forked from openkylin/vc
131 lines
5.1 KiB
CMake
131 lines
5.1 KiB
CMake
# - Add a given compiler flag to flags variables.
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# AddCompilerFlag(<flag> [<var>])
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# or
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# AddCompilerFlag(<flag> [C_FLAGS <var>] [CXX_FLAGS <var>] [C_RESULT <var>]
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# [CXX_RESULT <var>])
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#=============================================================================
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# Copyright 2010-2015 Matthias Kretz <kretz@kde.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# * Neither the names of contributing organizations nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#=============================================================================
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get_filename_component(_currentDir "${CMAKE_CURRENT_LIST_FILE}" PATH)
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include("${_currentDir}/CheckCCompilerFlag.cmake")
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include("${_currentDir}/CheckCXXCompilerFlag.cmake")
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macro(AddCompilerFlag _flag)
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string(REGEX REPLACE "[-.+/:= ]" "_" _flag_esc "${_flag}")
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set(_c_flags "CMAKE_C_FLAGS")
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set(_cxx_flags "CMAKE_CXX_FLAGS")
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set(_c_result tmp)
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set(_cxx_result tmp)
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if(${ARGC} EQUAL 2)
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message(WARNING "Deprecated use of the AddCompilerFlag macro.")
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unset(_c_result)
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set(_cxx_result ${ARGV1})
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elseif(${ARGC} GREATER 2)
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set(state 0)
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unset(_c_flags)
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unset(_cxx_flags)
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unset(_c_result)
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unset(_cxx_result)
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foreach(_arg ${ARGN})
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if("x${_arg}" STREQUAL "xC_FLAGS")
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set(state 1)
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if(NOT DEFINED _c_result)
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set(_c_result tmp0)
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endif()
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elseif("x${_arg}" STREQUAL "xCXX_FLAGS")
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set(state 2)
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if(NOT DEFINED _cxx_result)
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set(_cxx_result tmp1)
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endif()
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elseif("x${_arg}" STREQUAL "xC_RESULT")
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set(state 3)
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elseif("x${_arg}" STREQUAL "xCXX_RESULT")
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set(state 4)
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elseif(state EQUAL 1)
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set(_c_flags "${_arg}")
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elseif(state EQUAL 2)
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set(_cxx_flags "${_arg}")
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elseif(state EQUAL 3)
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set(_c_result "${_arg}")
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elseif(state EQUAL 4)
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set(_cxx_result "${_arg}")
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else()
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message(FATAL_ERROR "Syntax error for AddCompilerFlag")
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endif()
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endforeach()
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endif()
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set(_c_code "int main() { return 0; }")
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set(_cxx_code "int main() { return 0; }")
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if("${_flag}" STREQUAL "-mfma")
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# Compiling with FMA3 support may fail only at the assembler level.
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# In that case we need to have such an instruction in the test code
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set(_c_code "#include <immintrin.h>
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__m128 foo(__m128 x) { return _mm_fmadd_ps(x, x, x); }
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int main() { return 0; }")
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set(_cxx_code "${_c_code}")
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elseif("${_flag}" STREQUAL "-stdlib=libc++")
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# Compiling with libc++ not only requires a compiler that understands it, but also
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# the libc++ headers itself
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set(_cxx_code "#include <iostream>
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#include <cstdio>
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int main() { return 0; }")
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else()
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set(_cxx_code "#include <cstdio>
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int main() { return 0; }")
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endif()
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if(DEFINED _c_result)
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check_c_compiler_flag("${_flag}" check_c_compiler_flag_${_flag_esc} "${_c_code}")
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set(${_c_result} ${check_c_compiler_flag_${_flag_esc}})
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endif()
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if(DEFINED _cxx_result)
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check_cxx_compiler_flag("${_flag}" check_cxx_compiler_flag_${_flag_esc} "${_cxx_code}")
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set(${_cxx_result} ${check_cxx_compiler_flag_${_flag_esc}})
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endif()
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macro(my_append _list _flag _special)
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if("x${_list}" STREQUAL "x${_special}")
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set(${_list} "${${_list}} ${_flag}")
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else()
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list(APPEND ${_list} "${_flag}")
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endif()
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endmacro()
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if(check_c_compiler_flag_${_flag_esc} AND DEFINED _c_flags)
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my_append(${_c_flags} "${_flag}" CMAKE_C_FLAGS)
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endif()
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if(check_cxx_compiler_flag_${_flag_esc} AND DEFINED _cxx_flags)
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my_append(${_cxx_flags} "${_flag}" CMAKE_CXX_FLAGS)
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endif()
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endmacro(AddCompilerFlag)
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