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3c56e7c0eb
The old version with empty flag did not enter the loop at all, so we have to use a workaround. Thanks Uwe for testing.
146 lines
4.1 KiB
CMake
146 lines
4.1 KiB
CMake
# This file is part of lyx.
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#
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# The module comes from the enblend project, slightly modified.
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#
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# Check if compiler supports C++11 features
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# and which compiler switches are necessary
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# CXX11_FLAG : contains the necessary compiler flag
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#
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# Copyright (c) 2013 Thomas Modes <tmodes@@users.sourceforge.net>
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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
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# are met:
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#
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# 1. Redistributions of source code must retain the copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not 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 file is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with lyx; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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INCLUDE(CheckCXXSourceCompiles)
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INCLUDE(FindPackageHandleStandardArgs)
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if (CMAKE_CXX_COMPILER_ID MATCHES "^[cC]lang$")
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set(CXX11_FLAG_CANDIDATES "--std=c++11 -Wno-deprecated-register")
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else()
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if (CYGWIN)
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set(CXX11_FLAG_CANDIDATES "--std=gnu++11")
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else()
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if (MSVC)
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# MSVC does not have a general C++11 flag, one can only switch off
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# MS extensions with /Za in general or by extension with /Zc.
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# Use an empty flag to ensure that CXX11_STD_REGEX is correctly set.
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set(CXX11_FLAG_CANDIDATES "noflagneeded")
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else()
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set(CXX11_FLAG_CANDIDATES
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"--std=c++14"
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"--std=c++11"
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"--std=gnu++11"
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"--std=gnu++0x"
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)
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endif()
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endif()
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endif()
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# sample openmp source code to test
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SET(CXX11_TEST_SOURCE
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"
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template <typename T>
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struct check
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{
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static_assert(sizeof(int) <= sizeof(T), \"not big enough\");
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};
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typedef check<check<bool>> right_angle_brackets;
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class TestDeleted
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{
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public:
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TestDeleted() = delete;
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};
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int a;
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decltype(a) b;
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typedef check<int> check_type;
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check_type c;
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check_type&& cr = static_cast<check_type&&>(c);
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auto d = a;
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int main() {
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return 0;
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};
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")
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# The following code snipped taken from example in http://stackoverflow.com/questions/8561850/compile-stdregex-iterator-with-gcc
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set(REGEX_TEST_SOURCE
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"
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#include <regex>
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#include <iostream>
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#include <string.h>
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typedef std::regex_iterator<const char *> Myiter;
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int main()
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{
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const char *pat = \"axayaz\";
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Myiter::regex_type rx(\"a\");
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Myiter next(pat, pat + strlen(pat), rx);
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Myiter end;
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return (0);
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}
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")
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# check c compiler
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set(SAFE_CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET})
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set(CMAKE_REQUIRED_QUIET ON)
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SET(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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FOREACH(FLAG ${CXX11_FLAG_CANDIDATES})
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IF(NOT "${FLAG}" STREQUAL "noflagneeded")
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SET(CMAKE_REQUIRED_FLAGS "${FLAG}")
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ENDIF()
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UNSET(CXX11_FLAG_DETECTED CACHE)
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CHECK_CXX_SOURCE_COMPILES("${CXX11_TEST_SOURCE}" CXX11_FLAG_DETECTED)
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IF(CXX11_FLAG_DETECTED)
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SET(CXX11_FLAG "${FLAG}")
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message(STATUS "CXX11_FLAG_DETECTED = \"${FLAG}\"")
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set(LYX_USE_CXX11 1)
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check_cxx_source_compiles("${REGEX_TEST_SOURCE}" CXX_STD_REGEX_DETECTED)
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if (CXX_STD_REGEX_DETECTED)
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message(STATUS "Compiler supports std_regex")
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set(CXX11_STD_REGEX ON)
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else()
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message(STATUS "Compiler does not support std_regex")
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set(CXX11_STD_REGEX OFF)
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endif()
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break()
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ENDIF()
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ENDFOREACH()
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SET(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_QUIET ${SAFE_CMAKE_REQUIRED_QUIET})
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# handle the standard arguments for find_package
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(CXX11Compiler DEFAULT_MSG CXX11_FLAG)
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IF("${CXX11_FLAG}" STREQUAL "noflagneeded")
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SET(CXX11_FLAG "")
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ENDIF()
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MARK_AS_ADVANCED(CXX11_FLAG CXX11_STD_REGEX)
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