C++ warning and build fixes (#707)

* Committing clang-format changes

* C++ build and warning updates

* Fixes all warnings on C++ (with gcc 9.3)
* Updates CMake and Autotools C++ builds

* Undo warning clobber

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

1 files changed, 0 insertions, 46 deletions

diff --git a/config/cmake_ext_mod/HDFCXXTests.cpp b/config/cmake_ext_mod/HDFCXXTests.cpp
deleted file mode 100644
index 08ccb34..0000000
--- a/config/cmake_ext_mod/HDFCXXTests.cpp
+++ /dev/null
@@ -1,46 +0,0 @@
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright by The HDF Group.                                               *
- * All rights reserved.                                                      *
- *                                                                           *
- * This file is part of HDF5.  The full HDF5 copyright notice, including     *
- * terms governing use, modification, and redistribution, is contained in    *
- * the COPYING file, which can be found at the root of the source code       *
- * distribution tree, or in https://www.hdfgroup.org/licenses.               *
- * If you do not have access to either file, you may request a copy from     *
- * help@hdfgroup.org.                                                        *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-#ifdef CXX_HAVE_OFFSETOF
-
-#include <stdio.h>
-#include <stddef.h>
-
-#ifdef FC_DUMMY_MAIN
-#ifndef FC_DUMMY_MAIN_EQ_F77
-#  ifdef __cplusplus
-extern "C"
-#  endif
-int FC_DUMMY_MAIN()
-{ return 1;}
-#endif
-#endif
-int
-main ()
-{
-
-  struct index_st
-  {
-    unsigned char type;
-    unsigned char num;
-    unsigned int len;
-  };
-  typedef struct index_st index_t;
-  int x,y;
-  x = offsetof(struct index_st, len);
-  y = offsetof(index_t, num)
-
-  ;
-  return 0;
-}
-
-#endif