support/scripts: fix graph-depends when run with python3

Make graph-depends script opening the output file in text mode since
only ascii characters will be written.

This change fixes the following error occuring when the default host
python interpreter is python3:

  make: Entering directory '/opt/buildroot'
  Getting targets
  Getting dependencies for ['toolchain-external', 'toolchain', 'busybox', ...]
  Getting dependencies for ['host-python3', 'host-pkgconf', 'host-gettext', ...]
  Getting dependencies for ['host-libxml2', 'host-swig', 'host-m4', ...]
  Getting version for ['toolchain-external', 'toolchain', 'busybox', ...]
  Traceback (most recent call last):
    File "/opt/buildroot/support/scripts/graph-depends", line 425, in <module>
      outfile.write("digraph G {\n")
  TypeError: a bytes-like object is required, not 'str'
  Makefile:807: recipe for target 'graph-depends' failed
  make[1]: *** [graph-depends] Error 1
  Makefile:84: recipe for target '_all' failed
  make: *** [_all] Error 2
  make: Leaving directory '/opt/buildroot'

While with python2, adding 'b' to the openning mode has no effect on
Linux (c.f. [2]), the above error is expected with python3 (c.f. [1]).

Therefore, just open the outfile in default (i.e. text) mode.

[1] https://docs.python.org/3/library/functions.html#open
[2] https://docs.python.org/2/library/functions.html#open

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/support/scripts/graph-depends b/support/scripts/graph-depends
index a00eb9d47bd6541e30e71aeee36983c8ded7268c..cb00383c0f81ea569445fef43900065c827a17fd 100755 (executable)
--- a/support/scripts/graph-depends
+++ b/support/scripts/graph-depends
@@ -73,7 +73,7 @@ else:
     if check_only:
         sys.stderr.write("don't specify outfile and check-only at the same time\n")
         sys.exit(1)
-    outfile = open(args.outfile, "wb")
+    outfile = open(args.outfile, "w")
 
 if args.package is None:
     mode = MODE_FULL