From aa2697df2da823bd38cd79ace699c848ae510c28 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Thu, 24 Jun 2021 17:07:26 +0200
Subject: [PATCH] [NTOSKRNL] Enforce -fno-common on GCC & CLang builds

---
 ntoskrnl/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ntoskrnl/CMakeLists.txt b/ntoskrnl/CMakeLists.txt
index b3362814e56..0c91c1f7f40 100644
--- a/ntoskrnl/CMakeLists.txt
+++ b/ntoskrnl/CMakeLists.txt
@@ -3,6 +3,11 @@ PROJECT(NTOS)
 
 include(ntos.cmake)
 
+if (CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")
+    # Make sure we don't duplicate some symbols
+    add_compile_options(-fno-common)
+endif()
+
 set(NTOSKRNL_SOURCE ${SOURCE})
 set(NTOSKRNL_ASM_SOURCE ${ASM_SOURCE})