thanks a lot! Greetings Tim Dave Seaman wrote: > On 3 Jul 2006 03:24:36 -0700, silversurfer wrote: > > so there is no possibility to do this? > > You can make your primary target depend on a phony target that clears the > screen. > > $ cat Makefile > all: clearscreen main > > main:main.o $(ADDOBJS) > @g++ -o main $(LDFLAGS) $+ > > .PHONY: clearscreen > > clearscreen: > clear > > $ make -n all > clear > g++ -c -o main.o main.cc > g++ -o main main.o > > > > > 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/> > > > > -- > Dave Seaman > U.S. Court of Appeals to review three issues > concerning case of Mumia Abu-Jamal. > <http://www.mumia2000.org/>
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