Re: extern "C"

From:
"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 11 Feb 2008 08:54:10 -0600
Message-ID:
<#T0Bd2LbIHA.208@TK2MSFTNGP02.phx.gbl>
George wrote:

Thanks for your advice, Ben!

BTW: to make it safe, we should add extern "C" to both declaration and
definition, right?


I do (place extern "C" on both decl and def) and it has always worked
perfectly for me, on all the most common compilers (MSVC 7/7.1/8, gcc
2.x/3.x).

regards,
George

"Ben Voigt [C++ MVP]" wrote:

Tim Roberts wrote:

George <George@discussions.microsoft.com> wrote:

Just to confirm what is the most correct way beyond a just working
function.

1.

We need to add extern "C" to both variable/function
definition/declaration? Or only need to add to the
variable/function declaration?

2.

How about extern? Declaration only or both declaration and
definition are required?

BTW: previously, I only add to declaration, but after reading more
and more code which add to both declaration and definition, I come
to here to ask this question.


extern "C" is only required for the declaration.

Do you understand that extern "C" is only used for C++ that you need
to call from a C function?


extern "C" should also be used with dllexport, even if the caller is
C++, to get rid of the (compiler version dependent) name mangling.

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