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<TITLE>sane-devel: Re: bug in sanei_debug.h</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.de)">
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<META NAME="Subject" CONTENT="Re: bug in sanei_debug.h">
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<H1>Re: bug in sanei_debug.h</H1>
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<!-- received="Tue Oct 17 11:46:49 2000" -->
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<!-- sent="Sun, 15 Oct 2000 21:44:13 +0200" -->
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<!-- name="Henning Meier-Geinitz" -->
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<!-- subject="Re: bug in sanei_debug.h" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20bug%20in%20sanei_debug.h&In-Reply-To=<20001015214413.A315@vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Oct 15 2000 - 12:44:13 PDT
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<LI><STRONG>Previous message:</STRONG> <A HREF="0184.html">Denny Schanze: "Re:access denied"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0158.html">Jochen Eisinger: "Re: bug in sanei_debug.h"</A>
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Hi,
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<BR>
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<P>On Sun, Oct 15, 2000 at 08:13:32PM +0200, Jochen Eisinger wrote:
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<BR>
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<EM>> There's another bug in sanei_debug.h: before we test what value __GNUC__
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</EM><BR>
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<EM>> has, we should test, whether __GNUC__ is defined at all.
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</EM><BR>
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<P>I'm not sure but I think this was done intentionally. The code is:
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<BR>
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<P>#if __GNUC__ - 0 > 2 || (__GNUC__ - 0 == 2 && __GNUC_MINOR__ > 5)
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<BR>
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<P>With __GNUC__ undefined this will expand to
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<BR>
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<P>#if 0 - 0 > 2 || (0 - 0 == 2 && 0 > 5)
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<BR>
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<P>(At least this is what the gnu cpp manual says, I hope this is true for
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<BR>
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other preprocessors).
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<BR>
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<P>I don't know why the code uses __GNUC__ - 0, maybe this is when __GNUC__ is
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<BR>
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defined but empty?
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<BR>
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<P>But you are right that
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<BR>
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<P>#ifdef __GNUC__
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<BR>
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# if __GNUC__ ...
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<BR>
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<P>is easier to understand and maybe more portable (I haven't heard of problems
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<BR>
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on any platform about this line, however). So I think you can change this.
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<BR>
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<P><EM>> I had a look at it. I thought, we could define DBG like this
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> #define DBG sanei_debug_set(DBG_LEVEL, STRINGIFY(BACKEND_NAME));
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</EM><BR>
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<EM>> sanei_debug
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</EM><BR>
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<P>This was my first idea, too.
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<BR>
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<P><EM>> but this fails on code like this
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> if (...)
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</EM><BR>
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<EM>> DBG(...)
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</EM><BR>
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<EM>> else
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</EM><BR>
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<EM>> ...
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</EM><BR>
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<P>Exactly. Probably other persons thought about this problem years ago with no
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<BR>
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result ...
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<BR>
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<P>Bye,
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<BR>
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Henning
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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<LI><STRONG>Next message:</STRONG> <A HREF="0186.html">Henning Meier-Geinitz: "Re: SANE can't see Epson Perfection 1200S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0158.html">Jochen Eisinger: "Re: bug in sanei_debug.h"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0179.html">Petter Reinholdtsen: "Re: bug in sanei_debug.h"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue Oct 17 2000 - 11:47:26 PDT</EM>
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