support/graph-depends: fix out-of-tree usage

graph-depends calls make to get the list of packages, and the
dependencies of each package.

When called out-of-tree, the Makefile is a wrapper that calls
the real Makefile, so make will spit out a line like:
  make -C /path/to/buildroot O=/path/to/build-dir show-targets

which graph-depends wrongly believes is part of the target list.

Be silent when calling make, as we really only want the target
and dependency lists.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/scripts/graph-depends

@@ -53,7 +53,7 @@ unknownpkgs = []
 # list is used as the starting point for full dependency graphs
 def get_targets():
     sys.stderr.write("Getting targets\n")
-    cmd = ["make", "show-targets"]
+    cmd = ["make", "-s", "show-targets"]
     p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     output = p.communicate()[0].strip()
     if p.returncode != 0:
@@ -67,7 +67,7 @@ def get_targets():
 # formatted as a Python list.
 def get_depends(pkg):
     sys.stderr.write("Getting dependencies for %s\n" % pkg)
-    cmd = ["make", "%s-show-depends" % pkg]
+    cmd = ["make", "-s", "%s-show-depends" % pkg]
     p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     output = p.communicate()[0].strip()
     if p.returncode != 0: