Merge pull request #496 from albestro/update_cmake_ci

Update CMake in CI

.travis.yml

@@ -106,6 +106,23 @@ matrix:
       # packages:
         # - clang-5.0
 
+before_script:
+  - mkdir -p /tmp/cmake.root
+  - |
+    if [ $TRAVIS_OS_NAME = 'linux' ]; then
+      CMAKE_PKG_SUFFIX="linux-x86_64"
+    else
+      CMAKE_PKG_SUFFIX="macos10.10-universal"
+    fi
+  - wget -qO- "https://cmake.org/files/v3.20/cmake-3.20.5-$CMAKE_PKG_SUFFIX.tar.gz" | tar --strip-components=1 -xz -C /tmp/cmake.root
+  - |
+    if [ $TRAVIS_OS_NAME = 'linux' ]; then
+      CMAKE_BIN_DIR="bin"
+    else
+      CMAKE_BIN_DIR="CMake.app/Contents/bin"
+    fi
+  - export PATH=/tmp/cmake.root/$CMAKE_BIN_DIR:$PATH
+
 # Build and check this project
 script:
   - eval "${MATRIX_EVAL}"

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0.0)
+cmake_minimum_required(VERSION 3.11)
 
 list (APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")