***BOGO*** Re: [Mingw-users] trouble converting a MSVC lib

[Christopher Harvey <arbuckle911@xxxxxxxxx>]

Brian Dessent wrote:
> Christopher Harvey wrote:
>
>   
>> I've read the tutorials that explain how to do this but I'm stuck now.
>> Basically I've got 3 files, and no source:
>> NPRigidBody.dll
>> NPRigidBody.h
>> NPRigidBody.lib
>>
>> I copied these into an empty folder then opened up a prompt and ran:
>>
>> pexports NPRigidBody.dll | sed "s/^_//" > NPRigidBody.def
>>     
>
> Why did you do this?  You already have an import library in the form of
> NPRigidBody.lib.
>   
I did it because I only have a vague idea of how to do this.
>   
>> I got this link error:
>> Application.o:Application.cc:(.text+0x18c9): undefined reference to
>> `_imp___Z22RB_InitializeRigidBodyv'
>> Application.o:Application.cc:(.text+0x1b09): undefined reference to
>> `_imp___Z22RB_InitializeRigidBodyv'
>>     
>
> These symbols have been mangled, meaning they have C++ linkage, meaning
> the header did not declare them 'extern "C"'.  If they really have C
> linkage then you need to either a) compile your source with a C compiler
> and not a C++ compiler, or b) edit the header so that they are declared
> 'extern "C"'.
>   
I can't use a C compiler so a is not an option. When you said "edit your 
header", do you mean, "edit your header and re-compile the dll" or did 
you mean "edit your header and recompile the application that is calling 
the dll"? I can't say if it's a C or C++ dll, but one thing is for sure 
all the functions are C compatible.
> Note that the above assumes the library is a C library and you are using
> a C++ compiler.  If the library is a C++ library and was built with MSVC
> then just stop now, it's not going to work.  C++ binary compatibility
> across different vendor compilers is not something that you can
> generally expect to work.
>
>   
>> and tried both those output files. The program linked, but at runtime I get:
>> "The procedure entry point _imp__Z22RB_InitializeRigidBodyv could not
>> be located in the dynamic link library NPRigidBody.dll"
>>     
>
> Right, because you lied in the .def file telling the linker that a
> symbol exists that does not -- that's not going to work.
>
> Brian
>   
Thanks for the reply.
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