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Re: Bus error

From: Eric Blake
Subject: Re: Bus error
Date: Wed, 03 Dec 2008 20:05:17 -0700
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[please don't top-post]

According to Thomas J. Duck on 12/3/2008 7:29 PM:
> Hi Eric,
>      Thanks for your email -- the quickest response to a bug report ever!
>      'locate libsigsegv' turns up nothing.

It doesn't turn up anything for me, either, because it is not an
executable, but a library.  More to the point, you can find out if m4 is
using libsigsegv by inspecting your config.log output.  For example, when
I built a recent development copy of m4, my config.log contains:

configure:7054: checking for libsigsegv
configure:7082: result: yes
configure:7088: checking how to link with libsigsegv
configure:7090: result: -lsigsegv

and further searching turns up /usr/include/sigsegv.h which includes:

#define LIBSIGSEGV_VERSION 0x0204 /* version number: (major<<8) + minor */

so my machine has libsigsegv 2.4 installed (no known bugs when used on
cygwin, but according to the NEWS file, this version is buggy on at least
Mac, BSD, and Linux; 2.6 is the most recent release, but even that still
has bugs on fringe platforms like Irix that are only fixed in CVS libsigsegv).

>      If you have other tests that you would like me to run, please let
> me know.  I'm happy to help where I can.

Are you comfortable using gdb (assuming you have that installed)?  Are you
able to figure out how to run the failing test under gdb such that you can
give a stack trace at the point where the SIGBUS occurred, or would you
like a step-by-step walkthrough?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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