difficulties with MythTV on a MacMini1.1

[Ryan Schmidt]

On Nov 4, 2012, at 15:00, Jim Ham <jimham at dslextreme.com> wrote:

> I'm having trouble getting Myth to compile on my MacMini1.1 (mid 006).  This is an Intel Core Duo machine with 2G RAM and lots of disk space. OSX 10.6.8
> 
> I run the command "sudo port install mythtv-core.25." All goes well until the script tries to install myth itself, then it stops with the message:
> 
> --->  Computing dependencies for mythtv-core.25
> --->  Building mythtv-core.25
> Error: org.macports.build for port mythtv-core.25 returned: command execution failed
> Please see the log file for port mythtv-core.25 for details:
>    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_mythtv-core.25/mythtv-core.25/main.log
> To report a bug, follow the instructions in the guide:
>    http://guide.macports.org/#project.tickets
> Error: Processing of port mythtv-core.25 failed
> 
> I've attached the log. Any suggestions?

The error in the log is:

> :info:build filter_yadif.c: In function ‘filter_line_mmx2’:
> :info:build filter_yadif.c:372: error: can't find a register in class ‘GENERAL_REGS’ while reloading ‘asm’
> :info:build filter_yadif.c:380: error: can't find a register in class ‘GENERAL_REGS’ while reloading ‘asm’
> :info:build filter_yadif.c:372: error: ‘asm’ operand has impossible constraints
> :info:build filter_yadif.c:372: error: ‘asm’ operand has impossible constraints
> :info:build filter_yadif.c:380: error: ‘asm’ operand has impossible constraints
> :info:build filter_yadif.c:380: error: ‘asm’ operand has impossible constraints
> :info:build make[2]: *** [filter_yadif.o] Error 1

It looks like this assembly-language code is not compatible with the processor in your Mac mini. Specifically it looks like the code is trying to use more processor registers than your processor has available. That's according to this page I found with a quick search:

http://stackoverflow.com/questions/8275859/error-cant-find-a-register-in-class-general-regs-while-reloading-asm

Only the first series of Intel Macs used the 32-bit Core processor; all the others use 64-bit processors, and 64-bit Intel processors have a lot more registers.

You should report this problem to the developers of mythtv so they can fix it.

A solution might be to tell mythtv to not use assembly code. I'm not sure what configure arguments might need to be added to do that.