RealView Compilation Tools Compiler Reference Guide - ARM ...

Standard C Implementation Definition
B.1.12
Preprocessing directives
The ISO standard C header files can be referred to as described in the standard, for
example, #include .
Quoted names for includable source files are supported. The compiler accepts host
filenames or UNIX filenames. For UNIX filenames on non-UNIX hosts, the compiler
tries to translate the filename to a local equivalent.
The recognized #pragma directives are shown in Pragmas on page 4-49.
B.1.13
Library functions
The ISO C library variants are listed in About the runtime libraries on page 1-2 in the
Libraries Guide.
The precise nature of each C library is unique to the particular implementation. The
generic ARM C library has, or supports, the following features:
• The macro NULL expands to the integer constant 0.
• If a program redefines a reserved external identifier such as printf, an error might
occur when the program is linked with the standard libraries. If it is not linked
with standard libraries, no error is detected.
• The __aeabi_assert() function prints details of the failing diagnostic on stderr
and then calls the abort() function:
*** assertion failed: expression, file name, line number
Note
The behavior of the assert macro depends on the conditions in operation at the
most recent occurrence of #include . See Exiting from the program on
page 2-37 in the Libraries Guide for more information.
For implementation details of mathematical functions, macros, locale, signals, and
input/output see Chapter 2 The C and C++ Libraries in the Libraries Guide.
B-8 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A
Non-Confidential