Atmel CAVR-4 Manuale Utente

CAVR-4

Part 2. Compiler reference

_Pragma()

The preprocessor operator 

_Pragma

 can be used in defines and has the equivalent effect 

of the 

#pragma

 directive. The syntax is:

_Pragma("string")

where 

 follows the syntax for the corresponding pragma directive. For example:

#if NO_OPTIMIZE

  #define NOOPT _Pragma("optimize=2")

#else

  #define NOOPT

#endif

See the chapter Pragma directives.

Note: The 

-e

 option—enable language extensions—is not required.

_ _PRETTY_FUNCTION_ _

Use this symbol inside a function body to make it expand into a string, with the function 
name including parameter types and return type as context. The result might, for 
example, look like this: 

"void func(char)"

This symbol is useful for assertions and other trace utilities. These symbols require that 
language extensions are enabled, see -e, page 179.

See also, __func__, __FUNCTION__, page 230.

_ _STDC_ _

This predefined symbol expands to the number 1. This symbol can be tested with 

#ifdef

 to detect whether the compiler in use adheres to ISO/ANSI C.

_ _STDC_VERSION_ _

ISO/ANSI C and version identifier.

This predefined symbol expands to 

199409L

.

Note: This predefined symbol does not apply in EC++ mode.

_ _TID_ _

Target identifier for the AVR IAR C/C++ Compiler.

Expands to the target identifier which contains the following parts:

●

A target identifier (t) unique for each IAR compiler. For the AVR microcontroller, 
the target identifier is 

90

.

●

The value (

c

) of the 

--cpu

 or 

-v

 option.