUTPUT_VARIABLE ARCH
127 CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}
130 # Parse the architecture name from the compiler output
131 string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}")
133 # Get rid of the value marker leaving just the architecture name
134 string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}")
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
144 set(${output_var} "${ARCH}" PARENT_SCOPE)