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Re: libgmalloc problem

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Re: libgmalloc problem

Subject: Re: libgmalloc problem
From: Terry Lambert <email@hidden>
Date: Thu, 1 Nov 2007 13:48:23 -0700

On Nov 1, 2007, at 5:16 AM, Martin Mitas wrote:

Hi all.

Hopefully this is the right list to report this problem.

To debug our SW, we try to use libgmalloc, as described here:
http://developer.apple.com/technotes/tn2004/tn2124.html
However we encountered troubles with libgmalloc. The following
simple program is good enough to demonstrate it.


[ ... ]

$ gcc -O2 -fomit-frame-pointer problem.c
$ DYLD_INSERT_LIBRARIES=/usr/lib/libgmalloc.dylib ./a.out foo bar
Allocations will be placed on word (4 byte) boundaries.
- Small buffer overruns may not be noticed.
- Applications using AltiVec instructions may fail.
GuardMalloc-11
Segmentation fault (core dumped)

GNU Malloc's alignment boundaries are insufficiently stringent for floating pint register spills, which happen when autovectorization happens (which is enable in the compiler by default), or when explicitly using floating point.

-- Terry
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Re: libgmalloc problem
From: Eric Albert <email@hidden>


References:  
  >libgmalloc problem (From: "Martin Mitas" <email@hidden>)




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