Re: [Boost-users] [Exception] Duplicate symbol error when using errinfo_api_function in static library

Subject: Re: [Boost-users] [Exception] Duplicate symbol error when using errinfo_api_function in static library
From: Georg Leidinger (georg.leidinger_at_[hidden])
Date: 2013-10-03 03:03:55

I found this *clang bug* http://llvm.org/bugs/show_bug.cgi?id=10113 which
seems to be related to the problem.

2013/10/3 Georg Leidinger <georg.leidinger_at_[hidden]>

> It happens only if the library is build with the *LLVM 4.2* (I am using
> XCode so it is the Apple LLVM 4.2, I don't know if there is something
> different from the standard LLVM 4.2). If I choose the *LLVM GCC 4.2* no
> errors are reported. Is this a bug in the LLVM compiler?
>
> best
> Georg Leidinger
>
> 2013/10/3 Emil Dotchevski <emildotchevski_at_[hidden]>
>
>> On Wed, Oct 2, 2013 at 3:06 PM, Georg Leidinger <
>> georg.leidinger_at_[hidden]> wrote:
>>
>>> Hi Emil,
>>>
>>> I was able to figure out some more information about the issue and I
>>> could isolate it a little bit more. First it doesn't matter if it is a
>>> static or a shared library. Second it is not directly related to the *
>>> Boost.Exception* library but to the template class *error_info* which
>>> is used to create the predefined errinfo_xyz types. It is enough to
>>> instantiate the *errinfo_api_function* type in both doSomething()
>>> methods in the both implementation files. I am not so good in templates but
>>> I guess that the compiler creates the same symbol in both object files
>>> (ClassA.o and ClassB.o) for the type *errinfo_api_function.* I can see
>>> this via nm that I have the following line in both object files:
>>>
>>> *ClassA.o*
>>> *0000000000059860 s __ZTIN5boost21errinfo_api_function_E*
>>> *
>>> *
>>> *ClassB.o*
>>> *0000000000059870 s __ZTIN5boost21errinfo_api_function_E *
>>>
>>
>> Instantiating a template in two compilation units should not lead to link
>> errors. That's why I can't understand why this happens.
>>
>> --
>> Emil Dotchevski
>> Reverge Studios, Inc.
>> http://www.revergestudios.com/reblog/index.php?n=ReCode
>>
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>
>