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

# Official ARM GNU toolchain (ships newlib). In Docker the compiler is found via PATH.
file(GLOB _nl_arm_bins "/Applications/ArmGNUToolchain/*/arm-none-eabi/bin")
list(SORT _nl_arm_bins ORDER DESCENDING)
set(_nl_arm_default "")
if(_nl_arm_bins)
  list(GET _nl_arm_bins 0 _nl_arm_default)
endif()
set(NL_ARM_TOOLCHAIN_BIN "${_nl_arm_default}" CACHE PATH "bin directory of the ARM GNU toolchain (empty = PATH)")

if(NL_ARM_TOOLCHAIN_BIN)
  set(_nl_prefix "${NL_ARM_TOOLCHAIN_BIN}/arm-none-eabi-")
else()
  set(_nl_prefix "arm-none-eabi-")
endif()

set(CMAKE_C_COMPILER   "${_nl_prefix}gcc")
set(CMAKE_ASM_COMPILER "${_nl_prefix}gcc")
set(CMAKE_OBJCOPY      "${_nl_prefix}objcopy" CACHE INTERNAL "")
set(CMAKE_SIZE         "${_nl_prefix}size"    CACHE INTERNAL "")
set(CMAKE_EXE_LINKER_FLAGS_INIT "--specs=nosys.specs")