diff options
Diffstat (limited to 'Modules/Compiler/Clang-CXX.cmake')
| -rw-r--r-- | Modules/Compiler/Clang-CXX.cmake | 47 |
1 files changed, 42 insertions, 5 deletions
diff --git a/Modules/Compiler/Clang-CXX.cmake b/Modules/Compiler/Clang-CXX.cmake index 77866e9..e99011b 100644 --- a/Modules/Compiler/Clang-CXX.cmake +++ b/Modules/Compiler/Clang-CXX.cmake @@ -51,8 +51,33 @@ if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC") endif() unset(_clang_version_std17) + + __compiler_check_default_language_standard(CXX 2.1 98) +elseif(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.9 + AND CMAKE_CXX_SIMULATE_VERSION VERSION_GREATER_EQUAL 19.0) + # This version of clang-cl and the MSVC version it simulates have + # support for -std: flags. + set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "") + set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "") + set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "") + set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "") + set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std:c++14") + set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std:c++14") + if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 6.0) + set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++17") + set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++17") + set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std:c++latest") + set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std:c++latest") + else() + set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++latest") + set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++latest") + endif() + + __compiler_check_default_language_standard(CXX 3.9 14) else() - # clang-cl does not know these options because it behaves like cl.exe + # This version of clang-cl, or the MSVC version it simulates, does not have + # language standards. Set these options as empty strings so the feature + # test infrastructure can at least check to see if they are defined. set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "") set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "") set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "") @@ -63,10 +88,22 @@ else() set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "") set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "") set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "") -endif() -if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC") - __compiler_check_default_language_standard(CXX 2.1 98) -else() + # There is no meaningful default for this set(CMAKE_CXX_STANDARD_DEFAULT "") + + # There are no compiler modes so we only need to test features once. + # Override the default macro for this special case. Pretend that + # all language standards are available so that at least compilation + # can be attempted. + macro(cmake_record_cxx_compile_features) + list(APPEND CMAKE_CXX_COMPILE_FEATURES + cxx_std_98 + cxx_std_11 + cxx_std_14 + cxx_std_17 + cxx_std_20 + ) + _record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES) + endmacro() endif() |