# https://github.com/mkleemann/cmake-avr
# ----------------------------------------------------------------------------
# "THE ANY BEVERAGE-WARE LICENSE" (Revision 42 - based on beer-ware license):
# <dev@layer128.net> wrote this file. As long as you retain this notice you
# can do whatever you want with this stuff. If we meet some day, and you think
# this stuff is worth it, you can buy me a be(ve)er(age) in return. (I don't
# like beer much.)
#
# Matthias Kleemann
# ----------------------------------------------------------------------------


cmake_minimum_required(VERSION 2.8)

### TOOLCHAIN SETUP AREA #################################################
# Set any variables used in the toolchain prior project() call. In that
# case they are already set and used.
##########################################################################

include(${CMAKE_CURRENT_LIST_DIR}/toolchain.cmake)

##################################################################################
# tools to be used for programming the AVR
##################################################################################
set(AVR_UPLOADTOOL avrdude)



set(F_CPU ${MCU_SPEED})

### END TOOLCHAIN SETUP AREA #############################################

##########################################################################
# name your project
##########################################################################
#project(EXAMPLE)

##################################################################################
# status messages
##################################################################################
message(STATUS "Current uploadtool is: ${AVR_UPLOADTOOL}")
message(STATUS "Current programmer is: ${AVR_PROGRAMMER}")
message(STATUS "Current upload port is: ${AVR_UPLOADTOOL_PORT}")
message(STATUS "Current uploadtool options are: ${AVR_UPLOADTOOL_OPTIONS}")
message(STATUS "Current MCU is set to: ${AVR_MCU}")
message(STATUS "Current H_FUSE is set to: ${AVR_H_FUSE}")
message(STATUS "Current L_FUSE is set to: ${AVR_L_FUSE}")

##################################################################################
# set build type, if not already set at cmake command line
##################################################################################
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif(NOT CMAKE_BUILD_TYPE)

##################################################################################
# needs to be defined for AVR toolchain
##################################################################################
#set(MCU_SPEED "4000000UL")

##################################################################################
# some cmake cross-compile necessities
##################################################################################
if(DEFINED ENV{AVR_FIND_ROOT_PATH})
    set(CMAKE_FIND_ROOT_PATH $ENV{AVR_FIND_ROOT_PATH})
else(DEFINED ENV{AVR_FIND_ROOT_PATH})
    if(EXISTS "/opt/local/avr")
        set(CMAKE_FIND_ROOT_PATH "/opt/local/avr")
    elseif(EXISTS "/usr/avr")
        set(CMAKE_FIND_ROOT_PATH "/usr/avr")
    elseif(EXISTS "/usr/lib/avr")
        set(CMAKE_FIND_ROOT_PATH "/usr/lib/avr")
    elseif(EXISTS "/usr/local/CrossPack-AVR")
        set(CMAKE_FIND_ROOT_PATH "/usr/local/CrossPack-AVR")
    else(EXISTS "/opt/local/avr")
        message(FATAL_ERROR "Please set AVR_FIND_ROOT_PATH in your environment.")
    endif(EXISTS "/opt/local/avr")
endif(DEFINED ENV{AVR_FIND_ROOT_PATH})
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
# not added automatically, since CMAKE_SYSTEM_NAME is "generic"
set(CMAKE_SYSTEM_INCLUDE_PATH "${CMAKE_FIND_ROOT_PATH}/include")
set(CMAKE_SYSTEM_LIBRARY_PATH "${CMAKE_FIND_ROOT_PATH}/lib")

##################################################################################
# status messages for generating
##################################################################################
message(STATUS "Set CMAKE_FIND_ROOT_PATH to ${CMAKE_FIND_ROOT_PATH}")
message(STATUS "Set CMAKE_SYSTEM_INCLUDE_PATH to ${CMAKE_SYSTEM_INCLUDE_PATH}")
message(STATUS "Set CMAKE_SYSTEM_LIBRARY_PATH to ${CMAKE_SYSTEM_LIBRARY_PATH}")

##################################################################################
# set compiler options for build types
##################################################################################
if(CMAKE_BUILD_TYPE MATCHES Release)
    set(CMAKE_C_FLAGS_RELEASE "-Os")
    set(CMAKE_CXX_FLAGS_RELEASE "-Os")
endif(CMAKE_BUILD_TYPE MATCHES Release)

if(CMAKE_BUILD_TYPE MATCHES RelWithDebInfo)
    set(CMAKE_C_FLAGS_RELWITHDEBINFO "-Os -save-temps -g -gdwarf-3 -gstrict-dwarf")
    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Os -save-temps -g -gdwarf-3 -gstrict-dwarf")
endif(CMAKE_BUILD_TYPE MATCHES RelWithDebInfo)

if(CMAKE_BUILD_TYPE MATCHES Debug)
    set(CMAKE_C_FLAGS_DEBUG "-O0 -save-temps -g -gdwarf-3 -gstrict-dwarf")
    set(CMAKE_CXX_FLAGS_DEBUG "-O0 -save-temps -g -gdwarf-3 -gstrict-dwarf")
endif(CMAKE_BUILD_TYPE MATCHES Debug)

##################################################################################
# compiler options for all build types
##################################################################################
add_definitions("-DF_CPU=${MCU_SPEED}")
add_definitions("-fpack-struct")
add_definitions("-fshort-enums")
add_definitions("-Wall")
add_definitions("-Werror")
# http://gcc.gnu.org/onlinedocs/gcc-4.8.2/gcc/Alternate-Keywords.html#Alternate-Keywords
# [...]-pedantic and other options cause warnings for many GNU C extensions. You can prevent such warnings within
# one expression by writing __extension__ before the expression. __extension__ has no effect aside from this.[...]
add_definitions("-pedantic")
add_definitions("-pedantic-errors")
add_definitions("-funsigned-char")
add_definitions("-funsigned-bitfields")
add_definitions("-ffunction-sections")
add_definitions("-c")
#add_definitions("-std=gnu99")
add_definitions("-std=c++11")

add_definitions("-Os")


add_definitions("-Wno-unused-variable")
add_definitions("-Wno-unused-but-set-variable")
#add_definitions("-Wno-strict-aliasing")
add_definitions("-Wno-unknown-pragmas")
add_definitions("-Wno-write-strings")
add_definitions("-Wno-overflow")
add_definitions("-Wno-unused-function")


#add_definitions("-x c++")






##################################################################################
# add AVR executable
##################################################################################
#add_avr_executable(
#        <executable-name>
#        <sources> <headers>
#)

##################################################################################
# add AVR library
##################################################################################
#add_avr_library(
#        <library-name>
#        <sources> <headers>
#)

##################################################################################
# link library to executable
# NOTE: It needs to be the elf target.
##################################################################################
# target_link_libraries(<executable-name>-${AVR_MCU}.elf <library-name>-${AVR_MCU})
# OR easier
#target_link_libraries(<executable-name> <library-name> <some-external-libary>)


