diff options
Diffstat (limited to 'Modules/CMakeDetermineCXXCompiler.cmake')
-rw-r--r-- | Modules/CMakeDetermineCXXCompiler.cmake | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake new file mode 100644 index 000000000..7f8f3ec8b --- /dev/null +++ b/Modules/CMakeDetermineCXXCompiler.cmake @@ -0,0 +1,188 @@ + +#============================================================================= +# Copyright 2002-2009 Kitware, Inc. +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + +# 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) + +# 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(${CMAKE_GENERATOR} MATCHES "Visual Studio") + SET(CMAKE_CXX_COMPILER_ID_RUN 1) + SET(CMAKE_CXX_PLATFORM_ID "Windows") + SET(CMAKE_CXX_COMPILER_ID "MSVC") +ENDIF(${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("${CMAKE_CXX_PLATFORM_ID}" MATCHES "MinGW") +ENDIF(NOT CMAKE_CXX_COMPILER_ID_RUN) + +# if we have a g++ cross compiler, they have usually some prefix, like +# e.g. powerpc-linux-g++, arm-elf-g++ or i586-mingw32msvc-g++ , optionally +# with a 3-component version number at the end (e.g. arm-eabi-gcc-4.5.2). +# The other tools of the toolchain usually have the same prefix +# NAME_WE cannot be used since then this test will fail for names lile +# "arm-unknown-nto-qnx6.3.0-gcc.exe", where BASENAME would be +# "arm-unknown-nto-qnx6" instead of the correct "arm-unknown-nto-qnx6.3.0-" +IF (CMAKE_CROSSCOMPILING + AND "${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" + AND NOT _CMAKE_TOOLCHAIN_PREFIX) + GET_FILENAME_COMPONENT(COMPILER_BASENAME "${CMAKE_CXX_COMPILER}" NAME) + IF (COMPILER_BASENAME MATCHES "^(.+-)[gc]\\+\\+(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$") + SET(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1}) + ENDIF (COMPILER_BASENAME MATCHES "^(.+-)[gc]\\+\\+(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$") + + # 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 ${CMAKE_MATCH_1}) + ENDIF ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$") + +ENDIF (CMAKE_CROSSCOMPILING + AND "${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" + AND NOT _CMAKE_TOOLCHAIN_PREFIX) + +INCLUDE(${CMAKE_ROOT}/Modules/CMakeClDeps.cmake) +INCLUDE(CMakeFindBinUtils) +IF(MSVC_CXX_ARCHITECTURE_ID) + SET(SET_MSVC_CXX_ARCHITECTURE_ID + "SET(MSVC_CXX_ARCHITECTURE_ID ${MSVC_CXX_ARCHITECTURE_ID})") +ENDIF(MSVC_CXX_ARCHITECTURE_ID) +# configure all variables set in this file +CONFIGURE_FILE(${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") |