Several unit tests fail when compiled with gcc

[taketwo]

I mentioned that when compiled with gcc 4.9.0 several unit tests consistently fail. This does not happen with clang 3.4.1 on my machine and clang 3.4 on Travis.

The tests in question are:

• 6 - test_non_linear
• 29 - feature_cppf_estimation
• 49 - filters_sampling
• 73 - a_registration_test

[VictorLamoine]

Dell M6700
Ubuntu 14.04 x64
cmake version 2.8.12.2
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
VTK 5.8

96% tests passed, 4 tests failed out of 100

Total Test time (real) = 104.11 sec

The following tests FAILED:
      6 - test_non_linear (Failed)
     29 - feature_cppf_estimation (Failed)
     51 - filters_sampling (Failed)
     77 - a_registration_test (Failed)
Errors while running CTest
make: *** [test] Erreur 8

The other test units pass for me as of today.

[jspricke]

@sdmiller: as far as I can see, you introduced them, can you have a look?

[frozar]

My configuration:
Ubuntu 16.04.3
cmake version 3.5.1
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
VTK 6.2.0

95% tests passed, 5 tests failed out of 104

Total Test time (real) = 3201.40 sec

The following tests FAILED:
	 13 - common_eigen (Failed)
	 25 - feature_cppf_estimation (Failed)
	 27 - feature_pfh_estimation (Failed)
	 48 - filters_sampling (Failed)
	 73 - a_octree_test (OTHER_FAULT)
[...]
make: *** [tests] Erreur 2

PS : almost 1 hour to run 104 unit tests... Do these test be really unit?

[taketwo]

Obsolete, all tests pass nowadays.