cmake: Add Blosc2 2.10.1 compatibility.

- Give priority to Blosc2Config.cmake file rather than FindBlosc2.cmake.
- Prefer shared Blosc2 library.

Co-Authored-By: Axel Huebl <axel.huebl@plasma.ninja>

CMakeLists.txt

@@ -197,6 +197,8 @@ if(ADIOS2_HAVE_MPI)
   add_definitions(-DOMPI_SKIP_MPICXX -DMPICH_SKIP_MPICXX)
 endif()
 
+cmake_dependent_option(ADIOS2_Blosc2_PREFER_SHARED "Prefer shared Blosc2 libraries"
+  ON "Blosc2_shlib_available" OFF)
 
 #------------------------------------------------------------------------------#
 # POSIX O_DIRECT is only working for Unix in adios for now

cmake/DetectOptions.cmake

@@ -69,12 +69,31 @@ endfunction()
 
 # Blosc2
 if(ADIOS2_USE_Blosc2 STREQUAL AUTO)
-  find_package(Blosc2 2.4)
+  # Prefect CONFIG mode
+  find_package(Blosc2 2.4 CONFIG QUIET)
+  if(NOT Blosc2_FOUND)
+    find_package(Blosc2 2.4 MODULE QUIET)
+  endif()
 elseif(ADIOS2_USE_Blosc2)
-  find_package(Blosc2 2.4 REQUIRED)
+  # Prefect CONFIG mode
+  find_package(Blosc2 2.4 CONFIG REQUIRED)
+  if(NOT Blosc2_FOUND)
+    find_package(Blosc2 2.4 MODULE REQUIRED)
+  endif()
 endif()
-if(BLOSC2_FOUND)
+if(Blosc2_FOUND)
   set(ADIOS2_HAVE_Blosc2 TRUE)
+  if(TARGET Blosc2::blosc2_shared)
+    set(Blosc2_shlib_available ON)
+  endif()
+
+  set(adios2_blosc2_tgt Blosc2::Blosc2)
+  if (Blosc2_VERSION VERSION_GREATER_EQUAL 2.10.1)
+    set(adios2_blosc2_tgt Blosc2::blosc2_$<IF:$<BOOL:${ADIOS2_Blosc2_PREFER_SHARED}>,shared,static>)
+  endif()
+
+  add_library(adios2_blosc2 INTERFACE)
+  target_link_libraries(adios2_blosc2 INTERFACE ${adios2_blosc2_tgt})
 endif()
 
 # BZip2

source/adios2/CMakeLists.txt

@@ -273,9 +273,11 @@ if(ADIOS2_HAVE_DataSpaces)
   target_link_libraries(adios2_core_mpi PRIVATE DataSpaces::DataSpaces)
 endif()
 
+set(maybe_adios2_blosc2)
 if(ADIOS2_HAVE_Blosc2)
   target_sources(adios2_core PRIVATE operator/compress/CompressBlosc.cpp)
-  target_link_libraries(adios2_core PRIVATE Blosc2::Blosc2)
+  target_link_libraries(adios2_core PRIVATE adios2_blosc2)
+  set(maybe_adios2_blosc2 adios2_blosc2)
 endif()
 
 if(ADIOS2_HAVE_BZip2)
@@ -448,7 +450,7 @@ install(DIRECTORY toolkit/
 )
 
 # Library installation
-install(TARGETS adios2_core ${maybe_adios2_core_mpi} ${maybe_adios2_core_cuda} ${maybe_adios2_core_kokkos} EXPORT adios2Exports
+install(TARGETS adios2_core ${maybe_adios2_core_mpi} ${maybe_adios2_core_cuda} ${maybe_adios2_core_kokkos} ${maybe_adios2_blosc2} EXPORT adios2Exports
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT adios2_core-runtime
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT adios2_core-libraries NAMELINK_COMPONENT adios2_core-development
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT adios2_core-development