将 gnome 升级到了 3.14
主要是想体验一下传说中的可用的 wayland + gnome。
GENTOO Portage 中目前还没提供 gnome 3.14 ebuild。找了一下，thankjura fork 的半官方 gnome overlay 提供了 gnome 3.14 的大部分 ebuild，得到它们：
$ git clone https://github.com/thankjura/gentoo-gnome.git
然后修改一下 /etc/make.conf，增加以下的类似内容：
PORTDIR_OVERLAY="/home/xxxx/portage/gentoo-gnome $PORTDIR_OVERLAY"
如果想体验 wayland 后端的 gnome 3.14，建议在 /etc/make.conf 文件中开启全局的 wayland 旗标。
再在个人的 USE 定制文件中增加：
media-libs/cogl gles2 kms
media-libs/mesa gles2
x11-libs/libxcb xkb
注意，thankjura 提供的 cogl ebuild 中是没有 kms 旗标的，但是再编译 mutter 时，mutter 依赖 clutter 的 kms 方面的函数，而 clutter 的 kms 函数只是对 cogl 的 kms 函数的封装，所以必须在 cogl 这个源头就得支持 kms。之所以会出现这个问题，可能是 mutter 包目前未提供可以关掉 kms 的功能。我没搞清楚为啥非要 kms……总之，我们要修改 thankjura 提供的 cogl ebuild，否则 mutter 编译不过去。下面给出我修改的部分：
IUSE="examples gles2 gstreamer +introspection +opengl +pango test wayland kms"
src_configure() {
# TODO: think about kms-egl, quartz, sdl, wayland
# Prefer gl over gles2 if both are selected
# Profiling needs uprof, which is not available in portage yet, bug #484750
# FIXME: Doesn't provide prebuilt docs, but they can neither be rebuilt, bug #483332
gnome2_src_configure \
--disable-examples-install \
--disable-maintainer-flags \
--enable-cairo \
--enable-deprecated \
--enable-gdk-pixbuf \
--enable-glib \
$(use_enable opengl glx) \
$(use_enable opengl gl) \
$(use_enable gles2) \
$(use_enable gles2 cogl-gles2) \
$(use_enable gles2 xlib-egl-platform) \
$(usex gles2 --with-default-driver=$(usex opengl gl gles2)) \
$(use_enable gstreamer cogl-gst) \
$(use_enable introspection) \
$(use_enable pango cogl-pango) \
$(use_enable test unit-tests) \
$(use_enable kms kms_egl_platform) \
$(use_enable wayland wayland-egl-platform) \
$(use_enable wayland wayland-egl-server) \
--disable-profile
# $(use_enable profile)
}
除了 cogl 需要改，clutter 也需要改。mutter 需要 clutter 支持 evdev input 什么的……这意味着需要安装一个 libinput 的包，但是 thankjura 没有提供 libinput 的 ebuild，可以在自己的 overlay/dev-libs 分类中增加目录 libinput，然后在该目录内增加 libinput-0.6.ebuild，内容为：
# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
EAPI=5
DESCRIPTION="Library to handle input devices in Wayland"
HOMEPAGE="http://www.freedesktop.org/wiki/Software/libinput/"
SRC_URI="http://www.freedesktop.org/software/${PN}/${P}.tar.xz"
LICENSE=""
SLOT="0"
KEYWORDS="~amd64"
IUSE=""
DEPEND="
dev-libs/libevdev"
RDEPEND="${DEPEND}"
再修改一下 thankjura 的 clutter ebuild，我修改的部分：
IUSE="debug doc gtk +introspection +egl test wayland +evdev" # evdev tslib
src_configure() {
# XXX: Conformance test suite (and clutter itself) does not work under Xvfb
# (GLX error blabla)
# XXX: Profiling, coverage disabled for now
# XXX: What about cex100/egl/osx/wayland/win32 backends?
# XXX: evdev/tslib input seem to be experimental?
gnome2_src_configure \
--enable-xinput \
--enable-x11-backend=yes \
--disable-profile \
--disable-maintainer-flags \
--disable-gcov \
--disable-cex100-backend \
--disable-quartz-backend \
--disable-win32-backend \
--disable-tslib-input \
$(use_enable evdev evdev-input) \
$(usex debug --enable-debug=yes --enable-debug=minimum) \
$(use_enable doc docs) \
$(use_enable gtk gdk-backend) \
$(use_enable introspection) \
$(use_enable test gdk-pixbuf) \
$(use_enable egl egl-backend) \
$(use_enable wayland wayland-backend) \
$(use_enable wayland wayland-compositor)
}
现在差不多可以省级系统了……不过，如果要体验 wayland，而你的显卡是 Nvidia，要记得把驱动换成 nouveau。貌似现在运行在 wayland 上面的 gnome 只是能看，不怎么好用。我用的 fcitx 版本还不支持 wayland，所以没法输入中文；其次就是鼠标对桌面的操控有些障碍，指针有时会乱跳，鼠标中键没法滚动屏幕……所以，我围观了一下传说中的 wayland，很快的又切换回了 X11。
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