Atmel CAVR-4 Manual De Usuario

CAVR-4

Descriptions of options

Reference Guide

--warnings_are_errors

--warnings_are_errors

Use this option to make the compiler treat all warnings as errors. If the compiler 
encounters an error, no object code is generated. Warnings that have been changed into 
remarks are not treated as errors.

Note: Any diagnostic messages that have been reclassified as warnings by the compiler 
option 

--diag_warning

 or the 

#pragma

 

diag_warning

 directive will also be treated 

as errors when 

--warnings_are_errors

 is used.

For additional information, see --diag_warning, page 177 and #pragma diag_warning, 
page 219.

To set the equivalent option in IAR Embedded Workbench, select 
Project>Options>C/C++ Compiler>Diagnostics.

-y

-y

Use this option to override the default placement of constants and literals.

Without this option, constants and literals are placed in an external 

const

 segment, 

segmentbasename_C

. With this option, constants and literals will instead be placed in 

the initialized 

segmentbasename_I

 data segments that are copied from the 

segmentbasename_ID

 segments by the system startup code.

Note that 

-y

 is implicit in the tiny memory model.

This option can be combined with the option 

--initializers_in_flash

; see 

--initializers_in_flash, page 184 for additional information.

This option is related to the Code options in the C/C++ Compiler category in IAR 
Embedded Workbench.

-z

-z[2|3|6|9] 

Use this option to make the compiler optimize the code for minimum size. If no 
optimization option is specified, 

-z3

 is used by default. 

The following table shows how the optimization levels are mapped:

2

None* (Best debug support)

3

Low*

6

Medium

9

High (Maximum optimization)