package/util-linux: fix build with -O0

Fix the following build failure with -O0 raised since bump to version
2.39 in commit ad276d94a392fb13244e042851a44269e6254d61 and
https://github.com/util-linux/util-linux/commit/2fa4168c8bc9d5438bc1dfadda293c7c21b6fa59:

libuuid/src/gen_uuid.c: In function 'uuid_generate_time_generic':
libuuid/src/gen_uuid.c:536:33: error: initializer element is not constant
  THREAD_LOCAL int  cache_size = cs_min;
                                 ^~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/7c9b8508345ffaba167c08521fb865d76555be1d
 - http://autobuild.buildroot.org/results/2f80a5cdb523cc3c8c0f3693607a1be036b2ae98

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/util-linux/0001-libuuid-src-gen_uuid.c-fix-cs_min-declaration.patch

@@ -0,0 +1,80 @@
+From bcd11dece7d278bb0b76b138d08dedea80fa8262 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Tue, 7 Nov 2023 18:43:57 +0100
+Subject: [PATCH] libuuid/src/gen_uuid.c: fix cs_min declaration
+
+Define cs_min through a define and not a const int to avoid the
+following build failure with -O0 raised since version 2.39 and
+https://github.com/util-linux/util-linux/commit/2fa4168c8bc9d5438bc1dfadda293c7c21b6fa59:
+
+libuuid/src/gen_uuid.c: In function 'uuid_generate_time_generic':
+libuuid/src/gen_uuid.c:536:33: error: initializer element is not constant
+  THREAD_LOCAL int  cache_size = cs_min;
+                                 ^~~~~~
+
+For consistency, also use define for cs_max and cs_factor
+
+Fixes:
+ - http://autobuild.buildroot.org/results/2f80a5cdb523cc3c8c0f3693607a1be036b2ae98
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Upstream: https://github.com/util-linux/util-linux/commit/07e5c29d501c19e7af84fecb5915e0f9f94cb49f
+---
+ libuuid/src/gen_uuid.c | 19 ++++++++++---------
+ 1 file changed, 10 insertions(+), 9 deletions(-)
+
+diff --git a/libuuid/src/gen_uuid.c b/libuuid/src/gen_uuid.c
+index 619ef0131..db793c374 100644
+--- a/libuuid/src/gen_uuid.c
++++ b/libuuid/src/gen_uuid.c
+@@ -518,6 +518,10 @@ int __uuid_generate_time_cont(uuid_t out, int *num, uint32_t cont_offset)
+ 	return __uuid_generate_time_internal(out, num, cont_offset);
+ }
+ 
++#define CS_MIN		(1<<6)
++#define CS_MAX		(1<<18)
++#define CS_FACTOR	2
++
+ /*
+  * Generate time-based UUID and store it to @out
+  *
+@@ -529,11 +533,8 @@ int __uuid_generate_time_cont(uuid_t out, int *num, uint32_t cont_offset)
+ static int uuid_generate_time_generic(uuid_t out) {
+ #ifdef HAVE_TLS
+ 	/* thread local cache for uuidd based requests */
+-	const int			cs_min = (1<<6);
+-	const int			cs_max = (1<<18);
+-	const int			cs_factor = 2;
+ 	THREAD_LOCAL int		num = 0;
+-	THREAD_LOCAL int		cache_size = cs_min;
++	THREAD_LOCAL int		cache_size = CS_MIN;
+ 	THREAD_LOCAL int		last_used = 0;
+ 	THREAD_LOCAL struct uuid	uu;
+ 	THREAD_LOCAL time_t		last_time = 0;
+@@ -552,10 +553,10 @@ static int uuid_generate_time_generic(uuid_t out) {
+ 		 * Start with a small cache size to cover short running applications
+ 		 * and adjust the cache size over the runntime.
+ 		 */
+-		if ((last_used == cache_size) && (cache_size < cs_max))
+-			cache_size *= cs_factor;
+-		else if ((last_used < (cache_size / cs_factor)) && (cache_size > cs_min))
+-			cache_size /= cs_factor;
++		if ((last_used == cache_size) && (cache_size < CS_MAX))
++			cache_size *= CS_FACTOR;
++		else if ((last_used < (cache_size / CS_FACTOR)) && (cache_size > CS_MIN))
++			cache_size /= CS_FACTOR;
+ 
+ 		num = cache_size;
+ 
+@@ -568,7 +569,7 @@ static int uuid_generate_time_generic(uuid_t out) {
+ 		}
+ 		/* request to daemon failed, reset cache */
+ 		num = 0;
+-		cache_size = cs_min;
++		cache_size = CS_MIN;
+ 	}
+ 	if (num > 0) { /* serve uuid from cache */
+ 		uu.time_low++;
+-- 
+2.43.0
+