libm: add scalbf, gammaf, significandf wrappers.

 This makes in possible to enable test/math
 (not it compiles, but has lots of test failures).

libm/Makefile.in

@@ -78,7 +78,7 @@ FL_MOBJ := \
 	log1pf.o log2f.o logbf.o logf.o lrintf.o lroundf.o modff.o nearbyintf.o \
 	nextafterf.o powf.o remainderf.o remquof.o rintf.o roundf.o \
 	scalblnf.o scalbnf.o sinf.o sinhf.o sqrtf.o tanf.o tanhf.o \
-	tgammaf.o truncf.o cargf.o llrintf.o
+	tgammaf.o truncf.o cargf.o llrintf.o scalbf.o gammaf.o significandf.o
 
 LD_MOBJ := acoshl.o acosl.o asinhl.o asinl.o atan2l.o atanhl.o atanl.o cargl.o cbrtl.o \
 	ceill.o copysignl.o coshl.o cosl.o erfcl.o erfl.o exp2l.o expl.o \

libm/float_wrappers.c

@@ -77,7 +77,6 @@ float       tanf(float);
 float       tanhf(float);
 #endif
 
-
 #ifdef L_acosf
 float acosf (float x)
 {
@@ -543,3 +542,24 @@ float fmaf (float x, float y, float z)
 	return (float) fma( (double)x, (double)y, (double)z );
 }
 #endif
+
+#ifdef L_scalbf
+float scalbf (float x, float y)
+{
+	return (float) scalb( (double)x, (double)y );
+}
+#endif
+
+#ifdef L_gammaf
+float gammaf (float x)
+{
+	return (float) gamma( (double)x );
+}
+#endif
+
+#ifdef L_significandf
+float significandf (float x)
+{
+	return (float) significand( (double)x );
+}
+#endif

test/Makefile

@@ -38,7 +38,6 @@ endif
 ifeq ($(HAS_NO_THREADS),y)
 	DIRS := $(filter-out pthread,$(DIRS))
 endif
-DIRS := $(filter-out math,$(DIRS))
 
 test check all: run