USE flag problem

paraw · Posted: Sun Oct 16, 2005 7:31 pm Post subject: USE flag problem

Hi. I need some help about a strange thing I found. In my make.conf (or in package.use) I set up some use flags. The issue is that while some of the flags are actually used, some others seem to be completely ignored. For example, I put the sse flag in make.conf, but if I run equery or usetool and check I find that no installed package uses that flag. Moreover, if I do emerge --pretend --update --deep --newuse world, no package is needed to be recompiled, just like if everything was compiled with the right flags. How is it possible? I'm talking, of course, about packages that support those flags (e. g. transcode for the sse flag). By the way, this is the emerge --info output, whence you can see that actually sse and the other flags that give problems are not active. Moreover there are some flags I did NOT set neither in make.conf nor in package.use. I really don't understand how this comes.

saturas · Posted: Sun Oct 16, 2005 8:37 pm Post subject:

the packages have their default (implicit) useflags to see these, use command emerge -vp <package_name>.

the result of this last command is a reunion of the useflags from /etc/make.file, /etc/portage/package.use and the implicit useflags.

maybe your packages that you want to copmpile with a specific useflag have been compiled already with that flag.
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chunderbunny · Posted: Sun Oct 16, 2005 8:46 pm Post subject:

In your make.conf are all the flags listed on the same line? Perhaps you should split the lines up a little, just to make sure

paraw · Posted: Sun Oct 16, 2005 9:14 pm Post subject:

OK... probably I've not been clear enough... look at this

surfmasta · n00b Joined: 23 Jul 2005 Posts: 36

what will say:
USE="sse sse2 mmx" emerge -vp transcode

And like chunderbunny means don't forget the backslashes, cos we cant see them in your first posting. I only can see the lines in your USE separated by enter-strokes.

Genone · Posted: Sun Oct 16, 2005 10:55 pm Post subject:

Those flags are masked on amd64 (as they involve 32 Bit assembly code not working there).

paraw · Posted: Sun Oct 16, 2005 11:22 pm Post subject:

Oh...
So... there IS a reason...

Thanks, didn't know that!
By the way, does that mean that I cannot use those optimizations on my laptop? Is there a way to make them work on AMD64?
Thx again.

Genone · Posted: Mon Oct 17, 2005 1:40 am Post subject:

Genone · Posted: Mon Oct 17, 2005 1:42 am Post subject:

squeegee · n00b Joined: 04 Nov 2005 Posts: 10

Well,

USE="X 3dnow avi dv dvdread encode truetype gtk imagemagick jpeg lzo mjpeg mpeg mmx ogg vorbis quicktime sdl sse sse2 sse3 xvid xml2" emerge -vp transcode

on my box (an X2 3800+) gives

[ebuild R ] media-video/transcode-0.6.14-r2 (-3dnow) +X -a52 (-altivec) +avi -dv +dvdread +encode -fame +gtk +imagemagick +jpeg +lzo* +mjpeg* (-mmx) +mpeg -network +ogg (-pvm) +quicktime +sdl (-sse) (-sse2) -theora +truetype -v4l +vorbis +xml2 +xvid 0 kB

transcode takes more than twice as long to encode a file on this box as it does on another box I have with a 3GHz P4

[EDIT] I found out where these flags are masked - in a parent profile of the profile I'm using, specifically for me in

/usr/portage/profiles/default-linux/use.mask

the relevant portion from this file:

# x86/amd64 only:
mmx
mmx2
sse
sse2
3dnow
3dnowext

the problem is that these use flags are not unmasked in the amd64-specific use.mask files.

d0wn_under · Posted: Wed Nov 16, 2005 9:04 pm Post subject:

kallamej · Posted: Thu Nov 17, 2005 11:47 am Post subject:

d0wn_under · Posted: Thu Nov 17, 2005 12:01 pm Post subject:

Do you mean that some packages which can use these flags are using them by default and ignoring the USE flags? If so then is there anyway to tell if the package, e.g. xorg is using the flag, e.g. 3dnow?
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kallamej · Posted: Thu Nov 17, 2005 12:15 pm Post subject:

d0wn_under · Posted: Thu Nov 17, 2005 12:37 pm Post subject:

That makes sense.

Is there any easy way to find which packages have the values hardcoded so that when you do an emerge -pv xorg and it shows that it will ignore the 3dnow flags that it could say that even though it is ignoring the USE flag it is actually hardcoding the values in.
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kallamej · Posted: Thu Nov 17, 2005 12:56 pm Post subject:

Other than looking in the ebuild, not that I know of.
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d0wn_under · Posted: Thu Nov 17, 2005 1:06 pm Post subject:

Oh well, if I see a flag being ignored that I would expect to be used I'll check the ebuild.

If I find any, such as xorg, is it worth reporting the fact to anywhere/anybody?
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kallamej · Posted: Fri Nov 18, 2005 9:11 pm Post subject:

Not sure exactly what your question is. If you mean compiling a list of ebuilds that hard enable SIMD assembler for amd64 there may perhaps be users interested in that. Chances are that the amd64 team already has such a list, though. If you mean packages that support it, but the ebuild doesn't, then please file a bug on our bugzilla.
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d0wn_under · Posted: Mon Nov 21, 2005 12:16 pm Post subject:

What I meant was finding a list of apps where the emerge -pv shows USE flags being ignored but the ebuild being hardcoded to use it anyway as in the example of 3dnow and xorg.
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