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6.61.5 Darwin Pragmas

The following pragmas are available for all architectures running the Darwin operating system. These are useful for compatibility with other Mac OS compilers.

mark tokens...
This pragma is accepted, but has no effect.
options align=alignment
This pragma sets the alignment of fields in structures. The values of alignment may be mac68k, to emulate m68k alignment, or power, to emulate PowerPC alignment. Uses of this pragma nest properly; to restore the previous setting, use reset for the alignment.
segment tokens...
This pragma is accepted, but has no effect.
unused (var [, var]...)
This pragma declares variables to be possibly unused. GCC does not produce warnings for the listed variables. The effect is similar to that of the unused attribute, except that this pragma may appear anywhere within the variables' scopes.