bug_ebuild/gentoo/profiles/default/linux/make.defaults

# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
#
# System-wide defaults for the Portage system
# See portage(5) manpage
#
# Please avoid enabling things by default in here if possible. Understand any 
# implications with core packages.  For example, if "java" is in USE and db 
# has a conditional dependency on java (which it does,) then a JDK will be 
# pulled in during *emerge system*!


# Default starting set of USE flags for all default/linux profiles.
USE="berkdb crypt ipv6 ncurses nls pam readline ssl tcpd zlib"

# make sure toolchain has sane defaults <tooclhain@gentoo.org>
USE="${USE} fortran openmp"

# Security ftw.
USE="${USE} seccomp"

# 2010/10/21 - Ole Markus With <olemarkus@gentoo.org>
# These USE flags were originally inserted here because of PHP
# and were later removed by me. Reinserting the USE flags again because they are
# global USE flags that may be expected to be set by other packages.
USE="${USE} cli pcre session"

# 2006/03/07 - Donnie Berkholz <dberkholz@gentoo.org>
# Modular X: Support direct rendering by default
# 2013/01/21 - Andreas K. Huettel <dilfridge@gentoo.org>
# Re-added following discussion with chithead
USE="${USE} dri"

# 2006/10/28 - Luca Barbato <lu_zero@gentoo.org>
# on glibc system you cannot turn it off
USE="${USE} iconv"

# 2017/01/17 - Matt Turner <mattst88@gentoo.org>
# Sane defaults for input drivers
INPUT_DEVICES="libinput"

# 2006/08/18 - Donnie Berkholz <dberkholz@gentoo.org>
# Lowest common denominator defaults for video drivers,
# except hppa, which lacks v4l so removes it in the hppa profile
VIDEO_CARDS="dummy fbdev v4l"

# 2008/07/09 - Doug Goldstein <cardoe@gentoo.org>
# Adding LDFLAGS="-Wl,-O1 for all Linux profiles by default
# after discussion on the gentoo-dev ML. As we bang out a clear
# direction with how LDFLAGS will be set by default, this entry
# may move.
# 2010/07/12 - Samuli Suominen <ssuominen@gentoo.org>
# Note that adding LDFLAGS="-Wl,-O1 ${LDFLAGS}" breaks dev-util/boost-build
# because of whitespace.
LDFLAGS="-Wl,-O1 -Wl,--as-needed"

# 2009/09/21 Robin H. Johnson <robbat2@gentoo.org>
# https://archives.gentoo.org/gentoo-dev/msg_dc705dc2c1a45e18a85aa62e8fb17009.xml
# Build kernel modules from linux-mod by default:
USE="${USE} modules"