179 lines
7.2 KiB
CMake
179 lines
7.2 KiB
CMake
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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# determine the compiler to use for C programs
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# NOTE, a generator may set CMAKE_C_COMPILER before
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# loading this file to force a compiler.
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# use environment variable CC first if defined by user, next use
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# the cmake variable CMAKE_GENERATOR_CC which can be defined by a generator
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# as a default compiler
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# If the internal cmake variable _CMAKE_TOOLCHAIN_PREFIX is set, this is used
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# as prefix for the tools (e.g. arm-elf-gcc, arm-elf-ar etc.). This works
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# currently with the GNU crosscompilers.
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#
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# Sets the following variables:
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# CMAKE_C_COMPILER
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# CMAKE_AR
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# CMAKE_RANLIB
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# CMAKE_COMPILER_IS_GNUCC
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#
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# If not already set before, it also sets
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# _CMAKE_TOOLCHAIN_PREFIX
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
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# Load system-specific compiler preferences for this language.
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include(Platform/${CMAKE_SYSTEM_NAME}-C OPTIONAL)
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if(NOT CMAKE_C_COMPILER_NAMES)
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set(CMAKE_C_COMPILER_NAMES cc)
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endif()
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if(NOT CMAKE_C_COMPILER)
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set(CMAKE_C_COMPILER_INIT NOTFOUND)
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# prefer the environment variable CC
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if($ENV{CC} MATCHES ".+")
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get_filename_component(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
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if(CMAKE_C_FLAGS_ENV_INIT)
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set(CMAKE_C_COMPILER_ARG1 "${CMAKE_C_FLAGS_ENV_INIT}" CACHE STRING "First argument to C compiler")
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endif(CMAKE_C_FLAGS_ENV_INIT)
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if(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
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message(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
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endif(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
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endif($ENV{CC} MATCHES ".+")
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# next try prefer the compiler specified by the generator
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if(CMAKE_GENERATOR_CC)
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if(NOT CMAKE_C_COMPILER_INIT)
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set(CMAKE_C_COMPILER_INIT ${CMAKE_GENERATOR_CC})
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endif(NOT CMAKE_C_COMPILER_INIT)
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endif(CMAKE_GENERATOR_CC)
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# finally list compilers to try
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if(NOT CMAKE_C_COMPILER_INIT)
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set(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}cc ${_CMAKE_TOOLCHAIN_PREFIX}gcc cl bcc xlc clang)
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endif()
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_cmake_find_compiler(C)
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else(NOT CMAKE_C_COMPILER)
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# we only get here if CMAKE_C_COMPILER was specified using -D or a pre-made CMakeCache.txt
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# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
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# if CMAKE_C_COMPILER is a list of length 2, use the first item as
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# CMAKE_C_COMPILER and the 2nd one as CMAKE_C_COMPILER_ARG1
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list(LENGTH CMAKE_C_COMPILER _CMAKE_C_COMPILER_LIST_LENGTH)
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if("${_CMAKE_C_COMPILER_LIST_LENGTH}" EQUAL 2)
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list(GET CMAKE_C_COMPILER 1 CMAKE_C_COMPILER_ARG1)
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list(GET CMAKE_C_COMPILER 0 CMAKE_C_COMPILER)
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endif("${_CMAKE_C_COMPILER_LIST_LENGTH}" EQUAL 2)
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# if a compiler was specified by the user but without path,
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# now try to find it with the full path
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# if it is found, force it into the cache,
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# if not, don't overwrite the setting (which was given by the user) with "NOTFOUND"
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# if the C compiler already had a path, reuse it for searching the CXX compiler
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get_filename_component(_CMAKE_USER_C_COMPILER_PATH "${CMAKE_C_COMPILER}" PATH)
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if(NOT _CMAKE_USER_C_COMPILER_PATH)
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find_program(CMAKE_C_COMPILER_WITH_PATH NAMES ${CMAKE_C_COMPILER})
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mark_as_advanced(CMAKE_C_COMPILER_WITH_PATH)
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if(CMAKE_C_COMPILER_WITH_PATH)
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set(CMAKE_C_COMPILER ${CMAKE_C_COMPILER_WITH_PATH} CACHE STRING "C compiler" FORCE)
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endif(CMAKE_C_COMPILER_WITH_PATH)
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endif(NOT _CMAKE_USER_C_COMPILER_PATH)
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endif(NOT CMAKE_C_COMPILER)
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mark_as_advanced(CMAKE_C_COMPILER)
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if (NOT _CMAKE_TOOLCHAIN_LOCATION)
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get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
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endif (NOT _CMAKE_TOOLCHAIN_LOCATION)
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# Build a small source file to identify the compiler.
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if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
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set(CMAKE_C_COMPILER_ID_RUN 1)
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set(CMAKE_C_PLATFORM_ID "Windows")
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set(CMAKE_C_COMPILER_ID "MSVC")
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endif(${CMAKE_GENERATOR} MATCHES "Visual Studio")
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if(NOT CMAKE_C_COMPILER_ID_RUN)
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set(CMAKE_C_COMPILER_ID_RUN 1)
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# Each entry in this list is a set of extra flags to try
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# adding to the compile line to see if it helps produce
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# a valid identification file.
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set(CMAKE_C_COMPILER_ID_TEST_FLAGS
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# Try compiling to an object file only.
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"-c"
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# Try enabling ANSI mode on HP.
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"-Aa"
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)
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# Try to identify the compiler.
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set(CMAKE_C_COMPILER_ID)
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file(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
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CMAKE_C_COMPILER_ID_PLATFORM_CONTENT)
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
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CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
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# Set old compiler and platform id variables.
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if("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
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set(CMAKE_COMPILER_IS_GNUCC 1)
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endif("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
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if("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
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set(CMAKE_COMPILER_IS_MINGW 1)
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elseif("${CMAKE_C_PLATFORM_ID}" MATCHES "Cygwin")
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set(CMAKE_COMPILER_IS_CYGWIN 1)
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endif("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
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endif(NOT CMAKE_C_COMPILER_ID_RUN)
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# If we have a gcc cross compiler, they have usually some prefix, like
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# e.g. powerpc-linux-gcc, arm-elf-gcc or i586-mingw32msvc-gcc, optionally
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# with a 3-component version number at the end (e.g. arm-eabi-gcc-4.5.2).
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# The other tools of the toolchain usually have the same prefix
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# NAME_WE cannot be used since then this test will fail for names lile
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# "arm-unknown-nto-qnx6.3.0-gcc.exe", where BASENAME would be
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# "arm-unknown-nto-qnx6" instead of the correct "arm-unknown-nto-qnx6.3.0-"
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if (CMAKE_CROSSCOMPILING
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AND "${CMAKE_C_COMPILER_ID}" MATCHES "GNU"
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AND NOT _CMAKE_TOOLCHAIN_PREFIX)
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get_filename_component(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME)
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if (COMPILER_BASENAME MATCHES "^(.+-)g?cc(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$")
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set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
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endif (COMPILER_BASENAME MATCHES "^(.+-)g?cc(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$")
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# if "llvm-" is part of the prefix, remove it, since llvm doesn't have its own binutils
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# but uses the regular ar, objcopy, etc. (instead of llvm-objcopy etc.)
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if ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$")
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set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
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endif ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$")
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endif (CMAKE_CROSSCOMPILING
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AND "${CMAKE_C_COMPILER_ID}" MATCHES "GNU"
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AND NOT _CMAKE_TOOLCHAIN_PREFIX)
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include(${CMAKE_ROOT}/Modules/CMakeClDeps.cmake)
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include(CMakeFindBinUtils)
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if(MSVC_C_ARCHITECTURE_ID)
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set(SET_MSVC_C_ARCHITECTURE_ID
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"set(MSVC_C_ARCHITECTURE_ID ${MSVC_C_ARCHITECTURE_ID})")
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endif(MSVC_C_ARCHITECTURE_ID)
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# configure variables set in this file for fast reload later on
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configure_file(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
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"${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake"
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@ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
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)
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set(CMAKE_C_COMPILER_ENV_VAR "CC")
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