libusb1_common, ftdi: clarify libusb_open error message

[openocd] / configure.ac

diff --git a/configure.ac b/configure.ac
index 4388573c012a87bafd107efb26acaa820cdf6c29..2d50bee495fa375a726f3dd562c96a9b42fca60f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1200,9 +1200,14 @@ use_libusb0=no
 use_libusb1=no
 if test $build_usb = yes -o $build_usb_ng = yes; then
   if test $check_libusb0 = no -a $build_usb_ng = yes; then
-       AC_CHECK_HEADER([libusb-1.0/libusb.h],
-                       [AC_DEFINE(HAVE_LIBUSB1, 1, [Define if you have libusb-1.0]) check_libusb0=no use_libusb1=yes ],
-                       [ check_libusb0=yes use_libusb1=no ])
+       AC_CHECK_HEADER([libusb-1.0/libusb.h], [
+           AC_DEFINE(HAVE_LIBUSB1, 1, [Define if you have libusb-1.0])
+           check_libusb0=no use_libusb1=yes
+           AC_SEARCH_LIBS([libusb_error_name], [usb-1.0],
+             [AC_DEFINE(HAVE_LIBUSB_ERROR_NAME, 1, [Define if your libusb has libusb_error_name()])],
+             [AC_MSG_WARN([libusb-1 older than 1.0.9 detected, consider updating])])
+         ], [
+           check_libusb0=yes use_libusb1=no ])
   fi
 
   if test $check_libusb0 = yes -o $build_usb = yes; then