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Generates common zero-initialized values for tentative definitions.
Tentative definitions are declarations of variables with no storage class and no initializer.
-fcommon option places the tentative
definitions in a common block. This common definition is not associated with any
particular section or object, so multiple definitions resolve to a single symbol
definition at link time.
-fno-common option generates
individual zero-initialized definitions for tentative definitions. These
zero-initialized definitions are placed in a ZI section in the generated object.
Multiple definitions of the same symbol in different files can cause a
L6200E: Symbol multiply defined linker error, because
the individual definitions clash with each other.
The default is