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 The C Preprocessor
 ******************
 
 The C preprocessor implements the macro language used to transform C,
 C++, and Objective-C programs before they are compiled.  It can also be
 useful on its own.
 

Menu

 
* Overview
* Header Files
* Macros
* Conditionals
* Diagnostics
* Line Control
* Pragmas
* Other Directives
* Preprocessor Output
* Traditional Mode
* Implementation Details
* Invocation
* Environment Variables
* GNU Free Documentation License
* Index of Directives
* Option Index
* Concept Index
 
  --- The Detailed Node Listing ---
 
 Overview
 
* Character sets
* Initial processing
* Tokenization
* The preprocessing language
 
 Header Files
 
* Include Syntax
* Include Operation
* Search Path
* Once-Only Headers
* Alternatives to Wrapper #ifndef
* Computed Includes
* Wrapper Headers
* System Headers
 
 Macros
 
* Object-like Macros
* Function-like Macros
* Macro Arguments
* Stringification
* Concatenation
* Variadic Macros
* Predefined Macros
* Undefining and Redefining Macros
* Directives Within Macro Arguments
* Macro Pitfalls
 
 Predefined Macros
 
* Standard Predefined Macros
* Common Predefined Macros
* System-specific Predefined Macros
* C++ Named Operators
 
 Macro Pitfalls
 
* Misnesting
* Operator Precedence Problems
* Swallowing the Semicolon
* Duplication of Side Effects
* Self-Referential Macros
* Argument Prescan
* Newlines in Arguments
 
 Conditionals
 
* Conditional Uses
* Conditional Syntax
* Deleted Code
 
 Conditional Syntax
 
* Ifdef
* If
* Defined
* Else
* Elif
 
 Implementation Details
 
* Implementation-defined behavior
* Implementation limits
* Obsolete Features
* Differences from previous versions
 
 Obsolete Features
 
* Obsolete Features
 
    Copyright (C) 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free
 Software Foundation, Inc.
 
    Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.2 or
 any later version published by the Free Software Foundation.  A copy of
 the license is included in the section entitled "GNU Free Documentation
 License".
 
    This manual contains no Invariant Sections.  The Front-Cover Texts
 are (a) (see below), and the Back-Cover Texts are (b) (see below).
 
    (a) The FSF's Front-Cover Text is:
 
    A GNU Manual
 
    (b) The FSF's Back-Cover Text is:
 
    You have freedom to copy and modify this GNU Manual, like GNU
 software.  Copies published by the Free Software Foundation raise
 funds for GNU development.
 

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