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>

2 files changed, 0 insertions, 145 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
diff --git a/config/cmake_ext_mod/HDFUseCXX.cmake b/config/cmake_ext_mod/HDFUseCXX.cmake
deleted file mode 100644
index 423f74a..0000000
--- a/config/cmake_ext_mod/HDFUseCXX.cmake
+++ /dev/null
@@ -1,99 +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.
-#
-#
-# This file provides functions for C++ support.
-#
-#-------------------------------------------------------------------------------
-ENABLE_LANGUAGE (CXX)
-set (HDF_PREFIX "H5")
-
-#-------------------------------------------------------------------------------
-#  Fix CXX flags if we are compiling staticly on Windows using
-#  Windows_MT.cmake from config/cmake/UserMacros
-#-------------------------------------------------------------------------------
-if (BUILD_STATIC_CRT_LIBS)
-  TARGET_STATIC_CRT_FLAGS ()
-endif ()
-
-#-----------------------------------------------------------------------------
-# Configure Checks which require CXX compilation must go in here
-# not in the main ConfigureChecks.cmake files, because if the user has
-# no CXX compiler, problems arise.
-#-----------------------------------------------------------------------------
-include (CheckIncludeFileCXX)
-include (TestForSTDNamespace)
-
-# For other CXX specific tests, use this MACRO.
-macro (HDF_CXX_FUNCTION_TEST OTHER_TEST)
-  if (NOT DEFINED ${OTHER_TEST})
-    set (MACRO_CHECK_FUNCTION_DEFINITIONS "-D${OTHER_TEST} ${CMAKE_REQUIRED_FLAGS}")
-    set (OTHER_TEST_ADD_LIBRARIES)
-    if (HDF5_REQUIRED_LIBRARIES)
-      set (OTHER_TEST_ADD_LIBRARIES "-DLINK_LIBRARIES:STRING=${HDF5_REQUIRED_LIBRARIES}")
-    endif ()
-
-    foreach (def
-        HAVE_SYS_TIME_H
-        HAVE_UNISTD_H
-        HAVE_SYS_TYPES_H
-        HAVE_SYS_SOCKET_H
-        HAVE_SYS_FILE_H
-    )
-      if ("${${HDF_PREFIX}_${def}}")
-        set (MACRO_CHECK_FUNCTION_DEFINITIONS "${MACRO_CHECK_FUNCTION_DEFINITIONS} -D${def}")
-      endif ()
-    endforeach ()
-
-    if (LARGEFILE)
-      set (MACRO_CHECK_FUNCTION_DEFINITIONS
-          "${MACRO_CHECK_FUNCTION_DEFINITIONS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE"
-      )
-    endif ()
-
-    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-      message (TRACE "Performing ${OTHER_TEST}")
-    endif ()
-    TRY_COMPILE (${OTHER_TEST}
-        ${CMAKE_BINARY_DIR}
-        ${HDF_RESOURCES_EXT_DIR}/HDFCXXTests.cpp
-        CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
-        "${OTHER_TEST_ADD_LIBRARIES}"
-        OUTPUT_VARIABLE OUTPUT
-    )
-    if (${OTHER_TEST} EQUAL 0)
-      set (${OTHER_TEST} 1 CACHE INTERNAL "CXX test ${FUNCTION}")
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE "Performing CXX Test ${OTHER_TEST} - Success")
-      endif ()
-    else ()
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE "Performing CXX Test ${OTHER_TEST} - Failed")
-      endif ()
-      set (${OTHER_TEST} "" CACHE INTERNAL "CXX test ${FUNCTION}")
-      file (APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
-          "Performing CXX Test ${OTHER_TEST} failed with the following output:\n"
-          "${OUTPUT}\n"
-      )
-    endif ()
-  endif ()
-endmacro ()
-
-#-----------------------------------------------------------------------------
-# Check a bunch of cxx functions
-#-----------------------------------------------------------------------------
-if (CMAKE_CXX_COMPILER_LOADED)
-  foreach (cxx_test
-      CXX_HAVE_OFFSETOF
-  )
-    HDF_CXX_FUNCTION_TEST (${cxx_test})
-  endforeach ()
-endif ()