Date: Thu, 3 Aug 2000 13:52:41 +0200 From: Neil Blakey-Milner <nbm@mithrandr.moria.org> To: Sheldon Hearn <sheldonh@uunet.co.za> Cc: hackers@FreeBSD.org Subject: Re: Berkeley make: evaluations inside for loops Message-ID: <20000803135241.A46679@mithrandr.moria.org> In-Reply-To: <76800.965302263@axl.ops.uunet.co.za>; from sheldonh@uunet.co.za on Thu, Aug 03, 2000 at 01:31:03PM %2B0200 References: <76800.965302263@axl.ops.uunet.co.za>
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On Thu 2000-08-03 (13:31), Sheldon Hearn wrote:
> Can anyone explain to me why the first Makefile works and yet the second
> Makefile doesn't? The second Makefile produces the following error
> messages on ``make test''
>
> | "Makefile", line 1: Malformed conditional (widget == ${BAZ})
> | "Makefile", line 1: Need an operator
> | "Makefile", line 3: if-less endif
> | "Makefile", line 3: Need an operator
> | "Makefile", line 9: Need an operator
> | make: fatal errors encountered -- cannot continue
>
> #Makefile1:
> FOO= widget
> BAZ= widget
> BAR=
> .if ${FOO} == ${BAZ}
> BAR= equal
> .endif
>
> test:
> echo BAR=${BAR}
>
> #Makefile2:
> BAZ= widget
> .for FOO in ${BAZ}
> .if ${FOO} == ${BAZ}
> BAR= equal
> .endif
> .endfor
>
> test:
> echo BAR=${BAR}
Makefile2 expands to:
BAZ= widget
.if widget == ${BAZ}
BAR= equal
.endif
And '.if' only takes "expressions", which can be comparisons (ie, "!=",
"=="), which in turn must have a variable on the left hand side. (don't
ask me why)
Therefore, you should use:
.if ${BAZ} == ${FOO}
instead.
Neil
--
Neil Blakey-Milner
Sunesi Clinical Systems
nbm@mithrandr.moria.org
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