dh_auto_install: In c11, skip creating unrelated directories

Signed-off-by: Niels Thykier <niels@thykier.net>

3 files changed, 17 insertions, 2 deletions

diff --git a/debhelper.pod b/debhelper.pod
index e19a6c8b..a940ab8c 100644
--- a/debhelper.pod
+++ b/debhelper.pod
@@ -663,6 +663,14 @@ F<./configure>.
 The B<dh_installman> helper will now prefer detecting the language from the
 path name rather than the extension.
 
+=item -
+
+The B<dh_auto_install> helper will now only create the destination
+directory it needs.  Previously, it would create the package build
+directory for all packages.  This will not affect packages that only
+build with debhelper commands, but it may expose bugs in commands not
+included in debhelper.
+
 =back
 
 =back
diff --git a/debian/changelog b/debian/changelog
index b583a27f..229b21f6 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -60,6 +60,9 @@ debhelper (10.5) UNRELEASED; urgency=medium
   * Dh_Lib.pm: Emulate "install -d" with File::Path to avoid a fork+exec
     for creating directories.  For simplicity, the verbose output still
     claim debhelper uses "install -d" for this.
+  * dh_auto_install: In compat 11, do noot create package build
+    directories (except if one of them happens to be the default
+    "destdir" for dh_auto_install).
 
   [ Iain Lane ]
   * Dh_Lib: Re-add warning + exit 0 for the -i/-a shortcut that was
diff --git a/dh_auto_install b/dh_auto_install
index 3463d534..fa0c6692 100755
--- a/dh_auto_install
+++ b/dh_auto_install
@@ -81,8 +81,12 @@ if (!$destdir) {
 }
 $destdir = File::Spec->rel2abs($destdir, cwd());
 
-# Ensure that all debian/<pkg> directories exist
-install_dir(map { tmpdir($_) } @{$dh{DOPACKAGES}});
+if (compat(10)) {
+	# Ensure that all debian/<pkg> directories exist
+	install_dir(map { tmpdir($_) } @{$dh{DOPACKAGES}});
+} else {
+	install_dir($destdir);
+}
 
 buildsystems_do("install", $destdir);