games-board/stockfish: EAPI 8, fix build w/ gcc-15

New revision in part because the previous code was wrong and it
wasn't guaranteed to work correctly.

Closes: https://bugs.gentoo.org/940504
Signed-off-by: Sam James <sam@gentoo.org>

games-board/stockfish/files/stockfish-17-gcc15.patch

@@ -0,0 +1,40 @@
+https://bugs.gentoo.org/940504
+https://github.com/official-stockfish/Stockfish/issues/5714
+https://github.com/official-stockfish/Stockfish/commit/1776448917e49b922a762d2d08c00a3f3be10205
+
+From 1776448917e49b922a762d2d08c00a3f3be10205 Mon Sep 17 00:00:00 2001
+From: Disservin <disservin.social@gmail.com>
+Date: Fri, 13 Dec 2024 17:00:05 +0100
+Subject: [PATCH] Move Embedded Net Data out of Anon Namespace
+
+fixes https://github.com/official-stockfish/Stockfish/issues/5714
+
+closes https://github.com/official-stockfish/Stockfish/pull/5715
+
+No functional change
+---
+ src/nnue/network.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/nnue/network.cpp b/src/nnue/network.cpp
+index 0a4452f6604..01cf2516d4a 100644
+--- a/nnue/network.cpp
++++ b/nnue/network.cpp
+@@ -38,7 +38,6 @@
+ #include "nnue_common.h"
+ #include "nnue_misc.h"
+ 
+-namespace {
+ // Macro to embed the default efficiently updatable neural network (NNUE) file
+ // data in the engine binary (using incbin.h, by Dale Weiler).
+ // This macro invocation will declare the following three variables
+@@ -58,6 +57,8 @@ const unsigned char* const gEmbeddedNNUESmallEnd     = &gEmbeddedNNUESmallData[1
+ const unsigned int         gEmbeddedNNUESmallSize    = 1;
+ #endif
+ 
++namespace {
++
+ struct EmbeddedNNUE {
+     EmbeddedNNUE(const unsigned char* embeddedData,
+                  const unsigned char* embeddedEnd,
+

games-board/stockfish/stockfish-17-r1.ebuild

@@ -0,0 +1,99 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs
+
+NNUE_FILES="nn-1111cefa1111.nnue nn-37f18f62d772.nnue"
+DESCRIPTION="Free UCI chess engine, claimed to be the strongest in the world"
+HOMEPAGE="https://stockfishchess.org/"
+SRC_URI="https://github.com/official-stockfish/Stockfish/archive/sf_${PV}.tar.gz -> ${P}.tar.gz"
+for i in ${NNUE_FILES}; do
+	SRC_URI+=" https://tests.stockfishchess.org/api/nn/${i} -> ${P}-${i}"
+done
+S="${WORKDIR}/Stockfish-sf_${PV}/src"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~arm64 ~loong ~riscv ~x86"
+IUSE="cpu_flags_arm_v7 cpu_flags_x86_avx2 cpu_flags_x86_popcnt cpu_flags_x86_sse cpu_flags_x86_avx512f"
+IUSE+=" cpu_flags_x86_avx512dq debug general-32 general-64 +optimize"
+
+BDEPEND="|| ( app-arch/unzip app-arch/zip )"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-gcc15.patch
+)
+
+pkg_setup() {
+	if ! tc-is-clang && ! tc-is-gcc; then
+		die "Unsupported compiler: $(tc-getCC)"
+	fi
+}
+
+src_prepare() {
+	default
+
+	# remove config sanity check that doesn't like our COMPILER settings
+	sed -i -e 's/ config-sanity//g' Makefile || die
+
+	for i in $NNUE_FILES; do
+		cp "${DISTDIR}"/${P}-${i} ${i} || die "copying the nnue file failed"
+	done
+
+	# prevent pre-stripping
+	sed -e 's:-strip $(BINDIR)/$(EXE)::' -i Makefile \
+		|| die 'failed to disable stripping in the Makefile'
+
+	# Makefile is a bit optimistic
+	sed -e 's:-flto=full:-flto:g' -i Makefile || die
+}
+
+src_compile() {
+	local my_arch
+
+	# generic unoptimized first
+	use general-32 && my_arch=general-32
+	use general-64 && my_arch=general-64
+
+	# x86
+	use x86 && my_arch=x86-32-old
+	use cpu_flags_x86_sse && my_arch=x86-32
+
+	# amd64
+	use amd64 && my_arch=x86-64
+	use cpu_flags_x86_popcnt && my_arch=x86-64-modern
+
+	# both bmi2 and avx2 are part of hni (haswell new instructions)
+	use cpu_flags_x86_avx2 && my_arch=x86-64-bmi2
+
+	# avx512
+	# we currently can't express  'avx512vnni' 'avx512dq' 'avx512f' 'avx512bw' 'avx512vl'
+	# so only enable basic support
+	use cpu_flags_x86_avx512f && use cpu_flags_x86_avx512dq && my_arch=x86-64-avx512
+
+	# other architectures
+	use cpu_flags_arm_v7 && my_arch=armv7
+	use ppc && my_arch=ppc
+	use ppc64 && my_arch=ppc64
+
+	# Bug 919781: COMP is a fixed string like clang/gcc to set tools for PGO
+	local comp
+	tc-is-gcc && comp="gcc"
+	tc-is-clang && comp="clang"
+
+	# There's a nice hack in the Makefile that overrides the value of CXX with
+	# COMPILER to support Travis CI and we abuse it to make sure that we
+	# build with our compiler of choice.
+	emake profile-build ARCH="${my_arch}" \
+		COMP="${comp}" \
+		COMPILER="$(tc-getCXX)" \
+		debug=$(usex debug "yes" "no") \
+		optimize=$(usex optimize "yes" "no")
+}
+
+src_install() {
+	dobin "${PN}"
+	dodoc ../AUTHORS ../README.md
+}