Cleaner ddc installation

CMakeLists.txt

@@ -63,14 +63,6 @@ elseif("${DDC_Kokkos_DEPENDENCY_POLICY}" STREQUAL "INSTALLED")
     ddc_check_required_kokkos_options()
 endif()
 
-## PDI
-
-if("${DDC_BUILD_PDI_WRAPPER}")
-    if(NOT TARGET PDI::PDI_C)
-        find_package(PDI 1.6...<2 REQUIRED COMPONENTS C)
-    endif()
-endif()
-
 ## GoogleTest
 
 if("${BUILD_TESTING}" AND "${DDC_BUILD_TESTS}")
@@ -131,11 +123,6 @@ endif()
 
 ## The library itself
 
-### DDC legacy target
-add_library(DDC INTERFACE)
-add_library(DDC::DDC ALIAS DDC)
-install(TARGETS DDC EXPORT DDCTargets)
-
 add_library(ddc_core INTERFACE)
 add_library(DDC::core ALIAS ddc_core)
 configure_file(cmake/config.hpp.in generated/ddc/config.hpp NO_SOURCE_PERMISSIONS @ONLY)
@@ -151,9 +138,6 @@ target_include_directories(
 )
 target_link_libraries(ddc_core INTERFACE Kokkos::kokkos)
 
-### DDC legacy target
-target_link_libraries(DDC INTERFACE DDC::core)
-
 # Link library to DDC
 
 if("${DDC_BUILD_KERNELS_FFT}")
@@ -183,11 +167,10 @@ if("${DDC_BUILD_KERNELS_FFT}")
 
     add_library(ddc_fft INTERFACE)
     add_library(DDC::fft ALIAS ddc_fft)
-    install(TARGETS ddc_fft EXPORT DDCTargets)
+    install(TARGETS ddc_fft EXPORT DDCFftTargets)
     target_link_libraries(ddc_fft INTERFACE DDC::core Kokkos::kokkos KokkosFFT::fft)
 
-    ### DDC legacy target
-    target_link_libraries(DDC INTERFACE DDC::fft)
+    install(EXPORT DDCFftTargets NAMESPACE DDC::impl:: DESTINATION ${DDC_INSTALL_CMAKEDIR})
 endif()
 
 if("${DDC_BUILD_KERNELS_SPLINES}")
@@ -223,23 +206,26 @@ if("${DDC_BUILD_KERNELS_SPLINES}")
     add_library(ddc_splines INTERFACE)
     add_library(DDC::splines ALIAS ddc_splines)
     install(FILES cmake/FindLAPACKE.cmake DESTINATION ${DDC_INSTALL_CMAKEDIR})
-    install(TARGETS ddc_splines EXPORT DDCTargets)
+    install(TARGETS ddc_splines EXPORT DDCSplinesTargets)
     target_include_directories(ddc_splines SYSTEM INTERFACE ${LAPACKE_INCLUDE_DIRS})
     target_link_libraries(
         ddc_splines
         INTERFACE DDC::core Ginkgo::ginkgo Kokkos::kokkos Kokkos::kokkoskernels ${LAPACKE_LIBRARIES}
     )
 
-    ### DDC legacy target
-    target_link_libraries(DDC INTERFACE DDC::splines)
+    install(EXPORT DDCSplinesTargets NAMESPACE DDC::impl:: DESTINATION ${DDC_INSTALL_CMAKEDIR})
 endif()
 
 ## The PDI wrapper
 
 if("${DDC_BUILD_PDI_WRAPPER}")
+    if(NOT TARGET PDI::PDI_C)
+        find_package(PDI 1.6...<2 REQUIRED COMPONENTS C)
+    endif()
+
     add_library(ddc_pdi INTERFACE)
     add_library(DDC::pdi ALIAS ddc_pdi)
-    install(TARGETS ddc_pdi EXPORT DDCTargets)
+    install(TARGETS ddc_pdi EXPORT DDCPdiTargets)
     target_compile_features(ddc_pdi INTERFACE cxx_std_17)
     target_include_directories(
         ddc_pdi
@@ -249,8 +235,7 @@ if("${DDC_BUILD_PDI_WRAPPER}")
     )
     target_link_libraries(ddc_pdi INTERFACE DDC::core PDI::PDI_C)
 
-    ### DDC legacy target
-    target_link_libraries(DDC INTERFACE DDC::pdi)
+    install(EXPORT DDCPdiTargets NAMESPACE DDC::impl:: DESTINATION ${DDC_INSTALL_CMAKEDIR})
 endif()
 
 ## if examples are enabled, build them
@@ -287,6 +272,8 @@ configure_package_config_file(
     cmake/DDCConfig.cmake.in
     ${CMAKE_CURRENT_BINARY_DIR}/DDCConfig.cmake
     INSTALL_DESTINATION ${DDC_INSTALL_CMAKEDIR}
+    NO_SET_AND_CHECK_MACRO
+    NO_CHECK_REQUIRED_COMPONENTS_MACRO
 )
 
 # We use SameMinorVersion until major version 1

cmake/DDCConfig.cmake.in

@@ -4,6 +4,26 @@
 
 @PACKAGE_INIT@
 
+# This macro extends the cmake macro `check_required_components`.
+# It checks if all required components for a package are found and
+# sets a custom NOT_FOUND_MESSAGE listing missing required components.
+macro(ddc_check_required_components _NAME)
+   set(REQUIRED_COMPONENTS_NOT_FOUND "")
+   foreach(comp ${${_NAME}_FIND_COMPONENTS})
+      if(NOT ${_NAME}_${comp}_FOUND)
+         if(${_NAME}_FIND_REQUIRED_${comp})
+            list(APPEND REQUIRED_COMPONENTS_NOT_FOUND "${comp}")
+            set(${_NAME}_FOUND FALSE)
+         endif()
+      endif()
+   endforeach()
+
+   if(REQUIRED_COMPONENTS_NOT_FOUND)
+      set(${_NAME}_NOT_FOUND_MESSAGE "Component(s) not found: ${REQUIRED_COMPONENTS_NOT_FOUND}")
+   endif()
+   unset(REQUIRED_COMPONENTS_NOT_FOUND)
+endmacro()
+
 # Workaround for rocm <6 setting a cmake_minimum_required <3.12.
 # When redefining `find_dependency` we get a better chance
 # to use the NEW policy for CMP0074.
@@ -16,11 +36,22 @@ set(DDC_BUILD_DOUBLE_PRECISION @DDC_BUILD_DOUBLE_PRECISION@)
 
 ddc_find_dependency(Kokkos 4.4...<5)
 
-if(@DDC_BUILD_KERNELS_FFT@)
+include(${CMAKE_CURRENT_LIST_DIR}/DDCTargets.cmake)
+if(NOT TARGET DDC::core)
+   add_library(DDC::core ALIAS DDC::impl::ddc_core)
+endif()
+
+if(@DDC_BUILD_KERNELS_FFT@ AND ("fft" IN_LIST DDC_FIND_COMPONENTS))
    ddc_find_dependency(KokkosFFT 0.2.1...<1)
+
+   include(${CMAKE_CURRENT_LIST_DIR}/DDCFftTargets.cmake)
+   if(NOT TARGET DDC::fft)
+      add_library(DDC::fft ALIAS DDC::impl::ddc_fft)
+   endif()
+   set(DDC_fft_FOUND TRUE)
 endif()
 
-if(@DDC_BUILD_KERNELS_SPLINES@)
+if(@DDC_BUILD_KERNELS_SPLINES@ AND ("splines" IN_LIST DDC_FIND_COMPONENTS))
    ddc_find_dependency(Ginkgo 1.8...<2)
    # DDC installs a FindLAPACKE.cmake file.
    # We choose to rely on it by prepending to CMAKE_MODULE_PATH
@@ -29,26 +60,22 @@ if(@DDC_BUILD_KERNELS_SPLINES@)
    ddc_find_dependency(LAPACKE)
    list(POP_FRONT CMAKE_MODULE_PATH)
    ddc_find_dependency(KokkosKernels 4.5.1...<5)
-endif()
 
-if(@DDC_BUILD_PDI_WRAPPER@)
-   ddc_find_dependency(PDI 1.6...<2 COMPONENTS C)
+   include(${CMAKE_CURRENT_LIST_DIR}/DDCSplinesTargets.cmake)
+   if(NOT TARGET DDC::splines)
+      add_library(DDC::splines ALIAS DDC::impl::ddc_splines)
+   endif()
+   set(DDC_splines_FOUND TRUE)
 endif()
 
-include(${CMAKE_CURRENT_LIST_DIR}/DDCTargets.cmake)
-
-# We always define public alias targets when impl targets are available.
-foreach(target core fft pdi splines)
-   if((NOT TARGET DDC::${target}) AND (TARGET DDC::impl::ddc_${target}))
-      add_library(DDC::${target} ALIAS DDC::impl::ddc_${target})
-   endif()
-endforeach()
+if(@DDC_BUILD_PDI_WRAPPER@ AND ("pdi" IN_LIST DDC_FIND_COMPONENTS))
+   ddc_find_dependency(PDI 1.6...<2 COMPONENTS C)
 
-# Components are found if the public targets exist
-foreach(component ${DDC_FIND_COMPONENTS})
-   if(TARGET DDC::${component})
-      set(DDC_${component}_FOUND TRUE)
+   include(${CMAKE_CURRENT_LIST_DIR}/DDCPdiTargets.cmake)
+   if(NOT TARGET DDC::pdi)
+      add_library(DDC::pdi ALIAS DDC::impl::ddc_pdi)
    endif()
-endforeach()
+   set(DDC_pdi_FOUND TRUE)
+endif()
 
-check_required_components(DDC)
+ddc_check_required_components(DDC)

install_test/CMakeLists.txt

@@ -10,11 +10,11 @@ find_package(DDC 0.4 REQUIRED)
 find_package(DDC 0.4 REQUIRED COMPONENTS fft)
 find_package(DDC 0.4 REQUIRED COMPONENTS pdi splines)
 
-message("DDC options:")
-message("DDC_BUILD_DOUBLE_PRECISION=${DDC_BUILD_DOUBLE_PRECISION}")
-message("DDC_fft_FOUND=${DDC_fft_FOUND}")
-message("DDC_pdi_FOUND=${DDC_pdi_FOUND}")
-message("DDC_splines_FOUND=${DDC_splines_FOUND}")
+message(STATUS "DDC options:")
+message(STATUS "* DDC_BUILD_DOUBLE_PRECISION=${DDC_BUILD_DOUBLE_PRECISION}")
+message(STATUS "* DDC_fft_FOUND=${DDC_fft_FOUND}")
+message(STATUS "* DDC_pdi_FOUND=${DDC_pdi_FOUND}")
+message(STATUS "* DDC_splines_FOUND=${DDC_splines_FOUND}")
 
 add_executable(main main.cpp)
 target_link_libraries(main PRIVATE DDC::core DDC::fft DDC::pdi DDC::splines)