Sharing a variable across libraries
guddu
I have to share a variable across two libraries. These libraries are
build separately and share a common header file.
I had tried this earlier using extern variable. That didn't help.
Any ideas about this ??
Thanks and Regards,
Vishal
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Andrei Voropaev
> I have to share a variable across two libraries. These libraries are
> build separately and share a common header file.
>
> I had tried this earlier using extern variable. That didn't help.
>
> Any ideas about this ??
Well, try to read some documents available in internet. Buy some
programming books. Ask someone. But please, don't state that something
is not possible simply because you didn't manage to get it working :)
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Paul D. DeRocco
>
> I have to share a variable across two libraries. These libraries are
> build separately and share a common header file.
>
> I had tried this earlier using extern variable. That didn't help.
In general, C prohibits you from duplicating anything that takes memory,
whether it's a variable or a function, in more than one module. Some
toolchains let you create the equivalent of Fortran common blocks, and
indeed that facility is commonly used in C++ code for things like virtual
function tables, but it's outside the C paradigm, because it's impossible to
ensure that both definitions are the same.
However, it doesn't make much sense to me to have two libraries sharing one
header file. In general, a header file describes one collection of related
resources. And since a library is a container from which a linker can pull
in only the modules you actually need, you probably want to put the two
libraries together. Then, your problem goes away.
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Ciao, Paul D. DeRocco
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