id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc 5350,Extra sensitiveness of gdalwarp average tests,Even Rouault,etourigny,"Etienne, I get failures on the average/mode warping tests on my machine with GCC 4.4.3. I get also similar failures on MinGW (which must be a 4.6.3) which cause the Travis MinGW build to fail systematically (e.g. http://travis-ci.org/rouault/gdal_coverage/builds/16780051). I guess there must numerical precision issues in the rounding done in // compute corners in source crs. Under debugger I see values very close to integers, so depending on compiler version and optimization level, you can easily be below or above the integer boundary. TEST: warp_31 ... Diff at pixel (0, 2) : -13.000000 Diff at pixel (1, 2) : -10.000000 Diff at pixel (2, 2) : -3.000000 Diff at pixel (3, 2) : -1.000000 Diff at pixel (4, 2) : -2.000000 Diff at pixel (5, 2) : 2.000000 Diff at pixel (6, 2) : 1.000000 Diff at pixel (7, 2) : -1.000000 Diff at pixel (8, 2) : 3.000000 Diff at pixel (36, 2) : -15.000000 Diff at pixel (42, 2) : 29.000000 Diff at pixel (4, 17) : 30.000000 Diff at pixel (48, 20) : 31.000000 Diff at pixel (21, 23) : 33.000000 Diff at pixel (3, 50) : -36.000000 Max diff : 36 Number of diffs : 1073 fail line 1004: Image too different from reference TEST: warp_32 ... Diff at pixel (0, 2) : -13.000000 Diff at pixel (1, 2) : -10.111115 Diff at pixel (2, 2) : -2.666672 Diff at pixel (3, 2) : -1.250000 Diff at pixel (4, 2) : -2.277779 Diff at pixel (5, 2) : 1.722221 Diff at pixel (6, 2) : 1.250000 Diff at pixel (7, 2) : -1.000000 Diff at pixel (8, 2) : 3.222221 Diff at pixel (35, 2) : -13.277771 Diff at pixel (36, 2) : -14.416672 Diff at pixel (42, 2) : 29.333328 Diff at pixel (4, 17) : 30.222214 Diff at pixel (48, 20) : 30.833328 Diff at pixel (21, 23) : 32.833328 Diff at pixel (3, 50) : -36.333336 Max diff : 36 Number of diffs : 1118 fail line 1023: Image too different from reference TEST: warp_33 ... Diff at pixel (10, 2) : -17.000000 Diff at pixel (19, 2) : 16.000000 Diff at pixel (24, 2) : -17.000000 Diff at pixel (26, 2) : -25.000000 Diff at pixel (27, 2) : 8.000000 Diff at pixel (38, 2) : -49.000000 Diff at pixel (41, 2) : 41.000000 Diff at pixel (47, 2) : -107.000000 Diff at pixel (48, 2) : -24.000000 Diff at pixel (1, 20) : -115.000000 Diff at pixel (52, 47) : 123.000000 Diff at pixel (28, 50) : -131.000000 Max diff : 131 Number of diffs : 287 fail line 1042: Image too different from reference TEST: warp_34 ... Diff at pixel (10, 2) : -17.000000 Diff at pixel (19, 2) : 16.000000 Diff at pixel (24, 2) : -17.000000 Diff at pixel (26, 2) : -25.000000 Diff at pixel (27, 2) : 8.000000 Diff at pixel (38, 2) : -49.000000 Diff at pixel (41, 2) : 41.000000 Diff at pixel (47, 2) : -107.000000 Diff at pixel (48, 2) : -24.000000 Diff at pixel (1, 20) : -115.000000 Diff at pixel (52, 47) : 123.000000 Diff at pixel (28, 50) : -131.000000 Max diff : 131 Number of diffs : 287 fail line 1061: Image too different from reference TEST: warp_35 ... Diff at pixel (10, 2) : -17.000000 Diff at pixel (19, 2) : 16.000000 Diff at pixel (24, 2) : -17.000000 Diff at pixel (26, 2) : -25.000000 Diff at pixel (27, 2) : 8.000000 Diff at pixel (1, 5) : -17.000000 Diff at pixel (6, 5) : 8.000000 Diff at pixel (10, 5) : -8.000000 Diff at pixel (13, 5) : -16.000000 Diff at pixel (31, 5) : -90.000000 Diff at pixel (6, 17) : 99.000000 Diff at pixel (1, 20) : -115.000000 Max diff : 115 Number of diffs : 103 fail line 1080: Image too different from reference TEST: warp_36 ... Diff at pixel (10, 2) : -17.000000 Diff at pixel (19, 2) : 16.000000 Diff at pixel (24, 2) : -17.000000 Diff at pixel (26, 2) : -25.000000 Diff at pixel (27, 2) : 8.000000 Diff at pixel (38, 2) : -49.000000 Diff at pixel (41, 2) : 41.000000 Diff at pixel (47, 2) : -107.000000 Diff at pixel (48, 2) : -24.000000 Diff at pixel (1, 20) : -115.000000 Diff at pixel (52, 47) : 123.000000 Diff at pixel (28, 50) : -131.000000 Max diff : 131 Number of diffs : 287 fail line 1099: Image too different from reference ",defect,closed,normal,,Autotest,unspecified,normal,fixed,,