adding support for NETCDF_INTEGRATION option to cmake, also fixing cm…

…ake build issue in read-only directories

CMakeLists.txt

@@ -77,6 +77,7 @@ option (PIO_ENABLE_LOGGING   "Enable debug logging (large output possible)" OFF)
 option (PIO_ENABLE_DOC       "Enable building PIO documentation"            ON)
 option (PIO_ENABLE_COVERAGE  "Enable code coverage"                         OFF)
 option (PIO_ENABLE_EXAMPLES  "Enable PIO examples"                          ON)
+option (PIO_ENABLE_NETCDF_INTEGRATION  "Enable netCDF integration (netcdf-c-4.7.4 or later required)" ON)
 option (PIO_INTERNAL_DOC     "Enable PIO developer documentation"           OFF)
 option (PIO_TEST_BIG_ENDIAN  "Enable test to see if machine is big endian"  ON)
 option (PIO_USE_MPIIO        "Enable support for MPI-IO auto detect"        ON)
@@ -106,6 +107,13 @@ else()
   set(ENABLE_LOGGING 0)
 endif()
 
+# Set a variable that appears in the config.h.in file.
+if(PIO_ENABLE_NETCDF_INTEGRATION)
+  set(NETCDF_INTEGRATION 1)
+else()
+  set(NETCDF_INTEGRATION 0)
+endif()
+
 if(PIO_USE_MPISERIAL)
   set(USE_MPI_SERIAL 1)
 else()
@@ -416,7 +424,7 @@ INSTALL(FILES "${PIO_BINARY_DIR}/libpio.settings"
 #####
 configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/src/clib/pio_meta.h.in
-  ${CMAKE_CURRENT_SOURCE_DIR}/src/clib/pio_meta.h @ONLY)
+  ${CMAKE_CURRENT_BINARY_DIR}/src/clib/pio_meta.h @ONLY)
 
-FILE(COPY ${CMAKE_CURRENT_SOURCE_DIR}/src/clib/pio_meta.h
-  DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/src/clib/)
+# FILE(COPY ${CMAKE_CURRENT_SOURCE_DIR}/src/clib/pio_meta.h
+#   DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/src/clib/)

cmake_config.h.in

@@ -34,4 +34,6 @@
 
 #define HAVE_PAR_FILTERS @HAVE_PAR_FILTERS@
 
+#define NETCDF_INTEGRATION @NETCDF_INTEGRATION@
+
 #endif /* _PIO_CONFIG_ */