163 lines
6.9 KiB
CMake
163 lines
6.9 KiB
CMake
|
|
# 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_COMPILER_IS_GNUCXX
|
|
# CMAKE_AR
|
|
# CMAKE_RANLIB
|
|
#
|
|
# If not already set before, it also sets
|
|
# _CMAKE_TOOLCHAIN_PREFIX
|
|
|
|
IF(NOT CMAKE_CXX_COMPILER)
|
|
SET(CMAKE_CXX_COMPILER_INIT NOTFOUND)
|
|
|
|
# prefer the environment variable CXX
|
|
IF($ENV{CXX} MATCHES ".+")
|
|
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 "First argument to CXX compiler")
|
|
ENDIF(CMAKE_CXX_FLAGS_ENV_INIT)
|
|
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(NOT EXISTS ${CMAKE_CXX_COMPILER_INIT})
|
|
ENDIF($ENV{CXX} MATCHES ".+")
|
|
|
|
# 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(NOT CMAKE_CXX_COMPILER_INIT)
|
|
ENDIF(CMAKE_GENERATOR_CXX)
|
|
|
|
# finally list compilers to try
|
|
IF(CMAKE_CXX_COMPILER_INIT)
|
|
SET(CMAKE_CXX_COMPILER_LIST ${CMAKE_CXX_COMPILER_INIT})
|
|
ELSE(CMAKE_CXX_COMPILER_INIT)
|
|
SET(CMAKE_CXX_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC)
|
|
ENDIF(CMAKE_CXX_COMPILER_INIT)
|
|
|
|
# Find the compiler.
|
|
IF (_CMAKE_USER_C_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_CXX_COMPILER NAMES ${CMAKE_CXX_COMPILER_LIST} PATHS ${_CMAKE_USER_C_COMPILER_PATH} DOC "C++ compiler" NO_DEFAULT_PATH)
|
|
ENDIF (_CMAKE_USER_C_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_CXX_COMPILER NAMES ${CMAKE_CXX_COMPILER_LIST} DOC "C++ compiler")
|
|
|
|
IF(CMAKE_CXX_COMPILER_INIT AND NOT CMAKE_CXX_COMPILER)
|
|
SET(CMAKE_CXX_COMPILER "${CMAKE_CXX_COMPILER_INIT}" CACHE FILEPATH "C++ compiler" FORCE)
|
|
ENDIF(CMAKE_CXX_COMPILER_INIT AND NOT CMAKE_CXX_COMPILER)
|
|
ELSE(NOT CMAKE_CXX_COMPILER)
|
|
|
|
# we only get here if CMAKE_CXX_COMPILER was specified using -D or a pre-made CMakeCache.txt
|
|
# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
|
|
#
|
|
# if CMAKE_CXX_COMPILER is a list of length 2, use the first item as
|
|
# CMAKE_CXX_COMPILER and the 2nd one as CMAKE_CXX_COMPILER_ARG1
|
|
|
|
LIST(LENGTH CMAKE_CXX_COMPILER _CMAKE_CXX_COMPILER_LIST_LENGTH)
|
|
IF("${_CMAKE_CXX_COMPILER_LIST_LENGTH}" EQUAL 2)
|
|
LIST(GET CMAKE_CXX_COMPILER 1 CMAKE_CXX_COMPILER_ARG1)
|
|
LIST(GET CMAKE_CXX_COMPILER 0 CMAKE_CXX_COMPILER)
|
|
ENDIF("${_CMAKE_CXX_COMPILER_LIST_LENGTH}" EQUAL 2)
|
|
|
|
# if a compiler was specified by the user but without path,
|
|
# now try to find it with the full path
|
|
# if it is found, force it into the cache,
|
|
# if not, don't overwrite the setting (which was given by the user) with "NOTFOUND"
|
|
# if the CXX compiler already had a path, reuse it for searching the C compiler
|
|
GET_FILENAME_COMPONENT(_CMAKE_USER_CXX_COMPILER_PATH "${CMAKE_CXX_COMPILER}" PATH)
|
|
IF(NOT _CMAKE_USER_CXX_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_CXX_COMPILER_WITH_PATH NAMES ${CMAKE_CXX_COMPILER})
|
|
MARK_AS_ADVANCED(CMAKE_CXX_COMPILER_WITH_PATH)
|
|
IF(CMAKE_CXX_COMPILER_WITH_PATH)
|
|
SET(CMAKE_CXX_COMPILER ${CMAKE_CXX_COMPILER_WITH_PATH} CACHE STRING "CXX compiler" FORCE)
|
|
ENDIF(CMAKE_CXX_COMPILER_WITH_PATH)
|
|
ENDIF(NOT _CMAKE_USER_CXX_COMPILER_PATH)
|
|
ENDIF(NOT CMAKE_CXX_COMPILER)
|
|
MARK_AS_ADVANCED(CMAKE_CXX_COMPILER)
|
|
|
|
IF (NOT _CMAKE_TOOLCHAIN_LOCATION)
|
|
GET_FILENAME_COMPONENT(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_CXX_COMPILER}" PATH)
|
|
ENDIF (NOT _CMAKE_TOOLCHAIN_LOCATION)
|
|
|
|
# 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++
|
|
# the other tools of the toolchain usually have the same prefix
|
|
# NAME_WE cannot be used since then this test will fail for names lile
|
|
# "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)
|
|
GET_FILENAME_COMPONENT(COMPILER_BASENAME "${CMAKE_CXX_COMPILER}" NAME)
|
|
IF (COMPILER_BASENAME MATCHES "^(.+-)[gc]\\+\\+(\\.exe)?$")
|
|
STRING(REGEX REPLACE "^(.+-)[gc]\\+\\+(\\.exe)?$" "\\1" _CMAKE_TOOLCHAIN_PREFIX "${COMPILER_BASENAME}")
|
|
ENDIF (COMPILER_BASENAME MATCHES "^(.+-)[gc]\\+\\+(\\.exe)?$")
|
|
ENDIF (NOT _CMAKE_TOOLCHAIN_PREFIX)
|
|
|
|
# This block was used before the compiler was identified by building a
|
|
# source file. Unless g++ crashes when building a small C++
|
|
# executable this should no longer be needed.
|
|
#
|
|
# The g++ that comes with BeOS 5 segfaults if you run "g++ -E"
|
|
# ("gcc -E" is fine), which throws up a system dialog box that hangs cmake
|
|
# until the user clicks "OK"...so for now, we just assume it's g++.
|
|
# IF(BEOS)
|
|
# SET(CMAKE_COMPILER_IS_GNUCXX 1)
|
|
# SET(CMAKE_COMPILER_IS_GNUCXX_RUN 1)
|
|
# ENDIF(BEOS)
|
|
|
|
# Build a small source file to identify the compiler.
|
|
IF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
|
|
SET(CMAKE_CXX_COMPILER_ID_RUN 1)
|
|
SET(CMAKE_CXX_PLATFORM_ID "Windows")
|
|
|
|
# TODO: Set the compiler id. It is probably MSVC but
|
|
# the user may be using an integrated Intel compiler.
|
|
# SET(CMAKE_CXX_COMPILER_ID "MSVC")
|
|
ENDIF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
|
|
IF(NOT CMAKE_CXX_COMPILER_ID_RUN)
|
|
SET(CMAKE_CXX_COMPILER_ID_RUN 1)
|
|
|
|
# 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
|
|
# Try compiling to an object file only.
|
|
"-c"
|
|
)
|
|
|
|
# Try to identify the compiler.
|
|
SET(CMAKE_CXX_COMPILER_ID)
|
|
FILE(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
|
|
CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT)
|
|
INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
|
|
CMAKE_DETERMINE_COMPILER_ID(CXX CXXFLAGS CMakeCXXCompilerId.cpp)
|
|
|
|
# Set old compiler and platform id variables.
|
|
IF("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
|
|
SET(CMAKE_COMPILER_IS_GNUCXX 1)
|
|
ENDIF("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
|
|
IF("${CMAKE_CXX_PLATFORM_ID}" MATCHES "MinGW")
|
|
SET(CMAKE_COMPILER_IS_MINGW 1)
|
|
ELSEIF("${CMAKE_CXX_PLATFORM_ID}" MATCHES "Cygwin")
|
|
SET(CMAKE_COMPILER_IS_CYGWIN 1)
|
|
ENDIF("${CMAKE_CXX_PLATFORM_ID}" MATCHES "MinGW")
|
|
ENDIF(NOT CMAKE_CXX_COMPILER_ID_RUN)
|
|
|
|
INCLUDE(CMakeFindBinUtils)
|
|
|
|
# configure all variables set in this file
|
|
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
|
|
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
|
|
@ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
|
|
)
|
|
|
|
SET(CMAKE_CXX_COMPILER_ENV_VAR "CXX")
|