Develop libaec fix

CMakeFilters.cmake

@@ -173,20 +173,26 @@ if (HDF5_ENABLE_SZIP_SUPPORT)
     set(libaec_USE_STATIC_LIBS ${HDF5_USE_LIBAEC_STATIC})
     set(SZIP_FOUND FALSE)
     # Search pure Config mode, there is not a FindSZIP module available
-    find_package (SZIP NAMES ${LIBAEC_PACKAGE_NAME}${HDF_PACKAGE_EXT} OPTIONAL_COMPONENTS ${LIBAEC_SEARCH_TYPE})
-    set(H5_SZIP_FOUND ${SZIP_FOUND})
+    find_package ({LIBAEC_PACKAGE_NAME} NAMES ${LIBAEC_PACKAGE_NAME}${HDF_PACKAGE_EXT} OPTIONAL_COMPONENTS ${LIBAEC_SEARCH_TYPE})
+    set(H5_SZIP_FOUND ${{LIBAEC_PACKAGE_NAME}_FOUND})
     if (H5_SZIP_FOUND)
       set (H5_SZIP_INCLUDE_DIR_GEN ${SZIP_INCLUDE_DIR})
       set (H5_SZIP_INCLUDE_DIRS ${H5_SZIP_INCLUDE_DIRS} ${SZIP_INCLUDE_DIR})
-      set (LINK_COMP_LIBS ${LINK_COMP_LIBS} ${SZIP_LIBRARIES})
+      if(LIBAEC_PACKAGE_NAME STREQUAL "libaec")
+        set (LINK_COMP_LIBS ${LINK_COMP_LIBS} libaec::sz libaec::aec)
+      else ()
+        set (LINK_COMP_LIBS ${LINK_COMP_LIBS} ${SZIP_LIBRARIES})
+      endif ()
     endif ()
+    message (VERBOSE "H5_SZIP_FOUND=${SZIP_FOUND} and LINK_COMP_LIBS=${LINK_COMP_LIBS}")
   else ()
     if (HDF5_ALLOW_EXTERNAL_SUPPORT MATCHES "GIT" OR HDF5_ALLOW_EXTERNAL_SUPPORT MATCHES "TGZ")
       EXTERNAL_SZIP_LIBRARY (${HDF5_ALLOW_EXTERNAL_SUPPORT} ${HDF5_ENABLE_SZIP_ENCODING})
       message (VERBOSE "Filter SZIP is built using library AEC")
       set (LINK_COMP_LIBS ${LINK_COMP_LIBS} ${H5_SZIP_STATIC_LIBRARY})
     endif ()
   endif ()
+  message (VERBOSE "LINK_COMP_LIBS=${LINK_COMP_LIBS}")
   if (H5_SZIP_FOUND)
     set (H5_HAVE_FILTER_SZIP 1)
     set (H5_HAVE_SZLIB_H 1)

release_docs/INSTALL_CMake.txt

@@ -285,7 +285,7 @@ IV. Further considerations
       web site. The HDF5 2."X"."Y" product requires a minimum CMake version 3.18.
       If you are using VS2022, the CMake minimum version is 3.21.
 
-   2. If you plan to use Zlib or Szip:
+   2. If you plan to use Zlib or Szip (libaec):
       A. Download the binary packages and install them in a central location.
          For example on Windows, create a folder extlibs and install the
          packages there. Add the following CMake options:
@@ -295,10 +295,15 @@ IV. Further considerations
             -DSZIP_LIBRARY:FILEPATH=some_location/lib/szlib.lib
             -DSZIP_INCLUDE_DIR:PATH=some_location/include
             -DSZIP_USE_EXTERNAL:BOOL=OFF
+            (For libaec use -Dlibaec_* options instead of -DSZIP_* options)
          where "some_location" is the full path to the extlibs folder.
          Also the appropriate environment variable must be set;
             set(ENV{ZLIB_ROOT} "some_location")
             set(ENV{SZIP_ROOT} "some_location")
+            set(ENV{libaec_ROOT} "some_location")
+
+        Note that if there is a problem finding the libraries, try adding the
+        CMake variable CMAKE_FIND_DEBUG_MODE:BOOL=ON to the command line.
 
       B. Use source packages from an GIT server by adding the following CMake
          options:

release_docs/RELEASE.txt

@@ -540,6 +540,20 @@ Bug Fixes since HDF5-2.0.0 release
 
     Configuration
     -------------
+    - Use pre-installed libaec compression library
+
+      The CMake logic for finding the libaec compression library has been
+      modified for a system-installed version of the library. Two options
+      must be set;
+          HDF5_ALLOW_EXTERNAL_SUPPORT:STRING=NO
+          <LIB_PKG_NAME>_USE_EXTERNAL:BOOL=OFF
+      where <LIB_PKG_NAME> is one of ZLIB, ZLIBNG, SZIP, PLUGIN.
+      Note that HDF5_ALLOW_EXTERNAL_SUPPORT:STRING=NO disables building all plugins
+      and external libraries in-line with the HDF5 library. In addition, the
+      <LIB_PKG_NAME>_ROOT environment variables must be set, where <LIB_PKG_NAME>
+      is one of ZLIB, ZLIBNG, SZIP, libaec, PLUGIN. Note that libaec is the 
+      expected name for using the libaec library in place of original szip.
+
     - Changed the zlib/szip compression find message to FATAL ERROR
 
       The message was changed to indicate that zlib/szip compression was requested and