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-rw-r--r--include/byteswap.h15
1 files changed, 12 insertions, 3 deletions
diff --git a/include/byteswap.h b/include/byteswap.h
index 4ebd90e3..8689cd57 100644
--- a/include/byteswap.h
+++ b/include/byteswap.h
@@ -3,17 +3,26 @@
 
 #include <stdint.h>
 
-static inline uint16_t __bswap_16(uint16_t __x)
+#if __STDC_VERSION__ >= 199901L
+inline
+#endif
+static uint16_t __bswap_16(uint16_t __x)
 {
 	return __x<<8 | __x>>8;
 }
 
-static inline uint32_t __bswap_32(uint32_t __x)
+#if __STDC_VERSION__ >= 199901L
+inline
+#endif
+static uint32_t __bswap_32(uint32_t __x)
 {
 	return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
 }
 
-static inline uint64_t __bswap_64(uint64_t __x)
+#if __STDC_VERSION__ >= 199901L
+inline
+#endif
+static uint64_t __bswap_64(uint64_t __x)
 {
 	return __bswap_32(__x)+0ULL<<32 | __bswap_32(__x>>32);
 }