Hi,
I am playing around with the extensions interface for the first time and so
I compiled the example, installed the extension in the appropriate folder,
and ran the example "rx_samples_to_file".  If I don't specify an antenna,
it runs successfully.  If I do specify the antenna (e.g., "--ant RX2") it
dies with a segmentation fault at the call usrp->set_rx_antenna().

# using N320
# using head of UHD-4.9 (d589cd50)
# here is the command that dies with the segmentation fault
$ rx_samples_to_file --freq 2450e6 --gain 30 --nsamps 1000 --rate 30.72e6
--args="extension=extension_example" --ant RX2

I then modified the example and determined that all of the "rx_antenna"
commands cause a segmentation fault. Is this a bug or am I doing something
wrong?
Rob
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