Date: Mon, 23 Sep 2002 19:08:55 +0200 From: Roman Neuhauser <neuhauser@bellavista.cz> To: freebsd-hackers@freebsd.org Subject: Re: two make questions Message-ID: <20020923170855.GE30361@freepuppy.bellavista.cz> In-Reply-To: <20020923103554.A21087@newton.issci.ca> References: <20020923133431.GZ30361@freepuppy.bellavista.cz> <20020923095217.O332-100000@april.chuckr.org> <20020923143523.GA30361@freepuppy.bellavista.cz> <20020923150811.GI23343@spc.org> <20020923153516.GC30361@freepuppy.bellavista.cz> <20020923103554.A21087@newton.issci.ca>
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[sent only to Chad by mistake]
# davidc@issci.ca / 2002-09-23 10:35:54 -0600:
> On Mon, Sep 23, 2002 at 05:35:16PM +0200, Roman Neuhauser wrote:
> > > unless you explicitly export things as environment variables,
> > > or set them on a command line when re-invoking Make.
> >
> > i'm not sure what to take of this. consider this makefile:
> >
> > DESTDIR=
> > SOURCES= foo bar baz
> > TARGETS:= ${SOURCES:C;^;${DESTDIR}/;}
> > SRCFILE= ${.TARGET:C,^${DESTDIR}/,,}
> >
> > .BEGIN:
> > @echo "\$${DESTDIR}: ${DESTDIR}"
> > @echo "\$${TARGETS}: ${TARGETS}"
> >
> > all: ${TARGETS}
> >
> > ${TARGETS}: ${SRCFILE}
> > @echo "SRC: ${SRCFILE} -> TGT: ${.TARGET}"
> >
> > .PHONY: all ${TARGETS}
> >
> > roman@freepuppy ~/tmp 1133:0 > make all DESTDIR=/tmp/maketest
> > ${DESTDIR}: /tmp/maketest
> > ${TARGETS}: /foo /bar /baz
> > Graph cycles through /foo
> >
> > Graph cycles through /bar
> >
> > Graph cycles through /baz
> >
> > `all' not remade because of errors.
> > roman@freepuppy ~/tmp 1133:0 >
>
> How about something like this:
>
> #DESTDIR= This overrides the command line setting.
As I said earlier, with DESTDIR= in the Makefile, .BEGIN still
displays the value passed on the command line. These two things
(your statement, and the observed behavior) seem to contradict each
other.
Wait, I know the assignment in my Makefile overrides the commandline
assignment: but only outside targets. I just wanted to point out
that going into a bit more detail can save quite an amount of
confusion. :)
> #DESTDIR?= /my/default might work better?
>
> SOURCES= foo bar baz
> TARGETS:= ${SOURCES:C;^;${DESTDIR}/;}
>
> # Note: SRCFILE is evaluated at startup, which results in "" as .TARGET
> # is not yet defined, and then it is evaluated in each target..
yup, per the man page.
> # Note that DESTDIR will be overriden by the define at the top by the
> # time we get into a target.
i'm not sure i'm reading this right, but if i am, you're saying the
opposite of what i'm seeing: DESTDIR is overriden by the command
line assignment.
[further explanation snipped]
> Good luck, and I hope that helps.
you bet! awesome, thanks!
> > > Nik Clayton mentioned a tool to automatically diagram makefile dependency
> > > graphs by target at the last FreeBSD UKUG meeting, using graphviz, but I
> > > can't recall its name.
> >
> > I'll google, thanks.
>
> Let me know if you find this :)
yeah, i'm aware i don't have much to google for. :)
btw, i'm sure i'll run into other delicate features in pmake. is it
okay for me to continue asking here? questions@ doesn't seem to be
*the* place.
--
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