sys-apps/bubblewrap: fix build with Clang

Closes: https://bugs.gentoo.org/834912
Signed-off-by: Sam James <sam@gentoo.org>

sys-apps/bubblewrap/bubblewrap-0.6.1.ebuild

@@ -30,6 +30,10 @@ BDEPEND="
 # tests require root priviledge
 RESTRICT="test"
 
+PATCHES=(
+	"${FILESDIR}"/${P}-clang-printf.patch
+)
+
 pkg_setup() {
 	if [[ ${MERGE_TYPE} != buildonly ]]; then
 		CONFIG_CHECK="~UTS_NS ~IPC_NS ~USER_NS ~PID_NS ~NET_NS"

sys-apps/bubblewrap/files/bubblewrap-0.6.1-clang-printf.patch

@@ -0,0 +1,30 @@
+https://github.com/containers/bubblewrap/commit/08dc2bb54658e003724f570224541a674645d87f.patch
+https://bugs.gentoo.org/834912
+
+From 08dc2bb54658e003724f570224541a674645d87f Mon Sep 17 00:00:00 2001
+From: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
+Date: Fri, 18 Mar 2022 10:25:51 +0100
+Subject: [PATCH] tests: properly tag ok as being printf-like
+
+Avoids breaking warning with clang
+
+Fixes #478
+
+Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
+---
+ tests/test-utils.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/tests/test-utils.c b/tests/test-utils.c
+index c9b859d2..41874a15 100644
+--- a/tests/test-utils.c
++++ b/tests/test-utils.c
+@@ -25,6 +25,8 @@
+ 
+ /* A small implementation of TAP */
+ static unsigned int test_number = 0;
++
++__attribute__((format(printf, 1, 2)))
+ static void
+ ok (const char *format, ...)
+ {