Check for a cbrtf function

CMakeLists.txt

@@ -510,6 +510,7 @@ CHECK_SYMBOL_EXISTS(_aligned_malloc  malloc.h HAVE__ALIGNED_MALLOC)
 CHECK_SYMBOL_EXISTS(lrintf math.h HAVE_LRINTF)
 CHECK_SYMBOL_EXISTS(modff  math.h HAVE_MODFF)
 CHECK_SYMBOL_EXISTS(log2f  math.h HAVE_LOG2F)
+CHECK_SYMBOL_EXISTS(cbrtf  math.h HAVE_CBRTF)
 
 IF(HAVE_FLOAT_H)
     CHECK_SYMBOL_EXISTS(_controlfp float.h HAVE__CONTROLFP)

common/math_defs.h

@@ -29,6 +29,13 @@ static inline float log2f(float f)
 }
 #endif
 
+#ifndef HAVE_CBRTF
+static inline float cbrtf(float f)
+{
+    return powf(f, 1.0f/3.0f);
+}
+#endif
+
 #define DEG2RAD(x)  ((float)(x) * (F_PI/180.0f))
 #define RAD2DEG(x)  ((float)(x) * (180.0f/F_PI))
 

config.h.in

@@ -89,6 +89,9 @@
 /* Define if we have the log2f function */
 #cmakedefine HAVE_LOG2F
 
+/* Define if we have the cbrtf function */
+#cmakedefine HAVE_CBRTF
+
 /* Define if we have the strtof function */
 #cmakedefine HAVE_STRTOF