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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
# determine the compiler to use for C++ programs
# NOTE, a generator may set CMAKE_CXX_COMPILER before
# loading this file to force a compiler.
# use environment variable CXX first if defined by user, next use
# the cmake variable CMAKE_GENERATOR_CXX which can be defined by a generator
# as a default compiler
# If the internal cmake variable _CMAKE_TOOLCHAIN_PREFIX is set, this is used
# as prefix for the tools (e.g. arm-elf-g++, arm-elf-ar etc.)
#
# Sets the following variables:
# CMAKE_CXX_COMPILER
# CMAKE_AR
# CMAKE_RANLIB
#
# If not already set before, it also sets
# _CMAKE_TOOLCHAIN_PREFIX
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
# Load system-specific compiler preferences for this language.
include(Platform/${CMAKE_SYSTEM_NAME}-Determine-CXX OPTIONAL)
include(Platform/${CMAKE_SYSTEM_NAME}-CXX OPTIONAL)
if(NOT CMAKE_CXX_COMPILER_NAMES)
set(CMAKE_CXX_COMPILER_NAMES CC)
endif()
if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
elseif("${CMAKE_GENERATOR}" MATCHES "Green Hills MULTI")
elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
set(CMAKE_CXX_COMPILER_XCODE_TYPE sourcecode.cpp.cpp)
_cmake_find_compiler_path(CXX)
else()
if(NOT CMAKE_CXX_COMPILER)
set(CMAKE_CXX_COMPILER_INIT NOTFOUND)
# prefer the environment variable CXX
if(NOT $ENV{CXX} STREQUAL "")
get_filename_component(CMAKE_CXX_COMPILER_INIT $ENV{CXX} PROGRAM PROGRAM_ARGS CMAKE_CXX_FLAGS_ENV_INIT)
if(CMAKE_CXX_FLAGS_ENV_INIT)
set(CMAKE_CXX_COMPILER_ARG1 "${CMAKE_CXX_FLAGS_ENV_INIT}" CACHE STRING "Arguments to CXX compiler")
endif()
if(NOT EXISTS ${CMAKE_CXX_COMPILER_INIT})
message(FATAL_ERROR "Could not find compiler set in environment variable CXX:\n$ENV{CXX}.\n${CMAKE_CXX_COMPILER_INIT}")
endif()
endif()
# next prefer the generator specified compiler
if(CMAKE_GENERATOR_CXX)
if(NOT CMAKE_CXX_COMPILER_INIT)
set(CMAKE_CXX_COMPILER_INIT ${CMAKE_GENERATOR_CXX})
endif()
endif()
# finally list compilers to try
if(NOT CMAKE_CXX_COMPILER_INIT)
set(CMAKE_CXX_COMPILER_LIST CC ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ aCC cl bcc xlC)
if(NOT CMAKE_HOST_WIN32)
# FIXME(#24314): Add support for the GNU-like icpx compiler driver
# on Windows, first introduced by Intel oneAPI 2023.0.
list(APPEND CMAKE_CXX_COMPILER_LIST icpx)
endif()
list(APPEND CMAKE_CXX_COMPILER_LIST icx clang++)
endif()
_cmake_find_compiler(CXX)
else()
_cmake_find_compiler_path(CXX)
endif()
mark_as_advanced(CMAKE_CXX_COMPILER)
# Each entry in this list is a set of extra flags to try
# adding to the compile line to see if it helps produce
# a valid identification file.
set(CMAKE_CXX_COMPILER_ID_TEST_FLAGS_FIRST)
set(CMAKE_CXX_COMPILER_ID_TEST_FLAGS
# Try compiling to an object file only.
"-c"
# IAR does not detect language automatically
"--c++"
"--ec++"
# ARMClang need target options
"--target=arm-arm-none-eabi -mcpu=cortex-m3"
# MSVC needs at least one include directory for __has_include to function,
# but custom toolchains may run MSVC with no INCLUDE env var and no -I flags.
# Also avoid linking so this works with no LIB env var.
"-c -I__does_not_exist__"
)
endif()
if(CMAKE_CXX_COMPILER_TARGET)
set(CMAKE_CXX_COMPILER_ID_TEST_FLAGS_FIRST "-c --target=${CMAKE_CXX_COMPILER_TARGET}")
endif()
# Build a small source file to identify the compiler.
if(NOT CMAKE_CXX_COMPILER_ID_RUN)
set(CMAKE_CXX_COMPILER_ID_RUN 1)
# Try to identify the compiler.
set(CMAKE_CXX_COMPILER_ID)
set(CMAKE_CXX_PLATFORM_ID)
file(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT)
# The IAR compiler produces weird output.
# See https://gitlab.kitware.com/cmake/cmake/-/issues/10176#note_153591
list(APPEND CMAKE_CXX_COMPILER_ID_VENDORS IAR)
set(CMAKE_CXX_COMPILER_ID_VENDOR_FLAGS_IAR )
set(CMAKE_CXX_COMPILER_ID_VENDOR_REGEX_IAR "IAR .+ Compiler")
# Match the link line from xcodebuild output of the form
# Ld ...
# ...
# /path/to/cc ...CompilerIdCXX/...
# to extract the compiler front-end for the language.
set(CMAKE_CXX_COMPILER_ID_TOOL_MATCH_REGEX "\nLd[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]*-o[^\r\n]*CompilerIdCXX/(\\./)?(CompilerIdCXX.(framework|xctest|build/[^ \t\r\n]+)/)?CompilerIdCXX[ \t\n\\\"]")
set(CMAKE_CXX_COMPILER_ID_TOOL_MATCH_INDEX 2)
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(CXX CXXFLAGS CMakeCXXCompilerId.cpp)
_cmake_find_compiler_sysroot(CXX)
# Set old compiler and platform id variables.
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(CMAKE_COMPILER_IS_GNUCXX 1)
endif()
else()
if(NOT DEFINED CMAKE_CXX_COMPILER_FRONTEND_VARIANT)
# Some toolchain files set our internal CMAKE_CXX_COMPILER_ID_RUN
# variable but are not aware of CMAKE_CXX_COMPILER_FRONTEND_VARIANT.
# They pre-date our support for the GNU-like variant targeting the
# MSVC ABI so we do not consider that here.
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
OR "x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xIntelLLVM")
if("x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "MSVC")
else()
set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "GNU")
endif()
else()
set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "")
endif()
endif()
endif()
if (NOT _CMAKE_TOOLCHAIN_LOCATION)
get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_CXX_COMPILER}" PATH)
endif ()
# if we have a g++ cross compiler, they have usually some prefix, like
# e.g. powerpc-linux-g++, arm-elf-g++ or i586-mingw32msvc-g++ , optionally
# with a 3-component version number at the end (e.g. arm-eabi-gcc-4.5.2).
# The other tools of the toolchain usually have the same prefix
# NAME_WE cannot be used since then this test will fail for names like
# "arm-unknown-nto-qnx6.3.0-gcc.exe", where BASENAME would be
# "arm-unknown-nto-qnx6" instead of the correct "arm-unknown-nto-qnx6.3.0-"
if (NOT _CMAKE_TOOLCHAIN_PREFIX)
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang|QCC|LCC")
get_filename_component(COMPILER_BASENAME "${CMAKE_CXX_COMPILER}" NAME)
if (COMPILER_BASENAME MATCHES "^(.+-)?(clang\\+\\+|[gc]\\+\\+|clang-cl)(-?[0-9]+(\\.[0-9]+)*)?(-[^.]+)?(\\.exe)?$")
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
set(_CMAKE_TOOLCHAIN_SUFFIX ${CMAKE_MATCH_3})
set(_CMAKE_COMPILER_SUFFIX ${CMAKE_MATCH_5})
elseif(CMAKE_CXX_COMPILER_ID MATCHES "TIClang")
if (COMPILER_BASENAME MATCHES "^(.+)?clang(\\.exe)?$")
set(_CMAKE_TOOLCHAIN_PREFIX "${CMAKE_MATCH_1}")
set(_CMAKE_TOOLCHAIN_SUFFIX "${CMAKE_MATCH_2}")
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
if(CMAKE_CXX_COMPILER_TARGET)
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_CXX_COMPILER_TARGET}-)
endif()
elseif(COMPILER_BASENAME MATCHES "QCC(\\.exe)?$")
if(CMAKE_CXX_COMPILER_TARGET MATCHES "gcc_nto([a-z0-9]+_[0-9]+|[^_le]+)(le)")
set(_CMAKE_TOOLCHAIN_PREFIX nto${CMAKE_MATCH_1}-)
endif()
endif ()
# if "llvm-" is part of the prefix, remove it, since llvm doesn't have its own binutils
# but uses the regular ar, objcopy, etc. (instead of llvm-objcopy etc.)
if ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$")
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
endif ()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "TI")
# TI compilers are named e.g. cl6x, cl470 or armcl.exe
get_filename_component(COMPILER_BASENAME "${CMAKE_CXX_COMPILER}" NAME)
if (COMPILER_BASENAME MATCHES "^(.+)?cl([^.]+)?(\\.exe)?$")
set(_CMAKE_TOOLCHAIN_PREFIX "${CMAKE_MATCH_1}")
set(_CMAKE_TOOLCHAIN_SUFFIX "${CMAKE_MATCH_2}")
endif ()
endif()
endif ()
set(_CMAKE_PROCESSING_LANGUAGE "CXX")
include(CMakeFindBinUtils)
include(Compiler/${CMAKE_CXX_COMPILER_ID}-FindBinUtils OPTIONAL)
unset(_CMAKE_PROCESSING_LANGUAGE)
if(CMAKE_CXX_COMPILER_SYSROOT)
string(CONCAT _SET_CMAKE_CXX_COMPILER_SYSROOT
"set(CMAKE_CXX_COMPILER_SYSROOT \"${CMAKE_CXX_COMPILER_SYSROOT}\")\n"
"set(CMAKE_COMPILER_SYSROOT \"${CMAKE_CXX_COMPILER_SYSROOT}\")")
else()
set(_SET_CMAKE_CXX_COMPILER_SYSROOT "")
endif()
if(MSVC_CXX_ARCHITECTURE_ID)
set(SET_MSVC_CXX_ARCHITECTURE_ID
"set(MSVC_CXX_ARCHITECTURE_ID ${MSVC_CXX_ARCHITECTURE_ID})")
endif()
if(CMAKE_CXX_XCODE_ARCHS)
set(SET_CMAKE_XCODE_ARCHS
"set(CMAKE_XCODE_ARCHS \"${CMAKE_CXX_XCODE_ARCHS}\")")
endif()
# configure all variables set in this file
configure_file(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake
@ONLY
)
set(CMAKE_CXX_COMPILER_ENV_VAR "CXX")
|
