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Re: crash on MacOSX

From: Liang Wang
Subject: Re: crash on MacOSX
Date: Sun, 19 Aug 2012 11:13:04 +0800

On Sun, Aug 19, 2012 at 9:40 AM, Alp Aker <address@hidden> wrote:
>> This bug is not always reproducible when I debug it inside gdb.
> [...]
>> There are two ways to work around this bug.  One is to revert r109641
> [...]
>> I'm not sure if it is related to this patch directly.  Since, the
>> other way is to compile nsfont.m with -g3 -O0.
> [..]
>> I tried ./configure --with-ns CC=clang LD=clang.  And then I don't see
>> this problem.  It could be a compiler bug.
> One problem with r109641 that *might* explain your observations is
> that it introduced code that initialized a static string using a char
> array that wasn't null terminated.  This would result in the string's
> containing an unexpected number of extra characters (possibly
> non-ascii, as well), but the number and identity of the unexpected
> chars would vary between emacs instances. Compiling with -g3 -O0,
> however, leads to the same extra chars appearing in the string across
> different invocations of emacs, and when compiling with Clang the
> string has only the expected characters.
> This might not explain the exception you're seeing (there are likely
> other issues with 109641; e.g., the #ifdef NS_IMPL_COCOA portion of
> ns_ascii_average_width is, I'm fairly sure, incorrect, but I haven't
> sorted out yet what the correct thing for it to do is).  But please
> try building 109677 and see if that fixes the problem for you.

Yes, I started emacs several times successfully.  Thank you.


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