pw_toolchain/arm_clang/BUILD.gn

# Copyright 2021 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

import("//build_overrides/pigweed.gni")

import("clang_config.gni")

cortex_m_common_flags = [
  "-mabi=aapcs",
  "-mthumb",
]

cortex_m_software_fpu_flags = [ "-mfloat-abi=soft" ]

cortex_m_hardware_fpu_flags = [
  "-mfloat-abi=hard",
  "-mfpu=fpv4-sp-d16",

  # Used by some pigweed tests/targets to correctly handle hardware FPU
  # behavior.
  "-DPW_ARMV7M_ENABLE_FPU=1",
]

config("enable_float_printf") {
  ldflags = [ "-Wl,-u_printf_float" ]
}

pw_clang_arm_config("cortex_m3") {
  cflags = [ "-mcpu=cortex-m3" ]
  cflags += cortex_m_common_flags
  cflags += cortex_m_software_fpu_flags
  asmflags = cflags
  ldflags = cflags
}

pw_clang_arm_config("cortex_m4f") {
  cflags = [ "-mcpu=cortex-m4" ]
  cflags += cortex_m_common_flags
  cflags += cortex_m_hardware_fpu_flags
  asmflags = cflags
  ldflags = cflags
}