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[Mingw-users] Problem with 'dllimport'

From: Sisyphus <sisyphus1@op...> - 2005-12-02 07:22

Hi,

First off, a quick thanks to Brian for answering my earlier question of an
hour-or-so-ago re
'MSYS Shell and external libraries' - his solution works nicely (of course
:-)

I'm trying to build audiere-1.9.3 from source and I get this error when
running 'make':

device.cpp:43: error: function `const char*
audiere::AdrGetSupportedAudioDevices()' definition is marked dllimport.

The function definition is:
ADR_EXPORT(const char*) AdrGetSupportedAudioDevices()

Running through the #define statements in various header files it looks like
ADR_EXPORT (ret) is being defined as:

extern "C" __declspec(dllimport) ret __stdcall

Anyway .... this '__declspec(dllimport)' and '__declspec(dllexport)' stuff
confuses me. Does anyone have some advice on what this error means and how
one should deal with it ?  A link to a good, basic, treatment/explanation of
those terms would be helpful - as I'm sure it's gunna take a while to sink
in. I did find
http://sourceware.org/binutils/docs-2.16/ld/WIN32.html#index-direct-linking-to-a-dll-527
which mentions these terms and their relevance to object files ... but
device.cpp is not an object file and I can't quite make the connection ...

Cheers,
Rob

Re: [Mingw-users] Problem with 'dllimport'

From: Greg Chicares <chicares@co...> - 2005-12-02 13:09

On 2005-12-2 7:20 UTC, Sisyphus wrote:
>
> device.cpp:43: error: function `const char*
> audiere::AdrGetSupportedAudioDevices()' definition is marked dllimport.
>
> The function definition is:
> ADR_EXPORT(const char*) AdrGetSupportedAudioDevices()
>
> Running through the #define statements in various header files it looks like
> ADR_EXPORT (ret) is being defined as:
>
> extern "C" __declspec(dllimport) ret __stdcall

My guess is that it's an error in the 'audiere' library:
'dllimport' belongs on the declaration, not the definition.
Reference:
  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_definitions_and_declarations.asp

Re: [Mingw-users] Problem with 'dllimport'

From: Sisyphus <sisyphus1@op...> - 2005-12-03 04:29

----- Original Message ----- 
From: "Greg Chicares" <chicares@...>
To: <mingw-users@...>
Sent: Saturday, December 03, 2005 12:08 AM
Subject: Re: [Mingw-users] Problem with 'dllimport'


> On 2005-12-2 7:20 UTC, Sisyphus wrote:
> >
> > device.cpp:43: error: function `const char*
> > audiere::AdrGetSupportedAudioDevices()' definition is marked dllimport.
> >
> > The function definition is:
> > ADR_EXPORT(const char*) AdrGetSupportedAudioDevices()
> >
> > Running through the #define statements in various header files it looks
like
> > ADR_EXPORT (ret) is being defined as:
> >
> > extern "C" __declspec(dllimport) ret __stdcall
>
> My guess is that it's an error in the 'audiere' library:
> 'dllimport' belongs on the declaration, not the definition.
> Reference:
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_definitions_and_declarations.asp
>

That makes it a little clearer. I find it's fine if I rewrite the offending
line in device.cpp as:
const char* AdrGetSupportedAudioDevices()

'ADR_EXPORT' is specified in the function prototype in the header file. (I
suspect I could also delete the 'const char*' - which is also specified in
the function prototype.)

Thanks for the link (which I've bookmarked).

Cheers,
Rob