15 files changed, 30 insertions, 0 deletions
diff --git a/src/analyze/analyze-verify.h b/src/analyze/analyze-verify.h
index 5c86d9862b..f10c34c4ae 100644
--- a/src/analyze/analyze-verify.h
+++ b/src/analyze/analyze-verify.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include <stdbool.h>
 
 #include "path-lookup.h"
diff --git a/src/compat-libs/linkwarning.h b/src/compat-libs/linkwarning.h
index a2e9534a80..79ece9e7d1 100644
--- a/src/compat-libs/linkwarning.h
+++ b/src/compat-libs/linkwarning.h
@@ -18,6 +18,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #define __make_section_unallocated(section_string)      \
   asm (".section " section_string "\n\t.previous");
 
diff --git a/src/import/import-dkr.h b/src/import/import-dkr.h
index 51aacbe90b..633c767965 100644
--- a/src/import/import-dkr.h
+++ b/src/import/import-dkr.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include "sd-event.h"
 #include "util.h"
 
diff --git a/src/libsystemd-network/dhcp-server-internal.h b/src/libsystemd-network/dhcp-server-internal.h
index eb7d6d44d3..58750c4418 100644
--- a/src/libsystemd-network/dhcp-server-internal.h
+++ b/src/libsystemd-network/dhcp-server-internal.h
@@ -20,6 +20,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include "sd-event.h"
 #include "sd-dhcp-server.h"
 
diff --git a/src/resolve/resolved-dns-domain.h b/src/resolve/resolved-dns-domain.h
index 0888a7846f..36f27ea031 100644
--- a/src/resolve/resolved-dns-domain.h
+++ b/src/resolve/resolved-dns-domain.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  ***/
 
+#pragma once
+
 #include <sys/types.h>
 
 #include "hashmap.h"
diff --git a/src/shared/btrfs-util.h b/src/shared/btrfs-util.h
index d5249d1bf1..1b9c142e5c 100644
--- a/src/shared/btrfs-util.h
+++ b/src/shared/btrfs-util.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include <stdbool.h>
 #include <sys/types.h>
 
diff --git a/src/shared/gpt.h b/src/shared/gpt.h
index 87308b0d2b..add1df420f 100644
--- a/src/shared/gpt.h
+++ b/src/shared/gpt.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include <endian.h>
 
 #include "sd-id128.h"
diff --git a/src/shared/gunicode.h b/src/shared/gunicode.h
index a4b2934a4b..e70818fdd7 100644
--- a/src/shared/gunicode.h
+++ b/src/shared/gunicode.h
@@ -4,6 +4,8 @@
  *  Copyright 2000, 2005 Red Hat, Inc.
  */
 
+#pragma once
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
diff --git a/src/shared/login-shared.h b/src/shared/login-shared.h
index b2787c9c62..a79f20c1b1 100644
--- a/src/shared/login-shared.h
+++ b/src/shared/login-shared.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include <stdbool.h>
 
 bool session_id_valid(const char *id);
diff --git a/src/shared/sigbus.h b/src/shared/sigbus.h
index 25593af2d4..23edc6d9cb 100644
--- a/src/shared/sigbus.h
+++ b/src/shared/sigbus.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 void sigbus_install(void);
 void sigbus_reset(void);
 
diff --git a/src/shared/sleep-config.h b/src/shared/sleep-config.h
index 51d2dec7b4..5eda18ee38 100644
--- a/src/shared/sleep-config.h
+++ b/src/shared/sleep-config.h
@@ -19,6 +19,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 int parse_sleep_config(const char *verb, char ***modes, char ***states);
 
 int can_sleep(const char *verb);
diff --git a/src/udev/mtd_probe/mtd_probe.h b/src/udev/mtd_probe/mtd_probe.h
index 2a37ede578..d99be9addc 100644
--- a/src/udev/mtd_probe/mtd_probe.h
+++ b/src/udev/mtd_probe/mtd_probe.h
@@ -17,6 +17,8 @@
  * Boston, MA  02110-1301  USA
  */
 
+#pragma once
+
 #include <mtd/mtd-user.h>
 
 /* Full oob structure as written on the flash */
diff --git a/src/udev/scsi_id/scsi.h b/src/udev/scsi_id/scsi.h
index c423cac574..3f99ae7724 100644
--- a/src/udev/scsi_id/scsi.h
+++ b/src/udev/scsi_id/scsi.h
@@ -10,6 +10,8 @@
  *        Free Software Foundation version 2 of the License.
  */
 
+#pragma once
+
 #include <scsi/scsi.h>
 
 struct scsi_ioctl_command {
diff --git a/src/udev/scsi_id/scsi_id.h b/src/udev/scsi_id/scsi_id.h
index 648b5ce42a..141b116a88 100644
--- a/src/udev/scsi_id/scsi_id.h
+++ b/src/udev/scsi_id/scsi_id.h
@@ -15,6 +15,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #define MAX_PATH_LEN 512
 
 /*
diff --git a/src/udev/udevadm-util.h b/src/udev/udevadm-util.h
index dba651fddb..37e4fe8369 100644
--- a/src/udev/udevadm-util.h
+++ b/src/udev/udevadm-util.h
@@ -15,6 +15,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include "udev.h"
 
 struct udev_device *find_device(struct udev *udev,