The deprecated variable attribute enables the declaration of a deprecated variable without any warnings or errors being issued by the compiler. However, any access to a deprecated variable creates a warning but still compiles. The warning gives the location where the variable is used and the location where it is defined. This helps you to determine why a particular definition is deprecated.

extern int Variable_Attributes_deprecated_0 __attribute__ ((deprecated));
extern int Variable_Attributes_deprecated_1 __attribute__ ((deprecated));
void Variable_Attributes_deprecated_2()
{
    Variable_Attributes_deprecated_0=1;
    Variable_Attributes_deprecated_1=2;
}