MythTV won't recompile: how to proceed?

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

This post refers to a new Gentoo installation I've been working on for the past few weeks--the first installation of Gentoo I've ever performed. I've been at GNU/Linux for a few years, but am quite new to Gentoo. The OS was chosen to serve mainly as a base on which to run MythTV.

I've had my share of issues getting the system up and running. But I did get a good deal of what I wanted more or less functional, including MythTV. I got confused about some issues in the early stages of running the OS and began to think I had picked the wrong profile: I decided that, instead of selecting the desktop profile for the initial installation, I should have selected the no-multilib profile. I therefore decided to switch profiles from desktop to no-multilib--something I now think was a mistake.

After having switched profiles to no-multilib, while trying to get MythTV fully functional, I realized that I had not enabled one important flag, and that this was why one of my three tuner cards could not be set up under MythTV. But on setting that flag and trying to recompile MythTV, I discovered it would no longer compile: I believe the compile may be failing due to a Gentoo bug (you can read about my attempts to compile in the threads https://forums.gentoo.org/viewtopic-t-1013668.html and https://forums.gentoo.org/viewtopic-t-914500.html and about the suspected bug at https://bugs.gentoo.org/500446 )

So I'm now trying to determine how to proceed. I can think of three possible avenues, which I'll list here in order, from most desirable to least desirable:

I know how to do 3) but don't want to waste all the time and effort I've put into this project thus far. I have a vague conception of how to do 2), which I might actually be able to pull off using directions from sites like https://guymann.github.io/2013/02/11/32bit-gentoo/ and http://jkroon.blogs.uls.co.za/it/gentoo/gentoo-converting-no-multilib-to-multilib. Option 1) is most desirable, but given my lack of technical expertise, especially in connection with this distro, I am at a loss as to what else I might try in order to get MythTV to recompile. Someone was trying to render some assistance in the thread https://forums.gentoo.org/viewtopic-t-914500.html , but none of his suggestions seemed to be working. Then he stopped responding, leading me to believe that perhaps he was out of ideas as to what we might try further.

I would appreciate any input on the dilemma with which I'm faced. Can anyone offer any advice on how I might accomplish 1) from my list? If not, does my supposition that switching back from no-multilib might be the most promising avenue for getting MythTV to compile again, seem sound? Input will be appreciated.

PS Briefly, the compile fails at not finding either va/va_glx.h or va/va_x11.h

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

To add a bit more information, here is the tail end of the most recent compilation failure:

Jaglover · Posted: Mon Apr 06, 2015 8:17 pm Post subject:

Will it build with -vaapi ? And, when troubleshooting, I'd recommend using MAKEOPTS=-j1.
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jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Thanks for your suggestion, Jaglover. I guess I'm ready to try just about anything since I seem to be totally stuck at the moment. I suppose I could test your suggestion by just using a command like

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

I finally have some good news to report on the compilation front. The command

Jaglover · Posted: Tue Apr 07, 2015 9:08 am Post subject:

Do you have vaapi enabled globally? What Intel card do you have? Now you have mythtv installed and have nothing to lose, try with vaapi and MAKEOPTS=-j1, will it build?
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jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Thanks for your further input, Jaglover. I do have vaapi among my USE= flags in make.conf, yes. I also have there VIDEO_CARDS="intel i915," which indicates what video hardware this machine has. I did try, before the successful build, the command

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Like I suspected would happen, I get the same old compilation failure when I run

danomac · Posted: Sun Jan 03, 2016 2:45 am Post subject:

Add 'dummy' to your VIDEO_CARDS in make.conf, e.g.:

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Thanks for following up on this, danomac. But I have to report that your solution did not work for me. I added "dummy" to the relevant entry in make.conf. Then I removed -vaapi from /etc/portage/package.use/mythtv and tried to recompile mythtv. The build errored out in the same fashion as it had previously and that I posted about in my Tue Apr 07, 2015 11:49 am post. Recall, incidentally, that I am using the no-multilib profile.

I tried to confirm that mythtv would still compile as it had been previously, removing the dummy entry from make.conf and re-adding -vaapi in the relevant spot. But compilation is now failing on a different error. I'm still trying to diagnose this new issue and may post about it in a separate thread.

danomac · Posted: Fri Jan 08, 2016 7:57 pm Post subject:

Ahh, OK. I am on a multilib profile and had that exact same error. I probably found this thread while searching for a solution. Eventually I figured it out and was able to solve it like I'd posted.

What I mention still is true, before adding 'dummy' to VIDEO_CARDS I had no 'va_glx.h' installed on my system at all. I do have the vaapi USE-flag globally set as I do want the hw acceleration. I wonder if I should report a bug?

Edit: Did you emerge world? One of the VAAPI packages needs to be rebuilt before installing mythtv. I think it was x11-libx/libva...

Edit2: I just checked and I see that I had to emerge libva with abi_x86_32. Which really doesn't help in your situation.

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

I ran emerge --update --newuse --deep --with-bdeps=y @world. Since I've been at this while simultaneously attending to a few other things I was not absolutely certain I'd done things in the right order. I decided it couldn't really hurt to run that command again, so I once again ran it and, sure enough, libva-1.3.1 did wind up rebuilding. So I might as well have another shot at recompiling mythtv. I'll post results after this additional test.

danomac · Posted: Fri Jan 08, 2016 8:53 pm Post subject:

After libva rebuilds itself with the 'dummy' video card, see if /usr/include/x86_64-pc-linux-gnu/va/va_glx.h exists. If it does, then try compiling mythtv. Or just search /usr for va_glx.h to make sure it's there somewhere.

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Still fails, but now with a different error. I do not find any va_glx.h on this system (using either locate or find / -name). Here's the tail end of output on failure:

danomac · Posted: Fri Jan 08, 2016 11:29 pm Post subject:

I don't see any errors just warnings. The error must be further up in the log.

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

I should've cat'd the log and examined/posted more of the end. Turns out it's probably the same failure on not finding va_glx.h:

Tony0945 · Posted: Sat Jan 09, 2016 2:26 am Post subject:

I have MythTV up and running on one of my boxes. There is no va_glx.h I am running the desktop profile, which is a multilib profile. My video cards are
VIDEO_CARDS="nouveau fbdev v4l vesa modesetting"

If someone has MythTV and a va_glx.h, would they please post the output of "equery b va_glx.h" so we know what package it belongs to, then we can analyze better than taking random shots in the dark.

My use flags:

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

danomac · Posted: Sat Jan 09, 2016 6:46 am Post subject:

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

find /usr -iname va_glx.h returns no results on this (no-multilib) system. emerge -pv libva mythtv returns results very similar to yours, danomac:

danomac · Posted: Sat Jan 09, 2016 6:47 pm Post subject:

Before giving up try building libva with opengl support. Glx is an opengl backend and I would speculate it is needed. You will probably want to set that flag globally and rebuild all affected packages before trying to recompile mythtv.

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Your last suggestion looks like it might actually resolve this issue, danomac. I set the opengl flag globally and ran emerge --update --newuse --deep --with-bdeps=y @world. After libva-1.3.1 had finished re-compiling, running find /usr -iname va_glx.h gave me encouraging results:

danomac · Posted: Sun Jan 10, 2016 4:56 pm Post subject:

That's great news. It sounds like everything will build fine now.

If it does wind up working a bug should be filed for mythtv - media-tv/mythtv +vaapi requires x11-libs/libva +opengl.

jamtat · Apprentice Joined: 09 Aug 2003 Posts: 162

Analyzing this failure is proving to be a bit over my head. The only thing I could think of that might be revealing was to grep the build log for the word "failed." So, here's the output from that (from cat build.log | grep -B 2 -A 2 failed, to be precise) in case it might be revealing:

Tony0945 · Posted: Mon Jan 11, 2016 1:11 am Post subject:

Post the results of "emerge -pev mythtv|grep ebuild | grep N" Be sure to include the p for pretend. On my server it wanted to build 436 packages, six of which were new. Look for [ebuild N ] for a new package. I'm not entirely sure how to read the output. I think R is for a straight rebuild and r is for a rebuild with different flags but I'm not sure. You could also run "revdep-rebuild" to rebuild libraries as needed because it looks like myth can't find a label in a library. Supposedly, revdep-rebuild isn't required anymore, but it seems to have helped me in the past. it can't hurt.