```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>
```

 Split Close Expand all Collapse all
```          --- old/usr/src/lib/libm/common/C/acosh.c
+++ new/usr/src/lib/libm/common/C/acosh.c
```
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```  20   20   */
21   21
22   22  /*
24   24   */
25   25  /*
27   27   * Use is subject to license terms.
28   28   */
29   29
30      -#pragma weak acosh = __acosh
30 +#pragma weak __acosh = acosh
31   31
32   32  /* INDENT OFF */
33   33  /*
34   34   * acosh(x)
35   35   * Method :
36   36   *      Based on
37   37   *              acosh(x) = log [ x + sqrt(x*x-1) ]
38   38   *      we have
39   39   *              acosh(x) := log(x)+ln2, if x is large; else
40   40   *              acosh(x) := log(2x-1/(sqrt(x*x-1)+x)) if x > 2; else
41   41   *              acosh(x) := log1p(t+sqrt(2.0*t+t*t)); where t = x-1.
42   42   *
43   43   * Special cases:
44   44   *      acosh(x) is NaN with signal if x < 1.
45   45   *      acosh(NaN) is NaN without signal.
46   46   */
47   47  /* INDENT ON */
48   48
49      -#include "libm_synonyms.h"      /* __acosh, __log, __log1p */
50   49  #include "libm_protos.h"        /* _SVID_libm_error */
51   50  #include "libm_macros.h"
52   51  #include <math.h>
53   52
54   53  static const double
55   54          one = 1.0,
56   55          ln2 = 6.93147180559945286227e-01;       /* 3FE62E42, FEFA39EF */
57   56
58   57  double
59   58  acosh(double x) {
```
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