Merge branch 'feature/require-cmake-3.1' into 'master'

[cmake] Require CMake 3.1 similar to dune-common See merge request !166

Merge branch 'feature/require-cmake-3.1' into 'master'
aaaa1414 · Christoph Grüninger · 9d012149 · 5425b46e · aaaa1414
Commit aaaa1414 authored 7 years ago by Christoph Grüninger
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 project(dune-istl C CXX)

 # general stuff
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.1)

 # guess build tree of dune-common
 if(NOT (dune-common_DIR OR dune-common_ROOT OR