cmake/toolchain/armclang.cmake

#
# Copyright (c) 2020-2022 Arm Limited. All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
#
# 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
#
# 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.
#

set(TARGET_CPU "cortex-m4" CACHE STRING "Target CPU")
string(TOLOWER ${TARGET_CPU} CMAKE_SYSTEM_PROCESSOR)

set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_C_COMPILER "armclang")
set(CMAKE_CXX_COMPILER "armclang")
set(CMAKE_ASM_COMPILER "armclang")
set(CMAKE_LINKER "armlink")

set(CMAKE_EXECUTABLE_SUFFIX ".elf")
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

# Select C/C++ version
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 14)

# Link target
string(REGEX MATCH "^cortex-m([0-9]+)([a-z]*)" __LINK_TARGET ${CMAKE_SYSTEM_PROCESSOR})
if (CMAKE_SYSTEM_PROCESSOR MATCHES "nodsp")
    string(APPEND __LINK_TARGET ".no_dsp")
endif()
if (CMAKE_SYSTEM_PROCESSOR MATCHES "nofp")
    string(APPEND __LINK_TARGET ".no_fp")
endif()

if (CMAKE_SYSTEM_PROCESSOR MATCHES "cortex-m55")
    set(__LINK_TARGET 8.1-M.Main.dsp)
endif()

# Compile options
add_compile_options(
    -mcpu=${CMAKE_SYSTEM_PROCESSOR}
    -mthumb
    "$<$<CONFIG:DEBUG>:-gdwarf-3>"
    "$<$<COMPILE_LANGUAGE:CXX>:-fno-unwind-tables;-fno-rtti;-fno-exceptions>")

# Compile defines
add_compile_definitions(
    "$<$<NOT:$<CONFIG:DEBUG>>:NDEBUG>")

# Link options
add_link_options(
    --cpu=${__LINK_TARGET}
    --lto
    --info common,debug,sizes,totals,veneers,unused
    --symbols
    --diag_suppress=L6439W)

# Compilation warnings
add_compile_options(
    -Wall
    -Wextra

    -Wcast-align
    -Wdouble-promotion
    -Wformat
    -Wmissing-field-initializers
    -Wnull-dereference
    -Wredundant-decls
    -Wshadow
    -Wswitch-default
    -Wunused
)