Lower minimum CMake version to 3.16

.github/workflows/checks.yml

@@ -29,7 +29,15 @@ jobs:
 
     - name: Run sccache-cache
       uses: mozilla-actions/[email protected]
-
+
+    - name: Get CMake
+      uses: lukka/get-cmake@latest
+      with:
+        cmakeVersion: '3.16.3'
+
+    - name: Print CMake version
+      run: cmake --version
+
     - name: configure
       run: cmake --preset ci-release-checks -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ .
 
@@ -63,7 +71,15 @@ jobs:
 
     - name: Run sccache-cache
       uses: mozilla-actions/[email protected]
-
+
+    - name: Get CMake
+      uses: lukka/get-cmake@latest
+      with:
+        cmakeVersion: '3.16.3'
+
+    - name: Print CMake version
+      run: cmake --version
+
     - name: configure
       run: cmake --preset ci-release-checks
 
@@ -99,6 +115,17 @@ jobs:
     - name: Run sccache-cache
       uses: mozilla-actions/[email protected]
 
+    - name: Run sccache-cache
+      uses: mozilla-actions/[email protected]
+
+    - name: Get CMake
+      uses: lukka/get-cmake@latest
+      with:
+        cmakeVersion: '3.16.3'
+
+    - name: Print CMake version
+      run: cmake --version
+
     - name: configure
       run: |
         export PATH=/usr/local/opt/qt5/bin:$PATH
@@ -160,7 +187,7 @@ jobs:
         run: |
           export SCCACHE_UNIX_PATH=$(cygpath -u "$SCCACHE_PATH")
           echo "SCCACHE_UNIX_PATH=$SCCACHE_UNIX_PATH" >> $GITHUB_ENV
-          
+      
       - name: configure
         run: cmake --preset ci-release-checks -DCMAKE_CXX_COMPILER_LAUNCHER=${{env.SCCACHE_UNIX_PATH}} .
 

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.21 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
 
 project(mrtrix3 VERSION 3.0.4)
 include(GNUInstallDirs)
@@ -14,7 +14,6 @@ option(MRTRIX_STL_DEBUGGING "Enable STL debug mode" OFF)
 option(MRTRIX_BUILD_TESTS "Build tests executables" OFF)
 
 if(MRTRIX_BUILD_TESTS)
-    list(APPEND CMAKE_CTEST_ARGUMENTS "--output-on-failure")
     enable_testing()
 endif()
 
@@ -28,6 +27,14 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+if(CMAKE_VERSION VERSION_LESS 3.21)
+  get_property(not_top DIRECTORY PROPERTY PARENT_DIRECTORY)
+  if(NOT not_top)
+    set(PROJECT_IS_TOP_LEVEL true)
+  endif()
+endif()
+
 if(APPLE)
     set(base @loader_path)
 else()