define LIBUSB_CALL if not available with old libusb

Signed-off-by: Steve Markgraf <steve@steve-m.de>
12 years ago · 9773ac0b83
parent b38414c15a
commit 9773ac0b83
1 changed files with 10 additions and 0 deletions
--- a/src/rtl-sdr.c
+++ b/src/rtl-sdr.c
@ -29,6 +29,16 @@

 #include <libusb.h>

+/*
+ * All libusb callback functions should be marked with the LIBUSB_CALL macro
+ * to ensure that they are compiled with the same calling convention as libusb.
+ *
+ * If the macro isn't available in older libusb versions, we simply define it.
+ */
+#ifndef LIBUSB_CALL
+#define LIBUSB_CALL
+#endif
+
 #include <rtl-sdr.h>
 #include "tuner_e4000.h"
 #include "tuner_fc0012.h"