Index: math.h
===================================================================
RCS file: /cvs/src/src/newlib/libc/include/math.h,v
retrieving revision 1.46
diff -u -p -r1.46 math.h
--- math.h	14 Oct 2010 20:14:33 -0000	1.46
+++ math.h	3 Dec 2010 01:13:32 -0000
@@ -32,7 +32,7 @@ union __ldmath
 #endif
 
 /* Natural log of 2 */
-#define _M_LOG2_E        0.693147180559945309417
+#define _M_LN2        0.693147180559945309417
 
 #if defined(__GNUC__) && \
   ( (__GNUC__ >= 4) || \
@@ -276,7 +276,7 @@ extern double erf _PARAMS((double));
 extern double erfc _PARAMS((double));
 extern double log2 _PARAMS((double));
 #if !defined(__cplusplus)
-#define log2(x) (log (x) / _M_LOG2_E)
+#define log2(x) (log (x) / _M_LN2)
 #endif
 
 #ifndef __math_68881
@@ -356,7 +356,7 @@ extern float erff _PARAMS((float));
 extern float erfcf _PARAMS((float));
 extern float log2f _PARAMS((float));
 #if !defined(__cplusplus)
-#define log2f(x) (logf (x) / (float) _M_LOG2_E)
+#define log2f(x) (logf (x) / (float_t) _M_LN2)
 #endif
 extern float hypotf _PARAMS((float, float));
 #endif /* ! defined (_REENT_ONLY) */
@@ -546,7 +546,7 @@ extern int matherr _PARAMS((struct excep
 #define M_LN2HI         6.9314718036912381649E-1
 #define M_SQRT3	1.73205080756887719000
 #define M_IVLN10        0.43429448190325182765 /* 1 / log(10) */
-#define M_LOG2_E        _M_LOG2_E
+#define M_LOG2_E        _M_LN2
 #define M_INVLN2        1.4426950408889633870E0  /* 1 / log(2) */
 
 /* Global control over fdlibm error handling.  */