Date: Tue, 4 Apr 2006 17:52:14 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-stable@FreeBSD.org Cc: Lars Eighner <eighner@io.com> Subject: Re: Is Makefile.inc1 in 6 wrong? Message-ID: <200604041752.15909.jkim@FreeBSD.org> In-Reply-To: <20060404163058.J76542@goodwill.io.com> References: <20060404160100.U76190@goodwill.io.com> <200604041726.17120.jkim@FreeBSD.org> <20060404163058.J76542@goodwill.io.com>
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On Tuesday 04 April 2006 05:32 pm, Lars Eighner wrote:
> On Tue, 4 Apr 2006, Jung-uk Kim wrote:
> > On Tuesday 04 April 2006 05:14 pm, Lars Eighner wrote:
> >> It appears to me that either I have a wrong version of awk or
> >> this Makefile.inc1 is wrong:
> >>
> >> #
> >> # $FreeBSD: src/Makefile.inc1,v 1.499.2.11 2006/04/04 14:24:03
> >> glebius Exp $ #
> >>
> >> <Snippage>
> >>
> >> MAKEOBJDIRPREFIX?= /usr/obj
> >> .if !defined(OSRELDATE)
> >> .if exists(/usr/include/osreldate.h)
> >> OSRELDATE!= awk '/^\#define[[:space:]]*__FreeBSD_version/ {
> >> print $$3 }' \ /usr/include/osreldate.h
> >> .else
> >> OSRELDATE= 0
> >>
> >>
> >> In particular with the double dollar sign in the awk statement,
> >> I get no return, therefore OSRELDATE gets set to 0. The awk
> >> statement also fails from the command line. But if I use only
> >> one $, the awk statement succeeds.
> >>
> >> Is there a reason for the double dollar sign?
> >
> > Yes. See make(1):
> >
> > $ A single dollar sign `$', i.e. `$$' expands to a single
> > dollar sign.
>
> Then why does it get the wrong answer?
Because you ran it from command line. ;-) You can copy and paste the
same lines to *Makefile* like this:
------------
.if !defined(OSRELDATE)
.if exists(/usr/include/osreldate.h)
OSRELDATE!= awk '/^\#define[[:space:]]*__FreeBSD_version/ { print $$3 }' \
/usr/include/osreldate.h
.else
OSRELDATE= 0
.endif
.endif
all:
@echo "reldate = ${OSRELDATE}"
------------
and run make. You will see something like this (depending on your
header file):
%make
reldate = 600034
> Also is there a difference when the accent mark is used in front
> instead of a real single quote?
Where do you see it?
Jung-uk Kim
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