CMake compilation flags as categorical properties

[islas]

TYPE: enhancement

KEYWORDS: cmake, compilation, flags

SOURCE: internal

DESCRIPTION OF CHANGES: Problem: In preparation for alternative core selection, there is a broader range of flags that must be set and controlled throughout the project. This includes being able to set flags on a per-source basis to override certain flags that are normally applied wholly to all source within a CMake target. An example of this is disabling double precision on an individual file when that option is being used.

Solution: Categorizing the flags first allows for easy application and selection of particular sets of flags for the multiple libraries and binaries created. Second, for the core library, using pseudo-inherited CMake properties between targets and source files allows for granular control of these flag categories.