Using the GNU Compiler Collection (GCC): Variable Attributes

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6.32 Specifying Attributes of Variables

The keyword __attribute__ allows you to specify special attributes of variables or structure fields. This keyword is followed by an attribute specification inside double parentheses. Some attributes are currently defined generically for variables. Other attributes are defined for variables on particular target systems. Other attributes are available for functions (see Function Attributes), labels (see Label Attributes), enumerators (see Enumerator Attributes), statements (see Statement Attributes), and for types (see Type Attributes). Other front ends might define more attributes (see Extensions to the C++ Language).

See Attribute Syntax, for details of the exact syntax for using attributes.

• Common Variable Attributes:
• AVR Variable Attributes:
• Blackfin Variable Attributes:
• H8/300 Variable Attributes:
• IA-64 Variable Attributes:
• M32R/D Variable Attributes:
• MeP Variable Attributes:
• Microsoft Windows Variable Attributes:
• MSP430 Variable Attributes:
• Nvidia PTX Variable Attributes:
• PowerPC Variable Attributes:
• RL78 Variable Attributes:
• SPU Variable Attributes:
• V850 Variable Attributes:
• x86 Variable Attributes:
• Xstormy16 Variable Attributes:

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