From 06ed0625bd856877f9799ed92ae48d97b5e2af11 Mon Sep 17 00:00:00 2001
From: =?utf8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
Date: Thu, 11 Dec 2025 22:02:55 +0000
Subject: [PATCH] tests: fix recent portability issue with printf

* tests/sort/sort-locale.sh: Avoid non portable printf \u....
* cfg.mk (sc_env_printf): Add a new syntax check to flag future cases.
---
 cfg.mk                    | 6 ++++++
 tests/sort/sort-locale.sh | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/cfg.mk b/cfg.mk
index e0d90cf831..393b6bbb11 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -642,6 +642,12 @@ sc_env_test_dependencies:
 		|| echo $$test should call: print_ver_ $$prog; \
 	    done | grep . && exit 1 || :
 
+# Enforce using our printf if using \u or \x
+sc_env_printf:
+	@cd $(top_srcdir) && GIT_PAGER= git grep 'printf.*[^\\]\\[ux]' tests \
+	  | grep -v -- '--printf' | grep -v 'env printf' \
+	  && { echo 'use "env printf" with \x or \u'; exit 1; } || :
+
 # Use framework_failure_, not the old name without the trailing underscore.
 sc_prohibit_framework_failure:
 	@prohibit='$(begword)framework_''failure$(endword)'		\
diff --git a/tests/sort/sort-locale.sh b/tests/sort/sort-locale.sh
index b1cdbb8e4b..5339bd8301 100755
--- a/tests/sort/sort-locale.sh
+++ b/tests/sort/sort-locale.sh
@@ -45,7 +45,7 @@ fi
 export LC_ALL=$LOCALE_FR_UTF8
 if test "$(locale charmap 2>/dev/null)" = UTF-8; then
   check_hard_collate 'aaé' 'aaf'  # é comes before f
-  check_hard_collate 'aéY' "$(printf 'ae\u0301Z')"  # NFC/NFD é are equal
+  check_hard_collate 'aéY' "$(printf 'ae\314\201Z')"  # NFC/NFD é are equal
 fi
 
 Exit $fail
-- 
2.47.3