---
configure | 2 ++
libavutil/libm.h | 8 ++++++++
2 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/configure b/configure
index af48ae8..0b55509 100755
--- a/configure
+++ b/configure
@@ -1065,6 +1065,7 @@ HAVE_LIST="
inet_aton
inline_asm
isatty
+ isnan
kbhit
ldbrx
libdc1394_1
@@ -2850,6 +2851,7 @@ disabled vaapi || check_lib va/va.h vaInitialize -lva
check_mathfunc exp2
check_mathfunc exp2f
+check_mathfunc isnan
check_mathfunc llrint
check_mathfunc llrintf
check_mathfunc log2
diff --git a/libavutil/libm.h b/libavutil/libm.h
index 704bcf9..fc2ef71 100644
--- a/libavutil/libm.h
+++ b/libavutil/libm.h
@@ -38,6 +38,14 @@
#define exp2f(x) ((float)exp2(x))
#endif /* HAVE_EXP2F */
+#if !HAVE_ISNAN
+#undef isnan
+#define isnan(x) \
+ (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) :
\
+ sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
+__builtin_isnanf ((float)(x)))
+#endif /* HAVE_ISNAN */
+
#if !HAVE_LLRINT
#undef llrint
#define llrint(x) ((long long)rint(x))
--
1.7.4.4
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