https://github.com/steve-m/librtlsdr/pull/38

From ea6a86d8e792430faa3a8161ee99f2bc392875d1 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@chromium.org>
Date: Fri, 3 Feb 2017 15:44:18 -1000
Subject: [PATCH] fix builds with newer compilers & C standards

The meaning of "inline" has changed when "static" is not used.
Since none of these functions are used outside of their respective
files, mark them as static to avoid build errors where funcs are
not inlined (based on compiler flags too).
---
 src/rtl_adsb.c  | 8 ++++----
 src/rtl_power.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/rtl_adsb.c b/src/rtl_adsb.c
index e611e78f3dad..a3bfa7f36b5e 100644
--- a/src/rtl_adsb.c
+++ b/src/rtl_adsb.c
@@ -182,7 +182,7 @@ int magnitute(uint8_t *buf, int len)
 	return len/2;
 }
 
-inline uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d)
+static inline uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d)
 /* takes 4 consecutive real samples, return 0 or 1, BADSAMPLE on error */
 {
 	int bit, bit_p;
@@ -223,17 +223,17 @@ inline uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d
 	return BADSAMPLE;
 }
 
-inline uint16_t min16(uint16_t a, uint16_t b)
+static inline uint16_t min16(uint16_t a, uint16_t b)
 {
 	return a<b ? a : b;
 }
 
-inline uint16_t max16(uint16_t a, uint16_t b)
+static inline uint16_t max16(uint16_t a, uint16_t b)
 {
 	return a>b ? a : b;
 }
 
-inline int preamble(uint16_t *buf, int i)
+static inline int preamble(uint16_t *buf, int i)
 /* returns 0/1 for preamble at index i */
 {
 	int i2;
diff --git a/src/rtl_power.c b/src/rtl_power.c
index aa7a138a8cd3..a7a43bbd2507 100644
--- a/src/rtl_power.c
+++ b/src/rtl_power.c
@@ -249,7 +249,7 @@ void sine_table(int size)
 	}
 }
 
-inline int16_t FIX_MPY(int16_t a, int16_t b)
+static inline int16_t FIX_MPY(int16_t a, int16_t b)
 /* fixed point multiply and scale */
 {
 	int c = ((int)a * (int)b) >> 14;
-- 
2.11.0