failing tests with gcc-14

I see failing tests, at least TestProlongate maybe others, but not all of them, when compiling the ET (Landau or development) with gcc-14.

This

./utils/Scripts/MakeThornList --master thornlists/einsteintoolkit.th arrangements/CarpetX/TestProlongate/test/test_cc_co_o1.par >thornlists/test_cc_co_o1.th

produces a thornlist one can try this out with. Eg for test_natural_o7.diffs the test system reports

   testprolongate-gf001_count.it000002.x.tsv: substantial differences
      significant differences on 68 (out of 39) lines
      missing  29 lines in new testprolongate-gf001_count.it000002.x.tsv
      maximum absolute difference in column 2 is 0.0166666666666667
      maximum relative difference in column 2 is 0.25

and looking at the log files there seems to be an issue that only a single refinement level is created compared to 2 when compiled with gcc-13:

INFO (CarpetX): Regridding...
INFO (CarpetX): Setting max_grid_size values for all levels before regridding
INFO (CarpetX): ErrorEst patch 0 level 0                                                                INFO (CarpetX): ErrorEst patch 0 level 0 done. Set/clear/total=0/27000/27000=0%/100%/100%               INFO (CarpetX):   old levels 1, new levels 1
INFO (CarpetX):   level 0: 1 boxes, 27000 cells (100%)

so this does not seem to be just some sort of roundoff error thing to me.

Diff of the interesting bit of the log file

 INFO (CarpetX): Regridding...
 INFO (CarpetX): Setting max_grid_size values for all levels before regridding
 INFO (CarpetX): ErrorEst patch 0 level 0
-INFO (CarpetX): ErrorEst patch 0 level 0 done. Set/clear/total=448/26552/27000=2%/98%/100%
-INFO (CarpetX): MakeNewLevelFromCoarse patch 0 level 1
-INFO (CarpetX): SetupLevel patch 0 level 1
-INFO (CarpetX): SetupLevel patch 0 level 1 done.
-INFO (CarpetX): MakeNewLevelFromCoarse patch 0 level 1 done.
-INFO (CarpetX):   old levels 1, new levels 2
+INFO (CarpetX): ErrorEst patch 0 level 0 done. Set/clear/total=0/27000/27000=0%/100%/100%
+INFO (CarpetX):   old levels 1, new levels 1
 INFO (CarpetX):   level 0: 1 boxes, 27000 cells (100%)
-INFO (CarpetX):   level 1: 1 boxes, 7200 cells (3.333%, 3%)
-INFO (CarpetX): Iteration: 1   time: 0.0333333   delta_time: 0.0166667
-INFO (CarpetX): ScheduleTraverseGH iteration 1 CCTK_BASEGRID
-INFO (CarpetX): CallFunction iteration 1 CCTK_BASEGRID: CarpetX::CarpetX_InitError
-INFO (CarpetX): ScheduleTraverseGH iteration 1 CCTK_POSTREGRID
-INFO (CarpetX): CallFunction iteration 1 CCTK_POSTREGRID: TestProlongate::TestProlongate_Sync
-INFO (CarpetX): SyncGroups TESTPROLONGATE::GF000, TESTPROLONGATE::GF001, TESTPROLONGATE::GF010, TESTPROLONGATE::GF011, TESTPROLONGATE::GF100, TESTPROLONGATE::GF101, TESTPROLONGATE::GF110, TESTPROLONGATE::GF111
 INFO (CarpetX): ScheduleTraverseGH iteration 2 CCTK_PRESTEP
 INFO (CarpetX): ScheduleTraverseGH iteration 2 CCTK_EVOL
 INFO (CarpetX): CallFunction iteration 2 TestProlongate_SetValue: TestProlongate::TestProlongate_Set

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