unchanged:

--- a/gdal/frmts/jpeg2000/jpeg2000dataset.cpp

+++ b/gdal/frmts/jpeg2000/jpeg2000dataset.cpp

@@ -484,7 +484,7 @@ int JPEG2000Dataset::DecodeImage()

     /* the JP2 boxes match the ones of the code stream */

     if (nBands != 0)

     {

-        if (nBands != jas_image_numcmpts( psImage ))

+        if (nBands != static_cast<int>(jas_image_numcmpts( psImage )))

         {

             CPLError(CE_Failure, CPLE_AppDefined,

                      "The number of components indicated in the IHDR box (%d) mismatch "

@@ -595,7 +595,7 @@ GDALDataset *JPEG2000Dataset::Open( GDALOpenInfo * poOpenInfo )

 {

     int         iFormat;

-    char        *pszFormatName = nullptr;

+    const char *pszFormatName = nullptr;

     if (!Identify(poOpenInfo))

         return nullptr;

only in patch2:

unchanged:

--- a/gdal/frmts/jpeg2000/jpeg2000_vsil_io.cpp

+++ b/gdal/frmts/jpeg2000/jpeg2000_vsil_io.cpp

@@ -94,13 +94,23 @@ typedef struct {

 * File stream object.

 \******************************************************************************/

+// PRIjas_seqent macro is defined since Jasper 2.0.17

+

+#ifndef PRIjas_seqent

 static int JPEG2000_VSIL_read(jas_stream_obj_t *obj, char *buf, int cnt)

+#else

+static int JPEG2000_VSIL_read(jas_stream_obj_t *obj, char *buf, unsigned cnt)

+#endif

 {

     jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj);

     return static_cast<int>(VSIFReadL(buf, 1, cnt, fileobj->fp));

 }

+#ifndef PRIjas_seqent

-static int JPEG2000_VSIL_write(jas_stream_obj_t *obj, char *buf, int cnt)

+static int JPEG2000_VSIL_write(jas_stream_obj_t *obj, const char *buf, int cnt)

+#else

+static int JPEG2000_VSIL_write(jas_stream_obj_t *obj, const char *buf, unsigned int cnt)

+#endif

 {

     jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj);

     return static_cast<int>(VSIFWriteL(buf, 1, cnt, fileobj->fp));