Fix test suite compat with ghostscript 9.50.

anntzer · anntzer · commit 276acc26faa2 · 2019-10-28T21:48:40.000+01:00
ghostscript 9.50 defaults to -dSAFER (https://www.ghostscript.com/doc/9.50/Use.htm#Safer) which prevents the converter from writing png files resulting from conversion from pdf. Fix that by passing -dNOSAFER, which was the default on older ghostscripts (and backcompatible). Needed to pass the test suite on e.g. an up-to-date Arch Linux.
diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py
@@ -130,7 +130,7 @@ def __call__(self, orig, dest):
         if not self._proc:
             self._proc = subprocess.Popen(
                 [mpl._get_executable_info("gs").executable,
-                 "-dNOPAUSE", "-sDEVICE=png16m"],
+                 "-dNOSAFER", "-dNOPAUSE", "-sDEVICE=png16m"],
                 # As far as I can see, ghostscript never outputs to stderr.
                 stdin=subprocess.PIPE, stdout=subprocess.PIPE)
             try:
