54 lines
1.5 KiB
CMake
54 lines
1.5 KiB
CMake
# C++14 feature support detection
|
|
|
|
include(CheckCXXCompilerFlag)
|
|
function (fmt_check_cxx_compiler_flag flag result)
|
|
if (NOT MSVC)
|
|
check_cxx_compiler_flag("${flag}" ${result})
|
|
endif ()
|
|
endfunction ()
|
|
|
|
if (NOT CMAKE_CXX_STANDARD)
|
|
set(CMAKE_CXX_STANDARD 11)
|
|
endif()
|
|
message(STATUS "CXX_STANDARD: ${CMAKE_CXX_STANDARD}")
|
|
|
|
if (CMAKE_CXX_STANDARD EQUAL 20)
|
|
fmt_check_cxx_compiler_flag(-std=c++20 has_std_20_flag)
|
|
fmt_check_cxx_compiler_flag(-std=c++2a has_std_2a_flag)
|
|
|
|
if (has_std_20_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++20)
|
|
elseif (has_std_2a_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++2a)
|
|
endif ()
|
|
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 17)
|
|
fmt_check_cxx_compiler_flag(-std=c++17 has_std_17_flag)
|
|
fmt_check_cxx_compiler_flag(-std=c++1z has_std_1z_flag)
|
|
|
|
if (has_std_17_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++17)
|
|
elseif (has_std_1z_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++1z)
|
|
endif ()
|
|
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 14)
|
|
fmt_check_cxx_compiler_flag(-std=c++14 has_std_14_flag)
|
|
fmt_check_cxx_compiler_flag(-std=c++1y has_std_1y_flag)
|
|
|
|
if (has_std_14_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++14)
|
|
elseif (has_std_1y_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++1y)
|
|
endif ()
|
|
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 11)
|
|
fmt_check_cxx_compiler_flag(-std=c++11 has_std_11_flag)
|
|
fmt_check_cxx_compiler_flag(-std=c++0x has_std_0x_flag)
|
|
|
|
if (has_std_11_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++11)
|
|
elseif (has_std_0x_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++0x)
|
|
endif ()
|
|
endif ()
|