Re: [Mingw-users] Makefile question

[Franco B. <fra...@we...>]

"Robert Landle" <rl...@gd...> schrieb am 29.04.02:
> Hi.
> Below is a copy of a simple makefile which takes advantage of an
> implicit rule.
> file1.cpp is dependent on file2.h which lies in the "C:/anotherdir"
> directory.
> 
> Makefile
> -------------------------------------------
> OBJS = file1.o file2.o
> 
> INCDIR = C:/anotherdir/
> 
> program: $(OBJS)
> 	g++ $(OBJS) -o program
> 
> file1.o:
> 
> file2.o:
> 	g++ -c file2.cpp -I$(INCDIR)
> ---------------------------------------------
> 
> When I compile my program the first time everything works fine.
> If I make a change to file1.cpp save and retype make, the compiler knows
> that file1.cpp is out of date so it recompiles it, then relinks the
> program with the unchanged file2.o. GREAT!
> If I make a change to file2.cpp and retype make, file2.cpp does NOT get
> recompiled and the only thing that happens is a new version of program
> gets linked, with the old file2.o. :(
> 
> What am I doing wrong ? Can I take advantage of an implicit rule, even

Just tell make that file2.o depends on file2.cpp :

file2.o: file2.cpp
 	g++ -c file2.cpp -I$(INCDIR)

Ciao, 
  Franco
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