Re: makefile automatic variables question

[Paul Smith]

On Sun, 2010-07-11 at 20:02 -0700, tronix wrote:
> % : %.o
>       echo "First line\n"
>       gcc $< -o $@    
> 
> 
> # %.o : %.c
> #     echo "This is second line\n"
> #     gcc -c $<
> 
> .PHONY : clean
> clean :
>       -rm -f $(EXEC) $(OBJS)
> 
> With the lines that are commented I'm not providing any rule to make the
> object files. Hence when I execute make I expected this to give me error,

> does make "know" howto get .o files even with out specifying.

Yes.  See the section "Catalog of Implicit Rules" in the GNU make
manual.

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