Enable the /LTCG switch where applicable.

[Hoikas]

CMake does not by default enable link-time code generation (read: optimizations). This adds the instrumentation to opt-in to such a thing without manual user intervention. This can be turned off by setting -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF. While I am skeptical that LTCG will offer any significant performance benefit, it does seem like the produced plClient.exe is smaller (down from ~22,000 KB to ~16,000 KB).

[zrax]

That much of a size reduction is probably worth it alone, regardless of performance... However, did you verify this doesn't remove those "unreferenced" objects MSVC sometimes warns about?

[Hoikas]

I noticed today that there seems to be an observable benefit to using this in debug mode. I didn't bother measuring anything though because meh, debug performance.

did you verify this doesn't remove those "unreferenced" objects MSVC sometimes warns about?

Good question. Off the top of my head, the only ones I could think of are in the console commands. Those still seem to be working. Are there any others I should be looking for in particular?

[zrax]

If the ones you found in the console are working, it's probably safe to say it works...