Merge #6305

6305: Adapting build system for CMake V3.27 r=hkaiser a=hkaiser

CMake starting with V3.27 complains about all-CAPS `<LIBRARY>_ROOT` variable names.

Co-authored-by: Hartmut Kaiser <hartmut.kaiser@gmail.com>

.jenkins/cscs/Jenkinsfile

@@ -42,7 +42,7 @@ pipeline {
                     // number of node-hours consumed
                     axis {
                         name 'configuration_name'
-                        values 'gcc-11', 'gcc-cuda', 'clang-10', 'clang-13', 'clang-cuda', 'clang-apex'
+                        values 'gcc-11', 'clang-10', 'clang-13', 'clang-apex'
                     }
                     axis {
                          name 'build_type'

CMakeLists.txt

@@ -1265,7 +1265,7 @@ hpx_option(
 )
 if(HPX_WITH_EXAMPLES_TBB)
   find_package(TBB)
-  if(NOT TBB_FOUND)
+  if(NOT Tbb_FOUND)
     set(HPX_WITH_EXAMPLES_TBB OFF)
   endif()
 endif()
@@ -1277,7 +1277,7 @@ hpx_option(
 )
 if(HPX_WITH_EXAMPLES_QTHREADS)
   find_package(QThreads)
-  if(NOT QTHREADS_FOUND)
+  if(NOT Qthreads_FOUND)
     set(HPX_WITH_EXAMPLES_QTHREADS OFF)
   endif()
 endif()
@@ -1290,7 +1290,7 @@ hpx_option(
 )
 if(HPX_WITH_EXAMPLES_HDF5)
   find_package(HDF5 COMPONENTS CXX)
-  if(NOT HDF5_FOUND)
+  if(NOT Hdf5_FOUND)
     set(HPX_WITH_EXAMPLES_HDF5 OFF)
   endif()
 endif()
@@ -1305,7 +1305,7 @@ if(NOT "${HPX_PLATFORM_UC}" STREQUAL "BLUEGENEQ")
   )
   if(HPX_WITH_EXAMPLES_QT4)
     find_package(Qt4)
-    if(NOT QT4_FOUND)
+    if(NOT Qt4_FOUND)
       set(HPX_WITH_EXAMPLES_QT4 OFF)
     endif()
   endif()
@@ -2310,12 +2310,23 @@ add_subdirectory(components)
 # ##############################################################################
 # Tests
 # ##############################################################################
-find_package(PythonInterp)
+if(POLICY CMP0148)
+  find_package(Python COMPONENTS Interpreter)
+  if(NOT Python_FOUND)
+    hpx_warn(
+      "A python interpreter could not be found. The test suite can not be run automatically."
+    )
+  endif()
 
-if(NOT PYTHONINTERP_FOUND)
-  hpx_warn(
-    "A python interpreter could not be found. The test suite can not be run automatically."
-  )
+else()
+  find_package(PythonInterp)
+  if(NOT PYTHONINTERP_FOUND)
+    hpx_warn(
+      "A python interpreter could not be found. The test suite can not be run automatically."
+    )
+  else()
+    set(Python_EXECUTABLE ${PYTHON_EXECUTABLE})
+  endif()
 endif()
 
 if(HPX_WITH_TESTS)
@@ -2341,7 +2352,7 @@ if(HPX_WITH_TOOLS OR HPX_WITH_TESTS_BENCHMARKS)
 endif()
 
 # Configure hpxrun.py
-if(PYTHONINTERP_FOUND)
+if(PYTHONINTERP_FOUND OR Python_FOUND)
   configure_file(
     "${PROJECT_SOURCE_DIR}/cmake/templates/hpxrun.py.in"
     "${PROJECT_BINARY_DIR}/bin/hpxrun.py" @ONLY
@@ -2466,7 +2477,7 @@ endif()
 # ##############################################################################
 # installation instructions
 # ##############################################################################
-if(PYTHONINTERP_FOUND)
+if(PYTHONINTERP_FOUND OR Python_FOUND)
   install(
     FILES "${PROJECT_BINARY_DIR}/bin/hpxrun.py"
     DESTINATION ${CMAKE_INSTALL_BINDIR}

cmake/FindAmplifier.cmake

@@ -1,64 +1,73 @@
 # Copyright (c) 2014 Thomas Heller
-# Copyright (c) 2012 Hartmut Kaiser
+# Copyright (c) 2012-2023 Hartmut Kaiser
 #
 # 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 Amplifier::amplifier)
+  # compatibility with older CMake versions
+  if(AMPLIFIER_ROOT AND NOT Amplifier_ROOT)
+    set(Amplifier_ROOT
+        ${AMPLIFIER_ROOT}
+        CACHE PATH "Amplifier base directory"
+    )
+    unset(AMPLIFIER_ROOT CACHE)
+  endif()
+
   find_package(PkgConfig QUIET)
   pkg_check_modules(PC_AMPLIFIER QUIET amplifier)
 
   find_path(
-    AMPLIFIER_INCLUDE_DIR ittnotify.h
-    HINTS ${AMPLIFIER_ROOT} ENV AMPLIFIER_ROOT ${PC_AMPLIFIER_INCLUDEDIR}
-          ${PC_AMPLIFIER_INCLUDE_DIRS}
+    Amplifier_INCLUDE_DIR ittnotify.h
+    HINTS ${Amplifier_ROOT} ENV AMPLIFIER_ROOT ${PC_Amplifier_INCLUDEDIR}
+          ${PC_Amplifier_INCLUDE_DIRS}
     PATH_SUFFIXES include
   )
 
   find_library(
-    AMPLIFIER_LIBRARY
+    Amplifier_LIBRARY
     NAMES ittnotify libittnotify
-    HINTS ${AMPLIFIER_ROOT} ENV AMPLIFIER_ROOT ${PC_AMPLIFIER_LIBDIR}
-          ${PC_AMPLIFIER_LIBRARY_DIRS}
+    HINTS ${Amplifier_ROOT} ENV AMPLIFIER_ROOT ${PC_Amplifier_LIBDIR}
+          ${PC_Amplifier_LIBRARY_DIRS}
     PATH_SUFFIXES lib lib64
   )
 
-  # Set AMPLIFIER_ROOT in case the other hints are used
-  if(AMPLIFIER_ROOT)
+  # Set Amplifier_ROOT in case the other hints are used
+  if(Amplifier_ROOT)
     # The call to file is for compatibility for windows paths
-    file(TO_CMAKE_PATH ${AMPLIFIER_ROOT} AMPLIFIER_ROOT)
+    file(TO_CMAKE_PATH ${Amplifier_ROOT} Amplifier_ROOT)
   elseif("$ENV{AMPLIFIER_ROOT}")
-    file(TO_CMAKE_PATH $ENV{AMPLIFIER_ROOT} AMPLIFIER_ROOT)
+    file(TO_CMAKE_PATH $ENV{AMPLIFIER_ROOT} Amplifier_ROOT)
   else()
-    file(TO_CMAKE_PATH "${AMPLIFIER_INCLUDE_DIR}" AMPLIFIER_INCLUDE_DIR)
-    string(REPLACE "/include" "" AMPLIFIER_ROOT "${AMPLIFIER_INCLUDE_DIR}")
+    file(TO_CMAKE_PATH "${Amplifier_INCLUDE_DIR}" Amplifier_INCLUDE_DIR)
+    string(REPLACE "/include" "" Amplifier_ROOT "${Amplifier_INCLUDE_DIR}")
   endif()
 
-  set(AMPLIFIER_LIBRARIES ${AMPLIFIER_LIBRARY})
-  set(AMPLIFIER_INCLUDE_DIRS ${AMPLIFIER_INCLUDE_DIR})
+  set(Amplifier_LIBRARIES ${Amplifier_LIBRARY})
+  set(Amplifier_INCLUDE_DIRS ${Amplifier_INCLUDE_DIR})
 
   find_package_handle_standard_args(
-    Amplifier DEFAULT_MSG AMPLIFIER_LIBRARY AMPLIFIER_INCLUDE_DIR
+    Amplifier DEFAULT_MSG Amplifier_LIBRARY Amplifier_INCLUDE_DIR
   )
 
   get_property(
     _type
-    CACHE AMPLIFIER_ROOT
+    CACHE Amplifier_ROOT
     PROPERTY TYPE
   )
   if(_type)
-    set_property(CACHE AMPLIFIER_ROOT PROPERTY ADVANCED 1)
+    set_property(CACHE Amplifier_ROOT PROPERTY ADVANCED 1)
     if("x${_type}" STREQUAL "xUNINITIALIZED")
-      set_property(CACHE AMPLIFIER_ROOT PROPERTY TYPE PATH)
+      set_property(CACHE Amplifier_ROOT PROPERTY TYPE PATH)
     endif()
   endif()
 
-  mark_as_advanced(AMPLIFIER_ROOT AMPLIFIER_LIBRARY AMPLIFIER_INCLUDE_DIR)
+  mark_as_advanced(Amplifier_ROOT Amplifier_LIBRARY Amplifier_INCLUDE_DIR)
 
   add_library(Amplifier::amplifier INTERFACE IMPORTED)
   target_include_directories(
-    Amplifier::amplifier SYSTEM INTERFACE ${AMPLIFIER_INCLUDE_DIR}
+    Amplifier::amplifier SYSTEM INTERFACE ${Amplifier_INCLUDE_DIR}
   )
-  target_link_libraries(Amplifier::amplifier INTERFACE ${AMPLIFIER_LIBRARIES})
+  target_link_libraries(Amplifier::amplifier INTERFACE ${Amplifier_LIBRARIES})
 endif()