Attribute System_Allocator_Alignment (GNAT Reference Manual)

### 4.64 Attribute System_Allocator_Alignment ¶

`Standard'System_Allocator_Alignment` (`Standard` is the only allowed prefix) provides the observable guaranteed to be honored by the system allocator (malloc). This is a static value that can be used in user storage pools based on malloc either to reject allocation with alignment too large or to enable a realignment circuitry if the alignment request is larger than this value.