Re: [Mingw-users] Comparing function pointers from symbolfor a function exported by a dll

[Brian D. <br...@de...>]

Rich Collins wrote:

> When I change over to using dllspec, I get a bunch of errors like:

It's spelled declspec.

> gcc -o _build/binaries/io_static.exe _build/objs/main.o ../_build/lib/
> libiovmall.a
> _build/objs/main.o: In function `main':
> /home/Customer/io/tools/source/main.c:36: undefined reference to
> `__imp__IoState_new'
> /home/Customer/io/tools/source/main.c:40: undefined reference to
> `__imp__IoState_init'
> /home/Customer/io/tools/source/main.c:41: undefined reference to
> `__imp__IoState_argc_argv_'
> /home/Customer/io/tools/source/main.c:42: undefined reference to
> `__imp__IoState_runCLI'
> /home/Customer/io/tools/source/main.c:43: undefined reference to
> `__imp__IoState_exitResult'
> /home/Customer/io/tools/source/main.c:51: undefined reference to
> `__imp__IoState_free'

You're calling a function that was declared dllimport, but you're
linking with a static library.  That won't work.

> The build script creates a dll and static version.  I don't have to
> compile 2 different object files, one with dllspec and one without,
> do I?

Yes, you do.  Otherwise, it's back to living with thunks that can't be
compared (and a very slight performance hit due to an extra indirect
jump.)

Brian