Re: [PATCH] Don't write directly to a make target ($@).

From: Junio C Hamano <junkio@cox.net>
Date: May 25, 2006, 16:28 UTC
Message-ID: <7vejyixe5g.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <87hd3e5ixw.fsf@rho.meyering.net>

Jim Meyering <jim@meyering.net> writes:

> Otherwise, if make is suspended, or killed with prejudice, or if the
> system crashes, you could be left with an up-to-date, yet corrupt,
> generated file.

Thanks. Maybe you would want a "make clean" target for them too if you do this. I often use $@+ instead of t$@ so that I can say "rm -f *+" there.

Show 8 quoted lines

> @@ -496,37 +496,43 @@ builtin-help.o: common-cmds.h
>  	rm -f $@ && ln git$X $@
>  
>  common-cmds.h: Documentation/git-*.txt
> -	./generate-cmdlist.sh > $@
> +	./generate-cmdlist.sh > t$@
> +	mv t$@ $@
>

IOW, like this:

common-cmds.h: Documentation/git-*.txt
	rm -f $@+ $@
        ./generate-cmdlist.sh > $@+
        mv $@+ $@

clean::
	rm -f *+