Introduced new cmake option "LIBS_BUILD_CGNS_ENABLE_HDF5" for manuall…

…y disabling the usage of HDF5 during CGNS compilation by subsequently setting -DCGNS_ENABLE_HDF5=${LIBS_BUILD_CGNS_ENABLE_HDF5} with the default value "ON".

CMakeListsLib.txt

@@ -426,6 +426,10 @@ ELSE()
       SET (CGNSDOWNLOAD ${LIBS_DLPATH}libs/cgns.git )
     ENDIF()
 
+    # Fallback for disabling HDF5 for CGNS compilation
+    OPTION(LIBS_BUILD_CGNS_ENABLE_HDF5 "Build CGNS library with -DCGNS_ENABLE_HDF5=ON" ON)
+    MESSAGE(STATUS "Build CGNS library with -DCGNS_ENABLE_HDF5=" ${LIBS_BUILD_CGNS_ENABLE_HDF5})
+
     # Build CGNS with HDF5 support
     EXTERNALPROJECT_ADD(cgns
       GIT_REPOSITORY ${CGNSDOWNLOAD}
@@ -435,7 +439,8 @@ ELSE()
       PREFIX ${LIBS_CGNS_DIR}
       CMAKE_ARGS  -DCMAKE_INSTALL_PREFIX=${LIBS_CGNS_DIR}/build -DCMAKE_PREFIX_PATH=${LIBS_HDF5_DIR} /
       -DCGNS_ENABLE_FORTRAN=ON   -DCGNS_ENABLE_64BIT=${LIBS_CGNS_64BIT} -DCGNS_BUILD_SHARED=OFF -DCGNS_USE_SHARED=OFF /
-      -DCMAKE_BUILD_TYPE=Release -DCGNS_BUILD_CGNSTOOLS=OFF -DCGNS_ENABLE_HDF5=ON -DCGNS_ENABLE_PARALLEL=OFF -DCGNS_ENABLE_TESTS=OFF -DCMAKE_SKIP_RPATH=ON /
+      -DCMAKE_BUILD_TYPE=Release -DCGNS_BUILD_CGNSTOOLS=OFF -DCGNS_ENABLE_HDF5=${LIBS_BUILD_CGNS_ENABLE_HDF5} /
+      -DCGNS_ENABLE_PARALLEL=OFF -DCGNS_ENABLE_TESTS=OFF -DCMAKE_SKIP_RPATH=ON /
     )
     # If HDF5 is built in HOPR, it must occur before the CGNS compilation (for the support of HDF5-based CGNS files)
     IF(LIBS_BUILD_HDF5)