gdal raster contour/footprint/polygon: fix issue with temporary gpkg file on MacOS

Fixes #13794

Author: rouault

apps/gdalalg_raster_contour.cpp

@@ -264,7 +264,11 @@ bool GDALRasterContourAlgorithm::RunStep(GDALPipelineStepRunContext &ctxt)
             poDstDS->MarkSuppressOnClose();
             if (bRet)
                 bRet = poDstDS->FlushCache() == CE_None;
+#if !defined(__APPLE__)
+            // For some unknown reason, unlinking the file on MacOSX
+            // leads to later "disk I/O error". See https://github.com/OSGeo/gdal/issues/13794
             VSIUnlink(outputFilename.c_str());
+#endif
         }
         m_outputDataset.Set(std::unique_ptr<GDALDataset>(poDstDS));
     }

apps/gdalalg_raster_footprint.cpp

@@ -347,7 +347,11 @@ bool GDALRasterFootprintAlgorithm::RunStep(GDALPipelineStepRunContext &ctxt)
             if (poRetDS && !m_standaloneStep && !outputFilename.empty())
             {
                 bOK = poRetDS->FlushCache() == CE_None;
+#if !defined(__APPLE__)
+                // For some unknown reason, unlinking the file on MacOSX
+                // leads to later "disk I/O error". See https://github.com/OSGeo/gdal/issues/13794
                 VSIUnlink(outputFilename.c_str());
+#endif
                 poRetDS->MarkSuppressOnClose();
             }
             m_outputDataset.Set(std::unique_ptr<GDALDataset>(poRetDS));

apps/gdalalg_raster_polygonize.cpp

@@ -284,7 +284,11 @@ bool GDALRasterPolygonizeAlgorithm::RunStep(GDALPipelineStepRunContext &ctxt)
         if (bTemporaryFile)
         {
             ret = poRetDS->FlushCache() == CE_None;
+#if !defined(__APPLE__)
+            // For some unknown reason, unlinking the file on MacOSX
+            // leads to later "disk I/O error". See https://github.com/OSGeo/gdal/issues/13794
             VSIUnlink(outputFilename.c_str());
+#endif
         }
 
         m_outputDataset.Set(std::move(poRetDS));