cmake: keep compatibility with blosc2 < 2.10.1

CMakeLists.txt

@@ -196,6 +196,8 @@ 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

@@ -68,14 +68,30 @@ function(lists_get_prefix listVars outVar)
 endfunction()
 
 # Blosc2
-option(ADIOS2_PREFER_SHARED_Blosc2 "prefer sharred Blosc2 libraries" ON)
 if(ADIOS2_USE_Blosc2 STREQUAL AUTO)
-  find_package(Blosc2 2.10.1 CONFIG)
+  # 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 2.10.1 CONFIG 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)
   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:${ADIO2_Blosc2_PREFER_SHARED}>,shared,static>)
+  endif()
+  add_library(adios2_blosc2 ALIAS ${adios2_blosc2_tgt})
 endif()
 
 # BZip2

source/adios2/CMakeLists.txt

@@ -259,11 +259,7 @@ endif()
 
 if(ADIOS2_HAVE_Blosc2)
   target_sources(adios2_core PRIVATE operator/compress/CompressBlosc.cpp)
-  if(ADIOS2_PREFER_SHARED_Blosc2 AND TARGET Blosc2::blosc2_shared)
-    target_link_libraries(adios2_core PRIVATE Blosc2::blosc2_shared)
-  else()
-    target_link_libraries(adios2_core PRIVATE Blosc2::blosc2_static)
-  endif()
+  target_link_libraries(adios2_core PRIVATE adios2_blosc2)
 endif()
 
 if(ADIOS2_HAVE_BZip2)