From 234d2156fdf011a7bb850e3d6172ed2290ab3ad2 Mon Sep 17 00:00:00 2001
From: MinetaS <skdty87@gmail.com>
Date: Mon, 17 Oct 2022 00:03:08 +0900
Subject: [PATCH] Apply -flto-partition=one / -flto=full

This patch fixes a potential bug derived from an incompatibility between LTO and top-level assembly code (INCBIN).

Passed non-regression STC (master e90341f):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 119352 W: 31986 L: 31862 D: 55504
Ptnml(0-2): 439, 12624, 33400, 12800, 413
https://tests.stockfishchess.org/tests/view/634aacf84bc7650f0755188b

closes https://github.com/official-stockfish/Stockfish/pull/4201

No functional change
---
 AUTHORS      | 1 +
 src/Makefile | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index 804232f1..89e7c9ed 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -189,6 +189,7 @@ Stefan Geschwentner (locutus2)
 Stefano Cardanobile (Stefano80)
 Steinar Gunderson (sesse)
 Stéphane Nicolet (snicolet)
+Syine Mineta (MinetaS)
 Prokop Randáček (ProkopRandacek)
 Thanar2
 thaspel
diff --git a/src/Makefile b/src/Makefile
index 880710fe..1d5137d1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -678,7 +678,7 @@ endif
 ifeq ($(optimize),yes)
 ifeq ($(debug), no)
 	ifeq ($(comp),clang)
-		CXXFLAGS += -flto
+		CXXFLAGS += -flto=full
 		ifeq ($(target_windows),yes)
 			CXXFLAGS += -fuse-ld=lld
 		endif
@@ -688,10 +688,10 @@ ifeq ($(debug), no)
 # GCC on some systems.
 	else ifeq ($(comp),gcc)
 	ifeq ($(gccisclang),)
-		CXXFLAGS += -flto
+		CXXFLAGS += -flto -flto-partition=one
 		LDFLAGS += $(CXXFLAGS) -flto=jobserver
 	else
-		CXXFLAGS += -flto
+		CXXFLAGS += -flto=full
 		LDFLAGS += $(CXXFLAGS)
 	endif
 
-- 
2.39.2