COMP: update gcc compiler linux kitware factory machine

[Punzo]

Hi @jcfr, would be possible to update the linux factory machine gcc from 4.6 to 4.7 to support OpenMP call reduction max and min? gcc 4.7 supports OpenMP 3.1 which is the one I need.

Or may you keep in mind this when setting up the new infrastructure to compile the Qt5/VTK9 version?

build Error:

pragma omp parallel for schedule(static) reduction(max : max_val), reduction(min : min_val)

http://slicer.cdash.org/viewBuildError.php?buildid=1186462

[Punzo]

well c++11 will require gcc 4.7 as well, so I guess this can wait up to the new release of the binaries of Slicer with Qt5/VTK9/C++11

[Punzo]

reference: https://discourse.slicer.org/t/transition-of-nightly-build-to-qt5-vtk9-cmake-3-9-and-c-11/1918