kc3-lang/gnulib/doc/posix-functions/getopt.texi

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  Date : 2017-07-06T01:10:39
  

  doc: Update for MSVC 14.
  
  * doc/posix-headers/*.texi: Add info about MSVC 14.
  * doc/posix-functions/*.texi: Likewise.
  * doc/pastposix-functions/*.texi: Likewise.
  * doc/glibc-headers/*.texi: Likewise.
  * doc/glibc-functions/*.texi: Likewise.
  

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• doc/posix-functions/getopt.texi

• @node getopt
  @section @code{getopt}
  @findex getopt
  
  POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/getopt.html}
  
  Gnulib module: getopt-posix or getopt-gnu
  
  The module @code{getopt-gnu} has support for ``long options'' and for
  ``options that take optional arguments''.  Compared to the API defined by POSIX,
  it adds a header file @code{<getopt.h>} and a function @code{getopt_long}.
  
  Portability problems fixed by either Gnulib module @code{getopt-posix} or @code{getopt-gnu}:
  @itemize
  @item
  This function is missing on some platforms:
  MSVC 14.
  @item
  The value of @code{optind} after a missing required argument is wrong
  on some platforms:
  Mac OS X 10.5, AIX 7.1, mingw.
  @end itemize
  
  Portability problems fixed by Gnulib module @code{getopt-gnu}:
  @itemize
  @item
  The function @code{getopt} does not support the @samp{+} flag in the options
  string on some platforms:
  Mac OS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11.
  @item
  The function @code{getopt} does not obey the combination of @samp{+}
  and @samp{:} flags in the options string on some platforms:
  glibc 2.11.
  @item
  The function @code{getopt} does not obey the @samp{-} flag in the options
  string when @env{POSIXLY_CORRECT} is set on some platforms:
  Cygwin 1.7.0.
  @item
  The function @code{getopt} does not support options with optional arguments
  on some platforms:
  Mac OS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1,
  Solaris 11 2010-11, Cygwin 1.5.x.
  @item
  The function @code{getopt_long} is missing on some platforms:
  AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 9, MSVC 14, Interix 3.5.
  @item
  The function @code{getopt_long} does not support abbreviated long options
  where all disambiguations are equivalent on some platforms:
  OpenBSD 5.0.
  @item
  The function @code{getopt_long_only} is missing on some platforms:
  Mac OS X 10.3, FreeBSD 5.2.1, NetBSD 5.0, AIX 5.1, HP-UX 11, IRIX 6.5,
  OSF/1 5.1, Solaris 9, mingw, MSVC 14, Interix 3.5.
  @item
  This function crashes if the option string includes @code{W;} on some
  platforms:
  glibc 2.14.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  The default behavior of the glibc implementation of @code{getopt} allows
  mixing option and non-option arguments on the command line in any order.
  Other implementations, such as the one in Cygwin, enforce strict POSIX
  compliance: they require that the option arguments precede the non-option
  arguments.  This is something to watch out in your program's
  testsuite.
  @item
  The glibc implementation allows a complete reset of the environment,
  including re-checking for @env{POSIXLY_CORRECT}, by setting
  @code{optind} to 0.  Several BSD implementations provide @code{optreset},
  causing a reset by setting it non-zero, although it does not
  necessarily re-read @env{POSIXLY_CORRECT}.  Solaris @code{getopt} does
  not support either reset method, but does not maintain state that
  needs the extra level of reset.
  @item
  On some platforms, this function does not set the stream error
  indicator on attempts to write to a read-only stream:
  glibc 2.13, Cygwin 1.7.9.
  @end itemize
  

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