openjpeg.h have issue with defining std call for Windows. It need to be declared for static builds too. Patch:

--- openjpeg-2.1.0/src/lib/openjp2/openjpeg.h.orig 2014-04-29 11:15:02.000000000 +0400 +++ openjpeg-2.1.0/src/lib/openjp2/openjpeg.h 2014-08-31 00:25:32.771200000 +0400 @@ -76,6 +76,12 @@ #define OPJ_DEPRECATED(func) func #endif

+#if defined(_WIN32) +#define OPJ_CALLCONV stdcall +#else +#define OPJ_CALLCONV +#endif + #if defined(OPJ_STATIC) || !defined(_WIN32) /* http://gcc.gnu.org/wiki/Visibility / #if __GNUC >= 4 @@ -85,9 +91,7 @@ #define OPJ_API #define OPJ_LOCAL #endif -#define OPJ_CALLCONV #else -#define OPJ_CALLCONV __stdcall / The following ifdef block is the standard way of creating macros which make exporting from a DLL simpler. All files within this DLL are compiled with the OPJ_EXPORTS @@ -101,7 +105,7 @@ #else #define OPJ_API __declspec(dllimport) #endif /* OPJ_EXPORTS / -#endif / !OPJ_STATIC || !_WIN32 / +#endif / OPJ_STATIC || !_WIN32 */

typedef int OPJ_BOOL; #define OPJ_TRUE 1

Also: why on Earth did you guys switch to stdcall at all?

I am ok to apply the patch as is but instead can we switch to __cdecl ? What would be the consequences ?

Looks like mingw may prefer cdecl:

http://stackoverflow.com/a/6635067/136285