Merge pull request #1242 from DLR-AMR/fix-const-expr #123

Job	Run time
preparation (OFF) / cmake_preparation	1m 0s
preparation (ON) / cmake_preparation	1m 11s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 43s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	8m 45s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	2m 55s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	23m 58s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	41m 29s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	10m 18s
t8code_tests (OFF, Debug) / t8code_cmake_tests	8m 26s
t8code_tests (OFF, Release) / t8code_cmake_tests	3m 27s
t8code_tests (ON, Debug) / t8code_cmake_tests	14m 4s
t8code_tests (ON, Release) / t8code_cmake_tests	3m 51s
	2h 3m 7s

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