104 lines
3.6 KiB
CMake
104 lines
3.6 KiB
CMake
# LINUX_ROOTFS should point to the local directory which contains all the
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# libraries and includes from the target raspi.
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# The following command can be used to do this, replace <ip-address> and the
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# local <rootfs-path> accordingly:
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# rsync -vR --progress -rl --delete-after --safe-links pi@<ip-address>:/{lib,usr,opt/vc/lib} <rootfs-path>
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# LINUX_ROOTFS needs to be passed to the CMake command or defined in the
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# application CMakeLists.txt before loading the toolchain file.
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# CROSS_COMPILE also needs to be set accordingly or passed to the CMake command
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if(NOT DEFINED ENV{LINUX_ROOTFS})
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message(FATAL_ERROR
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"Define the LINUX_ROOTFS variable to point to the Beagle Bone Black rootfs."
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)
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else()
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set(SYSROOT_PATH "$ENV{LINUX_ROOTFS}" CACHE PATH "Local Linux root filesystem path")
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message(STATUS "Beagle Bone Black sysroot: ${SYSROOT_PATH}")
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endif()
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if(NOT DEFINED ENV{CROSS_COMPILE})
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set(CROSS_COMPILE "arm-linux-gnueabihf")
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message(STATUS
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"No CROSS_COMPILE environmental variable set, using default ARM linux "
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"cross compiler name ${CROSS_COMPILE}"
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)
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else()
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set(CROSS_COMPILE "$ENV{CROSS_COMPILE}")
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message(STATUS
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"Using environmental variable CROSS_COMPILE as cross-compiler: "
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"$ENV{CROSS_COMPILE}"
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)
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endif()
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message(STATUS "Using sysroot path: ${SYSROOT_PATH}")
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set(CROSS_COMPILE_CC "${CROSS_COMPILE}-gcc")
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set(CROSS_COMPILE_CXX "${CROSS_COMPILE}-g++")
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set(CROSS_COMPILE_LD "${CROSS_COMPILE}-ld")
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set(CROSS_COMPILE_AR "${CROSS_COMPILE}-ar")
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set(CROSS_COMPILE_RANLIB "${CROSS_COMPILE}-ranlib")
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set(CROSS_COMPILE_STRIP "${CROSS_COMPILE}-strip")
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set(CROSS_COMPILE_NM "${CROSS_COMPILE}-nm")
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set(CROSS_COMPILE_OBJCOPY "${CROSS_COMPILE}-objcopy")
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set(CROSS_COMPILE_SIZE "${CROSS_COMPILE}-size")
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# At the very least, cross compile gcc and g++ have to be set!
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find_program (CROSS_COMPILE_CC_FOUND ${CROSS_COMPILE_CC} REQUIRED)
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find_program (CROSS_COMPILE_CXX_FOUND ${CROSS_COMPILE_CXX} REQUIRED)
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find_program(CROSS_COMPILE_SIZE ${CROSS_COMPILE_SIZE})
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find_program(CROSS_COMPILE_OBJCOY ${CROSS_COMPILE_OBJCOPY})
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set(CMAKE_CROSSCOMPILING TRUE)
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set(CMAKE_SYSROOT "${SYSROOT_PATH}")
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# Define name of the target system
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set(CMAKE_SYSTEM_NAME "Linux")
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set(CMAKE_SYSTEM_PROCESSOR "arm")
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# Define the compiler
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set(CMAKE_C_COMPILER ${CROSS_COMPILE_CC})
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set(CMAKE_CXX_COMPILER ${CROSS_COMPILE_CXX})
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set(CMAKE_SIZE ${CROSS_COMPILE_SIZE})
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set(CMAKE_OBJCOPY ${CROSS_COMPILE_OBJCOPY})
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# List of library dirs where LD has to look. Pass them directly through gcc.
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# LD_LIBRARY_PATH is not evaluated by arm-*-ld
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set(LIB_DIRS
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"${SYSROOT_PATH}/lib/${CROSS_COMPILE}"
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"${SYSROOT_PATH}/usr/local/lib"
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"${SYSROOT_PATH}/usr/lib/${CROSS_COMPILE}"
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"${SYSROOT_PATH}/usr/lib"
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)
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# You can additionally check the linker paths if you add the
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# flags ' -Xlinker --verbose'
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set(COMMON_FLAGS "-I${SYSROOT_PATH}/usr/include")
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foreach(LIB ${LIB_DIRS})
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set(COMMON_FLAGS "${COMMON_FLAGS} -L${LIB} -Wl,-rpath-link,${LIB}")
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endforeach()
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set(CMAKE_PREFIX_PATH
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"${CMAKE_PREFIX_PATH}"
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"${SYSROOT_PATH}/usr/lib/${CROSS_COMPILE}"
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)
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set(CMAKE_C_FLAGS
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"-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard ${COMMON_FLAGS}"
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CACHE STRING "Flags for Beagle Bone Black"
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)
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set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}"
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CACHE STRING "Flags for Beagle Bone Black"
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)
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set(CMAKE_FIND_ROOT_PATH
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"${CMAKE_INSTALL_PREFIX};${CMAKE_PREFIX_PATH};${CMAKE_SYSROOT}"
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)
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# search for programs in the build host directories
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set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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# for libraries and headers in the target directories
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set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
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