Re: Undefined References

[Michael Sullivan <michael@espersunited.com>]

On Sat, 2007-12-01 at 06:22 -0600, Tom Browder wrote:
> On Dec 1, 2007 5:31 AM, Michael Sullivan <michael@espersunited.com> wrote:
> > On Fri, 2007-11-30 at 22:43 -0600, Tom Browder wrote:
> > > On Nov 30, 2007 10:28 PM, Michael Sullivan <michael@espersunited.com> wrote:
> > > >
> > > > On Fri, 2007-11-30 at 22:01 -0600, Tom Browder wrote:
> > > > > On Nov 30, 2007 7:26 PM, Michael Sullivan <michael@espersunited.com> wrote:
> > > > > > I'm having trouble building my project.  This is my first project I've
> > > > > > worked on that uses make, so I'm having a lot of problems with it.
> > > > > > Here's my Makefile:
> ...
> > > > In file included from battle.cpp:4:
> > > > /usr/local/include/SDL/SDL_gfxPrimitives.h:17:17: error: SDL.h: No such
> > > > file or directory
> > >
> > > You may need the -I (hyphen uppercase i) option to tell gcc where to
> > > find SDL.h.  For instance:
> 
> Look carefully at the gcc manual and the options to g++, the '-I'
> option, which may be used multiple times, gives a path to search for
> include files.
> 
> Now, I can't help the warning at the moment, but the show stoppers are
> the undefined references which are probably defined in the missing
> libraries you asked for on the line:
> 
> LIBS=`sdl-config --cflags --libs` -lSDL_image -lSDL_gfx -lSDL_ttf
> 
> You probably need to add one or more '-L' options which you use to
> tell gcc where to find libraries (for details, see the gcc manual).
> 
> -Tom
> 
> Tom Browder
> Niceville, Florida
> USA

Actually now, and I find this very strange; I rm *.o and run 'make all'
and it gives me this output:
battle.cpp: In member function 'SDL_Surface* battle::drawString(int,
int, char*)':
battle.cpp:72: warning: missing initializer for member
'SDL_Color::unused'
rm: cannot remove `*~': No such file or directory
make: *** [battle.o] Error 1

but battle.o is created.  character.o is not.  The second time I run
make all, both character.o and battle.o exist.  The third time I run
make all, it gives me the following errors:

battle.o: In function `battle::battle()':
battle.cpp:(.text+0x9e3): undefined reference to
`Character::Character()'
battle.cpp:(.text+0xb35): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0xb83): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0xbd1): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0xc16): undefined reference to
`Character::~Character()'
battle.o: In function `battle::battle()':
battle.cpp:(.text+0xf19): undefined reference to
`Character::Character()'
battle.cpp:(.text+0x106b): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0x10b9): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0x1107): undefined reference to
`Character::~Character()'
battle.cpp:(.text+0x114c): undefined reference to
`Character::~Character()'
character.o: In function `Character::Character(char*, long, long)':
character.cpp:(.text+0xdb): undefined reference to `vtable for
Character'
character.o: In function `Character::Character(char*, long, long)':
character.cpp:(.text+0x12d): undefined reference to `vtable for
Character'
collect2: ld returned 1 exit status
rm: cannot remove `*~': No such file or directory
make: *** [all] Error 1

Once again, here is my current Makefile:

CC=g++
CFLAGS=-W -Wall -pedantic
LIBS=`sdl-config --cflags --libs` -lSDL_image -lSDL_gfx -lSDL_ttf

character.o: character.cpp
	reset; $(CC) $(CFLAGS) -c character.cpp;rm *~

battle.o: battle.cpp
	reset; $(CC) $(CFLAGS) -c battle.cpp -I/usr/include/SDL/; rm *~

all: battle.o character.o
	reset; $(CC) $(CFLAGS) battle.o character.o $(LIBS) -o battle; rm *~

Is it normal for only portions of make all to run at a time?