Re: {Spam?} Windows DLLs from Unix with minimum effort

[Vincent Torri]

Hey,

On Mon, 29 Oct 2007, Jason Curl wrote:

> Hello,
>
> Normally I write software for Posix like operating systems, but to 
> assist somebody I'm writing a Windows DLL that I'd like to later use the 
> source for in my Posix application without having to maintain two code 
> bases.
>
> I'm using
> ./configure CC="gcc -mno-cygwin" LDFLAGS="-Wl,--kill-at" 
> --target=i586-pc-mingw32 --disable-static
> on Cygwin to generate the Windows DLL
>
> For each function I want to export I'm using:
> #define LIBAPI __stdcall __declspec(dllexport)
> LIBAPI type_t my_func(int param1, int param2);
>
> I'd like to use uncomplicated names so it can be used in VB6.0 for 
> example, which is why I use LDFLAGS. I can probably use a DEF file, but 
> I'm not clear how to implement libtool/automake/autoconf so that the DEF 
> file is used only for Windows, or better yet, automatically generated.
>
> The library compiles under Windows (I haven't tested the binary yet against any 
> module).
>
> I have also another subdirectory that tests the library but I can't link 
> to it using mingw. First it doesn't recognise that the name was 
> simplified >(it looks for address@hidden for example instead of _my_func/my_func).
>
> When I remove the LDFLAGS option, I instead get a different error:
> /bin/sh ../../libtool --tag=CC   --mode=link gcc -mno-cygwin  -O0 -Wall   -o 
> chartest.exe chartest.o test.o ../src/libmofo.la
> mkdir .libs
> gcc -mno-cygwin -O0 -Wall -o .libs/chartest.exe chartest.o test.o  
> ../src/.libs/libmofo.dll.a  -L/usr/local/lib
> creating chartest.exe
> ./.libs/lt-chartest.c: In function `main':
> ./.libs/lt-chartest.c:113: warning: passing arg 2 of `execv' from incompatible 
> pointer type

To create a dll, with an autotooled library, I add

-no-undefined to the

foo_la_LDFLAGS variable in the Makefile.am (I use MSYS/MinGW).

To create a def file, see for example http://www.mingw.org/docs.shtml

regards

Vincent Torri