5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/common/complex/csin.c
          +++ new/usr/src/lib/libm/common/complex/csin.c

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END

  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24   24   */
  25   25  /*
  26   26   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27   27   * Use is subject to license terms.
  28   28   */
  29   29  
  30      -#pragma weak csin = __csin
       30 +#pragma weak __csin = csin
  31   31  
  32   32  /* INDENT OFF */
  33   33  /*
  34   34   * dcomplex csin(dcomplex z);
  35   35   *
  36   36   * If z = x+iy, then since csin(iz) = i*csinh(z),  we have
  37   37   *
  38   38   * csin(z)      = csin((-1)*(-z)) = csin(i*i*(-z))
  39   39   *              = i*csinh(i*(-z)) = i*csinh(i*(-x-yi))
  40   40   *              = i*csinh(y-ix)

  41   41   *              = -Im(csinh(y-ix))+i*Re(csinh(y-ix))
  42   42   */
  43   43  /* INDENT ON */
  44   44  
  45   45  #include "libm.h"
  46   46  #include "complex_wrapper.h"
  47   47  
  48   48  dcomplex
  49   49  csin(dcomplex z) {
  50   50          double x, y;
  51   51          dcomplex ans, ct;
  52   52  
  53   53          x = D_RE(z);
  54   54          y = D_IM(z);
  55   55          D_RE(z) = y;
  56   56          D_IM(z) = -x;
  57   57          ct = csinh(z);
  58   58          D_RE(ans) = -D_IM(ct);
  59   59          D_IM(ans) = D_RE(ct);
  60   60          return (ans);
  61   61  }

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