Re: Building GNUstep for Windows using Clang

> Am 02.12.2020 um 20:20 schrieb David Chisnall <[email protected]>:
> 
> It looks as if the code to check which personality function is outside the runtime-specific code.  The attached diff should fix that.

FYI these are the linker errors after building Clang with this patch added also:

> lld-link: error: undefined symbol: __CxxFrameHandler3
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:(.xdata)
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:(.xdata)
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:($ip2state$_c_GSHTTPAuthentication__authenticationWithCredential_inProtectionSpace_)
> >>> referenced 258 more times
> 
> lld-link: error: undefined symbol: vtable for __cxxabiv1::__class_type_info
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:(typeinfo for NSObject)
> >>> referenced by obj/libgnustep-base.obj/GSTimSort.m.o
> >>> referenced by obj/libgnustep-base.obj/GSTLS.m.o
> 
> lld-link: error: undefined symbol: vtable for __cxxabiv1::__si_class_type_info
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:(typeinfo for NSException)
> >>> referenced by obj/libgnustep-base.obj/GSTimSort.m.o
> >>> referenced by obj/libgnustep-base.obj/GSTLS.m.o
> 
> lld-link: error: undefined symbol: vtable for __cxxabiv1::__pointer_type_info
> >>> referenced by obj/libgnustep-base.obj/GSHTTPAuthentication.m.o:(typeinfo for NSException*)
> >>> referenced by obj/libgnustep-base.obj/GSTimSort.m.o
> >>> referenced by obj/libgnustep-base.obj/GSTLS.m.o


For now I might try disabling native exceptions (which looks like will require some changes in Make as it assumes libobjc2 supports them) to keep moving towards a Clang build of GNUstep on Windows.

That being said, it would be great to get a better idea of what needs to be done to get exception handling working with MinGW (in Clang and/or libobjc2). We’d be happy to support or sponsor required work in any way we can.

In the meantime, if there’s anything else I can try so we can get a better picture just let me know. :)

Thanks!
Frederik