Strange linker error in cpp

Question

When I add the following line to my code:

std::string sFrameTag

I get the following linker error:

Error   34  error LNK2005: "public: __thiscall std::basic_string<char,struct 
std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct 
std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?
$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in 
VFPAnalyzerApi.lib(VFPEvaluation.obj)   msvcprtd.lib

I'm sure sFrameTag is only defined once, I tried using other names for this variable to be sure. I have the following includes: stdio.h, time.h, string.

Can someone please guide it as to what causes this error?

Please show us the actual line you added to your code (and maybe some of the code, if it isn't 100+ lines). It can't be std::string sFrameTag, that's missing at least a semicolon, and I suspect there are a few parantheses or other stuff as well. — us2012
– us2012, Commented Mar 27, 2013 at 11:39
You may show more detail, incuding the file you define in, and others. — hello.co
– hello.co, Commented Mar 27, 2013 at 11:46
Since the multiply defined symbol is the std::string destructor I don't see how the code can be to blame. The error is in the compiler/linker/project settings, or maybe the way in which VFPAnalyzerApi.lib was built. — john
– john, Commented Mar 27, 2013 at 11:56

anonymous · Accepted Answer · 2013-03-27 12:11:45Z

1

I too get similar kind of errors when I tried to statically include all needed runtime libraries. Do check that when you are trying to import a library which is linked statically with /MD option you also need to use /MD.

Thanks Niraj Rathi

answered Mar 27, 2013 at 12:11

anonymous

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3 Comments

GilLevi Over a year ago

Thanks Niraj, but can you please explain what exactly I need to do? I'm not sure how to use /MD.. Thank you in advance!!

john Over a year ago

@user2215359 It depnds on which version of VC++ you are using. But on my version the relavent options are under Project Properties - C/C++ - Code Generation - Runtime Library

GilLevi Over a year ago

OK, so I took a look at the project properties, under C/C++ -> code generation -> runtime Library and changed it from /MDd to /MD and now it works!!! Thanks!! But, can someone please explain what exactly is the meaning of this change? thanks in advance.

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