add note about allow-stderr

1 files changed, 9 insertions, 0 deletions

diff --git a/dh_elpa_test b/dh_elpa_test
index 09fe39d..334f234 100755
--- a/dh_elpa_test
+++ b/dh_elpa_test
@@ -259,10 +259,19 @@ if ($autopkgtest) {
         no warnings 'once';
         open(OLDERR, ">&", \*STDERR);
     }
+
     # redirect stderr to stdout while we run our tests
+
     # emacs --batch and ERT itself both produce a lot of output on
     # stderr even when there has been no error, and adt-run interprets
     # this as a test failure
+
+    # Recent autopkgtest has a 'allow-stderr' restriction prevents
+    # that interpretation.  However, relying on that would require
+    # 'allow-stderr' to be specified in the d/tests/control file for
+    # every package using dh_elpa_test.  It's cleaner just to redirect
+    # here.
+
     open(STDERR, ">&STDOUT");
     # unbuffer them to ensure lines appear in the right order
     select STDERR; $| = 1;