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-fcommon, -fno-common

Generates common zero-initialized definitions for tentative definitions.

Tentative definitions are declarations of variables with no storage class and no initializer.

The -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 in different files cause a L6200E: Symbol multiply defined linker error because the individual definitions clash with each other.

The -fcommon option places the zero-initialized definitions in a common block. This common definition is not associated with any particular section or object, so multiple definitions resolve to a single definition at link time.


The default is -fcommon.

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