From ce50187ee71803da24b922760f7b06c4045a6259 Mon Sep 17 00:00:00 2001
From: newEntera <mencien@icloud.com>
Date: Wed, 26 Jul 2017 08:51:31 +0300
Subject: [PATCH] backward compatibility to cmake 3.0

you should either use my backward compatibility which is dirty or take into account my experience and change to minimum required cmake 3.1
---
 CMakeLists.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c73aef0ba5..47ea656eca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,24 @@
 ############################################################################
 
 cmake_minimum_required(VERSION 3.0)
+# minimum required 3.0 is a bit contradiction to my experience. it should be 3.1 
+# because CMake 3.1 introduced the CMAKE_CXX_STANDARD. Cmake 3.1 compiles fine,
+# but CMake 3.0 does not have the CMAKE_CXX_STANDARD and then it does not use cxx11
+# then you hit error: 
+# expected template-name before ‘<’ token error enabled_shared_from_this
+# dirty patch
+macro(use_cxx11)
+  if (CMAKE_VERSION VERSION_LESS "3.1")
+    if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+      set (CMAKE_CXX_FLAGS "--std=gnu++11 ${CMAKE_CXX_FLAGS}")
+    endif ()
+  else ()
+    set (CMAKE_CXX_STANDARD 11)
+  endif ()
+endmacro(use_cxx11)
+use_cxx11()
+#end of dirty patch
+
 project(linphone VERSION 3.12.0 LANGUAGES C CXX)