From 939b694bfda27017c34a8cdccc81f2bb2ef44079 Mon Sep 17 00:00:00 2001
From: George Sobala <gsobala@gmail.com>
Date: Mon, 13 Dec 2021 15:29:31 +0000
Subject: [PATCH] Fix for profile-build failure using gcc on MacOS

Fixes https://github.com/official-stockfish/Stockfish/issues/3846 ,
where the profiling SF binary generated by GCC on MacOS would launch
but failed to quit. Tested with gcc-8, gcc9, gcc10, gcc-11.

The problem can be fixed by adding -fvisibility=hidden to the compiler
flags, see for example the following piece of Apple documentation:
https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html

For instance this now works:
   make -j8 profile-build ARCH=x86-64-avx2 COMP=gcc COMPCXX=g++-11

No functional change
---
 src/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Makefile b/src/Makefile
index 3cf97873..5e263772 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -459,6 +459,9 @@ else ifeq ($(comp),clang)
 else
 	profile_make = gcc-profile-make
 	profile_use = gcc-profile-use
+	ifeq ($(KERNEL),Darwin)
+		EXTRAPROFILEFLAGS = -fvisibility=hidden
+	endif
 endif
 
 ### Travis CI script uses COMPILER to overwrite CXX
@@ -920,12 +923,14 @@ gcc-profile-make:
 	@mkdir -p profdir
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
 	EXTRACXXFLAGS='-fprofile-generate=profdir' \
+	EXTRACXXFLAGS+=$(EXTRAPROFILEFLAGS) \
 	EXTRALDFLAGS='-lgcov' \
 	all
 
 gcc-profile-use:
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
 	EXTRACXXFLAGS='-fprofile-use=profdir -fno-peel-loops -fno-tracer' \
+	EXTRACXXFLAGS+=$(EXTRAPROFILEFLAGS) \
 	EXTRALDFLAGS='-lgcov' \
 	all