gdb 7.6 performance bug

http://sourceware.org/bugzilla/show_bug.cgi?id=15454
http://sourceware.org/bugzilla/show_bug.cgi?id=15519
http://sourceware.org/bugzilla/show_bug.cgi?id=15412

Ubuntu 13.04 带的 gdb 7.5.91 也有同样的问题。

自机编译 gdb 7.5.1,单独将可执行文件 gdb 复制至 /usr/bin/gdb 貌似能简单解决。目前还没发现小版本不匹配引起的问题。
PS: 偶尔会见到替换后的 gdb 的 crash report,但似乎没什么影响。

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