Updated patch for dealing with __infinity and small data areas

[Michael Meissner]

I've applied the following patch after feedback from Jeff Johnson.

2000-07-28  Michael Meissner  <meissner@redhat.com>

	* libc/include/math.h (__infinity): Declare as an array without
	bounds to get around small data support.  Rewrite Cygwin support
	to be more general.
	* libm/math/s_infconst.c (__infinity): Ditto.
	* libm/mathfp/s_infconst.c (__infinity): Ditto.

*** newlib/libc/include/math.h.~1~	Fri Jul 28 12:23:56 2000
--- newlib/libc/include/math.h	Fri Jul 28 11:25:19 2000
*************** union __dmath
*** 21,33 ****
    double d;
  };
  
  #if !defined(__CYGWIN__) || defined(__INSIDE_CYGWIN__) || defined(_COMPILING_NEWLIB)
! extern const union __dmath __infinity;
  #else
! extern __declspec(dllimport) const union __dmath __infinity;
  #endif
  
! #define HUGE_VAL (__infinity.d)
  
  #endif /* ! defined (HUGE_VAL) */
  
--- 21,43 ----
    double d;
  };
  
+ /* Declare this as an array without bounds so that no matter what small data
+    support a port and/or library has, this reference will be via the general
+    method for accessing globals.
+ 
+    Also under Cygwin, the library exports a pointer to the real value, so we
+    need to properly dereference it.  */
+ #ifndef __INFINITY_DECL__
  #if !defined(__CYGWIN__) || defined(__INSIDE_CYGWIN__) || defined(_COMPILING_NEWLIB)
! #define __INFINITY_DECL__
  #else
! #define __INFINITY_DECL__ __declspec(dllimport)
! #endif
  #endif
  
! extern __INFINITY_DECL__ const union __dmath __infinity[];
! 
! #define HUGE_VAL (__infinity[0].d)
  
  #endif /* ! defined (HUGE_VAL) */
  
*** newlib/libm/math/s_infconst.c.~1~	Thu Feb 17 14:39:51 2000
--- newlib/libm/math/s_infconst.c	Fri Jul 28 10:38:40 2000
***************
*** 6,15 ****
  
  #ifndef _DOUBLE_IS_32BITS
  #ifdef __IEEE_BIG_ENDIAN
! const union __dmath __infinity = { 0x7ff00000, 0 };
  #else
! const union __dmath __infinity = { 0, 0x7ff00000 };
  #endif
  #else /* defined (_DOUBLE_IS_32BITS) */
! const union __dmath __infinity = { 0x7f800000, 0 };
  #endif /* defined (_DOUBLE_IS_32BITS) */
--- 6,15 ----
  
  #ifndef _DOUBLE_IS_32BITS
  #ifdef __IEEE_BIG_ENDIAN
! const union __dmath __infinity[1] = {{ 0x7ff00000, 0 }};
  #else
! const union __dmath __infinity[1] = {{ 0, 0x7ff00000 }};
  #endif
  #else /* defined (_DOUBLE_IS_32BITS) */
! const union __dmath __infinity[1] = {{ 0x7f800000, 0 }};
  #endif /* defined (_DOUBLE_IS_32BITS) */
*** newlib/libm/mathfp/s_infconst.c.~1~	Thu Feb 17 14:39:52 2000
--- newlib/libm/mathfp/s_infconst.c	Fri Jul 28 10:38:09 2000
***************
*** 6,15 ****
  
  #ifndef _DOUBLE_IS_32BITS
  #ifdef __IEEE_BIG_ENDIAN
! const union __dmath __infinity = { 0x7ff00000, 0 };
  #else
! const union __dmath __infinity = { 0, 0x7ff00000 };
  #endif
  #else /* defined (_DOUBLE_IS_32BITS) */
! const union __dmath __infinity = { 0x7f800000, 0 };
  #endif /* defined (_DOUBLE_IS_32BITS) */
--- 6,15 ----
  
  #ifndef _DOUBLE_IS_32BITS
  #ifdef __IEEE_BIG_ENDIAN
! const union __dmath __infinity[1] = {{ 0x7ff00000, 0 }};
  #else
! const union __dmath __infinity[1] = {{ 0, 0x7ff00000 }};
  #endif
  #else /* defined (_DOUBLE_IS_32BITS) */
! const union __dmath __infinity[1] = {{ 0x7f800000, 0 }};
  #endif /* defined (_DOUBLE_IS_32BITS) */

-- 
Michael Meissner, Red Hat, Inc.
PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886, USA
Work:	  meissner@redhat.com		phone: +1 978-486-9304
Non-work: meissner@spectacle-pond.org	fax:   +1 978-692-4482