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Date:	Sat, 16 Dec 2006 13:03:53 -0500
From:	"andy wang" <ypwangreg AT gmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: how to compile the .so to allow extern functions
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Done:-), thank Brain for the help!

$ cat bug1.c
//this will be .so and will call an extern func1() in the main proc
int func1();
int myfunc()
{
  printf("in myfunc.so\n");
  func1();
}


$ cat bug1-main.c
#include <dlfcn.h>

int func1()
{
  printf("in main.func1()\n");
  return 0;
}
int main()
{
  int (*mf)();
  void *handle = dlopen("bug1.so", RTLD_LAZY);
  if(handle) {
    mf = dlsym(handle, "myfunc");
    if(mf) mf();
    dlclose(handle);
  }
  return 0;
}


$ gcc -shared -o bug1-main.so bug1-main.c -ldl -Wl,--out-implib=libmain.dll.a
Creating library file: libmain.dll.a


$ gcc -shared -o bug1.so bug1.c  -L. -lmain


$ gcc -o bug1-main bug1-main.c -ldl


$ ./bug1-main.exe
in myfunc.so
in main.func1()

Regards,
Andy

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