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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/47823] #pragma once is documented in a weird spot
Date: Sat, 28 Jan 2012 19:16:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47823

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |documentation
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-01-28
            Summary|#pragma once not documented |#pragma once is documented
                   |                            |in a weird spot
     Ever Confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-28 19:01:42 UTC ---
Confirmed really it is documented but just under #import documentation.  It
really should be under its own:
Another way to prevent a header file from being included more than once
is with the @samp{#pragma once} directive.  If @samp{#pragma once} is
seen when scanning a header file, that file will never be read again, no
matter what.

@samp{#pragma once} does not have the problems that @samp{#import} does,
but it is not recognized by all preprocessors, so you cannot rely on it
in a portable program.