From f542f5aa37dea0f8dc15c3a5d91b4d12eda5fcf2 Mon Sep 17 00:00:00 2001
From: Dana Robinson <derobins@hdfgroup.org>
Date: Wed, 26 Aug 2020 13:27:07 -0700
Subject: Adds binary compatibility HDFS VFD stubs.

---
 src/H5FDhdfs.c | 40 +++++++++++++++++++++++++++++++++++++++-
 src/H5FDhdfs.h |  2 --
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/H5FDhdfs.c b/src/H5FDhdfs.c
index b4f70c9..4978d64 100644
--- a/src/H5FDhdfs.c
+++ b/src/H5FDhdfs.c
@@ -20,8 +20,14 @@
  *             File System (HDFS).
  */
 
-/* This source code file is part of the H5FD driver module */
+#ifdef H5_HAVE_LIBHDFS
+/* This source code file is part of the H5FD driver module
+ * NOTE: If we're just building the binary compatibility stubs,
+ * we're never going to really initialize the package, so we
+ * don't include this.
+ */
 #include "H5FDdrvr_module.h"
+#endif /* H5_HAVE_LIBHDFS */
 
 #include "H5private.h"      /* Generic Functions        */
 #include "H5Eprivate.h"     /* Error handling           */
@@ -1735,5 +1741,37 @@ H5FD__hdfs_unlock(H5FD_t H5_ATTR_UNUSED *_file)
 
     FUNC_LEAVE_NOAPI(SUCCEED)
 } /* end H5FD__hdfs_unlock() */
+
+#else /* H5_HAVE_LIBHDFS */
+
+/* No-op stubs to avoid binary compatibility problems with previous
+ * HDF5 1.10 versions. Non-functional versions of these API calls were
+ * erroneously included in the library even when the HDFS VFD was not
+ * configured.
+ */
+hid_t
+H5FD_hdfs_init(void)
+{
+    /* This should never be called since the header doesn't invoke it */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_LEAVE_NOAPI(H5I_INVALID_HID)
+}
+
+herr_t
+H5Pget_fapl_hdfs(hid_t fapl_id, H5FD_hdfs_fapl_t *fa_out)
+{
+    FUNC_ENTER_API_NOINIT
+    H5TRACE2("e", "i*x", fapl_id, fa_out);
+    FUNC_LEAVE_API_NOINIT(FAIL)
+}
+
+herr_t
+H5Pset_fapl_hdfs(hid_t fapl_id, H5FD_hdfs_fapl_t *fa)
+{
+    FUNC_ENTER_API_NOINIT
+    H5TRACE2("e", "i*x", fapl_id, fa);
+    FUNC_LEAVE_API_NOINIT(FAIL)
+}
+
 #endif /* H5_HAVE_LIBHDFS */
 
diff --git a/src/H5FDhdfs.h b/src/H5FDhdfs.h
index e195550..58d7e6e 100644
--- a/src/H5FDhdfs.h
+++ b/src/H5FDhdfs.h
@@ -28,7 +28,6 @@
 #define H5FD_HDFS       (-1)
 #endif /* H5_HAVE_LIBHDFS */
 
-#ifdef H5_HAVE_LIBHDFS
 /****************************************************************************
  *
  * Structure: H5FD_hdfs_fapl_t
@@ -119,7 +118,6 @@ H5_DLL herr_t H5Pset_fapl_hdfs(hid_t fapl_id, H5FD_hdfs_fapl_t *fa);
 #ifdef __cplusplus
 }
 #endif
-#endif /* H5_HAVE_LIBHDFS */
 
 #endif /* ifndef H5FDhdfs_H */
 
-- 
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