https://bugs.gentoo.org/840137
https://gitlab.com/sane-project/backends/-/commit/6b99447f5b12758ff015b5c360a6dcbcf9b0a72d
https://gitlab.com/sane-project/backends/-/issues/597
https://gitlab.com/sane-project/backends/-/issues/557

From edfc90450ee06149537fadb3095ba4b215c5c4fa Mon Sep 17 00:00:00 2001
From: Ralph Little <skelband@gmail.com>
Date: Sun, 2 Oct 2022 18:14:25 -0700
Subject: [PATCH] genesys: corrections to include file order.

minigtest.h has items that require the definitions in tests_printers.h.
Pre-GCC-12, this didn't seem to matter but GCC12 seems to have a
problem with this and requires the template definitions to have already
appeared.
--- a/testsuite/backend/genesys/minigtest.cpp
+++ b/testsuite/backend/genesys/minigtest.cpp
@@ -18,10 +18,10 @@
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-#include "minigtest.h"
-
 #define DEBUG_DECLARE_ONLY
 
+#include "minigtest.h"
+
 size_t s_num_successes = 0;
 size_t s_num_failures = 0;
 
--- a/testsuite/backend/genesys/tests_image.cpp
+++ b/testsuite/backend/genesys/tests_image.cpp
@@ -21,8 +21,8 @@
 #define DEBUG_DECLARE_ONLY
 
 #include "tests.h"
-#include "minigtest.h"
 #include "tests_printers.h"
+#include "minigtest.h"
 
 #include "../../../backend/genesys/image.h"
 #include "../../../backend/genesys/image_pipeline.h"
--- a/testsuite/backend/genesys/tests_image_pipeline.cpp
+++ b/testsuite/backend/genesys/tests_image_pipeline.cpp
@@ -21,8 +21,8 @@
 #define DEBUG_DECLARE_ONLY
 
 #include "tests.h"
-#include "minigtest.h"
 #include "tests_printers.h"
+#include "minigtest.h"
 
 #include "../../../backend/genesys/image_pipeline.h"
 
--- a/testsuite/backend/genesys/tests_motor.cpp
+++ b/testsuite/backend/genesys/tests_motor.cpp
@@ -21,8 +21,8 @@
 #define DEBUG_DECLARE_ONLY
 
 #include "tests.h"
-#include "minigtest.h"
 #include "tests_printers.h"
+#include "minigtest.h"
 
 #include "../../../backend/genesys/low.h"
 #include "../../../backend/genesys/enums.h"
--- a/testsuite/backend/genesys/tests_utilities.cpp
+++ b/testsuite/backend/genesys/tests_utilities.cpp
@@ -21,8 +21,8 @@
 #define DEBUG_DECLARE_ONLY
 
 #include "tests.h"
-#include "minigtest.h"
 #include "tests_printers.h"
+#include "minigtest.h"
 
 #include "../../../backend/genesys/utilities.h"
 
GitLab