[mythtv] Myth doesn't compile under FC3

[Jarod Wilson]

On Tuesday 09 November 2004 13:43, Chris Petersen wrote:
> Trying to compile myth under fc3, and I get the following error:
>
> i386/dsputil_mmx.c: In function `h263_h_loop_filter_mmx':
> i386/dsputil_mmx.c:634: error: can't find a register in class
> `GENERAL_REGS' while reloading `asm'
>
> Googling reveals that some people on the atrpms list have had this
> problem.

Yup. Primarily me and Axel.

> It looks like things compile fine for athlon (which is fine 
> for me until I decide to upgrade my main mythbox)

It compiles fine for athlon for me, but the frontend won't load:

$ mythfrontend
2004-10-26 23:28:01 mythfrontend version: 0.16.20040906-1 www.mythtv.org
2004-10-26 23:28:01 Enabled verbose msgs : important general
2004-10-26 23:28:02 Registering Internal as a media playback plugin.
2004-10-26 23:28:02 Registering MythDVD DVD Media Handler as a media handler
2004-10-26 23:28:02 Registering MythDVD VCD Media Handler as a media handler
terminate called after throwing an instance of 'std::bad_alloc'
  what():  St9bad_alloc
Aborted

Granted, this was a week or two ago on my mutant FC2.5 box, so it may work 
better under straight FC3. Just got a pure FC3 box installed last night, so 
I'll try again sometime soon...

> but this could be a 
> real problem for intel-cpu users.

I believe it can be made to work by hacking around Red Hat's optimization 
flags. (Primarily, remove the -mtune=pentium4 part).

> My guess is that is has something to do with the new gcc's more strict
> C++ handling.

I believe its primarily the optflags, at least in the case of i686 and i386 
builds. Not sure yet what's up with athlon builds. 
From /usr/lib/rpm/redhat/rpmrc (part of the redhat-rpm-config package):

optflags: i386 %{__global_cflags} -m32 -march=i386 -mtune=pentium4
optflags: i486 %{__global_cflags} -m32 -march=i486
optflags: i586 %{__global_cflags} -m32 -march=i586
optflags: i686 %{__global_cflags} -m32 -march=i686 -mtune=pentium4
optflags: athlon %{__global_cflags} -m32 -march=athlon

> Anyway, a warning to prospective fc3 updaters, and a bug report for the
> devs.

I plan to hack /usr/lib/rpm/redhat/rpmrc a bit later to see if I can get a 
fully functional rpm build. I'm guessing Myth isn't at fault, per se, since 
Myth doesn't officially support some of those optflags, IIRC.

-- 
Jarod C. Wilson, RHCE
jcw at wilsonet.com

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