[asterisk-dev] [Code Review] 2760: Add _IO_stdin_used in version-script to fix SIGBUSes on Sparc

[Matt Jordan]

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Ship it!


Ship It!

- Matt Jordan


On Aug. 15, 2013, 8:08 a.m., wdoekes wrote:
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> https://reviewboard.asterisk.org/r/2760/
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> (Updated Aug. 15, 2013, 8:08 a.m.)
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> 
> Review request for Asterisk Developers and jkister.
> 
> 
> Bugs: ASTERISK-21763
>     https://issues.asterisk.org/jira/browse/ASTERISK-21763
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> Repository: Asterisk
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> Description
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> Asterisk was killed by SIGBUSes on Jeremy Kisters' Sparc.
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> One of the problems was that the STDIO file structures were getting misaligned because of some compatibility code.
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> A Mozilla bug report on the Debian tracker provides lots of useful info.
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#94
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> >>> FYI, I found that it is triggered by the _IO_stdin_used symbol
> >>> not being exported from the binary, which happened because of a
> >>> version-script couple with -rdynamic. I still think there is
> >>> something fishy going on on the libc6 side, but not as bad as
> >>> originally thought.
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> >> This seems to be a known and more or less documented behavior of
> >> libc to determine which ABI to use for an application software.
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> > A build process that mangles the export of _IO_stdin_used is (as
> > defined by the libc ABI, even if not explicitly written down)
> > broken.
> 
> 
> I added comments[1] in the asterisk.exports.in file so we wouldn't forget what that strange entry is doing there.
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> [1] http://www.scoberlin.de/content/media/http/informatik/gcc_docs/ld_3.html#SEC7
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> 
> Diffs
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>   /branches/1.8/default.exports 396721 
>   /branches/1.8/main/asterisk.exports.in 396721 
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> Diff: https://reviewboard.asterisk.org/r/2760/diff/
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> Testing
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> See bug reports: ASTERISK-21763 and ASTERISK-21665.
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> Note that this doesn't fix all the problems on the Sparc, but it's a start.
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> 
> Thanks,
> 
> wdoekes
> 
>

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