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Date: Mon, 11 Jul 2005 16:14:42 -0700 (PDT)
Message-Id: <200507112314.j6BNEgp0014484@lymeon.ucdavis.edu>
To: cygwin AT cygwin DOT com
Subject: Re: How to add 4K of scratch space at the bottom of the stack    using C instead of C++?
From: "Yu-Cheng Chou" <cycchou AT ucdavis DOT edu>
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> > I have module.dll that was created by using command line "gcc -shared
> > -o module.dll module.c" in cygwin.
> > When I run "msvc-cygload -v -cygwin module.dll" in cygwin, error
> > messages listed below occurred.
 
> Why are you using cygload to load something that isn't cygwin1.dll?

Hi, Max:

Originally, I got two files, main.c and module.c

// main.c
#include <stdio.h>
#include <windows.h>

int main(){
   void *handle;
   int (*fp)();
   char *modname = "./module.dll";
 
   handle = LoadLibrary(modname);
   if (handle == NULL) {
      fprintf(stderr, "Can't load %s in LoadLibrary()\n", modname);
      exit(1);
   }
   fp = (int (*)())GetProcAddress((HMODULE)handle, "foo");
   if (fp== NULL) {
      fprintf(stderr, "ERROR: GetProcAddress()\n");
      exit(1);
   }
   fp();
   FreeLibrary((HMODULE)handle);
}

// module.c
#include <stdio.h>
#include <windows.h>

int foo(int arg){
   printf("foo() called\n");
   return (arg * 2);
}

I used "cl -c main.c" and "cl /o main.exe main.obj" to create main.exe.
I used "gcc -shared -o module.dll module.c" to create module.dll.
module.dll will be invoked in main.exe. However, when I run main.exe, the 
program just hung there.

So, my question is in an executable program that was created by MSVC, how 
to dynamically load a library (module.dll) that was created by cygwin's 
gcc?

Some users suggested that I load cygwin1.dll before module.dll because 
module.dll might be related to cygwin1.dll.
module.dll will only be created by cygwin's gcc, but I'm not sure if I did 
it in the correct way using "gcc -shared -o module.dll module.c".

I have been working on this for a while, but still can't figure out how to 
make it work.

Could you help me with this?

Thanks   

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