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From: "Mark" <wilson_m_r@yahoo.com>
Subject: Re: Linking to c++ libraries problem
Date: 1998/08/19
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Date: 1998-08-19T00:00:00+00:00
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Jerry van Dijk <jerry@jvdsys.nextjk.stuyts.nl> wrote in article
<ExwJqp.B4@jvdsys.nextjk.stuyts.nl>...
> Mark (wilson_m_r@yahoo.com) wrote:
> 
> : I am using the Gnat ada compiler to link an ada program with functions
> : defined in c++ . libraries (Microsoft Visual c++ v5).
> 
> Ok. Assuming you are using 3.10p.

	Correct.

> 
> : The problem I am having is that the c++ libraries make use of C++
library
> : functions (like printf)
> 
> Actually, printf is a C library function, in C++ you would use the 
> cout stream.
>

 	I am using libraries that have been created using Microsoft Visual c++ v5
which I presume has an c compiler built in.

> : and when I link using the Gnat ada compiler I get
> : undefined references to a host of things (like _imp__fprintf). 
> 
> : I think that I want to add to this a library to resolve the missing
> : declarations but I am not sure what the library is.
> 
> : Is this library available within gnat?
> 
> Since you are calling a C library function
 	
	I am calling a c function that has been resolved by the list of provided
libraries, the    library functions that I'm calling then make use of
standard c functions like printf.


>                                                            , it tries to
link to the 
> MS C runtime DLL import library. GNAT links in the gcc style import
> library to this dll, which has a different format, so, the function
> is not found.
> 
> The easiest way out is to recompile your C or C++ code using gcc.

	I do not have the source, only the ".lib" files.

> (if it is C code, the C compiler is included with gnat). If that is
> not possible, recompile the C++ code as a dll and import this through
> a package. See my homepage: http://stad.dsl.nl/~jvandyk for more info.

	At present I'm asking the supplier of the libraries to provide me with the
dlls. 
	
	Has this not already been done before for the standard c and c++
libraries?

     Thanks for the help 
	Mark


	Whats for you wont go by you!