From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: Can .ads be compiled alone?
Date: Thu, 06 Nov 2014 23:09:03 -0700
Date: 2014-11-06T23:09:03-07:00 [thread overview]
Message-ID: <m3hnlm$f44$2@dont-email.me> (raw)
In-Reply-To: <520f8f3d-b345-4ef8-ac41-ead78edde92a@googlegroups.com>
On 11/06/2014 10:21 PM, moixa wrote:
>
> I have only two files, machinery_1_3.ads [1] and machinery_1_3.adb [2], in
> some directory, when I `gnat compile machinery_1_3.ads`, it told me compile
> error, (but no further information).
>
> A stackoverflow post[3] said that it's a good practice to separate compile
> the spec and the body, so, why I cannot compile my .ads?
This is an idiosyncrasy of GNAT's source-based compilation model. When you
compile something that withs a package, GNAT also looks at the source file for
the pkg spec. So GNAT normally only compiles a pkg body; typically the message
when one tries to compile a spec that has a body is something like "cannot
produce object code for a package specification" (I haven't tried it recently).
You can check a pkg spec that has a body with -gnatc, and compile a spec that
doesn't have a body, or compile a spec along with its body by compiling the body.
Other compilers have other ways of dealing with this, and require that a pkg
spec be compiled before you can compile something that withs it.
--
Jeff Carter
"In the frozen land of Nador they were forced to
eat Robin's minstrels, and there was much rejoicing."
Monty Python & the Holy Grail
70
next prev parent reply other threads:[~2014-11-07 6:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 5:21 Can .ads be compiled alone? moixa
2014-11-07 6:09 ` Jeffrey Carter [this message]
2014-11-07 17:26 ` Robert A Duff
2014-11-07 17:41 ` Jeffrey Carter
2014-11-07 6:20 ` J-P. Rosen
2014-11-07 7:48 ` Chris Moore
2014-11-07 14:54 ` Tero Koskinen
2014-11-07 15:49 ` Björn Lundin
2014-11-07 16:29 ` G.B.
2014-11-08 13:01 ` moixa
2014-11-08 14:55 ` G.B.
2014-11-07 16:29 ` G.B.
2014-11-07 16:44 ` Adam Beneschan
2014-11-07 17:14 ` Shark8
2014-11-08 21:31 ` Chris Moore
2014-11-07 16:50 ` Adam Beneschan
2014-11-07 17:14 ` Robert A Duff
2014-11-08 2:01 ` Randy Brukardt
2014-11-15 12:54 ` rriehle
2014-11-15 19:17 ` Robert A Duff
2014-11-15 19:19 ` Robert A Duff
2014-11-17 15:52 ` Adam Beneschan
2014-11-17 0:07 ` rriehle
2014-11-17 6:50 ` Simon Wright
2014-11-24 3:16 ` rriehle
2014-11-24 6:34 ` Jeffrey Carter
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