[w3m-dev-en 00282] Re: gcc -O2 in Linux

From: Brandon D. Valentine (bandix@looksharp.net)
Date: Mon Nov 13 2000 - 16:37:50 CST

  • Next message: Moritz Barsnick: "[w3m-dev-en 00283] Re: gcc -O2 in Linux"

    On Mon, 13 Nov 2000, Ambrose Li wrote:

    >Hi,
    >
    >I have recently noticed a very strange thing. On my two Linux boxes
    >(egcs 2.90.29 on i486 and gcc 2.8.2 on my broken armv4l box), w3m
    >will segfault when certain web pages are viewed if it is compiled
    >with -O2, but will not segfault if it is compiled with just -O.
    >I do not see this behaviour on Solaris (gcc 2.95.2 on SunOS 5.7,
    >Sparc hardware).

    Patient: "This hurts."
    Doctor: "Don't do that."

    Honestly there is not much that can be done about it. GCC is
    notoriously bad about optimization bugs, especially since development
    focus in the more recent GCCs has shifted toward the egcs merge and away
    from luxuries like an optimizer. It's more than likely a gcc problem.
    That's of course the best guess I can make based on your lack of a trace
    or dump. There's little point in compiling w3m with -O2 anyway. It
    just builds bigger binaries, and with an application this simple would
    you rather optimize a few cpu cycles or a few bytes of memory? 

    -- 
Brandon D. Valentine <bandix@looksharp.net>
"Few things are harder to put up with than the annoyance of a
good example."  --  Mark Twain, Pudd'nhead Wilson

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