kc3-lang/gnulib/lib/logf.c

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• Hash : 7073cb03
  Author :
  Date : 2012-03-10T00:55:48
  

  logf: Work around OSF/1 5.1 bug.
  
  * lib/math.in.h (logf): Override if REPLACE_LOGF is 1.
  * lib/logf.c (logf): If logf exists, use it and provide just the
  workaround.
  * m4/logf.m4 (gl_FUNC_LOGF_WORKS): New macro.
  (gl_FUNC_LOGF): Invoke it. Set REPLACE_LOGF.
  * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_LOGF.
  * modules/math (Makefile.am): Substitute REPLACE_LOGF.
  * modules/logf (configure.ac): Consider REPLACE_LOGF.
  (Depends-on): Update conditions.
  * doc/posix-functions/logf.texi: Mention the OSF/1 5.1 problem.
  

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• lib/logf.c

• /* Natural logarithmic function.
     Copyright (C) 2011-2012 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <math.h>
  
  float
  logf (float x)
  #undef logf
  {
  #if HAVE_LOGF
    /* Work around the OSF/1 5.1 bug.  */
    if (x == 0.0f)
      /* Return -Infinity.  */
      return -1.0f / 0.0f;
    return logf (x);
  #else
    return (float) log ((double) x);
  #endif
  }
  

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