Fix for NVIDIA 470.256.02 driver for GCC 15

nvidia-470xx-fix-gcc-15.patch

From 3d51f7abf1c591dfd47d0070e2b6942ef91301af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joan=20Bruguera=20Mic=C3=B3?= <[email protected]>
Date: Sun, 1 Jun 2025 22:14:13 +0000
Subject: [PATCH] Fix for NVIDIA 470.256.02 driver for GCC 15

conftest.sh invokes GCC on its own, without going through the usual
kernel Makefile that would add the proper CFLAGS (e.g. -std=gnu11).

This means that it builds with the default of GCC, which in GCC 15
has changed to -std=gnu23 which and has backwards incompatible changes
that the kernel does not support. Force it to -std=gnu17 instead.
---
 conftest.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/conftest.sh b/conftest.sh
index 70c91e5..dc40d3a 100755
--- a/conftest.sh
+++ b/conftest.sh
@@ -205,6 +205,9 @@ build_cflags() {
             CFLAGS="$CFLAGS -mfentry -DCC_USING_FENTRY"
         fi
     fi
+
+    # Specify the C standard, instead of defaulting to the compiler's
+    CFLAGS="$CFLAGS -std=gnu17"
 }
 
 CONFTEST_PREAMBLE="#include \"conftest/headers.h\"
-- 
2.49.0