COMP: handle Shark dependency to openmp using REQUIRED_FLAGS

It is not possible to handle OpenMP as a ThirdParty module, because it is processed before any module in the main CMakeLists.txt. Instead, Shark must declare its dependencies via variables such as SHARK_REQUIRED_CXX_FLAGS and co.

The same thing is done for ITK.

Related to #1592 (closed)

Maybe add this explanation:

It is not possible to handle OpenMP as a ThirdParty module, because it is processed before any module in the main CMakeLists.txt. Instead, Shark must declare its dependencies via variables such as SHARK_REQUIRED_CXX_FLAGS and co.

Somewhere in a comment in the cmake code? It might help a future reader to understand the cmake logic.

added 1 commit

• f903ded2 - DOC: document the role and limits of OTB_USE_OPENMP

Compare with previous version

Done

mentioned in commit 054aeb7c

merged