meson.build - enable debug compatible optimizations in debug modes

[Architector4]

According to man gcc:

Optimize debugging experience. -Og should be the optimization level of choice for the standard edit-compile-debug cycle, offering a reasonable level of optimization while maintaining fast compilation and a good debugging experience. It is a better choice than -O0 for producing debuggable code because some compiler passes that collect debug information are disabled at -O0.

TLDR: it's a no-brainer to enable for debug builds. I'm running the game in debug nowadays, and using this genuinely just makes it run way faster lol

[HeliumAnt]

Do not hardcode these in the build files, setup your build environment correctly instead using meson configure --debug or debugoptimized buildtype. Flatpak releases are also built with debug symbols

[Architector4]

Huh. Never underestimate the complexity C++ codebase build systems I guess lmao

[Architector4]

Oh wait, it gets even deeper: build type debug specifically adds -O0, killing optimizations, but build type debugoptimized specifically adds -O2, adding many optimizations, which in turn removes some debug info. To achieve the actually proper optimizations for debugging, one needs to use --optimization=g specifically.

why is meson like this lmao

[HeliumAnt]

it's all very well documented. Using the build system to do these things means it's much more compatible between compilers. also though gcc says -Og is optimized for debugging, it doesn't actually work that well. in a lot of cases it still causes symbols to be missing or misplaced. -O2 mostly isn't even that much worse for debugging (so long as the symbols are generated)

[Architector4]

Eh, fair. I guess I was just not expecting there to be a different debug build type in Meson, or this setting to not be that good apparently lol