针对 libwireshark 进行编译
我正在尝试在 Ubuntu 10.10 上针对 libwireshark 编译一个程序。我已经安装了 wireshark-dev 软件包，它已在 /usr/lib/wireshark 和 /usr/include/wireshark 中安装了文件。
我的 C 源代码文件的头部包含一个 #include 指令，我的 gcc 命令行参数如下：
$ gcc -I/usr/include/wireshark `pkg-config --libs --cflags glib-2.0` -Wall -o test.out test.c -L/usr/lib/wireshark -lwireshark
但是，这会返回许多错误，包括：
/usr/lib/gcc/i686-linux-gnu/4.4.5/include/varargs.h:4: error: #error "GCC no longer implements <varargs.h>."
/usr/include/wireshark/epan/ftypes/ftypes.h:258: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘union’
我应该做什么来纠正这些问题？
I am attempting to compile a program against libwireshark on Ubuntu 10.10. I have installed the wireshark-dev package, which has installed files in /usr/lib/wireshark and /usr/include/wireshark.
The head of my C source code file contains a #include <epan/epan.h> directive and my gcc command line arguments are as follows:
$ gcc -I/usr/include/wireshark `pkg-config --libs --cflags glib-2.0` -Wall -o test.out test.c -L/usr/lib/wireshark -lwireshark
However, this returns many errors, including:
/usr/lib/gcc/i686-linux-gnu/4.4.5/include/varargs.h:4: error: #error "GCC no longer implements <varargs.h>."
/usr/include/wireshark/epan/ftypes/ftypes.h:258: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘union’
What should I do to rectify these issues?
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这似乎是一个用户不友好的包装和代码组织的简单案例。您需要首先包含 Wireshark 的“config”标头。我会这样写：
每当您包含此库中的标头时，请确保首先执行此操作。
我怎么知道的？我深入研究了 epan/proto.h，发现只有在未设置 HAVE_STDARG 时，它才会有条件地包含 varargs.h。然后我在
/usr/include/wireshark/中grep发现这个变量是在config.h中设置的，所以我想它可能有必要将其包括在内，瞧，确实如此。我还需要添加 -lwiretap 以满足与 libwireshark 的链接。
wireshark-dev组织中的另一个缺陷是它不依赖于（在包级别）wireshark-common，即使后者确实提供了实际的>libwireshark.so前一个符号链接到的。因此，您应该确保安装了wireshark-common，或者/usr/lib/libwireshark.so及其引用存在。It seems a simple case of user-unfriendly packaging and code organization. You need to include the "config" header for Wireshark first. I would write it this way:
Be sure that you do this first whenever you include headers from this library.
How did I know? I dug into
epan/proto.hand found that it conditionally includesvarargs.honly ifHAVE_STDARGis not set. I thengrep'd in/usr/include/wireshark/and found this variable is set inconfig.h, so I figured it might be necessary to include it, and lo, it was.I also needed to add
-lwiretapto satisfy linkage withlibwireshark.Another nit in the organization of
wireshark-devis that it does not depend (at the package level) onwireshark-common, even though the latter does provide the actuallibwireshark.sowhich the former symlinks to. So you should make sure thatwireshark-commonis installed, or that/usr/lib/libwireshark.soand its referent exist.