Emacs + Gdb
早有耳闻这两者是不错的搭配
真正试验了一把之后发现
那岂止是不错，那是相当的不错！
绝配啊
Linux的程序员一定要试一下
否则终生遗憾
两个提示：
一个是在~/.emacs里定义变量gdb-many-windows：(defvar gdb-many-windows t)
再一个是启用gub-tooltip-mode，这样鼠标指向源代码里的变量时，emacs就能以tooltip提示框的形式显示变量的地址和值。再也不用p和x了。
简直是太方便了，太方便了！
portage-2.2 preserve-libs FEATURES explained
Maybe I am not the right person to write about it. But I felt the necessity to write about it. So I will just write something about preserve-libs, leaving other FEATURES to more competent people. Portage-2.2 has already entered unstable tree. Many people has started using it. It has many new features, like preserve-libs, sets, license filter and so on. Please check README and RELEASE-NOTES for a complete list. I will only talk about preserve-libs. To understand why we need it, we have to know some background information. First of all, applications are not built from scratch. Any non trivial apps use lot of libraries. In GNU/Linux, most of them are shared libraries, i.e. .so files. You can use `ldd /usr/bin/mplayer` to check what shared libraries an app has been linked to, replace mplayer to whatever program you'd like to check. Shared libraries have versions. E.g. /usr/lib/libavformat.so.51, here 51 denotes its version. After upgrading, the version number may change. E.g. /usr/lib/...
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