その後テストを繰り返した結果、
カーネル 6.14.5 環境においては パッチ 0003, 0008 の２つを適用すれば十分なことが分かったので SlackBuildを修正した。

CatchyOS ptr1337氏が公開しているパッチを適用してカーネル 6.14.5 環境+GCC15で
NVIDIA-Linux-x86_64-575.51.02カーネルモジュールをコンパイルすることができたので
そのSlackBuild を記す。
パッチを作成・公開した ptr1337氏に感謝します。

add kernel-6.15 support #840 にある 575.51.02向けパッチ（↓）

カーネル 6.14.5 向けに必要なパッチは以下の2個
0003-Kbuild-Convert-EXTRA_CFLAGS-to-ccflags-y.patchh
0008-kbuild-Add-workaround-for-GCC-15-Compilation.patch
---
Base environment
OS : Slackware64-current 15.0+
Kernel: 6.14.5
GCC : 15.1.0 (testing packages)
NVIDIA driver version : 575.51.02

[Note] The following slackbuild was based on SBo's SlackBuild. 
            Thanks to "SLACKBUILDS dot org"

nvidia-kernel.SlackBuild [update : 2025/05/04]
[code]
#!/bin/bash

# Slackware build script for nvidia-kernel

# Copyright 2007-2011 Heinz Wiesinger, Amsterdam, The Netherlands
# Copyright 2012-2019 Edward W. Koenig, Vancouver, WA, USA
# Updates copyright 2020-2024 Lenard Spencer, Orlando, FL, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Thanks to Robby Workman for suggestions to improve this script.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=nvidia-kernel
VERSION=${VERSION:-575.51.02}
BUILD=${BUILD:-2}
TAG=${TAG:-jw}
PKGTYPE=${PKGTYPE:-txz}

KERNEL=${KERNEL:-$(uname -r)}
KERNELPATH=${KERNELPATH:-/lib/modules/${KERNEL}/build}

if [ "${OPEN:-yes}" = "yes" ]; then
  OPEN1="-open"
  OPEN2="_OPEN"
  DESC="OPEN"
else
  unset OPEN1
  unset OPEN2
  DESC="PROPRIETARY"
fi

set -e

PKGVER=${VERSION}${OPEN2}_$(echo $KERNEL | tr - _)

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ "$ARCH" = "x86_64" ]; then
  TARGET="x86_64"
else
  echo "$ARCH is not supported."
  exit 1
fi

unset ARCH

SRCNAM=NVIDIA-Linux-$TARGET-${VERSION}

if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$PKGVER-$TARGET-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP || exit 1
rm -rf $SRCNAM
sh $CWD/$SRCNAM.run --extract-only || exit 1
cd $SRCNAM || exit 1
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

#Apply CachyOS patches for linux-6.15 and GCC15
# patch URL: https://github.com/CachyOS/CachyOS-PKGBUILDS/tree/feat/nvidia-575/nvidia/nvidia-utils
cd kernel-open
patch -p2 < $CWD/patches/0003-Kbuild-Convert-EXTRA_CFLAGS-to-ccflags-y.patch
patch -p2 < $CWD/patches/0008-kbuild-Add-workaround-for-GCC-15-Compilation.patch
cd ..

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

( cd kernel$OPEN1  || exit 1

# CC=${CC:-gcc} suppresses an otherwise harmless "compiler mismatch"
# message.  If you custom-build your kernel with clang,
# then pass CC=clang to this script.
  CC=${CC:-gcc} make ${NUMJOBS} SYSSRC=$KERNELPATH module || exit 1
)

mkdir -p $PKG/lib/modules/$KERNEL/kernel/drivers/video
install -m 0664 kernel$OPEN1/nvidia.ko $PKG/lib/modules/$KERNEL/kernel/drivers/video/
install -m 0664 kernel$OPEN1/nvidia-modeset.ko $PKG/lib/modules/$KERNEL/kernel/drivers/video/
install -m 0664 kernel$OPEN1/nvidia-drm.ko $PKG/lib/modules/$KERNEL/kernel/drivers/video/
install -m 0664 kernel$OPEN1/nvidia-uvm.ko $PKG/lib/modules/$KERNEL/kernel/drivers/video/

mkdir -p $PKG/usr/share/X11/xorg.conf.d/
cat $TMP/$SRCNAM/nvidia-drm-outputclass.conf > $PKG/usr/share/X11/xorg.conf.d/10-nvidia.conf

mkdir -p $PKG/usr/doc/$PRGNAM-$PKGVER
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$PKGVER/$PRGNAM.SlackBuild
cat $CWD/patches/0003-Kbuild-Convert-EXTRA_CFLAGS-to-ccflags-y.patch > $PKG/usr/doc/$PRGNAM-$PKGVER/0003-Kbuild-Convert-EXTRA_CFLAGS-to-ccflags-y.patch
cat $CWD/patches/0008-kbuild-Add-workaround-for-GCC-15-Compilation.patch > $PKG/usr/doc/$PRGNAM-$PKGVER/0008-kbuild-Add-workaround-for-GCC-15-Compilation.patch

mkdir -p $PKG/install
sed "s%@DESC@%$DESC%" $CWD/slack-desc > $PKG/install/slack-desc
sed "s%@KERNEL@%$KERNEL%" $CWD/doinst.sh > $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$PKGVER-$TARGET-$BUILD$TAG.$PKGTYPE

doinst.sh
[code]
chroot . /sbin/depmod -a @KERNEL@ 2>/dev/null

slack-desc
[code]
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description.
# Line up the first '|' above the ':' following the base package name, and
# the '|' on the right side marks the last column you can put a character in.
# You must make exactly 11 lines for the formatting to be correct.  It's also
# customary to leave one space after the ':' except on otherwise blank lines.

             |-----handy-ruler------------------------------------------------------|
nvidia-kernel: nvidia-kernel (Kernel Interface for the nvidia driver)
nvidia-kernel:
nvidia-kernel: This is the @DESC@ version of the kernel module needed by the
nvidia-kernel: binary nvidia-driver.
nvidia-kernel:
nvidia-kernel:
nvidia-kernel:
nvidia-kernel:
nvidia-kernel:
nvidia-kernel:
nvidia-kernel:

nvidia-kernel.info
[code]
PRGNAM="nvidia-kernel"
VERSION="575.51.02"
HOMEPAGE="https://www.nvidia.com"
DOWNLOAD="UNSUPPORTED"
MD5SUM=""
DOWNLOAD_x86_64="https://download.nvidia.com/XFree86/Linux-x86_64/575.51.02/NVIDIA-Linux-x86_64-575.51.02.run"
MD5SUM_x86_64="4fde8f47d366411973b8d62c3860e486"
REQUIRES=""
MAINTAINER=""



===
[NEW] 2025/04/03
[update] 2025/05/04