Cmake ignores the list of optimization options and chooses only the last item in the list

[med-ayssar]

Describe the bug
Calling cmake with -Dwith-optimize="item1;item2;...;itemn", only selects the last item in the list, and the other items will be ignored.

[terhorstd]

actually it works in master when using quotes and spaces -Dwith-optimize="-O1 -O2", only the documentation as given in CMakeLists.txt hints at a non-existing functionality concatenating options with ;.

set( with-optimize ON CACHE STRING "Enable user defined optimizations [default=ON (uses '-O2')]. When OFF, no '-O' flag is passed to the compiler. Explicit compiler flags can be given; separate multiple flags by ';'." )