From: "A. Sinan Unur" <asu1 AT cornell DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: error: undefined reference
Date: Wed, 23 Jul 1997 12:36:15 -0400
Organization: Cornell University
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Ivan-Mark Debono wrote:
> 
> I have renamed the TILE, SPRITE and MAP to .C files instead of .H 
> files. The compiler already has the -c directive, but now 2 other 
> errors occur:
> Error: gcc.exe: bwmaped.o: linker input file unused since linking not
> done
> Error: gcc.exe: -lalleg: linker input file unused since linking not 
> done

please do not hesitate to read files called README.1ST. it is actuually
not an april fool's day joke.

once you compile individual *.c files in to *.o files, you link them.
i.e.:

gcc -c one.c
gcc -c other.c
gcc -c another.c

then

gcc one.o other.o another.o -o myexe.exe -lalleg

ok?

  -- Sinan


> 
> Can anybody help???
> 
> Andrew Crabtree wrote:
> >
> > > I'm coding a map editor and I have decided to split my routines into
> > > smaller files. This is the list of the current files:
> > >
> > > - BWMAPED.C   (Main program)
> > > - DATASTRT.H  (Various constants and data structures)
> > > - TILE.H      (Tile routines)
> > > - SPRITE.H    (Sprite routines)
> > > - MAP.H               (Map routines)
> > > bwmaped.c(101) Error: undefined reference to 'IMD_new_map'
> > >
> >
> > As a general rule of thumb, only put the following in header files.
> >
> > Macros
> > Defines
> > Function Prototypes
> > Struct declarations
> > Externs
> >
> > Do NOT put in anything like this
> >
> > Variable Declaration
> > Functions themselves.
> >
> > When splitting up files make multiple .c files, with corresponding
> > .h files describing the interface if needed, to functions and variables.
> > Compile the .c files with the -c option to stop at .o phase.  Then,
> > link them all together at once.