[mythtv] [mythtv-commits] Ticket #10542: configure incorrectly detects VIA c3 and enables cmov etc...

Michael T. Dean mtdean at thirdcontact.com
Wed Apr 4 14:46:42 UTC 2012

On 04/03/2012 06:41 PM, MythTV wrote:
> #10542: configure incorrectly detects VIA c3 and enables cmov etc...
> -------------------------------+--------------------------------------
>   Reporter:  andrew@…           |           Type:  Bug Report - General
>     Status:  new                |       Priority:  minor
> Milestone:  0.24.3             |      Component:  MythTV - General
>    Version:  0.24.2             |       Severity:  medium
>   Keywords:  c3 cmov configure  |  Ticket locked:  0
> -------------------------------+--------------------------------------
>   On gentoo using the media-tv/mythtv-0.24.2_p20120315 ebuild ./configure
>   uses --enable-proc-opt which incorrectly assumes that my Ezra CPU has cmov
>   extensions etc...
>   When it has compiled the binary crashes with 'illegal instruction' trying
>   to run mythtv-setup
>   Attempting to work around this by passing --tune=c3 --arch=i586 --enable-
>   mmx --enable-amd3dnow --enable-memalign-hack --disable-sse --disable-ssse3
>   --disable-amd3dnowext --cpu=c3 etc....
>   Seems this bug appeared 5 years ago and was squashed - but it seems to
>   have come back.

Andrew and/or Simon,

Please do a make distclean and run configure with only:

./configure --enable-proc-opt 2>&1 | tee $HOME/configure_output.txt

and do:

cat /proc/cpuinfo > $HOME/cpuinfo.txt

and then send me a copy of cpuinfo.txt (please attach the file--don't 
copy/paste), configure_output.txt, and (in the mythtv source directory), 
config.ep.  We should be handling Via Ezra, now, so either your cpuinfo 
has some strangeness in it or there's breakage elsewhere in the script 
that undoes our checks.


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