Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 1. Using the compiler

To create the required runtime environment you should choose a runtime library and set 
library options. You may also need to override certain library modules with your own 
customized versions.

There are two different sets of runtime libraries provided:

●

The IAR DLIB Library, which supports ISO/ANSI C and C++. This library also 
supports floating-point numbers in IEEE 754 format and it can be configured to 
include different levels of support for locale, file descriptors, multibyte characters, 
et cetera.

●

The IAR CLIB Library is a light-weight library, which is not fully compliant with 
ISO/ANSI C. Neither does it fully support floating-point numbers in IEEE 754 
format or does it support Embedded C++. (This library is used by default).

The runtime library you choose can be one of the prebuilt libraries, or a library that you 
have customized and built yourself. The IAR Embedded Workbench IDE provides a 
library project template for both libraries, that you can use for building your own library 
version. This gives you full control of the runtime environment. If your project only 
contains assembler source code, there is no need to choose a runtime library.

For detailed information about the runtime environments, see the chapters The DLIB 
runtime environment and The CLIB runtime environment, respectively.

The way you set up a runtime environment and locate all the related files differs 
depending on which build interface you are using—the IAR Embedded Workbench IDE 
or the command line.

To choose a library, choose Project>Options, and click the Library Configuration tab 
in the General Options category. Choose the appropriate library from the Library 
drop-down menu.

Note that for the DLIB library there are two different configurations—Normal and 
Full—which include different levels of support for locale, file descriptors, multibyte 
characters, et cetera. See Library configurations, page 55, for more information.

Based on which library configuration you choose and your other project settings, the 
correct library file is used automatically. For the device-specific include files, a correct 
include path is set up.