CFFI grovel passes a broadcast-stream to (run-program ... :output $)

[Anton Vodonosov]

As you can see from this TravisCI log of cl-plus-ssl, ECL fails when it tries to grovel static-vectors library with ERROR:

    :OUTPUT argument to RUN-PROGRAM does not have a file handle:
    #<broadcast stream 00000000038cd5a0>

https://travis-ci.org/cl-plus-ssl/cl-plus-ssl/jobs/181217279

And indeed, in https://github.com/cffi/cffi/blob/master/grovel/grovel.lisp#L282 cffi-grovel does pass a broadcast-stream to run-program.

According to Fare "this is unlikely to work, not just on ECL, but on many other implementations with similar non-unreasonable limitations.
if you want the output to two streams, the portable thing to do is capture to a string, and princ the string to two streams."

The TravisCI build is run on ECL 16.1.2, ASDF 3.1.5.4 at 2016-12-05
(http://ccl.clozure.com/irc-logs/lisp/lisp-2016-12.txt 2016-12-05T01:04:25Z)

[Anton Vodonosov (avodonosov)]

My original TravisCI issue isn't caused by cffi-grovel directly, it's a result of the :silent t flag passed to (ql:quickload ...). The :silent t feature is implemented in quicklisp by binding *standard-output* to a dummy broadcast stream. More details here: https://github.com/roswell/roswell/issues/195

But I'm not closing the issue because a place where broadcast-stream is passed to run-program exists in cffi.

BTW, in a recent change in ASDF there is an explicit check on ECL that the stream was associated with a file descriptor: https://github.com/fare/asdf/blob/46eb49bf88ebd99efb2b511a62a79d778cc0240b/uiop/run-program.lisp#L479