avoid infinite recursion

The makefile parse causes dh to be run recursively.

Before, dh would just immediatly fail with "unknown sequence", but
now it has to run the makefile parse to calculate the sequences, so an
earlier bailout is needed.

1 files changed, 6 insertions, 3 deletions

diff --git a/dh b/dh
index 2241c648..59d5ee07 100755
--- a/dh
+++ b/dh
@@ -346,9 +346,12 @@ if (! defined $sequence) {
 }
 # make -B causes the rules file to be run as a target.
 # Also support completly empty override targets.
-# Note: it's not safe to use rules_explicit_target before this check.
+# Note: it's not safe to use rules_explicit_target before this check,
+# since it causes dh to be run.
+my $dummy_target="debhelper-fail-me";
 if ($sequence eq 'debian/rules' ||
-    $sequence =~ /^override_dh_/) {
+    $sequence =~ /^override_dh_/ ||
+    $sequence eq $dummy_target) {
 	exit 0;
 }
 
@@ -814,7 +817,7 @@ sub rules_explicit_target {
 		my $processing_targets = 0;
 		my $not_a_target = 0;
 		my $current_target;
-		open(MAKE, "LC_ALL=C make -Rrnpsf debian/rules debhelper-fail-me 2>/dev/null |");
+		open(MAKE, "LC_ALL=C make -Rrnpsf debian/rules $dummy_target 2>/dev/null |");
 		while (<MAKE>) {
 			if ($processing_targets) {
 				if (/^# Not a target:/) {