Yes, sadly. I have this code: if (NOT CMAKE_VERSION VERSION_LESS 3.1) set_property(TARGET osmium_convert PROPERTY CXX_STANDARD 11) target_compile_definitions(osmium_convert PRIVATE $<$<COMPILE_FEATURES:cxx_decltype_incomplete_return_types>:BOOST_RESULT_OF_USE_DECLTYPE>) endif()
So, in theory, this will set the definition if the compiler supports decltype, and just don't set it if not. And it works fine for g++. The problem is when it comes to MSVC: There is no MSVC version that supports this feature properly, so there is no variable for this compiler defined. Or just think of $FooBarC++, where noone cared to report the supported features. No variable either. For these compilers the above expression fails, because this is no recorded feature of the compiler. I would have expected it to just not set the definition, but not error out. So for now my code is: if (NOT CMAKE_VERSION VERSION_LESS 3.1 AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU") ... Greetings, Eike
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