Mail Archives: cygwin/2001/02/05/22:10:32
Charles Wilson wrote:
>
> Can't be done. (Well, you have to hack pngcrush.c pretty heavily -- and
> probably have to custom-build a libpng.dll). The problem is that
> pngcrush is not really an "external" program -- it's developed by one of
> the main forces in libpng development, and uses non-exported functions
> from the library. This doesn't matter on unix with shared libs (there
> are no "hidden" functions) and it doesn't matter with static libs. But
> with windows dll's it makes a difference.
Well, actually this might not work with 1.0.9 on any platform. From
pngconf.h (and pngcrush.c #define's PNG_INTERNAL):
#ifdef PNG_INTERNAL
#include <stdlib.h>
/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions,
which
* aren't usually used outside the library (as far as I know), so it is
* debatable if they should be exported at all. In the future, when it
is
* possible to have run-time registry of chunk-handling functions, some
of
* these will be made available again.
#define PNG_EXTERN extern
*/
#define PNG_EXTERN
Guess how all your missing functions are declared? Yup -- PNG_EXTERN.
So not only are they not __declspec(dllimport/dllexport), they aren't
even extern'ed.
--Chuck
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