blocks|key|15359|text|Doe刚刚想出了如何消除数百个这样的警告:为整个目标或项目设置默认的符号隐藏的+build设置为YES|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|15360|entityMap^0|Y|5|1C|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Doe just figured how to get rid of hundreds of warning like this :
set for an entire target or project with the Symbols Hidden by Default build setting to YES

blocks|key|1491253|text|如果boost包含在多个项目中，则每个项目必须具有相同的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1491254|+Symbols+Hidden+by+Default
+Inline+Methods+Hidden|code-block|syntax|javascript|1491255|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|$]]

If boost is included by multiple projects, each project must have the same values for

<pre><code> Symbols Hidden by Default
 Inline Methods Hidden
</code></pre>

blocks|key|15392|text|链接器抱怨您的项目和Boost之间存在不同的可见性设置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|15393|您还可以通过使用相同的兼容性设置重新编译Boost来解决此问题。|15394|只需加上|15395|cxxflags=-fvisibility=hidden|code-block|syntax|javascript|15396|和|15397|cxxflags=-fvisibility-inlines-hidden|15398|到bjam命令行。|offset|length|style|CODE|15399|entityMap^0|0|0|0|0|0|0|1|4|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|12|8|@$Q|13|R|14|S|T]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

The linker complains about different visibility settings between your project and Boost.

You can also fix that issue by recompiling Boost with the same compatibility settings.

Just add

<pre><code>cxxflags=-fvisibility=hidden
</code></pre>

and 

<pre><code>cxxflags=-fvisibility-inlines-hidden
</code></pre>

to the <code>bjam</code> command line.

blocks|key|3990741|text|默认情况下，将符号隐藏到、NO和内联方法，隐藏到，无me.No工作，需要将任何标志添加到其他C%2B%2B标志|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3990742|entityMap^0|7|18|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Setting Symbols Hidden by Default to NO and Inline Methods Hidden to NO worked for me.No need to add any flag to Other C++ flags

blocks|key|3990650|text|如果boost包含在多个项目中，则每个项目必须具有相同的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3990651|默认情况下隐藏的符号内联方法|3990652|nerith说的是对的，但是在Xcode+4.6.3中，它们不是上面的“默认隐藏的符号”和“内联方法隐藏”，我将gcc_symbols_private_extern设置为是，警告消失了。|3990653|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If boost is included by multiple projects, each project must have the same values for

Symbols Hidden by Default
 Inline Methods Hidden

nerith said is right, but in Xcode 4.6.3,they is not the above "Symbols Hidden by Default" and "Inline Methods Hidden", and i set the gcc_symbols_private_extern to yes, the warning is disappear.

blocks|key|1491290|text|我也有这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1491291|结果发现我不小心做了这样的事：|1491292|#pragma+GCC+visibility+push(default)
#include+<SomeExternalLibrary.h>
void+myExampleSymbol();
#pragma+GCC+visibility+pop|code-block|syntax|javascript|1491293|我把这个问题改为：|1491294|#include+<SomeExternalLibrary.h>
#pragma+GCC+visibility+push(default)
void+myExampleSymbol();
#pragma+GCC+visibility+pop|1491295|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I also had this problem.

It turns out that I was carelessly doing something like this:

<pre><code>#pragma GCC visibility push(default)
#include &lt;SomeExternalLibrary.h&gt;
void myExampleSymbol();
#pragma GCC visibility pop
</code></pre>

Which I solved by changing to:

<pre><code>#include &lt;SomeExternalLibrary.h&gt;
#pragma GCC visibility push(default)
void myExampleSymbol();
#pragma GCC visibility pop
</code></pre>

I have been using a boost framework from the link below for my iPhone Xcode project:
<a href="https://goodliffe.blogspot.com/2010/09/building-boost-framework-for-ios-iphone.html" rel="noreferrer">https://goodliffe.blogspot.com/2010/09/building-boost-framework-for-ios-iphone.html</a>

it works fine but I always get hundreds of Apple Mach-O Linker(id) Warnings like:

<blockquote>
 Direct access in __ZN5boost15program_options6detail7cmdline24handle_additional_parserERSt6vectorISsSaISsEE to global weak symbol __ZTVN5boost17bad_function_callE means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
</blockquote>

How to get rid of those warnings in code?

edited:
By set Symbols Hidden by Default = YES, I managed to get rid of most of the warnings but there are 3 more left which won't go away, can anyone tell me why?

edited again:
After a rebuild the remaining 3 warning are gone as well! So my solution did work!

xcode with boost : linker(Id) Warning about visibility settings

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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我一直在为我的iPhone Xcode项目使用下面链接中的boost框架：它工作正常，但我总是收到数百个Apple Mach-O链接器(Id)警告，如：__ZN5boost15program_options6detail7cmdline24handle_additional_parserERSt6vectorISsSaISsEE中的直接访问全局弱符号__ZTVN5boost17bad_functi

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