diff options
Diffstat (limited to 'src/fmt/support/cmake/cxx14.cmake')
| -rw-r--r-- | src/fmt/support/cmake/cxx14.cmake | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/fmt/support/cmake/cxx14.cmake b/src/fmt/support/cmake/cxx14.cmake new file mode 100644 index 000000000..deb1e26fb --- /dev/null +++ b/src/fmt/support/cmake/cxx14.cmake @@ -0,0 +1,54 @@ +# 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 () |