Tells the compiler to treat common symbols as global definitions.
Linux: Data > Allow gprel Addressing of Common Data Variables
IA-32, IntelŪ EM64T, IntelŪ ItaniumŪ architecture
| Linux: | -f[no-]common |
| Windows: | None |
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| OFF | -fcommon |
This option tells the compiler to treat common symbols as global definitions and to allocate memory for each symbol at compile time.
It enables the compiler to treat common variables as if they were defined, allowing the use of GP-relative (gprel) addressing of common data variables.
Normally, a file-scope declaration with no initializer and without the extern or static 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. The -fno-common option allows the compiler to use a more efficient way to access the symbol.
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