OTB_WRAP_PYTHON=OFF and OTB_WRAP_PYTHON3=ON leads to chaotic behavior of OTB cmake configuration
Description
With options OTB_WRAP_PYTHON=OFF and OTB_WRAP_PYTHON3=ON (with all Python interpreters and libs installed on my system), I need to configure otb twice to complete the configuration process. The first iteration triggers an error in otb-module-init.cmake from SWIG module. If you run the cmake command again the configuration complete without error.
The issue seems related to the call to macros swap_cache_variables and swap_variables which are called to swap varaibles from Python2 to Python 3:
OTB cmake: a great example of a chaotic system :)
Steps to reproduce
cmake -DOTB_WRAP_PYTHON=OFF -DOTB_WRAP_PYTHON3=ON $src_dir
The output of the first configuration is:
CMake Error at Modules/Wrappers/SWIG/otb-module-init.cmake:60 (set): set given invalid arguments for CACHE mode. Call Stack (most recent call first): Modules/Wrappers/SWIG/otb-module-init.cmake:80 (swap_cache_variable) CMake/OTBModuleEnablement.cmake:394 (include) CMakeLists.txt:342 (include)
Run the configuration again (without any other modification): cmake .
CMake 3.5.1 successfully configured OTB using Unix Makefiles generator
======================= End of OTB cmake summary =======================
-- Configuring doneConfiguration information
Ubuntu 14.04