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6.34 Specifying Attributes of Variables

You can use attributes to specify special properties of variables, function parameters, or structure, union, and, in C++, class members. 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).

GCC provides two different ways to specify attributes: the traditional GNU syntax using __attribute__ ((...)) annotations, and the newer standard C and C++ syntax using [[...]] with the gnu:: prefix on attribute names. Note that the exact rules for placement of attributes in your source code are different depending on which syntax you use. See Attribute Syntax, for details.

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

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