set(CMAKE_SYSTEM_NAME Generic-ELF)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

set(hints_paths)

if (CMAKE_HOST_WIN32)
    set(X86_PROGRAM_FILES "ProgramFiles(x86)")
    list(APPEND hints_paths "$ENV{${X86_PROGRAM_FILES}}/Arm GNU Toolchain arm-none-eabi/12.2 rel1/bin")
    list(APPEND hints_paths "$ENV{${X86_PROGRAM_FILES}}/GNU Arm Embedded Toolchain/10 2021.10/bin/")
endif()

find_program(CMAKE_C_COMPILER
    NAMES arm-none-eabi-gcc
    HINTS ${hints_paths}
    REQUIRED)

find_program(CMAKE_CXX_COMPILER
    NAMES arm-none-eabi-g++
    HINTS ${hints_paths}
    REQUIRED)

find_program(CMAKE_ASM_COMPILER
    NAMES arm-none-eabi-gcc
    HINTS ${hints_paths})

find_program(CMAKE_AR
    NAMES arm-none-eabi-ar
    HINTS ${hints_paths})

find_program(CMAKE_RANLIB
    NAMES arm-none-eabi-ranlib
    HINTS ${hints_paths})

find_program(CMAKE_NM
    NAMES arm-none-eabi-nm
    HINTS ${hints_paths})

find_program(EMIL_LD_TOOL
    NAMES arm-none-eabi-ld
    HINTS ${hints_paths})

find_program(EMIL_APP_SIZE_TOOL
    NAMES arm-none-eabi-size
    HINTS ${hints_paths})

find_program(EMIL_OBJ_COPY_TOOL
    NAMES arm-none-eabi-objcopy
    HINTS ${hints_paths})

find_program(EMIL_OBJ_DUMP_TOOL
    NAMES arm-none-eabi-objdump
    HINTS ${hints_paths})

find_program(EMIL_DEBUG_TOOL
    NAMES arm-none-eabi-gdb
    HINTS ${hints_paths})

set(CMAKE_ASM_FLAGS_RELEASE "-g" CACHE STRING "" FORCE)
set(CMAKE_ASM_FLAGS_RELWITHDEBINFO "-g" CACHE STRING "" FORCE)
set(CMAKE_ASM_FLAGS_MINSIZEREL "" CACHE STRING "" FORCE)

# Features for LINK_GROUP generator expression
## RESCAN: request the linker to rescan static libraries until there is
## no pending undefined symbols
set(CMAKE_LINK_GROUP_USING_RESCAN "LINKER:--start-group" "LINKER:--end-group")
set(CMAKE_LINK_GROUP_USING_RESCAN_SUPPORTED TRUE)

add_link_options(LINKER:--gc-sections,--print-memory-usage)
add_link_options(-specs=nano.specs -nostartfiles -mthumb)

add_compile_options($<$<COMPILE_LANGUAGE:C>:-ffunction-sections$<SEMICOLON>-fdata-sections$<SEMICOLON>-mthumb>)
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-ffunction-sections$<SEMICOLON>-fdata-sections$<SEMICOLON>-mthumb>)
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-use-cxa-atexit$<SEMICOLON>-fno-threadsafe-statics$<SEMICOLON>-fno-rtti$<SEMICOLON>-fno-exceptions>)