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kemu
n00b
Joined: 19 Mar 2003
Posts: 32
Location: Belgium
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 Posted: Wed Mar 19, 2003 2:58 pm Post subject: use variable question ? |
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I've read all the how to's on this subject I get how to use this var
but I don't get one thing lke if I set this simple use var use="python gnome"
what does this do then , if I compile an application. Will it use python more optimal if there is python in the software and if I added -python and there was python in the software would it then compile the package less optimal ?? |
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Carlos
Guru
Joined: 07 Aug 2002
Posts: 458
Location: Providence, RI
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| Posted: Wed Mar 19, 2003 3:55 pm Post subject: |
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Let's say package foobar has optional Python modules. If "python" is in USE, then those will get installed, otherwise they won't.
On the other hand, let's say package frob is written in Python, or for some other reason requires Python. Then if you emerg frob Python will get installed whether or not "python" is in USE.
The point of USE is to enable or disable optional functionality in ebuilds; it has no effect when a package depends on another.
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BonezTheGoon
Bodhisattva
Joined: 14 Jun 2002
Posts: 1408
Location: Albuquerque, NM -- birthplace of Microsoft and Gentoo
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| Posted: Wed Mar 19, 2003 4:24 pm Post subject: |
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Fantastic job on explaining USE variables Carlos! That's the very best quick and precise description I have seen. For anyone looking for my very very very long winded description and a questions and answers thread can check out this thread.
[sigh] I still don't get the USE variables. (I do now)
Regards,
BonezTheGoon |
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Carlos
Guru
Joined: 07 Aug 2002
Posts: 458
Location: Providence, RI
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| Posted: Thu Mar 20, 2003 2:16 am Post subject: |
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| BonezTheGoon wrote: | | Fantastic job on explaining USE variables Carlos! |
Thanks. 
I just realized one thing I should clarify, though. Let's say I'm emerging nethack, which is influenced by the "qt" USE variable. Now, even though I have QT installed, if I put "-qt" in USE then nethack's QT-based GUI won't get compiled. This could be useful if, say, I only played nethack from the console.
So with USE flags you can make your system lean in two ways: by preventing the merging of unnecessary optional dependencies, and by preventing the building of optional functions that would make a package larger.
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pjp
Administrator
Joined: 16 Apr 2002
Posts: 20067
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| Posted: Thu Mar 20, 2003 5:26 am Post subject: |
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Moved from Other Things Gentoo.
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