cygwin : Linker doesn't find shared library - cygwin

Question

I am creating an exe and shared library in cygwin.
The library is created and is in the proper place, but when I try to compile the client code daemon, the linking phase says that it can't find the sysutil library.
Error is posted below:
/usr/lib/gcc/i686-pc-cygwin/5.4.0/../../../../i686-pc-cygwin/bin/ld: cannot find -lsysutil
collect2: error: ld returned 1 exit status
make: *** [Makefile:84: daemon] Error 1
I tried exporting the path using LD_LIBRARY_PATH but unfortunately that also didn't help.
daemon.c
#include <stdio.h>
#include <sys_util.h>
int main(){
sys_util();
while(1){
}
return 0;
}
sysutil.c
#include <stdio.h>
#include "sys_util.h"
int sys_util(){
return 0;
}
sysutil.h
int sys_util();
test.bat
g++ -fpic -c sysutil.c
g++ -shared -o libsysutil.so sysutil.o -I.
g++ -c daemon.c -I.
g++ -o daemon.exe daemon.o -L. -lsysutil
del *.o
Shared library is generated sysutil.so in the folder c:/test same as the source code (daemon.c,sysutil.c,sys_util.h,test.bat,libsysutil.so)
Cygwin console output:
/cygdrive/c/test
$ ./test.bat
C:\test>g++ -fpic -c sysutil.c
sysutil.c:1:0: warning: -fpic ignored for target (all code is position independent)
C:\test>g++ -shared -o libsysutil.so sysutil.o -I.
C:\test>g++ -c daemon.c -I.
C:\test>g++ -o daemon.exe daemon.o -L. -lsysutil
c:/mingw/bin/../lib/gcc/mingw32/5.3.0/../../../../mingw32/bin/ld.exe: cannot find -lsysutil
collect2.exe: error: ld returned 1 exit status
C:\test>del *.o

Answer 1

Cygwin expects shared libraries to have the .dll extension.
Change the second line in your batch file to:
g++ -shared -o sysutil.dll sysutil.o -I.
See the users' guide for more info:
https://cygwin.com/cygwin-ug-net/dll.html