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Date:	Thu, 7 Oct 2010 15:52:33 +0200
Subject:	Simple Cygwin Application Linking Problem
From:	=?utf-8?B?IE1pY2hhZWwgSsOkZ2Vy?= <Michael DOT Jaeger AT hs-owl DOT de>
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Hello,

I=E2=80=99m pretty new to this whole Cygwin stuff and I have a problem buil=
ding an application to an executable.

So let=E2=80=99s start with my little c program.

#include <test.h>


int main (void){


      printf("Hello World");
      test();
      return 0;
=20=20=20=20=20=20
}

int test(void){

      return 0;
}
My header file is pretty simple and looks like this.

int main(void);
int test();

I just included it for screwing around with makefiles and using files that =
are not in the same directory, so that I had to work with path declarations.

My makefile looks as follows:

#INCLUDES ABSOLUTE
INCNETSNMPABS     =3D C:/cygwin/home/MJaeger/net-snmp-5.5/include=20=20=20
INCCYGSTDABS      =3D C:/cygwin/usr/include=20=20=20=20=20=20=20=20=20=20=
=20=20=20

#INCLUDES RELATIVE TO MAKEFILE=20
SOURCEHEADERREL   =3D ../Headers/

#INCLUDE HEADER COMPILATION
HCOMP             =3D -I$(INCNETSNMPABS) -I$(INCCYGSTDABS) -I$(SOURCEHEADER=
REL)


#SOURCES RELATIVE TO MAKEFILE
SOURCEFILEREL           =3D ../Source/test.c


#LIBRARIES ABSOLUTE
LIBNETSNMPABS     =3D C:/cygwin/home/MJaeger/net-snmp-5.5/snmplib/
LIBCYGW32APIABS   =3D C:/cygwin/lib/w32api
LIBCYGSTDABS      =3D C:/cygwin/usr/include/d/3.4.4/std/c
LIBCYGDLLABS      =3D C:/cygwin/bin

#LINKER LIBRARY COMPILATION
LCOMP =3D -L $(LIBNETSNMPABS) -L $(LIBCYGW32APIABS) -L $(LIBCYGSTDABS) -L $=
(LIBCYGDLLABS)=20=20


target.o: $(SOURCEFILEREL) $(SOURCEHEADERREL)/test.h
      gcc -o target.o $(HCOMP) -c $(SOURCEFILEREL)=20=20
=20=20=20=20=20=20



test.exe: target.o
      ld $(LCOMP) target.o



When calling make target.o, no error occurs. The file is created and everyt=
hing seems fine. But when I=E2=80=99m calling make test.exe the following e=
rror occurs:

target.o:test.c(.text+0x12): undefined reference to =E2=80=98__main=E2=80=
=99
target.o:test.c(.text+0x1e): undefined reference to =E2=80=98printf=E2=80=
=99
make: *** [test.exe] Error 1

As I said I=E2=80=99m pretty new to this Cygwin stuff and I=E2=80=99m also =
new to writing makefiles, that=E2=80=99s why I just want to create a simple=
 example.

To me it seems that the linker does not know enough library files.=20
Another problem is of course, since I=E2=80=99m not so familiar with this s=
tuff, I=E2=80=99m not even sure what to search for, so maybe someone can pr=
ovide me with new knowledge or give me some hints so that I know in which t=
opic, or sub topic I have to gain more knowledge.

Cheers and regards
Michael

=20

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