From: "Ronald S. Bultje" <[email protected]>
Add a fallback implementation if it does not exist.
---
configure | 2 ++
libavutil/libm.h | 4 ++++
2 files changed, 6 insertions(+)
diff --git a/configure b/configure
index 3442797..06bf2c0 100755
--- a/configure
+++ b/configure
@@ -1059,6 +1059,7 @@ HAVE_LIST="
asm_mod_y
attribute_may_alias
attribute_packed
+ cbrtf
closesocket
cmov
dcbzl
@@ -2918,6 +2919,7 @@ done
check_lib math.h sin -lm && LIBM="-lm"
enabled vaapi && require vaapi va/va.h vaInitialize -lva
+check_mathfunc cbrtf
check_mathfunc exp2
check_mathfunc exp2f
check_mathfunc llrint
diff --git a/libavutil/libm.h b/libavutil/libm.h
index 783f3cd..b4d5af0 100644
--- a/libavutil/libm.h
+++ b/libavutil/libm.h
@@ -28,6 +28,10 @@
#include "config.h"
#include "attributes.h"
+#if !HAVE_CBRTF
+#define cbrtf(x) powf(x, 1.0/3.0)
+#endif /* HAVE_CBRTF */
+
#if !HAVE_EXP2
#undef exp2
#define exp2(x) exp((x) * 0.693147180559945)
--
1.7.9.4
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