arm neon-check "uname -m" if CMAKE_SYSTEM_PROCESSOR is not what we expect (#1966)
* arm neon - check "uname -m" if CMAKE_SYSTEM_PROCESSOR is not what we expect * skip arm neon check it not on linux
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@ -69,7 +69,24 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
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# GCC below 6.0 doesn't support __target__("fpu=neon") attribute, required for compiling ARM Neon code, otherwise compilation fails.
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# Must use -mfpu=neon compiler flag instead, but only do that for processors that support neon, otherwise strip the neon code alltogether,
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# because passing -fmpu=neon is unsafe to processors that don't support neon
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IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
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# Arm neon support only tested on Linux. If your arm hardware is running a non-Linux distro and is using gcc then contact us.
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IF (CMAKE_SYSTEM_NAME MATCHES "Linux")
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string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" ZM_SYSTEM_PROC)
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IF((ZM_SYSTEM_PROC STREQUAL "") OR (ZM_SYSTEM_PROC STREQUAL "unknown"))
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execute_process(COMMAND uname -m OUTPUT_VARIABLE ZM_SYSTEM_PROC ERROR_VARIABLE ZM_SYSTEM_PROC_ERR)
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# maybe make the following error checks fatal
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IF(ZM_SYSTEM_PROC_ERR)
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message(WARNING "\nAn error occurred while attempting to determine the system processor:\n${ZM_SYSTEM_PROC_ERR}")
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ENDIF(ZM_SYSTEM_PROC_ERR)
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IF(NOT ZM_SYSTEM_PROC)
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message(WARNING "\nUnable to determine the system processor. This may cause a build failure.\n")
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ENDIF(ZM_SYSTEM_PROC)
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ENDIF((ZM_SYSTEM_PROC STREQUAL "") OR (ZM_SYSTEM_PROC STREQUAL "unknown"))
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IF(ZM_SYSTEM_PROC MATCHES "^arm")
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IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
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EXEC_PROGRAM(grep ARGS " neon " "/proc/cpuinfo" OUTPUT_VARIABLE neonoutput RETURN_VALUE neonresult)
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IF(neonresult EQUAL 0)
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@ -82,7 +99,8 @@ IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
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message(STATUS "ARM Neon is not available on this processor. Neon functions will be absent")
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ENDIF(neonresult EQUAL 0)
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ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
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ENDIF(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
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ENDIF(ZM_SYSTEM_PROC MATCHES "^arm")
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ENDIF (CMAKE_SYSTEM_NAME MATCHES "Linux")
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# Modules that we need:
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include (GNUInstallDirs)
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