Track compiler options

[khsa1]

Have experiment track and record changes to compiler options.

[zbeekman]

This may be hard because different files in any given application can be compiled with different flags. Need to think about a smart way to do this. Obviously some tuning flags like -fast or -xHOST or -xAVX512 etc. will most likely be applied to each source file when compiling that executable or library.

[zbeekman]

Perhaps the correct way to do this would be to create a dict keyed by output files which would mean parsing the compiler invocation to detect -o foo?