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diff -Nur gcc-4.2.4.orig/gcc/toplev.h gcc-4.2.4/gcc/toplev.h
--- gcc-4.2.4.orig/gcc/toplev.h 2007-09-01 17:28:30.000000000 +0200
+++ gcc-4.2.4/gcc/toplev.h 2017-06-30 22:54:25.600188422 +0200
@@ -150,38 +150,6 @@
/* Return true iff flags are set as if -ffast-math. */
extern bool fast_math_flags_set_p (void);
-/* Return log2, or -1 if not exact. */
-extern int exact_log2 (unsigned HOST_WIDE_INT);
-
-/* Return floor of log2, with -1 for zero. */
-extern int floor_log2 (unsigned HOST_WIDE_INT);
-
-/* Inline versions of the above for speed. */
-#if GCC_VERSION >= 3004
-# if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
-# define CLZ_HWI __builtin_clzl
-# define CTZ_HWI __builtin_ctzl
-# elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
-# define CLZ_HWI __builtin_clzll
-# define CTZ_HWI __builtin_ctzll
-# else
-# define CLZ_HWI __builtin_clz
-# define CTZ_HWI __builtin_ctz
-# endif
-
-extern inline int
-floor_log2 (unsigned HOST_WIDE_INT x)
-{
- return x ? HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x) : -1;
-}
-
-extern inline int
-exact_log2 (unsigned HOST_WIDE_INT x)
-{
- return x == (x & -x) && x ? (int) CTZ_HWI (x) : -1;
-}
-#endif /* GCC_VERSION >= 3004 */
-
/* Functions used to get and set GCC's notion of in what directory
compilation was started. */
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