Add support for setting the log callback with libusb_set_option/libusb_init_context

This commit effectively deprecates libusb_set_log_cb by adding support for
setting the callback in either libusb_set_option or libusb_init_context. Since
the libusb_set_log_cb is already in use we can not easily deprecate it without
first incrementing the major version. We may do that in the future.

Closes #1265

Signed-off-by: Nathan Hjelm <hjelmn@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/libusb/libusbi.h b/libusb/libusbi.h
index 72d2568..030e6b6 100644
--- a/libusb/libusbi.h
+++ b/libusb/libusbi.h
@@ -814,6 +814,7 @@ struct usbi_option {
   int is_set;
   union {
     int ival;
+    libusb_log_cb log_cbval;
   } arg;
 };