s_scalbn.c: Add missing float.h include

This caused LDBL_MANT_DIG to not be defined and therefore the scalbnl
alias was not being emitted for double==long double platforms.

Fixes:		760b2ffc ("Update scalbn* functions to the musl versions")
Reported by:	Jenkins

3 files changed, 5 insertions, 9 deletions

diff --git a/lib/libc/gen/ldexp.c b/lib/libc/gen/ldexp.c
index 878271576313..cbbcf0782387 100644
--- a/lib/libc/gen/ldexp.c
+++ b/lib/libc/gen/ldexp.c
@@ -7,3 +7,4 @@ __FBSDID("$FreeBSD$");
  */
 #define scalbn ldexp
 #include "../../msun/src/s_scalbn.c"
+#undef scalbn
diff --git a/lib/msun/src/s_scalbn.c b/lib/msun/src/s_scalbn.c
index 219cd8f0c989..3de663f8b670 100644
--- a/lib/msun/src/s_scalbn.c
+++ b/lib/msun/src/s_scalbn.c
@@ -1,3 +1,4 @@
+#include <float.h>
 #include <math.h>
 #include <stdint.h>
 
@@ -32,7 +33,7 @@ double scalbn(double x, int n)
 	return x;
 }
 
-#if (LDBL_MANT_DIG == 53)
+#if (LDBL_MANT_DIG == 53) && !defined(scalbn)
 __weak_reference(scalbn, ldexpl);
 __weak_reference(scalbn, scalbnl);
 #endif
diff --git a/lib/msun/src/s_scalbnl.c b/lib/msun/src/s_scalbnl.c
index 65a9415b0d21..a79f79b33480 100644
--- a/lib/msun/src/s_scalbnl.c
+++ b/lib/msun/src/s_scalbnl.c
@@ -8,13 +8,7 @@
  * manipulation rather than by actually performing an
  * exponentiation or a multiplication.
  */
-
-#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
-long double scalbnl(long double x, int n)
-{
-	return scalbn(x, n);
-}
-#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
+#if (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
 long double scalbnl(long double x, int n)
 {
 	union IEEEl2bits u;
@@ -42,6 +36,6 @@ long double scalbnl(long double x, int n)
 	u.xbits.expsign = 0x3fff + n;
 	return x * u.e;
 }
+__strong_reference(scalbnl, ldexpl);
 #endif
 
-__strong_reference(scalbnl, ldexpl);