# SPDX-License-Identifier: Apache-2.0

# ----------------------------------------------------------------------------

# Copyright 2020-2025 Arm Limited

#

# 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:

#

# http://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.

# ----------------------------------------------------------------------------

# On CMake 3.25 or older CXX_COMPILER_FRONTEND_VARIANT is not always set

if(CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "")

set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "${CMAKE_CXX_COMPILER_ID}")

endif()

# Compiler accepts MSVC-style command line options

set(is_msvc_fe "$<STREQUAL:${CMAKE_CXX_COMPILER_FRONTEND_VARIANT},MSVC>")

# Compiler accepts GNU-style command line options

set(is_gnu_fe1 "$<STREQUAL:${CMAKE_CXX_COMPILER_FRONTEND_VARIANT},GNU>")

# Compiler accepts AppleClang-style command line options, which is also GNU-style

set(is_gnu_fe2 "$<STREQUAL:${CMAKE_CXX_COMPILER_FRONTEND_VARIANT},AppleClang>")

# Compiler accepts GNU-style command line options

set(is_gnu_fe "$<OR:${is_gnu_fe1},${is_gnu_fe2}>")

# Compiler is Visual Studio cl.exe

set(is_msvccl "$<AND:${is_msvc_fe},$<CXX_COMPILER_ID:MSVC>>")

# Compiler is Visual Studio clangcl.exe

set(is_clangcl "$<AND:${is_msvc_fe},$<CXX_COMPILER_ID:Clang>>")

# Compiler is upstream clang with the standard frontend

set(is_clang "$<AND:${is_gnu_fe},$<CXX_COMPILER_ID:Clang,AppleClang>>")