So, what's the difference? Here's the -O0 description from man gcc: -O0 Reduce compilation time and make debugging produce the expected results. This is the default. man gcc clearly says -Og "should be the optimization level of choice for the standard edit-compile-debug cycle", though.

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Most optimizations are completely disabled at -O0 or if an -O level is not set on the command line, even if individual optimization flags are specified. Similarly, -Og suppresses many optimization passes.

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0O (zero O) or 0-O may refer to: 0o, 0_o, and 0.o, a kaomoji emoticon that may refer to shock, disturbance, or confusion 0-operand instruction set 0o, or zero object, a mathematics term for a simultaneously initial and terminal object 0O, also ZO, an abbreviation for zero order Zero-order hold, model of the practical signal reconstruction done by a conventional digital-to-analog converter Zero ...

If I use -fverbose-asm to find out exactly which flags O1 is enabling compared to O0, and then disable them manually, why is the assembler produced still so massively different?

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The /O options control various optimizations that help you create code for maximum speed or minimum size. /O1 sets a combination of optimizations that generate minimum size code. /O2 sets a combination of optimizations that optimizes code for maximum speed. /Ob controls inline function expansion ...

The default is optimization off. This results in the fastest compile times, but GNAT makes absolutely no attempt to optimize, and the generated programs are considerably larger and slower than when optimization is enabled. You can use the -O switch (the permitted forms are -O0, -O1-O2, -O3, and -Os) to gcc to control the optimization level: -O0