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How global data should be accessed depends on what you are building:
Open
vector if it wants any,
and then can access it via A4.
By default, or with `-mno-own-gp', compiled code will access global data via (a negative offset from) A5. Shared libraries and other special purpose programs should be compiled with `-mown-gp', and will use (a positive offset from) A4 (see see section 1.1 Palm OS-specific GCC options).