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# defines:
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#
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# NM
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# OBJCOPY
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# LD
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# CXX_COMPILER
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# C_COMPILER
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# CMAKE_SYSTEM_NAME
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# CMAKE_SYSTEM_VERSION
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# GENROMFS
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# LINKER_FLAGS
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# CMAKE_EXE_LINKER_FLAGS
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# CMAKE_FIND_ROOT_PATH
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# CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
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# CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
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# CMAKE_FIND_ROOT_PATH_MODE_INCLUDE
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include(CMakeForceCompiler)
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# this one is important
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set(CMAKE_SYSTEM_NAME Generic)
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#this one not so much
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set(CMAKE_SYSTEM_VERSION 1)
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# specify the cross compiler
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find_program(C_COMPILER arm-none-eabi-gcc)
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if(NOT C_COMPILER)
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message(FATAL_ERROR "could not find arm-none-eabi-gcc compiler")
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endif()
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cmake_force_c_compiler(${C_COMPILER} GNU)
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find_program(CXX_COMPILER arm-none-eabi-g++)
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if(NOT CXX_COMPILER)
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message(FATAL_ERROR "could not find arm-none-eabi-g++ compiler")
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endif()
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cmake_force_cxx_compiler(${CXX_COMPILER} GNU)
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# compiler tools
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foreach(tool objcopy nm ld)
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string(TOUPPER ${tool} TOOL)
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find_program(${TOOL} arm-none-eabi-${tool})
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if(NOT ${TOOL})
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message(FATAL_ERROR "could not find ${tool}")
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endif()
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endforeach()
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# optional compiler tools
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foreach(tool gdb gdbtui)
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string(TOUPPER ${tool} TOOL)
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find_program(${TOOL} arm-none-eabi-${tool})
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if(NOT ${TOOL})
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#message(STATUS "could not find ${tool}")
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endif()
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endforeach()
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# os tools
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foreach(tool echo patch grep rm mkdir nm genromfs cp touch make unzip)
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string(TOUPPER ${tool} TOOL)
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find_program(${TOOL} ${tool})
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if(NOT ${TOOL})
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message(FATAL_ERROR "could not find ${tool}")
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endif()
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endforeach()
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# optional os tools
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foreach(tool ddd)
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string(TOUPPER ${tool} TOOL)
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find_program(${TOOL} ${tool})
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if(NOT ${TOOL})
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#message(STATUS "could not find ${tool}")
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endif()
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endforeach()
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set(cpu_flags)
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if (CMAKE_SYSTEM_PROCESSOR STREQUAL "cortex-m7")
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set(cpu_flags "-mcpu=cortex-m7 -mthumb -mfpu=fpv5-sp-d16 -mfloat-abi=hard")
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elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL "cortex-m4")
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set(cpu_flags "-mcpu=cortex-m4 -mthumb -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard")
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elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL "cortex-m3")
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set(cpu_flags "-mcpu=cortex-m3 -mthumb -march=armv7-m")
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else ()
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message(FATAL_ERROR "Processor not recognised in toolchain file")
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endif()
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set(c_flags "-fno-common -ffunction-sections -fdata-sections")
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set(cxx_flags "-fno-common -ffunction-sections -fdata-sections")
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set(CMAKE_C_FLAGS "${c_flags} ${cpu_flags}" CACHE INTERNAL "" FORCE)
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set(CMAKE_CXX_FLAGS "${cxx_flags} ${cpu_flags}" CACHE INTERNAL "" FORCE)
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set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__ " CACHE INTERNAL "" FORCE)
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set(CMAKE_EXE_LINKER_FLAGS "${cpu_flags} -nodefaultlibs -nostdlib -Wl,--warn-common,--gc-sections" CACHE INTERNAL "" FORCE)
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# where is the target environment
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set(CMAKE_FIND_ROOT_PATH get_file_component(${C_COMPILER} PATH))
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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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