From f5186bf0e6c319e34c7033ea7f6c45f6381f9ffd Mon Sep 17 00:00:00 2001
From: medithe <medithe@gmx.at>
Date: Tue, 18 Aug 2020 17:19:40 +0200
Subject: [PATCH] CMakeLists.txt: Added fno-common flag to clang and gcc.

---
 CMakeLists.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 881b2b22..7c9aff52 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,7 +111,8 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
       -Wctor-dtor-privacy -Wdisabled-optimization
       -Winvalid-pch -Woverloaded-virtual
       -Wconversion -Wswitch-enum -Wundef
-      -Wno-ctor-dtor-privacy -Wno-format-nonliteral)
+      -Wno-ctor-dtor-privacy -Wno-format-nonliteral
+      -fno-common)
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
       set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wnoexcept
          -Wno-dangling-else -Wno-unused-local-typedefs)
@@ -130,7 +131,7 @@ endif ()
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -pedantic -Wconversion -Wundef
-      -Wdeprecated -Wweak-vtables)
+      -Wdeprecated -Wweak-vtables -fno-common)
   check_cxx_compiler_flag(-Wzero-as-null-pointer-constant HAS_NULLPTR_WARNING)
   if (HAS_NULLPTR_WARNING)
     set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS}