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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
This commit is contained in:
Andrew Bauer 2017-08-21 11:02:28 -05:00 committed by Isaac Connor
parent ac5d1738ea
commit 613bbfb65b
1 changed files with 32 additions and 14 deletions
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46
CMakeLists.txt
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@ -69,20 +69,38 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
# GCC below 6.0 doesn't support __target__("fpu=neon") attribute, required for compiling ARM Neon code, otherwise compilation fails.
# Must use -mfpu=neon compiler flag instead, but only do that for processors that support neon, otherwise strip the neon code alltogether,
# because passing -fmpu=neon is unsafe to processors that don't support neon
IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
EXEC_PROGRAM(grep ARGS " neon " "/proc/cpuinfo" OUTPUT_VARIABLE neonoutput RETURN_VALUE neonresult)
IF(neonresult EQUAL 0)
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -mfpu=neon")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -mfpu=neon")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -mfpu=neon")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -mfpu=neon")
ELSE(neonresult EQUAL 0)
add_definitions(-DZM_STRIP_NEON=1)
message(STATUS "ARM Neon is not available on this processor. Neon functions will be absent")
ENDIF(neonresult EQUAL 0)
ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
ENDIF(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
# Arm neon support only tested on Linux. If your arm hardware is running a non-Linux distro and is using gcc then contact us.
IF (CMAKE_SYSTEM_NAME MATCHES "Linux")
string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" ZM_SYSTEM_PROC)
IF((ZM_SYSTEM_PROC STREQUAL "") OR (ZM_SYSTEM_PROC STREQUAL "unknown"))
execute_process(COMMAND uname -m OUTPUT_VARIABLE ZM_SYSTEM_PROC ERROR_VARIABLE ZM_SYSTEM_PROC_ERR)
# maybe make the following error checks fatal
IF(ZM_SYSTEM_PROC_ERR)
message(WARNING "\nAn error occurred while attempting to determine the system processor:\n${ZM_SYSTEM_PROC_ERR}")
ENDIF(ZM_SYSTEM_PROC_ERR)
IF(NOT ZM_SYSTEM_PROC)
message(WARNING "\nUnable to determine the system processor. This may cause a build failure.\n")
ENDIF(ZM_SYSTEM_PROC)
ENDIF((ZM_SYSTEM_PROC STREQUAL "") OR (ZM_SYSTEM_PROC STREQUAL "unknown"))
IF(ZM_SYSTEM_PROC MATCHES "^arm")
IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
EXEC_PROGRAM(grep ARGS " neon " "/proc/cpuinfo" OUTPUT_VARIABLE neonoutput RETURN_VALUE neonresult)
IF(neonresult EQUAL 0)
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -mfpu=neon")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -mfpu=neon")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -mfpu=neon")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -mfpu=neon")
ELSE(neonresult EQUAL 0)
add_definitions(-DZM_STRIP_NEON=1)
message(STATUS "ARM Neon is not available on this processor. Neon functions will be absent")
ENDIF(neonresult EQUAL 0)
ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
ENDIF(ZM_SYSTEM_PROC MATCHES "^arm")
ENDIF (CMAKE_SYSTEM_NAME MATCHES "Linux")
# Modules that we need:
include (GNUInstallDirs)