File mbedtls-fix-building-with-GCC-16.patch of Package canokey-qemu

From 1694b87736a74a5fbbbc93599bc359ed9b890073 Mon Sep 17 00:00:00 2001
From: Dario Faggioli <dfaggioli@suse.com>
Date: Fri, 23 Jan 2026 11:59:01 +0100
Subject: [PATCH] mbedtls: fix building with GCC 16
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GCC 16 is strictier about variables set but not actually used. In fact,
the build (in OBS) with it fails like this:

  13s] [...]/mbedtls/library/bignum.c:1650:29: error: variable ‘t’ set but not used [-Werror=unused-but-set-variable=]
[   13s]  1650 |     mbedtls_mpi_uint c = 0, t = 0;
[   13s]       |                             ^
[   13s] cc1: all warnings being treated as errors

However, the variable is used in some of the macros. Let's add a "fake"
read of it, for silencing the warning.

References: bsc#1256957
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 library/bignum.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/canokey-core/canokey-crypto/mbedtls/library/bignum.c b/canokey-core/canokey-crypto/mbedtls/library/bignum.c
index 20afa22d5d..2548576f0b 100644
--- a/canokey-core/canokey-crypto/mbedtls/library/bignum.c
+++ b/canokey-core/canokey-crypto/mbedtls/library/bignum.c
@@ -1699,6 +1699,8 @@ void mpi_mul_hlp( size_t i,
 #endif /* MULADDC_HUIT */
 
     t++;
+    // FIX: Silence GCC16 "set but unused" warning 
+    (void) t;
 
     while( c != 0 )
     {
-- 
2.52.0