Eliminate cmake warnings on more recent cmake versions.

Author: Kasper Peeters

client_server/CMakeLists.txt

@@ -1,6 +1,9 @@
-cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION})
+# cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION})
 project(Cadabra)
 
+if(POLICY CMP0167)
+  cmake_policy(SET CMP0167 NEW)
+endif()
 
 #---------------------------------------------------------------------------
 # Preamble.

core/CMakeLists.txt

@@ -1,6 +1,8 @@
-cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION}) # Required for various macros
+# cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION}) # Required for various macros
 project(Cadabra)
-
+if(POLICY CMP0167)
+  cmake_policy(SET CMP0167 NEW)
+endif()
 
 #---------------------------------------------------------------------------
 # Preamble.

frontend/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION})
+# cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION})
 project(Cadabra)
 
 

frontend/gtkmm/CMakeLists.txt

@@ -2,6 +2,10 @@ cmake_minimum_required(VERSION ${CADABRA_CMAKE_VERSION})
 project(CadabraGtkmm)
 include(FetchContent)
 
+if(POLICY CMP0167)
+  cmake_policy(SET CMP0167 NEW)
+endif()
+
 #---------------------------------------------------------------------------
 # Preamble.
 #---------------------------------------------------------------------------

libs/pybind11/CMakeLists.txt

@@ -208,6 +208,11 @@ else()
   set(PYBIND11_INSTALL OFF)
 endif()
 
+# KP: eventually this policy inheritance will all work, for now set set the policy by hand.
+if(POLICY CMP0148)
+  cmake_policy(SET CMP0148 NEW)
+endif()
+
 include("${CMAKE_CURRENT_SOURCE_DIR}/tools/pybind11Common.cmake")
 # https://github.com/jtojnar/cmake-snips/#concatenating-paths-when-building-pkg-config-files
 # TODO: cmake 3.20 adds the cmake_path() function, which obsoletes this snippet