From a42d328f21f76e1637135db36eb8e8bca72849e4 Mon Sep 17 00:00:00 2001
From: Linmiao Xu <linmiao.xu@gmail.com>
Date: Thu, 9 Apr 2026 21:42:09 +0200
Subject: [PATCH] Fix compilation errors on macOS

```
clang++: error: unknown argument: '-fno-ipa-cp-clone'
clang++: error: unknown argument: '-fno-ipa-cp-clone'
make[1]: *** [bitboard.o] Error 1
```

The flag is unsupported by Clang, which pretends to be GCC on macOS, so
only passing -fno-ipa-cp-clone to real GCC fixes macOS builds.

closes https://github.com/official-stockfish/Stockfish/pull/6698

No functional change
---
 src/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index 48847bc78..c46505d88 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -451,7 +451,7 @@ endif
 ifeq ($(COMP),gcc)
 	comp=gcc
 	CXX=g++
-	CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-declarations -fno-ipa-cp-clone
+	CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-declarations
 
 	ifeq ($(arch),$(filter $(arch),armv7 armv8 riscv64))
 		ifeq ($(OS),Android)
@@ -623,7 +623,7 @@ ifeq ($(COMP),gcc)
 		profile_make = clang-profile-make
 		profile_use = clang-profile-use
 	else
-		CXXFLAGS += -Wstack-usage=128000
+		CXXFLAGS += -Wstack-usage=128000 -fno-ipa-cp-clone
 	endif
 endif