Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

This chapter describes the pragma directives of the AVR IAR C/C++ Compiler.

The pragma directives control the behavior of the compiler, for example how 

it allocates memory, whether it allows extended keywords, and whether it 

outputs warning messages. The pragma directives are preprocessed, which 

means that macros are substituted in a pragma directive. 

The pragma directives are always enabled in the compiler. They are consistent 

with ISO/ANSI C and are very useful when you want to make sure that the 

source code is portable.

The following table shows the pragma directives of the compiler:

#pragma 

basic_template_matching

Makes a template function fully memory-aware

#pragma bitfields

Controls the order of bitfield members

#pragma constseg

Places constant variables in a named segment

#pragma data_alignment

Gives a variable a higher (more strict) alignment

#pragma dataseg

Places variables in a named segment

#pragma diag_default

Changes the severity level of diagnostic messages

#pragma diag_error

Changes the severity level of diagnostic messages

#pragma diag_remark

Changes the severity level of diagnostic messages

#pragma diag_suppress

Suppresses diagnostic messages

#pragma diag_warning

Changes the severity level of diagnostic messages

#pragma include_alias

Specifies an alias for an include file

#pragma inline

Inlines a function

#pragma language

Controls the IAR language extensions

#pragma location

Specifies the absolute address of a variable

#pragma message

Prints a message