# SPDX-License-Identifier: Apache-2.0

set(ARM_C_FLAGS)

list(APPEND ARM_C_FLAGS   -mcpu=${GCC_M_CPU})

if(CONFIG_COMPILER_ISA_THUMB2)
  list(APPEND ARM_C_FLAGS   -mthumb)
endif()

list(APPEND ARM_C_FLAGS -mabi=aapcs)

if(CONFIG_FPU)
  list(APPEND ARM_C_FLAGS   -mfpu=${GCC_M_FPU})

  if(CONFIG_DCLS AND NOT CONFIG_FP_HARDABI)
    # If the processor is equipped with VFP and configured in DCLS topology,
    # the FP "hard" ABI must be used in order to facilitate the FP register
    # initialisation and synchronisation.
    set(FORCE_FP_HARDABI TRUE)
  endif()

  if    (CONFIG_FP_HARDABI OR FORCE_FP_HARDABI)
    list(APPEND ARM_C_FLAGS   -mfloat-abi=hard)
  elseif(CONFIG_FP_SOFTABI)
    list(APPEND ARM_C_FLAGS   -mfloat-abi=softfp)
  endif()
else()
  list(APPEND ARM_C_FLAGS   -mfpu=none)
  # Disable usage of FPU registers
  list(APPEND ARM_C_FLAGS   -mfloat-abi=soft)
endif()

if(CONFIG_FP16)
  # Clang only supports IEEE 754-2008 format for __fp16. It's enabled by
  # default, so no need to do anything when CONFIG_FP16_IEEE is selected.
  if(CONFIG_FP16_ALT)
    message(FATAL_ERROR "Clang doesn't support ARM alternative format for FP16")
  endif()
endif()
list(APPEND TOOLCHAIN_C_FLAGS ${ARM_C_FLAGS})
list(APPEND TOOLCHAIN_LD_FLAGS NO_SPLIT ${ARM_C_FLAGS})