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5.11. Preprocessing directives

  • [How sequences in both forms of header names are mapped to headers or external source file names (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 (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 (6.10.1).]

  • [The places that are searched for an included <> delimited header, and how the places are specified or the header is identified (6.10.2).]

  • [How the named source file is searched for in an included "" delimited header (6.10.2).]

  • [The method by which preprocessing tokens (possibly resulting from macro expansion) in a #include directive are combined into a header name (6.10.2).]

  • [The nesting limit for #include processing (6.10.2).]

    GCC imposes a limit of 200 nested #includes.

  • [Whether the # operator inserts a \ character before the \ character that begins a universal character name in a character constant or string literal (]

  • [The behavior on each recognized non-STDC #pragma directive (6.10.6).]

  • [The definitions for __DATE__ and __TIME__ when respectively, the date and time of translation are not available (6.10.8).]

    If the date and time are not available, __DATE__ expands to "??? ?? ????" and __TIME__ expands to "??:??:??".

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