21.3.2 Compiler Settings Macro

The following symbols are defined if compiler features are enabled.

Table 21-2. Compiler Settings Macros/Symbols
Symbol	Description
`__OPTIMIZATION_LEVEL__`	Set to the value of the big `O` number. For example, both `-Os` and `-O2` would be set to `2`.
`__OPTIMIZE_SIZE__`	Defined if `-Os` enabled, undefined otherwise.
`__LARGE_ARRAYS__`	Set to `1` for `-menable-large-arrays`, set to `0` otherwise.

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