Complation problem involving namespaces.

[Frederick Reeve]

Hey all I have a little compilation problem I think is related to name
spaces but being new to C++ still I don't know the program
(http://rafb.net/paste/results/f1416037.html) when it is being linked
returns with "undefined reference to foo" for function in a C lib i have
linked... any Ideas?

I am attempting to link a C lib and I think the complication comes in here
also.

If it would be better I can post the program in another message. Its only
153 lines. The program in the opening comments includes the command I use
to compile this and the c version of it. The C version compiles fine by
the way.

Thanks for being there guys.

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[Ivan Vecerina]

Re: Complation problem involving namespaces.


"Frederick Reeve" <fred-e-rick@woodland-i.org> wrote in message
news:pan.2003.1 1.20.03.09.50.4 36285@woodland-i.org...
| Hey all I have a little compilation problem I think is related to name
| spaces but being new to C++ still I don't know the program
| (http://rafb.net/paste/results/f1416037.html) when it is being linked
| returns with "undefined reference to foo" for function in a C lib i have
| linked... any Ideas?
|
| I am attempting to link a C lib and I think the complication comes in here
| also.
.....
| The C version compiles fine by the way.

To include C headers from a C++ program, you need to place them
within an extern "C" block:
extern "C" {
#include <SomeCHeader. h>
}
This is because the C++ compiler uses name mangling (encoding the type
of the parameters into the link name of a function) to allow function
overloading. This mangling is disabled within the extern "C" block...


Cheers,
Ivan
--

http://ivan.vecerina.com

[Frederick Reeve]

Re: Complation problem involving namespaces.

> To include C headers from a C++ program, you need to place them[color=blue]
> within an extern "C" block:
> extern "C" {
> #include <SomeCHeader. h>
> }
> This is because the C++ compiler uses name mangling (encoding the type
> of the parameters into the link name of a function) to allow function
> overloading. This mangling is disabled within the extern "C" block...[/color]

Thanks a lot Ivan That took care of the problem.

Frederick.

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