AN3350 datasheet(115/185 Pages) STMICROELECTRONICS

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AN3350

Declaration specifications

Doc ID 018512 Rev 2

115/185

14.4

Attribute specifications

14.4.1

__attribute__((deprecated))

Specifies that the compiler must issue a warning when a program refers to an object.

Syntax

variable-declaration __attribute__((deprecated));

variable-definition __attribute__((deprecated));

function-declaration __attribute__((deprecated));

function-definition __attribute__((deprecated));

Remarks

This attribute instructs the compiler to issue a warning when a program refers to a function

or variable. Use this attribute to discourage programmers from using functions and variables

that are obsolete or will soon be obsolete.

Example 71 Example of deprecated attribute

int velocipede(int speed) __attribute__((deprecated));

int bicycle(int speed);

int f(int speed)

{

return velocipede(speed); /* Warning. */

}

int g(int speed)

{

return bicycle(speed * 2); /* OK */

}

14.4.2

__attribute__((force_export))

Prevents a function or static variable from being dead-stripped.

Syntax

function-declaration __attribute__((force_export));

function-definition __attribute__((force_export));

variable-declaration __attribute__((force_export));

variable-definition __attribute__((force_export));

Remarks

This attribute specifies that the linker must not dead-strip a function or static variable even if

the linker determines that the rest of the program does not refer to the object.

AN3350 데이터시트(PDF) 115 Page - STMicroelectronics