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Lightangel
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Joined: 10 Jul 2007
Posts: 127

PostPosted: Mon Nov 05, 2012 9:07 pm    Post subject: All USE flags are set somewhere Reply with quote

Hello,
It looks like on my fresh installation there are somewhere set all possible global USE flags.
My USE flags from /etc/portage/make.conf look like that:

Code:
USE="X a52 aac aalib acl acpi alsa ao apache2 atm audiofile ayatana avahi bash-completion bcmath blas bzip2 cairo caps cdb cdda cddb cdr cgi cjk coreaudio cracklib crypt css ctype cups curl curlwrappers cvs cxx dbus djvu dhcpcd dri dts dvb dvd dvdr emacs encode exif expat fastcgi ffmpeg fftw flac fontconfig fortran ftp gcj gd gdbm gif gmp gnuplot gnutls gpm gsl gstreamer gtk gzip imagemagick imap imlib jabber jack java java6 javascript jbig jingle jit jpeg jpeg2k kde kdeprefix kerberos lame lapack latex libass libnotify libsamplerate libwww lua lzma lzo maildir matroska matrox mime mmap mng modules mozilla mp3 mp4 mpeg mplayer musepack nas ncurses networkmanager nls ogg openal opengl openssl oss pdf perl php plasma plotutils png policykit portaudio posix postscript python python3 qmail-spp qt4 quicktime raw rdesktop readline recode samba sasl sdl skey slang slp snmp sockets socks5 sound ssl subversion svg svga symlink syslog szip tcl tcpd threads tiff tk truetype udev unicode upnp usb vcd vhosts vim-syntax vnc vorbis wavpack win32codecs wmf wxwidgets x264 xattr xcomposite xml xsl xv xvid zeroconf zlib connection-sharing"


But when I type emerge --info I see that there are set all of possible global USE flags:
Code:
Portage 2.1.11.31 (default/linux/x86/10.0/desktop/kde, gcc-4.5.4, glibc-2.15-r2, 3.2.21-gentoo i686)
=================================================================
System uname: Linux-3.2.21-gentoo-i686-VIA_Nehemiah-with-gentoo-2.1
Timestamp of tree: Thu, 01 Nov 2012 20:30:01 +0000
ld GNU ld (GNU Binutils) 2.22
app-shells/bash:          4.2_p37
dev-lang/python:          3.2.3
dev-util/pkgconfig:       0.27.1
sys-apps/baselayout:      2.1-r1
sys-apps/openrc:          0.9.8.4
sys-apps/sandbox:         2.5
sys-devel/autoconf:       2.68
sys-devel/automake:       1.11.6
sys-devel/binutils:       2.22-r1
sys-devel/gcc:            4.5.4
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82-r3
sys-kernel/linux-headers: 3.1 (virtual/os-headers)
sys-libs/glibc:           2.15-r2
Repositories: gentoo
ACCEPT_KEYWORDS="x86"
ACCEPT_LICENSE="* -@EULA"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -march=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS=""
FEATURES=""
FFLAGS=""
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LDFLAGS=""
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac aalib acl acpi alsa ao apache2 atm audiofile avahi bash-completion bcmath berkdb blas bluetooth branding bzip2 cairo caps cdb cdda cddb cdr cgi cjk cli connection-sharing consolekit cracklib crypt css ctype cups curl curlwrappers cvs cxx dbus declarative dhcpcd djvu dri dts dvb dvd dvdr emacs emboss encode exif expat fam fastcgi ffmpeg fftw firefox flac fontconfig fortran ftp gcj gd gdbm gif gmp gnuplot gnutls gpm gsl gstreamer gtk gzip iconv imagemagick imap imlib ipv6 jabber jack java java6 javascript jbig jingle jit jpeg jpeg2k kde kerberos kipi lame lapack latex lcms ldap libass libnotify libsamplerate libwww lua lzma lzo mad maildir matroska matrox mime mmap mng modules mozilla mp3 mp4 mpeg mplayer mudflap musepack nas ncurses networkmanager nls nptl ogg openal opengl openmp openssl oss pam pango pcre pdf perl phonon php plasma plotutils png policykit portaudio posix postscript ppds pppd python python3 qmail-spp qt3support qt4 quicktime raw rdesktop readline recode samba sasl sdl semantic-desktop session skey slang slp snmp sockets socks5 sound spell ssl startup-notification subversion svg svga symlink syslog szip tcl tcpd threads tiff tk truetype udev udisks unicode upnp upower usb vcd vhosts vim-syntax vnc vorbis wavpack win32codecs wmf wxwidgets x264 x86 xattr xcb xcomposite xinerama xml xscreensaver xsl xv xvid zeroconf zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" PHP_TARGETS="php5-3" PYTHON_TARGETS="python3_2 python2_7" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LINGUAS, MAKEOPTS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON


Do you have any ideas where this settings can be found and disabled?
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Jaglover
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Joined: 29 May 2005
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PostPosted: Mon Nov 05, 2012 9:14 pm    Post subject: Reply with quote

Default USE flags are set by profile, choose a leaner one and you'll get less. Next step would be emerging an USE flag editor, I like ufed, and manage your flags with it.
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John R. Graham
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PostPosted: Mon Nov 05, 2012 9:19 pm    Post subject: Reply with quote

@Lightangel,

You probably don't want them disabled. USE flags are set by
  • Your current profile, which can be overridden by
  • The USE variable in /etc(/portage)?/make.conf, which can be overridden by
  • Packages specifically mentioned in /etc/portage/package.use, which can be overridden by
  • A USE variable in the current environment, which can be overridden by
  • The USE variable on the command line when you emerge.
In particular, the profile sets a recommended default set of USE flags which the particular usage pattern supported by the profile typically requires. If you really, really, really want to disable all USE flags except the ones you set, you can prefix your /etc(/portage)?/make.conf USE valriable with "-*". You'll probably break stuff, though.

See
Code:
man make.conf
for more details. And, by the way, that's not nearly all the USE flags you can set.

- John
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Lightangel
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Joined: 10 Jul 2007
Posts: 127

PostPosted: Thu Nov 08, 2012 7:35 pm    Post subject: Reply with quote

@John R. Graham

Thank you for full explanation.
I like to have a full control of how my system works, so I would like to define USE flags myself.
One more thing is bothering me - where the defaults from profile are located?

@Jaglover

Yeah, good to know that there is such tool - I will try it.
Thank you.
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dwbowyer
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PostPosted: Thu Nov 08, 2012 8:43 pm    Post subject: Reply with quote

Code:

doug@amd64 ~ $ ll /etc/make.profile
lrwxrwxrwx 1 root root 54 Feb 22  2011 /etc/make.profile -> ../usr/portage/profiles/default/linux/x86/10.0/desktop


Profiles are cascading, they aggregate values from multiple files at each level of specificity in the path under /usr/portage/profiles/default/.
You don't want to alter those files manually, since "emerge --sync" would (eventually) overwrite your changes.
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Genone
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PostPosted: Fri Nov 09, 2012 3:28 pm    Post subject: Reply with quote

dwbowyer wrote:
Code:

doug@amd64 ~ $ ll /etc/make.profile
lrwxrwxrwx 1 root root 54 Feb 22  2011 /etc/make.profile -> ../usr/portage/profiles/default/linux/x86/10.0/desktop


Profiles are cascading, they aggregate values from multiple files at each level of specificity in the path under /usr/portage/profiles/default/.
You don't want to alter those files manually, since "emerge --sync" would (eventually) overwrite your changes.

Replace "(eventually)" with "(usually)".
Regarding Johns explanation, there are actually some more places that can enable or disable flags, I'll spare you the details as they're somewhat complicated.
If you want to disable some of the default flags you should specifically state them in make.conf / package.use (prefixed with -) rather than using the USE=-*. Using the latter is really an experts option these days, and any problems reported while using it will likely be considered user error.
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John R. Graham
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PostPosted: Fri Nov 09, 2012 5:18 pm    Post subject: Reply with quote

I'd already realized that I'd missed ebuild IUSE defaults from EAPI 1 onwards. What else?

- John
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Genone
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PostPosted: Mon Nov 12, 2012 9:53 am    Post subject: Reply with quote

John R. Graham wrote:
I'd already realized that I'd missed ebuild IUSE defaults from EAPI 1 onwards. What else?

- USE_EXPAND stuff
- flags set implicitly based on other variables (e.g. x86 or test)
- in theory make.globals could set flags
- user profile extensions in /etc/portage/profile
- I think newer versions also allow per-package environment modifications affecting USE, but not sure about that

Mind I've not followed development closely the last few years, so it's quite possible that there are even more things affecting USE flags.
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