Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

Compiler options can also be specified in the 

QCCAVR

 environment variable. The 

compiler automatically appends the value of this variable to every command line, so it 
provides a convenient method of specifying options that are required for every 
compilation. 

The following environment variables can be used with the AVR IAR C/C++ Compiler:

The AVR IAR C/C++ Compiler returns status information to the operating system 
which can be tested in a batch file. 

The following command line error codes are supported:

The following table summarizes the compiler command line options:

C_INCLUDE

Specifies directories to search for include files; for example: 

C_INCLUDE=c:\program files\iar 

systems\embedded workbench 

4.n\avr\inc;c:\headers

QCCAVR 

Specifies command line options; for example: QCCAVR=-lA 

asm.lst -z9

0

Compilation successful, but there may have been warnings.

1

There were warnings, provided that the option 

--warnings_affect_exit_code

 was used.

2

There were non-fatal errors or fatal compilation errors making the compiler abort.

3

There were fatal errors.

--char_is_signed

Treats char as signed

--cpu=cpu

Specifies a processor variant

--cross_call_passes=N

Cross-call optimization