Date: Thu, 18 Apr 2002 07:10:03 -0700 (PDT) From: Ruslan Ermilov <ru@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/37224: make: $< only set for implicit rules Message-ID: <200204181410.g3IEA3r22544@freefall.freebsd.org>
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The following reply was made to PR bin/37224; it has been noted by GNATS.
From: Ruslan Ermilov <ru@FreeBSD.org>
To: Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at>
Cc: bug-followup@FreeBSD.org
Subject: Re: bin/37224: make: $< only set for implicit rules
Date: Thu, 18 Apr 2002 17:06:57 +0300
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On Thu, Apr 18, 2002 at 01:23:18PM +0200, Gerald Pfeifer wrote:
>=20
> .c.o:
> echo $<
>=20
> foo: bar.c
> echo $<
>=20
>=20
> Specifically, 'make bar.o' prints bar.c, as expected, while 'make foo'
> prints the empty string (as $< has not been set).
>=20
> GNU make prints bar.c in both cases, and also my reading of
> IEEE Std 1003.1-2001 indicates that make(1) is incorrect here.
>=20
No, POSIX.1-2001 requests the $< to be defined in the "inference" rules,
i.e., .c.o type of rules. For "target" rules, like "foo: bar.c" above,
it should be undefined:
: $< In an inference rule, the $< macro shall evaluate to the
: filename whose existence allowed the inference rule to be
: chosen for the target. In the .DEFAULT rule, the $< macro
: shall evaluate to the current target name. The meaning of
: the $< macro shall be otherwise unspecified. For example,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
: in the .c.a inference rule, $< represents the prerequisite
: .c file.
I think this PR can be closed.
Cheers,
--=20
Ruslan Ermilov Sysadmin and DBA,
ru@sunbay.com Sunbay Software AG,
ru@FreeBSD.org FreeBSD committer,
+380.652.512.251 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
http://www.oracle.com Enabling The Information Age
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