is_function_cxx_11.hpp(102): error C3193: '__clrcall': requires '/clr' or '/ZW' command line option about type_traits

[jzmaddock]

If you look at the offending code you will see:

#ifdef __CLR_VER
   template <class Ret, class...Args BOOST_TT_NOEXCEPT_PARAM>
   struct is_function<Ret __clrcall(Args...)BOOST_TT_NOEXCEPT_DECL> : public true_type {};
#endif

And the docs for __CLR_VER say:

"__CLR_VER Defined as an integer literal that represents the version of the Common Language Runtime (CLR) used to compile the app. The value is encoded in the form Mmmbbbbb, where M is the major version of the runtime, mm is the minor version of the runtime, and bbbbb is the build number. __CLR_VER is defined if the /clr compiler option is set. Otherwise, undefined."

See https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2019

So it looks to me like you have a stray #define in your project settings somewhere? Certainly __CLR_VER should not be defined if you're building a native application. In fact since it's a compiler predefine, it should never be set on the command line.

[Riadela]

Yeah, you are right, I've just found out there are 2 files that uses the /clr option, yet they're not using any of the boost libraries ..

[Riadela]

I solved it by undefining __CLR_VER in the files that were trying to include Boost