On Tue, 4 Apr 2006, Jung-uk Kim wrote:
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.
I think this is wrong for a SINGLE QUOTED argument to be passed
to awk. The Makefile is wrong. I am right.
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 $$3 }' \
/usr/include/osreldate.h
.else
OSRELDATE= 0
.endif
.endif
all:
@echo "reldate = ${OSRELDATE}"
------------
and run make. You will see something like this (depending on your
header file):
%make
reldate = 600034
But it doesn't
[1;42;37mTue Apr 04 17:11:38 bash3.1:ttyp0:eighner
goodwill~$[0mmake -V OSRELDATE -f /usr/src/Makefile.inc1
0
[1;42;37mTue Apr 04 17:12:25 bash3.1:ttyp0:eighner
goodwill~$[0mexit
exit
where /usr/include/osreldate.h =
/*-
* Copyright (c) 1992-2006 The FreeBSD Project.
* All rights reserved.
<snippage>
* SUCH DAMAGE.
*
*/
#ifdef _KERNEL
#error "<osreldate.h> cannot be used in the kernel, use <sys/param.h>"
#else
#undef __FreeBSD_version
#define __FreeBSD_version 504105
#endif
Also is there a difference when the accent mark is used in front
instead of a real single quote?
Where do you see it?
Where you wrote:
$ A single dollar sign `$', i.e. `$$' expands to a single
dollar sign.
And also in man make. The ` is an accent key, not a quote key.
Yes, they are aka backticks and do mean something when they are
paired, but `something' is nonsense so far as I can tell.
Why would make tamper with anything in single quotes that is
passed to a command? How do you write an argument for a command
so that make won't tamper with it? What would double quoting
the argument be for?
--
Lars Eighner
[EMAIL PROTECTED] [EMAIL PROTECTED]
http://www.larseighner.com/index.html
8800 N IH35 APT 1191 AUSTIN TX 78753-5266
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