[trunk] fix compilation on OS where ssize_t is not defined.

CMakeLists.txt

@@ -209,6 +209,9 @@ IF(BUILD_CODEC OR BUILD_MJ2)
   ADD_SUBDIRECTORY(applications)
 ENDIF (BUILD_CODEC OR BUILD_MJ2)
 
+include(CheckTypeSize)
+CHECK_TYPE_SIZE(ssize_t     SSIZE_T)
+
 #-----------------------------------------------------------------------------
 # opj_config.h generation (2/2)
 CONFIGURE_FILE("${OPENJPEG_SOURCE_DIR}/opj_config.h.cmake.in"

libopenjpeg/opj_stdint.h

@@ -48,4 +48,9 @@ typedef size_t        OPJ_SIZE_T;
 /* 64-bit file offset type */
 typedef int64_t OPJ_OFF_T;
 
+#ifndef HAVE_SSIZE_T
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif
+
 #endif /* OPJ_STDINT_H */

opj_config.h.cmake.in

@@ -14,6 +14,7 @@
 #cmakedefine HAVE_PNG_H @HAVE_PNG_H@
 #cmakedefine HAVE_LIBTIFF @HAVE_LIBTIFF@
 #cmakedefine HAVE_TIFF_H @HAVE_TIFF_H@
+#cmakedefine HAVE_SSIZE_T @HAVE_SSIZE_T@
 
 #cmakedefine _LARGEFILE_SOURCE
 #cmakedefine _LARGE_FILES