Hi,
I'm trying to migrate our software to mingw and we have multiple (D)COM
interfaces in use.
Right now we use official midl, make some modifications to the generated files,
and compile it with Embarcaderos Compilers (the classic Borland one, and the
newer Clang based one).
For mingw I use msys2.
I did try to run midl using the IDL files and headers from mingw.
The first problem was the __debugbreak function in _mingw.h, but that can be
addressed with some #ifdef'ery.
Then when I try to compile the proxy DLL I get a lot of warnings (have not
looked deeply into them), the error(s) I get are:
'IUnknown_QueryInterface_Proxy' undeclared here (not in a function)
Looking a bit into it, I started adding defines: WIDL_C_INLINE_WRAPPERS and
COBJMACROS, the next problem is:
C:\msys64\mingw32\i686-w64-mingw32\include\unknwnbase.h:152: Error: multiple
storage classes in declaration specifiers
It's from the expansion of FORCEINLINE in C mode.
Compiling the sources as C++ (by renaming them), I get:
C:\msys64\mingw32\i686-w64-mingw32\include\rpcproxy.h:91: Error:
'IRpcStubBufferVtbl' does not name a type; did you mean 'IRpcStubBuffer'?
Then I learned there is widl and tried that. But the generated files are no
good to me:
Error: wine/exception.h: No such file or directory
As far as I can tell, there is no package within msys2 where I could get
wine/exception.h
So now my question is:
How to run generate the proxy DLL for a COM interface with mingw? I'm willing
to put some effort into it, if there are parts missing in mingw.
Mit freundlichen Grüßen
With Best Regards
Björn Schäpers
Entwicklung Systemsoftware
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