blocks|key|4488893|text|您必须手动链接boost_thread：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4488894|g%2B%2B+-std=c%2B%2B11+boost_log_sinks.cpp+-DBOOST_LOG_DYN_LINK+-lboost_log+-lboost_thread+-lpthread|code-block|syntax|javascript|4488895|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You must link boost_thread manualy:

<pre><code>g++ -std=c++11 boost_log_sinks.cpp -DBOOST_LOG_DYN_LINK -lboost_log -lboost_thread -lpthread
</code></pre>

blocks|key|3798305|text|boost_log库使用来自其他boost库的特性。不幸的是，文档未能指出哪些库是这些库。因此，每当您使用这些特性之一时，都需要链接到该特性所在的相应库，或者得到错误消息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3798306|对符号的未定义引用
|blockquote|3798307|3798308|我使用的解决方案是循环所有boost库来搜索该符号(在您的例子中是_ZN5boost6detail12get_tss_dataEPKv)。|offset|length|style|CODE|3798309|在Ubuntu17.04中，boost库存储在/usr/lib/x86_64-linux-gnu/libboost_*中|3798310|因此，使用以下脚本：|3798311|for+i+in+/usr/lib/x86_64-linux-gnu/libboost_*
do
+++echo+$i
+++nm+$i%7Cgrep+_ZN5boost6detail12get_tss_dataEPKv
done|code-block|syntax|javascript|3798312|您可以得到使用符号(U)的库列表，例如：|3798313|/usr/lib/x86_64-linux-gnu/libboost_log.a
+++++++++++++++++U+_ZN5boost6detail12get_tss_dataEPKv
+++++++++++++++++U+_ZN5boost6detail12get_tss_dataEPKv
+++++++++++++++++U+_ZN5boost6detail12get_tss_dataEPKv
/usr/lib/x86_64-linux-gnu/libboost_log_setup.a
+++++++++++++++++U+_ZN5boost6detail12get_tss_dataEPKv|3798314|或定义(T)，例如：|3798315|/usr/lib/x86_64-linux-gnu/libboost_thread.a
0000000000000740+T+_ZN5boost6detail12get_tss_dataEPKv|3798316|最后一个是你需要的。它告诉您正在寻找的符号在库libboost_thread.a中。所以，现在要做的就是在链接命令中包含这个lib：|3798317|g%2B%2B+-std=c%2B%2B11+boost_log_sinks.cpp+-DBOOST_LOG_DYN_LINK+-lboost_log+-lboost_thread+-lpthread|3798318|entityMap^0|0|0|0|X|Y|0|N|10|0|0|0|0|0|0|0|N|H|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$]]|$1|E|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1B|8|@$H|1C|I|1D|J|K]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1E|8|@$H|1F|I|1G|J|K]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1H|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1I|8|@]|9|@]|A|$S|T]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|R|7|1K|8|@]|9|@]|A|$S|T]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|11|5|R|7|1M|8|@]|9|@]|A|$S|T]]|$1|12|3|13|5|6|7|1N|8|@$H|1O|I|1P|J|K]]|9|@]|A|$]]|$1|14|3|15|5|R|7|1Q|8|@]|9|@]|A|$S|T]]|$1|16|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|17|$]]

The boost_log library uses features from other boost libraries. Unfortunately the documentation fails to indicate which ones are these libraries. So whenever you use one of these features, you need to link with the corresponding lib in which that feature is in or you get the error message:

<blockquote>
 undefined reference to symbol 
</blockquote>

The solution I use is to loop all boost libs to search for that symbol (in your case <code>_ZN5boost6detail12get_tss_dataEPKv</code>.) 

In Ubuntu 17.04 the boost libs are stored in <code>/usr/lib/x86_64-linux-gnu/libboost_*</code>

So with following script:

<pre><code>for i in /usr/lib/x86_64-linux-gnu/libboost_*
do
 echo $i
 nm $i|grep _ZN5boost6detail12get_tss_dataEPKv
done
</code></pre>

you get a list of libraries where the symbol is either used (U), e.g.:

<pre><code>/usr/lib/x86_64-linux-gnu/libboost_log.a
 U _ZN5boost6detail12get_tss_dataEPKv
 U _ZN5boost6detail12get_tss_dataEPKv
 U _ZN5boost6detail12get_tss_dataEPKv
/usr/lib/x86_64-linux-gnu/libboost_log_setup.a
 U _ZN5boost6detail12get_tss_dataEPKv
</code></pre>

or defined (T), e.g.:

<pre><code>/usr/lib/x86_64-linux-gnu/libboost_thread.a
0000000000000740 T _ZN5boost6detail12get_tss_dataEPKv
</code></pre>

This last one is the one you need. It tells that the symbol you are looking for is in the library <code>libboost_thread.a</code>. So all you have to do now is to include that lib in your link command:

<pre><code>g++ -std=c++11 boost_log_sinks.cpp -DBOOST_LOG_DYN_LINK -lboost_log -lboost_thread -lpthread
</code></pre>

blocks|key|4096318|text|要编译示例file.cpp，在Ubuntu中，我必须对所有这些库使用编译：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4096319|$+c%2B%2B+-DBOOST_LOG_DYN_LINK+tutorial_file.cpp+\
-lboost_log_setup+-lboost_log+-lboost_thread+-lpthread+-lboost_system|code-block|syntax|javascript|4096320|entityMap|0|LINK|mutability|MUTABLE|url|https://www.boost.org/doc/libs/1_71_0/libs/log/example/doc/tutorial_file.cpp^0|5|8|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

To compile the example <a href="https://www.boost.org/doc/libs/1_71_0/libs/log/example/doc/tutorial_file.cpp" rel="nofollow noreferrer">https://www.boost.org/doc/libs/1_71_0/libs/log/example/doc/tutorial_file.cpp</a>, in Ubuntu I had to use a compilation with all these libraries:

<pre class="lang-sh prettyprint-override"><code>$ c++ -DBOOST_LOG_DYN_LINK tutorial_file.cpp \
-lboost_log_setup -lboost_log -lboost_thread -lpthread -lboost_system
</code></pre>

I was considering using boost_log for one project and right at the beginning I faced following problem.

Boost Log Example I found at: <a href="http://www.boost.org/doc/libs/1_54_0/libs/log/example/doc/tutorial_file.cpp" rel="noreferrer">http://www.boost.org/doc/libs/1_54_0/libs/log/example/doc/tutorial_file.cpp</a> fails to compile. Other simpler examples (without sinks) I compile without problems.

<pre><code>g++ -std=c++11 boost_log_sinks.cpp -DBOOST_LOG_DYN_LINK -lboost_log -lpthread
</code></pre>

<blockquote>
 /usr/bin/ld: /tmp/ccApJdsi.o: undefined reference to symbol
 '_ZN5boost6detail12get_tss_dataEPKv'
 //usr/lib/x86_64-linux-gnu/libboost_thread.so.1.54.0: error adding
 symbols: DSO missing from command line collect2: error: ld returned 1
 exit status
</blockquote>

I am working on Ubuntu14.04 my g++ version is g++ (Ubuntu 4.8.2-19ubuntu1) 4.8.2

Does anybody knows why is this happening?

boost_log example with sinks fails to compile

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我考虑在一个项目中使用boost_log，一开始我就遇到了以下问题。Boost日志示例：无法编译。我编译的其他更简单的示例(没有接收器)没有问题。g++ -std=c++11 boost_log_sinks.cpp -DBOOST_LOG_DYN_LINK -lboost_log -lpthread/usr/bin/ ...

问带有接收器的boost_log示例无法编译
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问带有接收器的boost_log示例无法编译EN