diff options
Diffstat (limited to 'cmake/TargetArch.cmake')
| -rw-r--r-- | cmake/TargetArch.cmake | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/cmake/TargetArch.cmake b/cmake/TargetArch.cmake new file mode 100644 index 0000000..3761e4d --- /dev/null +++ b/cmake/TargetArch.cmake @@ -0,0 +1,134 @@ +# Based on the Qt 5 processor detection code, so should be very accurate +# https://qt.gitorious.org/qt/qtbase/blobs/master/src/corelib/global/qprocessordetection.h +# Currently handles arm (v5, v6, v7), x86 (32/64), ia64, and ppc (32/64) + +# Regarding POWER/PowerPC, just as is noted in the Qt source, +# "There are many more known variants/revisions that we do not handle/detect." + +set(archdetect_c_code " +#if defined(__arm__) || defined(__TARGET_ARCH_ARM) + #if defined(__ARM_ARCH_7__) \\ + || defined(__ARM_ARCH_7A__) \\ + || defined(__ARM_ARCH_7R__) \\ + || defined(__ARM_ARCH_7M__) \\ + || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 7) + #error cmake_ARCH armv7 + #elif defined(__ARM_ARCH_6__) \\ + || defined(__ARM_ARCH_6J__) \\ + || defined(__ARM_ARCH_6T2__) \\ + || defined(__ARM_ARCH_6Z__) \\ + || defined(__ARM_ARCH_6K__) \\ + || defined(__ARM_ARCH_6ZK__) \\ + || defined(__ARM_ARCH_6M__) \\ + || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 6) + #error cmake_ARCH armv6 + #elif defined(__ARM_ARCH_5TEJ__) \\ + || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 5) + #error cmake_ARCH armv5 + #else + #error cmake_ARCH arm + #endif +#elif defined(__i386) || defined(__i386__) || defined(_M_IX86) + #error cmake_ARCH i386 +#elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64) + #error cmake_ARCH x86_64 +#elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64) + #error cmake_ARCH ia64 +#elif defined(__ppc__) || defined(__ppc) || defined(__powerpc__) \\ + || defined(_ARCH_COM) || defined(_ARCH_PWR) || defined(_ARCH_PPC) \\ + || defined(_M_MPPC) || defined(_M_PPC) + #if defined(__ppc64__) || defined(__powerpc64__) || defined(__64BIT__) + #error cmake_ARCH ppc64 + #else + #error cmake_ARCH ppc + #endif +#endif + +#error cmake_ARCH unknown +") + +# Set ppc_support to TRUE before including this file or ppc and ppc64 +# will be treated as invalid architectures since they are no longer supported by Apple + +function(target_architecture output_var) + if(APPLE AND CMAKE_OSX_ARCHITECTURES) + # On OS X we use CMAKE_OSX_ARCHITECTURES *if* it was set + # First let's normalize the order of the values + + # Note that it's not possible to compile PowerPC applications if you are using + # the OS X SDK version 10.6 or later - you'll need 10.4/10.5 for that, so we + # disable it by default + # See this page for more information: + # http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4 + + # Architecture defaults to i386 or ppc on OS X 10.5 and earlier, depending on the CPU type detected at runtime. + # On OS X 10.6+ the default is x86_64 if the CPU supports it, i386 otherwise. + + foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES}) + if("${osx_arch}" STREQUAL "ppc" AND ppc_support) + set(osx_arch_ppc TRUE) + elseif("${osx_arch}" STREQUAL "i386") + set(osx_arch_i386 TRUE) + elseif("${osx_arch}" STREQUAL "x86_64") + set(osx_arch_x86_64 TRUE) + elseif("${osx_arch}" STREQUAL "ppc64" AND ppc_support) + set(osx_arch_ppc64 TRUE) + else() + message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}") + endif() + endforeach() + + # Now add all the architectures in our normalized order + if(osx_arch_ppc) + list(APPEND ARCH ppc) + endif() + + if(osx_arch_i386) + list(APPEND ARCH i386) + endif() + + if(osx_arch_x86_64) + list(APPEND ARCH x86_64) + endif() + + if(osx_arch_ppc64) + list(APPEND ARCH ppc64) + endif() + else() + file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}") + + enable_language(C) + + # Detect the architecture in a rather creative way... + # This compiles a small C program which is a series of ifdefs that selects a + # particular #error preprocessor directive whose message string contains the + # target architecture. The program will always fail to compile (both because + # file is not a valid C program, and obviously because of the presence of the + # #error preprocessor directives... but by exploiting the preprocessor in this + # way, we can detect the correct target architecture even when cross-compiling, + # since the program itself never needs to be run (only the compiler/preprocessor) + try_run( + run_result_unused + compile_result_unused + "${CMAKE_BINARY_DIR}" + "${CMAKE_BINARY_DIR}/arch.c" + COMPILE_OUTPUT_VARIABLE ARCH + CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES} + ) + + # Parse the architecture name from the compiler output + string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}") + + # Get rid of the value marker leaving just the architecture name + string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}") + + # If we are compiling with an unknown architecture this variable should + # already be set to "unknown" but in the case that it's empty (i.e. due + # to a typo in the code), then set it to unknown + if (NOT ARCH) + set(ARCH unknown) + endif() + endif() + + set(${output_var} "${ARCH}" PARENT_SCOPE) +endfunction() |