Usage of static library in C

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bauerwo<at>gmx.net - 23 Aug 2004 08:15 GMT

Dear all

I'm a newbie to C, C++, and Visual C++ .Net, so if there is a better place
to ask this question, please let me know.

Using Visual C++ .Net, I haven compiled and linked a static library
"myLib.lib", providing the function "myFunc". I can access it without any
problem in another C++ program "myMain" by writing

extern double myFunc(int N);
pragma comment(lib,"myLib.lib")

But the goal would be to have the calling program be written in C; when I
change the project properties into /TC "Compile as C program", I get

myMain error LNK2019: unresolved external symbol _myFunc referenced in
function _main

What's the right way to include a library into C?

Best regards,

W. Bauer

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David Lowndes - 23 Aug 2004 09:48 GMT

>Using Visual C++ .Net, I haven compiled and linked a static library
>"myLib.lib", providing the function "myFunc". I can access it without any
[quoted text clipped - 9 lines]
>
>What's the right way to include a library into C?

The library function needs to be defined as "C" linkage - see the help
on extern - "Using extern to Specify Linkage".

Dave

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MVP VC++ FAQ: http://www.mvps.org/vcfaq

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bauerwo<at>gmx.net - 29 Aug 2004 18:18 GMT

> The library function needs to be defined as "C" linkage - see the help
> on extern - "Using extern to Specify Linkage".

I suppose this is required when a C library is to be used in C++. But I
would like to use in a C program a library that has been written in C++. Is
this possible?

Many thanks, W. Bauer

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Ronald Laeremans [MSFT] - 30 Aug 2004 23:16 GMT

Only if it exports C functions or if you are willing to get the C code to
compile as C++ (which in general is quite a realistic effort, even for a
relatively large code base).

Ronald Laeremans
Visual C++ team

>> The library function needs to be defined as "C" linkage - see the help
>> on extern - "Using extern to Specify Linkage".
[quoted text clipped - 5 lines]
>
> Many thanks, W. Bauer

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bauerwo<at>gmx.net - 01 Sep 2004 20:37 GMT

> Only if it exports C functions or if you are willing to get the C code
> to compile as C++ (which in general is quite a realistic effort, even
> for a relatively large code base).

Many thanks, now I got it; functions in a dll can be exported and thus be
made accessible by C, super!

Best regards, W. Bauer

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Usage of static library in C

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