Update and clarify dependencies

CMakeLists.txt

@@ -63,7 +63,7 @@ endif()
 
 if("${DDC_BUILD_PDI_WRAPPER}")
     if(NOT TARGET PDI::PDI_C)
-        find_package(PDI REQUIRED COMPONENTS C)
+        find_package(PDI 1.6...<2 REQUIRED COMPONENTS C)
     endif()
 endif()
 
@@ -79,15 +79,17 @@ if("${BUILD_TESTING}" AND "${DDC_BUILD_TESTS}")
 
     if("${DDC_GTest_DEPENDENCY_POLICY}" STREQUAL "AUTO")
         if(NOT TARGET GTest::GTest AND NOT TARGET GTest::gtest)
-            find_package(GTest QUIET)
+            # 1.14...<2 but GTest module does not support range version
+            find_package(GTest 1.14 QUIET)
             if(NOT GTest_FOUND)
                 ddc_configure_googletest()
             endif()
         endif()
     elseif("${DDC_GTest_DEPENDENCY_POLICY}" STREQUAL "EMBEDDED")
         ddc_configure_googletest()
     elseif("${DDC_GTest_DEPENDENCY_POLICY}" STREQUAL "INSTALLED")
-        find_package(GTest REQUIRED)
+        # 1.14...<2 but GTest module does not support range version
+        find_package(GTest 1.14 REQUIRED)
     endif()
 endif()
 
@@ -103,22 +105,22 @@ if("${DDC_BUILD_BENCHMARKS}")
 
     if("${DDC_benchmark_DEPENDENCY_POLICY}" STREQUAL "AUTO")
         if(NOT TARGET benchmark::benchmark)
-            find_package(benchmark QUIET)
+            find_package(benchmark 1.8...<2 QUIET)
             if(NOT benchmark_FOUND)
                 ddc_configure_benchmark()
             endif()
         endif()
     elseif("${DDC_benchmark_DEPENDENCY_POLICY}" STREQUAL "EMBEDDED")
         ddc_configure_benchmark()
     elseif("${DDC_benchmark_DEPENDENCY_POLICY}" STREQUAL "INSTALLED")
-        find_package(benchmark REQUIRED)
+        find_package(benchmark 1.8...<2 REQUIRED)
     endif()
 endif()
 
 ## Doxygen
 
 if("${DDC_BUILD_DOCUMENTATION}")
-    find_package(Doxygen 1.8.13 REQUIRED OPTIONAL_COMPONENTS dot)
+    find_package(Doxygen 1.8.13...<2 REQUIRED OPTIONAL_COMPONENTS dot)
 endif()
 
 # Our project
@@ -203,6 +205,8 @@ if("${DDC_BUILD_KERNELS_SPLINES}")
     )
     if("${DDC_KokkosKernels_DEPENDENCY_POLICY}" STREQUAL "AUTO")
         if(NOT TARGET Kokkos::kokkoskernels)
+            # fork https://github.com/yasahi-hpc/kokkos-kernels
+            # on branch develop-spline-kernels-v2
             find_package(KokkosKernels QUIET)
             if(NOT KokkosKernels_FOUND)
                 ddc_configure_kokkos_kernels()
@@ -211,6 +215,8 @@ if("${DDC_BUILD_KERNELS_SPLINES}")
     elseif("${DDC_KokkosKernels_DEPENDENCY_POLICY}" STREQUAL "EMBEDDED")
         ddc_configure_kokkos_kernels()
     elseif("${DDC_KokkosKernels_DEPENDENCY_POLICY}" STREQUAL "INSTALLED")
+        # fork https://github.com/yasahi-hpc/kokkos-kernels
+        # on branch develop-spline-kernels-v2
         find_package(KokkosKernels REQUIRED)
     endif()
 

README.md

@@ -29,6 +29,28 @@ If you like the project, please leave us a github star.
 
 If you want to know more, join un on [Slack](https://join.slack.com/t/ddc-lib/shared_invite/zt-14b6rjcrn-AwSfM6_arEamAKk_VgQPhg)
 
+## Prerequisites
+
+To use DDC core, one needs the following dependencies:
+
+* a C++17-compliant compiler
+* CMake 3.22...<4
+* Kokkos 4.4...4.5
+* (optional, micro benchmarking) Benchmark 1.8...<2
+* (optional, documentation) Doxygen 1.8.13...<2
+* (optional, unit-testing) GoogleTest 1.14...<2
+
+To use DDC components, one needs the following dependencies:
+
+* (optional, fft interface) DDC::fft
+  * Kokkos-fft 0.2.1...<1
+* (optional, IO interface) DDC::pdi
+  * PDI 1.6...<2
+* (optional, spline interpolation) DDC::splines
+  * Ginkgo 1.8.0
+  * Kokkos Kernels fork <https://github.com/yasahi-hpc/kokkos-kernels> on branch develop-spline-kernels-v2
+
+
 ## Getting the code and basic configuration
 
 ```bash

cmake/DDCConfig.cmake.in

@@ -28,11 +28,13 @@ if(@DDC_BUILD_KERNELS_SPLINES@)
    list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
    ddc_find_dependency(LAPACKE)
    list(POP_FRONT CMAKE_MODULE_PATH)
+   # fork https://github.com/yasahi-hpc/kokkos-kernels
+   # on branch develop-spline-kernels-v2
    ddc_find_dependency(KokkosKernels)
 endif()
 
 if(@DDC_BUILD_PDI_WRAPPER@)
-   ddc_find_dependency(PDI COMPONENTS C)
+   ddc_find_dependency(PDI 1.6...<2 COMPONENTS C)
 endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/DDCTargets.cmake)