Determines whether the compiler treats
common symbols as global definitions.
The compiler does not treat common symbols as
This option determines whether the compiler treats common
symbols as global definitions and to allocate memory for each symbol at compile
compiler to treat common symbols as global definitions. When using this option,
you can only have a common variable declared in one module; otherwise, a link
time error will occur for multiple defined symbols.
Normally, a file-scope
declaration with no initializer and without the
keyword "int i;" is
represented as a common symbol. Such a symbol is treated as an external
reference. However, if no other compilation unit has a global definition for
the name, the linker allocates memory for it.
Data > Allow gprel
Addressing of Common Data Variables