how to compile the .so to allow extern functions

["andy wang" <ypwangreg at gmail dot com>]

Hi,  All

I want to compile a .so which contains extern function that may be
defined on the main program.
The following file can be compiled on linux without any problem but
how to compile it on cygwin?

$ 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");
 func1();
}

$ gcc -o bug1.so -shared bug1.c
/cygdrive/c/DOCUME~1/Flyiky/LOCALS~1/Temp/ccBB7v0l.o:
bug1.c:(.text+0x13): undefined reference to `_func1'
collect2: ld returned 1 exit status

Thanks in advance!

Regards,
Andy

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