5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local

*** 25,44 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #if defined(ELFOBJ)
  #pragma weak logb = __logb
  #pragma weak _logb = __logb
- #endif
  
  #include "libm.h"
  #include "xpg6.h"       /* __xpg6 */
  #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  
! #if defined(USE_FPSCALE) || defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * v: high part of a non-zero subnormal |x|; w: low part of |x|
   */
--- 25,42 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #pragma weak logb = __logb
  #pragma weak _logb = __logb
  
  #include "libm.h"
  #include "xpg6.h"       /* __xpg6 */
  #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  
! #if defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * v: high part of a non-zero subnormal |x|; w: low part of |x|
   */
*** 57,77 ****
          if (v & 0xf0)
                  r += 4, v >>= 4;
          v <<= 1;
          return (r + ((0xffffaa50 >> v) & 0x3));
  }
! #endif  /* defined(USE_FPSCALE) */
  
  double
  logb(double x) {
          int *px = (int *) &x, k = px[HIWORD] & ~0x80000000;
  
          if (k < 0x00100000) {
                  if ((px[LOWORD] | k) == 0)
                          return (_SVID_libm_err(x, x, 45));
                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
! #if defined(USE_FPSCALE) || defined(__x86)
                          x *= two52;
                          return ((double) (((px[HIWORD] & 0x7ff00000) >> 20)
                                  - 1075));
  #else
                          return ((double) ilogb_subnormal(k, px[LOWORD]));
--- 55,75 ----
          if (v & 0xf0)
                  r += 4, v >>= 4;
          v <<= 1;
          return (r + ((0xffffaa50 >> v) & 0x3));
  }
! #endif  /* defined(__x86) */
  
  double
  logb(double x) {
          int *px = (int *) &x, k = px[HIWORD] & ~0x80000000;
  
          if (k < 0x00100000) {
                  if ((px[LOWORD] | k) == 0)
                          return (_SVID_libm_err(x, x, 45));
                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
! #if defined(__x86)
                          x *= two52;
                          return ((double) (((px[HIWORD] & 0x7ff00000) >> 20)
                                  - 1075));
  #else
                          return ((double) ilogb_subnormal(k, px[LOWORD]));