Re: clear command in makefile..

[silversurfer]

so there is no possibility to do this?


Dave Seaman wrote:
> On 1 Jul 2006 09:37:59 -0700, silversurfer wrote:
> > Hello world,
> > I was just wondering why the clear-line in my Makefile does not work:
>
> > main:main.o $(ADDOBJS)
> >          clear
> >          @g++ -o main $(LDFLAGS) $+
>
>
>
> > As far as I understood it, it should be possible to add multiple
> > shell-commands.. Nevertheless, this does compile the files, but the
> > 'clear' before does not work..
>
> > Anyone knows why?
>
> > PS I would like to use this because I like having a clean screen with
> > the actual errors on it.. for me, it is easier... ;)
>
> The "clear" command actually does work, but it's not necessarily the
> first thing that gets generated when you run "make".  It only gets
> generated when that particular rule is applied, and that rule is not what
> causes the program to be compiled.
>
> You can type "make -n" to have the generated sequence of commands echoed
> to the screen without being executed.
>
> If you have, say, a main.cc file plus a Makefile containing exactly those
> three lines quoted above, you will see the following:
>
> $ make -n
> g++    -c -o main.o main.cc
> clear
> g++ -o main  main.o
>
>
> The reason for this is that you didn't actually specify a compile command
> in your Makefile, but only a link command.  You said "main" depends on
> "main.o", but you didn't give a rule for generating "main.o".  The "make"
> program supplied the compile command for you from its implicit rulebase,
> thus generating "main.o" for you.  Once the prerequisite (main.o) was
> satisfied, "make" was able to proceed by applying your rule for the
> link step.
>
>
> --
> Dave Seaman
> U.S. Court of Appeals to review three issues
> concerning case of Mumia Abu-Jamal.
> <http://www.mumia2000.org/>