Define optional targets as components

cmake/DDCConfig.cmake.in

@@ -7,9 +7,6 @@
 include(CMakeFindDependencyMacro)
 
 set(DDC_BUILD_DOUBLE_PRECISION @DDC_BUILD_DOUBLE_PRECISION@)
-set(DDC_BUILD_KERNELS_FFT @DDC_BUILD_KERNELS_FFT@)
-set(DDC_BUILD_KERNELS_SPLINES @DDC_BUILD_KERNELS_SPLINES@)
-set(DDC_BUILD_PDI_WRAPPER @DDC_BUILD_PDI_WRAPPER@)
 
 find_package(Kokkos 4.4...4.5)
 
@@ -34,9 +31,11 @@ endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/DDCTargets.cmake)
 
-foreach(target fft;pdi;splines)
-   if(TARGET DDC::ddc_${target})
-      add_library(DDC::${target} ALIAS DDC::ddc_${target})
+# Check components
+foreach(target_comp fft;pdi;splines)
+   if(TARGET DDC::ddc_${target_comp})
+      set(DDC_${target_comp}_FOUND TRUE)
+      add_library(DDC::${target_comp} ALIAS DDC::ddc_${target_comp})
    endif()
 endforeach()
 

install_test/CMakeLists.txt

@@ -5,13 +5,13 @@
 cmake_minimum_required(VERSION 3.22)
 project(test-installed-ddc LANGUAGES CXX)
 
-find_package(DDC REQUIRED)
+find_package(DDC REQUIRED COMPONENTS fft pdi splines)
 
 message("DDC options:")
 message("DDC_BUILD_DOUBLE_PRECISION=${DDC_BUILD_DOUBLE_PRECISION}")
-message("DDC_BUILD_KERNELS_FFT=${DDC_BUILD_KERNELS_FFT}")
-message("DDC_BUILD_KERNELS_SPLINES=${DDC_BUILD_KERNELS_SPLINES}")
-message("DDC_BUILD_PDI_WRAPPER=${DDC_BUILD_PDI_WRAPPER}")
+message("DDC_fft_FOUND=${DDC_fft_FOUND}")
+message("DDC_splines_FOUND=${DDC_splines_FOUND}")
+message("DDC_pdi_FOUND=${DDC_pdi_FOUND}")
 
 add_executable(main main.cpp)
 target_link_libraries(main PRIVATE DDC::ddc DDC::fft DDC::pdi DDC::splines)