RE: [Mingw-users] Re: Generic DLL questions

[Danny S. <dan...@cl...>]

> -----Original Message-----
> From:  Stefan Bellon
> Sent: Thursday, November 03, 2005 9:58 AM
> 
> 
> Danny Smith wrote:
> > Don't you have to hardcode this into a pragma in Ada?
> 
> > pragma Linker_Options ("-out-implib libfoo.a");
> 
> No, the -Wl,--out-implib,libfoo.a is indeed passed to the linker. But
> it looks like it only has an effect if (in C) functions have been 
> marked with __declspec(dllexport).

As alternative you could provide a main.def file as linker input to
specify the dllexports from your main.exe, eg 
;main.def
NAME main.exe
EXPORTS
  from_main


Or add -Wl,--export-all.  

The other way is to not bother with an import lib for main.exe but
specify yout imports from main in a def file for the dll build, eg 

;dll.def
LIBRARY my_dll.dll
RXPORTS
  foo
  doo
  dah
IMPORTS
; [ <internal-name> = ] <module-name> . <external-name>
  from_main = main.exe.from_main



when building dll,  add dll.def to input files

gcc -shared -omy_dll.dll -Wl,--out-implib,libmy_dll.dll.a   dll.def
dllmod.o 


This way is actually simpler.  Since the def file will resolve the
imports from main, you could build the dll and its implib at same time,
rather thn chase circular dependencies between main and the dll

Unfortunately the use of IMPORTS statement is not well documented and I
do not think it is compatible with MSVC

Danny

And 
> Ada doesn't (to my knowledge) have an equivalent and therefore no
> import library is created. :-(
> 
> --
> Stefan Bellon
>