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diff --git a/config/clang-flags b/config/clang-flags
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+# -*- shell-script -*-
+#
+# Copyright by The HDF Group.
+# Copyright by the Board of Trustees of the University of Illinois.
+# 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://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+
+
+# This file should be sourced into configure if the compiler is the
+# Clang compiler or a derivative. It is careful not to do anything
+# if the compiler is not Clang; otherwise 'cc_flags_set' is set to 'yes'
+#
+
+#
+# For now, do not promote any warnings to errors.
+#
+PROMOTE_ERRORS_DFLT=no
+
+#
+# This filter rewrites -Werror= as -W, in that way demoting warnings
+# promoted to errors back to warnings, if PROMOTE_ERRORS is no.
+#
+demote_errors()
+{
+ if [ ${PROMOTE_ERRORS:-${PROMOTE_ERRORS_DFLT}} = no ]; then
+ sed 's,-Werror=,-W,g'
+ else
+ cat
+ fi
+}
+
+#
+# Prepend `$srcdir/config/clang-warnings/` to the filename suffix(es) given as
+# subroutine argument(s), remove comments starting with # and ending
+# at EOL, replace spans of whitespace (including newlines) with spaces,
+# and re-emit the file(s) thus filtered on the standard output stream.
+#
+load_clang_arguments()
+{
+ set -- $(for arg; do
+ sed 's,#.*$,,' $srcdir/config/clang-warnings/${arg}
+ done)
+ IFS=' ' echo "$*"
+}
+# Get the compiler version in a way that works for clang
+# unless a compiler version is already known
+#
+# cc_vendor: The compiler name: clang
+# cc_version: Version number: 6.0.0, 7.3.0, ... 10.0.1
+#
+if test "X-" = "X-$cc_flags_set"; then
+ # clang -v will return version number following "clang" on Linux machines,
+ # but on Macs the version number will follow "Apple LLVM version"
+ cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 |\
+ grep 'clang version' | sed 's/.*clang version \([-a-z0-9\.]*\).*/\1/'`"
+ if test -n "$cc_version"; then
+ cc_vendor="clang"
+ else
+ cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 |\
+ grep 'Apple LLVM version' | sed 's/.*Apple LLVM version \([-a-z0-9\.]*\).*/\1/'`"
+ if test -n "$cc_version"; then
+ cc_vendor="Apple LLVM"
+ fi
+ fi
+ if test "X-" != "X-$cc_version"; then
+
+ # Get the compiler version numbers
+ cc_vers_major=`echo $cc_version | cut -f1 -d.`
+ cc_vers_minor=`echo $cc_version | cut -f2 -d.`
+ cc_vers_patch=`echo $cc_version | cut -f3 -d.`
+ test -n "$cc_vers_major" || cc_vers_major=0
+ test -n "$cc_vers_minor" || cc_vers_minor=0
+ test -n "$cc_vers_patch" || cc_vers_patch=0
+ fi
+fi
+
+if test "X-clang" = "X-$cc_vendor" -o "X-Apple LLVM" = "X-$cc_vendor"; then
+ echo "compiler '$CC' is $cc_vendor-$cc_version"
+ ###############################
+ # Architecture-specific flags #
+ ###############################
+
+ arch=
+ case "$host_os-$host_cpu" in
+ # FreeBSD sets the information from "uname -m" to the general machine
+ # architecture, not the specific CPU for the machine, so even our
+ # Pentium II Xeon server is set to "i386". Once we know we are on a FreeBSD
+ # machine, use the "sysctl" command to get the CPU hardware model.
+ freebsd*-i386)
+ host_cpu_model=`sysctl -n hw.model`
+ case "$host_cpu_model" in
+ # Hmm.. this might not catch Celerons, but it won't hurt them either...
+ *Pro*|*II*|*III*|*IV*|*Athlon*)
+ # architecture-specific optimizations cause problems
+ # for some users who build binaries to be used on
+ # multiple architectures.
+ # arch="-march=i686"
+ ;;
+ esac
+ ;;
+
+ *-i686)
+ # architecture-specific optimizations cause problems
+ # for some users who build binaries to be used on
+ # multiple architectures.
+ # arch="-march=i686"
+ ;;
+ esac
+
+ case "$host_os-$host_cpu" in
+ # cygwin needs the "-std=c99" flag removed, so make
+ # a specific case for Cygwin without the flag and a default
+ # case to add the flag everywhere else
+ cygwin-*)
+ ;;
+
+ *)
+ H5_CFLAGS="$H5_CFLAGS -std=c99"
+ ;;
+ esac
+
+ H5_CFLAGS="$H5_CFLAGS $arch"
+
+ ##############
+ # Production #
+ ##############
+
+ # NDEBUG is handled explicitly by the configure script
+ PROD_CFLAGS=
+
+ #########
+ # Debug #
+ #########
+
+ # NDEBUG is handled explicitly by the configure script
+ # -g is handled by the symbols flags
+ DEBUG_CFLAGS="-ftrapv -fno-common"
+
+ ###########
+ # Symbols #
+ ###########
+
+ NO_SYMBOLS_CFLAGS=
+ SYMBOLS_CFLAGS="-g"
+
+ #############
+ # Profiling #
+ #############
+
+ PROFILE_CFLAGS="-pg"
+
+ ################
+ # Optimization #
+ ################
+
+ HIGH_OPT_CFLAGS="-O3"
+ DEBUG_OPT_CFLAGS="-g"
+ NO_OPT_CFLAGS="-O0"
+
+ ############
+ # Warnings #
+ ############
+
+ ###########
+ # General #
+ ###########
+
+ H5_CFLAGS="$H5_CFLAGS $(load_clang_arguments general)"
+ H5_ECFLAGS="$H5_ECFLAGS $(load_clang_arguments error-general)"
+
+ ######################
+ # Developer warnings #
+ ######################
+
+ NO_DEVELOPER_WARNING_CFLAGS=$(load_clang_arguments no-developer-general)
+ DEVELOPER_WARNING_CFLAGS=$(load_clang_arguments developer-general)
+
+ #############################
+ # Version-specific warnings #
+ #############################
+
+
+ #################
+ # Flags are set #
+ #################
+ cc_flags_set=yes
+fi
+
+# Clear cc info if no flags set
+if test "X$cc_flags_set" = "X"; then
+ cc_vendor=
+ cc_version=
+fi
+