Re: [FFADO-devel] FFADO-mixer and python

[Jonathan W. <jw...@ju...>]

Hi Vladimir

Further to my previous message, I just tried your build script on my
development system.  It's running an older version of gcc so I had to remove
"-fno-strict-aliasing-ggdb" from COMPILE_FLAGS.  Furthermore, the system
python is python2, so that's what scons was running under.  Scons is v2.4.1
and python is 2.7.17.

With those notes, FFADO trunk (r2783) compiled successfully using your build
script.  This makes it a little difficult for me to debug this issue
further.

The most obvious difference is the scons version.  Perhaps scons 3.1.2 is
doing something that earlier versions did not do.

I added your print statement to SConstruct in the same location as you:

  print("!!!!!!!! %s\n" % (env.Dump())) # Added by me for debug

Taking a look at the output, I see that it executes several times.  The
first is in response to the "scons -c" command.  I can confirm that
LIBRAW1394_FLAGS does not appear in that output.  However, I don't think
it's expected to because a full SConstruct execution is not done when a
clean operation is requested.  The absence of LIBRAW1394_FLAGS in this case
certainly didn't trigger an error.

The second execution reported many more items in the environment - as I'd
expect, since this is the compilation pass.  In particular, I noted that
LIBRAW1394_FLAGS was present (which explains why I had no errors).  Its
value was that reported by pkg-config rather than the environment variable
set in your build.sh, but the main point is that it was present.  This is
clearly very different behaviour to what you see on your system.

As to why the manual setting of LIBRAW1394_FLAGS isn't preserved, I think
the respective conf.GetPKGFlags() probably overrides it.

I am still very confused about why the script as it stands was working for
David given your difficulties.  He was, I believe, using scons 3.1 with
python3, which is very close to what's on your system.  It is therefore
puzzling as to why you are seeing a problem.

As before, any further insights you can obtain from your system would be
helpful.

Rest assured I would very much like to get to the bottom of what's going on
here and get a fix in to trunk.

Regards
  jonathan