1 # This file is part of lyx.
3 # The module comes from the enblend project, slightly modified.
5 # Check if compiler supports C++11 features
6 # and which compiler switches are necessary
7 # CXX11_FLAG : contains the necessary compiler flag
10 # Copyright (c) 2013 Thomas Modes <tmodes@@users.sourceforge.net>
12 # Redistribution and use in source and binary forms, with or without
13 # modification, are permitted provided that the following conditions
16 # 1. Redistributions of source code must retain the copyright
17 # notice, this list of conditions and the following disclaimer.
18 # 2. Redistributions in binary form must reproduce the copyright
19 # notice, this list of conditions and the following disclaimer in the
20 # documentation and/or other materials provided with the distribution.
21 # 3. The name of the author may not be used to endorse or promote products
22 # derived from this software without specific prior written permission.
24 # This file is distributed in the hope that it will be useful,
25 # but WITHOUT ANY WARRANTY; without even the implied warranty of
26 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 # GNU General Public License for more details.
29 # You should have received a copy of the GNU General Public License
30 # along with lyx; if not, write to the Free Software
31 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 INCLUDE(CheckCXXSourceCompiles)
35 INCLUDE(FindPackageHandleStandardArgs)
37 # get cmake-known std numbers
38 # Detection of c++20 works well, but our code is not ready for it yet.
39 # We currently get errors with internal boost and also from our code.
41 lyxgetknowncmakestd(${_max_std_num} tmpnums)
43 if (CMAKE_CXX_COMPILER_ID MATCHES "^([cC]lang|AppleClang)$")
44 foreach(_num ${tmpnums})
45 list(APPEND CXX11_FLAG_CANDIDATES "--std=c++${_num} -Wno-deprecated-register")
49 foreach(_num ${tmpnums})
50 list(APPEND CXX11_FLAG_CANDIDATES "--std=gnu++${_num}")
54 # MSVC does not have a general C++11 flag, one can only switch off
55 # MS extensions with /Za in general or by extension with /Zc.
56 # Use an empty flag to ensure that CXX11_STD_REGEX is correctly set.
57 if (MSVC_VERSION LESS 1926)
58 set(CXX11_FLAG_CANDIDATES "noflagneeded")
60 foreach(_num ${tmpnums})
61 list(APPEND CXX11_FLAG_CANDIDATES "/std:c++${_num}")
63 list(APPEND CXX11_FLAG_CANDIDATES "noflagneeded")
66 set(CXX11_FLAG_CANDIDATES)
67 foreach(_num ${tmpnums})
68 list(APPEND CXX11_FLAG_CANDIDATES "--std=c++${_num}")
74 # sample openmp source code to test
80 static_assert(sizeof(int) <= sizeof(T), \"not big enough\");
83 typedef check<check<bool>> right_angle_brackets;
88 TestDeleted() = delete;
95 typedef check<int> check_type;
97 check_type&& cr = static_cast<check_type&&>(c);
106 # The following code snipped taken from example in http://stackoverflow.com/questions/8561850/compile-stdregex-iterator-with-gcc
107 set(REGEX_TEST_SOURCE
114 typedef std::regex_iterator<const char *> Myiter;
117 const char *pat = \"axayaz\";
118 Myiter::regex_type rx(\"a\");
119 Myiter next(pat, pat + strlen(pat), rx);
127 set(SAFE_CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET})
128 set(CMAKE_REQUIRED_QUIET ON)
129 SET(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
130 FOREACH(FLAG ${CXX11_FLAG_CANDIDATES})
131 IF("${FLAG}" STREQUAL "noflagneeded")
132 UNSET(CMAKE_REQUIRED_FLAGS)
134 SET(CMAKE_REQUIRED_FLAGS "${FLAG}")
136 UNSET(CXX11_FLAG_DETECTED CACHE)
137 CHECK_CXX_SOURCE_COMPILES("${CXX11_TEST_SOURCE}" CXX11_FLAG_DETECTED)
138 IF(CXX11_FLAG_DETECTED)
139 SET(CXX11_FLAG "${FLAG}")
140 message(STATUS "CXX11_FLAG_DETECTED = \"${FLAG}\"")
142 check_cxx_source_compiles("${REGEX_TEST_SOURCE}" CXX_STD_REGEX_DETECTED)
143 if (CXX_STD_REGEX_DETECTED)
144 message(STATUS "Compiler supports std_regex")
145 set(CXX11_STD_REGEX ON)
147 message(STATUS "Compiler does not support std_regex")
148 set(CXX11_STD_REGEX OFF)
153 SET(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
154 set(CMAKE_REQUIRED_QUIET ${SAFE_CMAKE_REQUIRED_QUIET})
156 # handle the standard arguments for find_package
157 FIND_PACKAGE_HANDLE_STANDARD_ARGS(CXX11Compiler DEFAULT_MSG CXX11_FLAG)
158 IF("${CXX11_FLAG}" STREQUAL "noflagneeded")
162 MARK_AS_ADVANCED(CXX11_FLAG CXX11_STD_REGEX)