alsamixer: fix build on uClibc

exp10 is a glibc extension, which isn't supported on uClibc. Luckily,
exp10() is trivial to compute based on exp(), so add a wrapper for
the uClibc case.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/alsamixer/volume_mapping.c b/alsamixer/volume_mapping.c
index 9cacad8126114a4334b44dc3683f79eefcf6088a..1c0d7c45e6686239464e1b0bbc8983ea57f3914f 100644 (file)
--- a/alsamixer/volume_mapping.c
+++ b/alsamixer/volume_mapping.c
@@ -37,6 +37,11 @@
 #include <stdbool.h>
 #include "volume_mapping.h"
 
+#ifdef __UCLIBC__
+/* 10^x = 10^(log e^x) = (e^x)^log10 = e^(x * log 10) */
+#define exp10(x) (exp((x) * log(10)))
+#endif /* __UCLIBC__ */
+
 #define MAX_LINEAR_DB_SCALE    24
 
 static inline bool use_linear_dB_scale(long dBmin, long dBmax)