Addressing cmake warnings issued starting V3.30

CMakeLists.txt

@@ -90,6 +90,7 @@ cmake_policy(VERSION 3.18)
 hpx_set_cmake_policy(CMP0042 NEW)
 hpx_set_cmake_policy(CMP0060 NEW)
 hpx_set_cmake_policy(CMP0074 NEW)
+hpx_set_cmake_policy(CMP0167 OLD)
 
 # We save the passed compiler flag to a special variable. This is needed for our
 # build system unit tests. Some flags might influence the created symbols

cmake/HPX_SetupAsio.cmake

@@ -32,10 +32,7 @@ elseif(NOT TARGET Asio::asio AND NOT HPX_FIND_PACKAGE)
     GIT_TAG ${HPX_WITH_ASIO_TAG}
   )
 
-  fetchcontent_getproperties(asio)
-  if(NOT asio_POPULATED)
-    fetchcontent_populate(asio)
-  endif()
+  fetchcontent_makeavailable(asio)
   set(Asio_ROOT ${asio_SOURCE_DIR})
 
   add_library(asio INTERFACE)

cmake/HPX_SetupBoost.cmake

@@ -1,5 +1,6 @@
 # Copyright (c) 2018 Christopher Hinz
 # Copyright (c) 2014 Thomas Heller
+# Copyright (c) 2007-2024 The STE||AR-Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -81,6 +82,13 @@ if(NOT TARGET hpx_dependencies_boost)
   # cmake-format: off
   set(Boost_ADDITIONAL_VERSIONS
       ${Boost_ADDITIONAL_VERSIONS}
+      "1.85.0" "1.85"
+      "1.84.0" "1.84"
+      "1.83.0" "1.83"
+      "1.82.0" "1.82"
+      "1.81.0" "1.81"
+      "1.80.0" "1.80"
+      "1.79.0" "1.79"
       "1.78.0" "1.78"
       "1.77.0" "1.77"
       "1.76.0" "1.76"
@@ -98,6 +106,8 @@ if(NOT TARGET hpx_dependencies_boost)
 
   set(Boost_NO_BOOST_CMAKE ON) # disable the search for boost-cmake
 
+  hpx_set_cmake_policy(CMP0167 OLD) # use CMake's FindBoost for now
+
   # Find the headers and get the version
   find_package(Boost ${Boost_MINIMUM_VERSION} REQUIRED)
   if(NOT Boost_VERSION_STRING)

cmake/HPX_SetupBoostFilesystem.cmake

@@ -1,4 +1,4 @@
-# Copyright (c) 2019-2023 The STE||AR-Group
+# Copyright (c) 2019-2024 The STE||AR-Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -7,6 +7,8 @@
 if(HPX_FILESYSTEM_WITH_BOOST_FILESYSTEM_COMPATIBILITY)
   # In case find_package(HPX) is called multiple times
   if(NOT TARGET Boost::filesystem)
+    hpx_set_cmake_policy(CMP0167 OLD) # use CMake's FindBoost for now
+
     find_package(
       Boost ${Boost_MINIMUM_VERSION} NO_POLICY_SCOPE MODULE
       COMPONENTS filesystem

cmake/HPX_SetupBoostIostreams.cmake

@@ -1,4 +1,4 @@
-# Copyright (c) 2019-2023 The STE||AR-Group
+# Copyright (c) 2019-2024 The STE||AR-Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -9,6 +9,8 @@ if((HPX_WITH_COMPRESSION_BZIP2
     OR HPX_WITH_COMPRESSION_ZLIB)
    AND NOT TARGET Boost::iostreams
 )
+  hpx_set_cmake_policy(CMP0167 OLD) # use CMake's FindBoost for now
+
   find_package(
     Boost ${Boost_MINIMUM_VERSION} NO_POLICY_SCOPE MODULE COMPONENTS iostreams
   )

cmake/HPX_SetupBoostRegex.cmake

@@ -1,10 +1,12 @@
-# Copyright (c) 2019-2023 The STE||AR-Group
+# Copyright (c) 2019-2024 The STE||AR-Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 if(NOT TARGET Boost::regex)
+  hpx_set_cmake_policy(CMP0167 OLD) # use CMake's FindBoost for now
+
   find_package(
     Boost ${Boost_MINIMUM_VERSION} NO_POLICY_SCOPE MODULE COMPONENTS regex
   )

cmake/HPX_SetupTarget.cmake

@@ -10,6 +10,8 @@ cmake_policy(PUSH)
 
 hpx_set_cmake_policy(CMP0054 NEW)
 hpx_set_cmake_policy(CMP0060 NEW)
+hpx_set_cmake_policy(CMP0074 NEW)
+hpx_set_cmake_policy(CMP0167 OLD)
 
 function(hpx_setup_target target)
   # retrieve arguments