From: Marius Vollmer <mvo@zagadka.ping.de>
Cc: guile-devel@gnu.org
Subject: Re: snarfer guard macro name decision: SCM_MAGIC_SNARFER
Date: 15 Mar 2002 22:12:05 +0100 [thread overview]
Message-ID: <87zo19lemy.fsf@zagadka.ping.de> (raw)
In-Reply-To: <E16ldwT-0007Yb-00@giblet>
Thien-Thi Nguyen <ttn@giblet.glug.org> writes:
> From: Marius Vollmer <mvo@zagadka.ping.de>
> Date: 14 Mar 2002 20:09:36 +0100
>
> > this is not guaranteed to work; when invoked w/ "foo > out.x", the shell
> > does indeed create out.x first, satisfying most CPPs' requirements for
> > out.x existing to be #included.
>
> Sorry, I was confused. I still am, for that matter. How can it
> happen that during
>
> guile-snarf foo.c >foo.x
>
> the file foo.x does not exist? It should get created by the shell
> before guile-snarf is executed.
Ouch. Boy, I was really really dense here. Of course the actual
command that is run is not "guile-snarf foo.c >foo.x" but
guile-snarf foo.c >foo.tmp.x && mv foo.tmp.x foo.x
No fancy buffer issues or race conditions needed to explain the
lossage... People have been using the #ifdef SCM_MAGIC_SNARFER trick
to work around this, and we need to make that fix work again.
I now also understand why writing to stdout is so bad and why the "-o"
option is so much better. (it's taken a while, sorry Thien-Thi.)
> Yes, but it is still easier not to change existing code that makes use
> of the old behavior of guile-snarf.
>
> here, the code that needs changing is primarily in makefiles, which are
> not as big a pain to update as C source, there being fewer makefiles
> than source files typically.
But it's still easier not to change the snarfing rules. Arguing for
an evil by citing a larger, unrelated evil is not really
convincing. ;-)
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next prev parent reply other threads:[~2002-03-15 21:12 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-13 7:51 snarfer guard macro name decision: SCM_MAGIC_SNARFER Thien-Thi Nguyen
2002-03-13 9:26 ` Thien-Thi Nguyen
2002-03-13 19:15 ` Marius Vollmer
2002-03-13 21:28 ` Thien-Thi Nguyen
2002-03-13 22:00 ` Rob Browning
2002-03-13 22:58 ` Thien-Thi Nguyen
2002-03-14 0:12 ` Thien-Thi Nguyen
2002-03-14 5:44 ` Rob Browning
2002-03-14 18:48 ` Marius Vollmer
2002-03-14 20:44 ` Thien-Thi Nguyen
2002-03-14 23:35 ` Marius Vollmer
2002-03-15 4:26 ` Thien-Thi Nguyen
2002-03-15 15:56 ` Thien-Thi Nguyen
2002-03-15 21:19 ` Marius Vollmer
2002-03-14 5:56 ` Thien-Thi Nguyen
2002-03-14 6:58 ` Rob Browning
2002-03-14 7:17 ` Rob Browning
2002-03-14 9:32 ` Thien-Thi Nguyen
2002-03-14 23:40 ` Marius Vollmer
2002-03-14 19:09 ` Marius Vollmer
2002-03-14 22:43 ` Thien-Thi Nguyen
2002-03-14 23:31 ` Rob Browning
2002-03-15 21:12 ` Marius Vollmer [this message]
2002-03-15 21:33 ` Rob Browning
2002-03-15 21:58 ` Marius Vollmer
2002-03-17 17:07 ` Rob Browning
2002-03-18 0:07 ` Marius Vollmer
2002-03-18 2:52 ` Rob Browning
2002-03-20 21:11 ` Marius Vollmer
2002-03-21 16:23 ` Rob Browning
2002-04-24 20:07 ` Marius Vollmer
2002-04-24 20:42 ` Rob Browning
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