Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

This chapter explains how to set the compiler options from the command line, 

and gives detailed reference information about each option.

Refer to the AVR® IAR Embedded Workbench™ IDE User Guide

for information 

about the compiler options available in IAR Embedded Workbench and how 

to set them.

To set compiler options from the command line, include them on the command line after 
the 

iccavr

 command, either before or after the source filename. For example, when 

compiling the source 

prog.c

, use the following command to generate an object file 

with debug information:

iccavr prog --debug

Some options accept a filename, included after the option letter with a separating space. 
For example, to generate a listing to the file 

list.lst

:

iccavr prog -l list.lst 

Some other options accept a string that is not a filename. The string is included after the 
option letter, but without a space. For example, to define a symbol:

iccavr prog -DDEBUG=1 

Generally, the order of options on the command line, both relative to each other and to 
the source filename, is not significant. There is, however, one exception: when you use 
the -

I

 option, the directories are searched in the same order as they are specified on the 

command line.

Note that a command line option has a short name and/or a long name:

●

A short option name consists of one character, with or without parameters. You 
specify it with a single dash, for example 

-e

●

A long name consists of one or several words joined by underscores, and it may 
have parameters. You specify it with double dashes, for example 

--char_is_signed

.