include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)

function(add_cflag flag)
	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
endfunction()

function(add_cxxflag flag)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
endfunction()

function(add_cflag_if_supported flag)
	get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)

	if("C" IN_LIST languages)
		string(REPLACE "-" "_" flagclean ${flag})
		string(REPLACE "=" "_" flagclean ${flagclean})
		string(REPLACE "+" "_" flagclean ${flagclean})
		string(REPLACE "," "_" flagclean ${flagclean})
		string(TOUPPER ${flagclean} flagclean)
		check_c_compiler_flag(${flag} C_SUPPORTS${flagclean})
		if (C_SUPPORTS${flagclean})
			set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
		endif()
	endif()
endfunction()

function(add_cxxflag_if_supported flag)
	get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)

	if("CXX" IN_LIST languages)
		string(REPLACE "-" "_" flagclean ${flag})
		string(REPLACE "=" "_" flagclean ${flagclean})
		string(REPLACE "+" "_" flagclean ${flagclean})
		string(REPLACE "," "_" flagclean ${flagclean})
		string(TOUPPER ${flagclean} flagclean)
		check_cxx_compiler_flag(${flag} CXX_SUPPORTS${flagclean})
		if (CXX_SUPPORTS${flagclean})
			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
		endif()
	endif()
endfunction()

###
# Code-coverage flags
###
if (CMAKE_BUILD_TYPE STREQUAL "Debug" AND NOT DEFINED STM32_CHIP AND "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
	message("-- Code coverage enabled")
	include("${CMAKE_CURRENT_LIST_DIR}/GcovReport.txt")
	# This is not detected by add_cflag_if_supported(), therefore it is done here
	set(CMAKE_C_FLAGS "-fprofile-arcs -ftest-coverage")
	set(CMAKE_CXX_FLAGS "-fprofile-arcs -ftest-coverage")
else()
	message("-- Code coverage disabled")
endif()

##
# C-compiler flags
##
if (CMAKE_BUILD_TYPE STREQUAL "Debug")
	add_definitions(-Dprotected=public -Dprivate=public -DDEBUG_BUILD)
	add_definitions(-DDI_DEBUG)
	if (NOT DEFINED OPTIMALIZATION_DEBUG)
		add_cflag(-O0)
	else()
		message(STATUS "Optimalization is overridden to: ${OPTIMALIZATION_DEBUG}")
		add_cflag(${OPTIMALIZATION_DEBUG})
	endif()

	add_cflag(-ggdb)
	#add_cflag_if_supported(-fsanitize=address)
	#add_cflag_if_supported(-fsanitize=null)
	#add_cflag_if_supported(-fsanitize=unreachable)
	#add_cflag_if_supported(-fsanitize=bool)
	#add_cflag_if_supported(-fsanitize=enum)
	#add_cflag_if_supported(-fsanitize=vptr)
else()
	add_cflag(-O2)
endif()

add_cflag(-Wall)
if (NOT DI_LEGACY_APPLICATION)
add_cflag(-Werror)
endif()
add_cflag(-Wextra)
add_cflag(-D_FORTIFY_SOURCE=2)
add_cflag(-fstrict-aliasing)
add_cflag(-std=c11)
add_cflag(-Wformat)
add_cflag(-Wformat-security)
add_cflag(-Wshadow)
add_cflag(-Wundef)
add_cflag(-Wimplicit-function-declaration)
add_cflag(-Wredundant-decls)
add_cflag(-Wconversion)
add_cflag(-Wno-float-conversion)
if (NOT DEFINED STM32_CHIP)
add_cflag(-fPIC)
if (NOT DI_LEGACY_APPLICATION)
add_cflag(-fPIE)
add_cflag_if_supported(-pie)
endif()
endif()
add_cflag_if_supported(-Wmaybe-uninitialized)
add_cflag_if_supported(-Wenum-conversion)
add_cflag_if_supported(-Wmissing-variable-declarations)
add_cflag_if_supported(-Wshorten-64-to-32)
add_cflag_if_supported(-Wl,-Bsymbolic-functions)
add_cflag_if_supported(-Wl,-z,relro)
add_cflag_if_supported(-Wl,-z,now)
add_cflag_if_supported("-Wmisleading-indentation")
add_cflag_if_supported("-Wpointer-arith")

##
# CXX-compiler flags
##
if (CMAKE_BUILD_TYPE STREQUAL "Debug")
	if (NOT DEFINED OPTIMALIZATION_DEBUG)
		add_cxxflag(-O0)
	else()
		message(STATUS "Optimalization is overridden to: ${OPTIMALIZATION_DEBUG}")
		add_cxxflag(${OPTIMALIZATION_DEBUG})
	endif()
	add_cxxflag(-ggdb)
	#add_cxxflag_if_supported(-fsanitize=address)
	#add_cxxflag_if_supported(-fsanitize=null)
	#add_cxxflag_if_supported(-fsanitize=unreachable)
	#add_cxxflag_if_supported(-fsanitize=bool)
	#add_cxxflag_if_supported(-fsanitize=enum)
	#add_cxxflag_if_supported(-fsanitize=vptr)
else()
	add_cxxflag(-O2)
endif()

add_cxxflag(-Wall)
add_cxxflag(-Werror)
add_cxxflag(-Wextra)
add_cxxflag(-D_FORTIFY_SOURCE=2)
add_cxxflag(-std=c++14)
add_cxxflag(-fstrict-aliasing)
add_cxxflag(-Wformat)
add_cxxflag(-Wformat-security)
add_cxxflag(-Wno-unused-parameter)
#add_cxxflag(-Wshadow)
add_cxxflag(-fPIC)
add_cxxflag(-Wnon-virtual-dtor)
add_cxxflag(-Wredundant-decls)
#add_cxxflag(-Wundef)
#add_cxxflag(-Wconversion)
#add_cxxflag(-Wold-style-cast)
add_cxxflag(-Wno-float-conversion)
if (NOT DI_LEGACY_APPLICATION)
add_cxxflag(-fPIE)
add_cxxflag_if_supported(-pie)
endif()
add_cxxflag_if_supported(-Wmissing-variable-declarations)
add_cxxflag_if_supported(-Wshorten-64-to-32)
add_cxxflag_if_supported(-Wimplicit-function-declaration)
add_cxxflag_if_supported(-Wmaybe-uninitialized)
add_cxxflag_if_supported(-Wl,-Bsymbolic-functions)
add_cxxflag_if_supported(-Wl,-z,relro)
add_cxxflag_if_supported(-Wl,-z,now)
add_cxxflag_if_supported("-Wmisleading-indentation")
add_cxxflag_if_supported("-Wpointer-arith")