Attempt to detect incorrect/improveable incorrect linker flags

Is your feature request related to a problem? Please describe.

I use CMake RelWithDebInfo builds - I don't use Release as I'm never going to distribute something if I don't have debug symbols for it :)

It seems that this disables some of the usual release mode linker flags, in particular:

• /INCREMENTAL:NO - SizeBench does warn about this
• /OPT:ICF
• /OPT:REF

Describe the solution you'd like

It seems like SizeBench could make a reasonable guess that /OPT:ICF or /OPT:REF were not passed, and suggest I enable them.

Describe alternatives you've considered

doing it with sizebench without 'magic' :)

I eventually found all of these flags through looking through SizeBench's reports; for example, the lack of /OPT:REF was obvious from this:

I'm only using one of those WinRT classes, so the majority of them should not be in my executable. After everything else, finding this and turning on /OPT:REF cut my executable from 3MB to 1.5MB

Additional context

Thank you so much for this incredible tool. I read the 2021 blog post last night, and this morning I easily cut my executable from 12.5MB to 1.5MB.

Start by reviewing SizeBench’s existing warning for /INCREMENTAL:NO and the reports that expose linker flags. Determine how /OPT:ICF and /OPT:REF can be detected or reasonably inferred for CMake RelWithDebInfo builds, then verify that the resulting suggestions distinguish enabled and missing flags.