Make empty array in struct compatible with C99

If the compiler is known to be running in C99 mode,
use "flexible array members" ("foo[]").

If the compiler is running in any other mode, continue
using the non-standard but widely common "foo[0]" syntax.

diff --git a/libusb/libusb.h b/libusb/libusb.h
index cc9bd3b..fab053e 100644 (file)
--- a/libusb/libusb.h
+++ b/libusb/libusb.h
@@ -747,7 +747,13 @@ struct libusb_transfer {
        int num_iso_packets;
 
        /** Isochronous packet descriptors, for isochronous transfers only. */
-       struct libusb_iso_packet_descriptor iso_packet_desc[0];
+       struct libusb_iso_packet_descriptor iso_packet_desc
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+       [] /* valid C99 code */
+#else
+       [0] /* non-standard, but usually working code */
+#endif
+       ;
 };
 
 int libusb_init(libusb_context **ctx);