(gcc.info.gz) Preprocessing directives implementation

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 4.13 Preprocessing directives
 =============================
 
  Implementation-defined behavior (cpp)Implementation-defined
 behavior, for details of these aspects of implementation-defined
 behavior.
 
    * `How sequences in both forms of header names are mapped to headers
      or external source file names (C90 6.1.7, C99 6.4.7).'
 
    * `Whether the value of a character constant in a constant expression
      that controls conditional inclusion matches the value of the same
      character constant in the execution character set (C90 6.8.1, C99
      6.10.1).'
 
    * `Whether the value of a single-character character constant in a
      constant expression that controls conditional inclusion may have a
      negative value (C90 6.8.1, C99 6.10.1).'
 
    * `The places that are searched for an included `<>' delimited
      header, and how the places are specified or the header is
      identified (C90 6.8.2, C99 6.10.2).'
 
    * `How the named source file is searched for in an included `""'
      delimited header (C90 6.8.2, C99 6.10.2).'
 
    * `The method by which preprocessing tokens (possibly resulting from
      macro expansion) in a `#include' directive are combined into a
      header name (C90 6.8.2, C99 6.10.2).'
 
    * `The nesting limit for `#include' processing (C90 6.8.2, C99
      6.10.2).'
 
    * `Whether the `#' operator inserts a `\' character before the `\'
      character that begins a universal character name in a character
      constant or string literal (C99 6.10.3.2).'
 
    * `The behavior on each recognized non-`STDC #pragma' directive (C90
      6.8.6, C99 6.10.6).'
 
       Pragmas (cpp)Pragmas, for details of pragmas accepted by
      GCC on all targets.   Pragmas Accepted by GCC Pragmas, for
      details of target-specific pragmas.
 
    * `The definitions for `__DATE__' and `__TIME__' when respectively,
      the date and time of translation are not available (C90 6.8.8, C99
      6.10.8).'
 
 

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