obs-studio/cmake/Modules/FindCXX11.cmake

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# - Finds if the compiler has C++11 support
# This module can be used to detect compiler flags for using C++11, and checks
# a small subset of the language.
#
# The following variables are set:
# CXX11_FLAGS - flags to add to the CXX compiler for C++11 support
# CXX11_FOUND - true if the compiler supports C++11
#
if(CXX11_FLAGS)
set(CXX11_FOUND TRUE)
return()
endif()
include(CheckCXXSourceCompiles)
if(MSVC)
set(CXX11_FLAG_CANDIDATES
" "
)
else()
set(CXX11_FLAG_CANDIDATES
#gcc
"-std=gnu++11"
"-std=gnu++0x"
#Gnu and Intel Linux
"-std=c++11"
"-std=c++0x"
#Microsoft Visual Studio, and everything that automatically accepts C++11
" "
#Intel windows
"/Qstd=c++11"
"/Qstd=c++0x"
)
endif()
set(CXX11_TEST_SOURCE
"
int main()
{
int n[] = {4,7,6,1,2};
int r;
auto f = [&](int j) { r = j; };
for (auto i : n)
f(i);
return 0;
}
")
foreach(FLAG ${CXX11_FLAG_CANDIDATES})
set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${FLAG}")
unset(CXX11_FLAG_DETECTED CACHE)
message(STATUS "Try C++11 flag = [${FLAG}]")
check_cxx_source_compiles("${CXX11_TEST_SOURCE}" CXX11_FLAG_DETECTED)
set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
if(CXX11_FLAG_DETECTED)
set(CXX11_FLAGS_INTERNAL "${FLAG}")
break()
endif(CXX11_FLAG_DETECTED)
endforeach(FLAG ${CXX11_FLAG_CANDIDATES})
set(CXX11_FLAGS "${CXX11_FLAGS_INTERNAL}" CACHE STRING "C++11 Flags")
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(CXX11 DEFAULT_MSG CXX11_FLAGS)
mark_as_advanced(CXX11_FLAGS)