kc3-lang/gnulib/doc/posix-functions/log2.texi

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• Hash : 6bf08d5f
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  Date : 2012-03-11T22:12:34
  

  log2-ieee: Work around test failure on NetBSD 5.1 and Solaris 10.
  
  * m4/log2-ieee.m4: New file.
  * m4/log2.m4 (gl_FUNC_LOG2): If gl_FUNC_LOG2_IEEE is present, test
  whether log2 works with a minus zero argument. Replace it if not.
  * modules/log2-ieee (Files): Add m4/log2-ieee.m4.
  (configure.ac): Invoke gl_FUNC_LOG2_IEEE.
  * doc/posix-functions/log2.texi: Mention the log2-ieee module.
  

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• doc/posix-functions/log2.texi

• @node log2
  @section @code{log2}
  @findex log2
  
  POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log2.html}
  
  Gnulib module: log2 or log2-ieee
  
  Portability problems fixed by either Gnulib module @code{log2} or @code{log2-ieee}:
  @itemize
  @item
  This function is missing on some platforms:
  FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, older IRIX 6.5,
  Solaris 9, MSVC 9, Interix 3.5.
  @item
  This function is not declared on some platforms:
  IRIX 6.5.
  @item
  This function is only provided as a macro on some platforms:
  Cygwin 1.5.x.
  @item
  This function returns a wrong value for a minus zero argument on some platforms:
  OSF/1 5.1.
  @item
  This function returns slightly wrong values for exact powers of 2 on some platforms:
  Cygwin 1.7.9.
  @end itemize
  
  Portability problems fixed by Gnulib module @code{log2-ieee}:
  @itemize
  @item
  This function returns a wrong value for a negative argument on some platforms:
  NetBSD 5.1, Solaris 11 2011-11.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @end itemize
  

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