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.global symbol, .globl symbol.global makes the symbol visible to ld. If you define
symbol in your partial program, its value is made available to
other partial programs that are linked with it. Otherwise,
symbol takes its attributes from a symbol of the same name
from another file linked into the same program.
Both spellings (‘.globl’ and ‘.global’) are accepted, for compatibility with other assemblers.
On the HPPA, .global is not always enough to make it accessible to other
partial programs. You may need the HPPA-only .EXPORT directive as well.
See HPPA Assembler Directives.