Warn about disabled HDF5 at runtime, not compile.

Maybe I don't want HDF5 at all. Still, print a warning every time you
run an HDF5-related function. It would make sense to remove the
functions completely, such that the user must disable the function calls
as well.

include/Cubism/HDF5Dumper.h

@@ -33,6 +33,15 @@ template <> inline hid_t get_hdf5_type<double>() { return H5T_NATIVE_DOUBLE; }
 
 CUBISM_NAMESPACE_BEGIN
 
+inline void _warn_no_hdf5(void) {
+    static bool first = true;
+    if (first) {
+        fprintf(stderr, "USE OF HDF WAS DISABLED AT COMPILE TIME\n");
+        first = false;
+    }
+}
+
+
 // The following requirements for the data TStreamer are required:
 // TStreamer::NCHANNELS        : Number of data elements (1=Scalar, 3=Vector, 9=Tensor)
 // TStreamer::operate          : Data access methods for read and write
@@ -197,7 +206,7 @@ void DumpHDF5(const TGrid &grid,
         fclose(xmf);
     }
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }
 
@@ -276,7 +285,7 @@ void ReadHDF5(TGrid &grid, const std::string& fname, const std::string& dpath=".
 
     delete [] array_all;
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }
 

include/Cubism/HDF5Dumper_MPI.h

@@ -233,7 +233,7 @@ void DumpHDF5_MPI(const TGrid &grid,
         fclose(xmf);
     }
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }
 
@@ -325,7 +325,7 @@ void ReadHDF5_MPI(TGrid &grid, const std::string& fname, const std::string& dpat
 
     delete [] array_all;
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }
 

include/Cubism/HDF5SliceDumper.h

@@ -450,7 +450,7 @@ void DumpSliceHDF5(const TSlice& slice,
     }
 
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }
 

include/Cubism/HDF5SliceDumperMPI.h

@@ -280,7 +280,7 @@ void DumpSliceHDF5MPI(const TSlice& slice,
         fclose(xmf);
     }
 #else
-#warning USE OF HDF WAS DISABLED AT COMPILE TIME
+    _warn_no_hdf5();
 #endif
 }