From 9d2227cf5c70f942e068457df546f53f1d44cc4c Mon Sep 17 00:00:00 2001
From: Tim Angus <tim@ngus.net>
Date: Fri, 22 Aug 2025 18:46:21 +0100
Subject: [PATCH] Add -fvisibility=hidden to GCC/Clang compiler flags

---
 cmake/compilers/gnu.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmake/compilers/gnu.cmake b/cmake/compilers/gnu.cmake
index 22238f44..a6c9f934 100644
--- a/cmake/compilers/gnu.cmake
+++ b/cmake/compilers/gnu.cmake
@@ -24,6 +24,10 @@ add_compile_options(-Wno-format-zero-length -Wno-format-nonliteral)
 # that rely on the compiler not optimising them away, so disable it
 add_compile_options(-fno-strict-aliasing)
 
+# This is necessary to hide all symbols unless explicitly exported
+# via the Q_EXPORT macro
+add_compile_options(-fvisibility=hidden)
+
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
     set(CMAKE_INSTALL_PREFIX /opt/quake3)
 endif()