From c3f77a2ea5f6890620dc7935cbc8e5b63a5b14c6 Mon Sep 17 00:00:00 2001
From: Andrey Akhmichin <15944199+nekonomicon@users.noreply.github.com>
Date: Sat, 4 Jun 2022 22:23:41 +0500
Subject: [PATCH] cmake: disable 64BIT flag by default only for 32-bit archs
 and 64-bit windows and linux

---
 CMakeLists.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c6e0987..e07c471c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,17 @@ option(USE_VOICEMGR "Enable VOICE MANAGER." OFF)
 option(BUILD_CLIENT "Build client dll" ON)
 option(BUILD_SERVER "Build server dll" ON)
 option(GOLDSOURCE_SUPPORT "Build goldsource compatible client library" OFF)
-option(64BIT "Disable auto -m32 appending to compiler flags" OFF)
+
+if (CMAKE_SIZEOF_VOID_P EQUAL 4 OR
+	(WIN32 OR ${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+	AND (CMAKE_SYSTEM_PROCESSOR STREQUAL "x64"
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64"
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64"))
+	option(64BIT "Disable auto -m32 appending to compiler flags" OFF)
+else()
+	option(64BIT "Disable auto -m32 appending to compiler flags" ON)
+endif()
+
 set(GAMEDIR "valve" CACHE STRING "Gamedir path")
 set(SERVER_INSTALL_DIR "dlls" CACHE STRING "Where put server dll")
 set(CLIENT_INSTALL_DIR "cl_dlls" CACHE STRING "Where put client dll")