Kenton, I have a suggestion for a solution over on the GitHub issue for this: https://github.com/sandstorm-io/capnproto/issues/284
It involves `#include`ing a preamble and postamble header at the start and end of every public header -- the preamble uses `#pragma push_macro` on problematic defines and the postamble restores them with `#pragma pop_macro`. I stole the idea from Boost.Asio. I know it's gross, but it seems like the most robust solution to me, and allows us to emulate `system_header` behavior. I can submit a PR implementing this idea for consideration in a week or two. Harris On Fri, May 12, 2017 at 6:22 PM, Kenton Varda <[email protected]> wrote: > Hi, > > The problem is that windows.h #defines the symbol VOID. You will either > need to include windows.h after capnp headers, or you will need to #undef > VOID after the include. > > We should probably make this more automatic, or at least provide a better > error message... > > -Kenton > > On May 12, 2017 6:20 PM, <[email protected]> wrote: > >> I'm trying to get Cap'n Proto 0.6.0 compiled as a plugin under >> UnrealEngine 4.13 using Visual Studio 2015 (update 3). I have compiled this >> version under Visual Studio from source. To test, if I create just a plain >> C++ project and use the installed Cap'n headers and libraries I can >> generate test message classes that seem to compile with a few compiler >> warnings. However when compiling an Unreal Project (or a Win32 project) >> with these same classes I get all sorts of strange errors in kj and cap'n >> (common.h, etc.) as it imports the header files. My best guess is that it >> has something to do with the precompiled headers in those environments? >> Does anyone have a clue or have any advice using Cap'n Proto under Unreal >> Engine/ Windows? >> >> Example of the errors: >> >> thirdparty\capnproto\include\capnp\common.h(64): error C2628: >> 'capnp::Void' followed by 'void' is illegal (did you forget a ';'?) >> thirdparty\capnproto\include\capnp\common.h(64): error C2513: >> 'capnp::Void': no variable declared before '=' >> thirdparty\capnproto\include\capnp\common.h(96): error C2062: type >> 'void' unexpected >> thirdparty\capnproto\include\capnp\common.h(106): error C2143: syntax >> error: missing ';' before '}' >> thirdparty\capnproto\include\capnp\common.h(130): error C2065: 'Void': >> undeclared identifier >> thirdparty\capnproto\include\capnp\common.h(130): error C2923: >> '_::Kind_': 'Void' is not a valid template type argument for parameter 'T' >> thirdparty\capnproto\include\capnp\common.h(130): error C2913: explicit >> specialization; '_::Kind_' is not a specialization of a class template >> thirdparty\capnproto\include\capnp\common.h(131): error C2913: explicit >> specialization; '_::Kind_' is not a specialization of a class template >> >> I can include these headers in an "empty project" and compile these >> classes fine so I'm not sure what the deal is. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Cap'n Proto" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> Visit this group at https://groups.google.com/group/capnproto. >> > -- > You received this message because you are subscribed to the Google Groups > "Cap'n Proto" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > Visit this group at https://groups.google.com/group/capnproto. > -- You received this message because you are subscribed to the Google Groups "Cap'n Proto" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/capnproto.
