kbuild: replace LANG=C with LC_ALL=C

LANG gives a weak default to each LC_* in case it is not explicitly
defined. LC_ALL, if set, overrides all other LC_* variables.

LANG < LC_CTYPE, LC_COLLATE, LC_MONETARY, LC_NUMERIC, ... < LC_ALL

This is why documentation such as [1] suggests to set LC_ALL in build
scripts to get the deterministic result.

LANG=C is not strong enough to override LC_* that may be set by end
users.

[1]: https://reproducible-builds.org/docs/locales/

Signed-off-by: Masahiro Yamada <[e-mail]>
Acked-by: Michael Ellerman <[e-mail]> (powerpc)
Reviewed-by: Matthias Maennich <[e-mail]>
Acked-by: Matthieu Baerts <[e-mail]> (mptcp)
Reviewed-by: Greg Kroah-Hartman <[e-mail]>

arch/powerpc/boot/wrapper

···
     kernel=vmlinux
 fi
 
-LANG=C elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print $4}'`"
+LC_ALL=C elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print $4}'`"
 case "$elfformat" in
     elf64-powerpcle)	format=elf64lppc	;;
     elf64-powerpc)	format=elf32ppc	;;

scripts/nsdeps

···
 		for source_file in $mod_source_files; do
 			sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
 			offset=$(wc -l ${source_file}.tmp | awk '{print $1;}')
-			cat $source_file | grep MODULE_IMPORT_NS | LANG=C sort -u >> ${source_file}.tmp
+			cat $source_file | grep MODULE_IMPORT_NS | LC_ALL=C sort -u >> ${source_file}.tmp
 			tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp
 			if ! diff -q ${source_file} ${source_file}.tmp; then
 				mv ${source_file}.tmp ${source_file}

scripts/recordmcount.pl

···
 #
 # Step 2: find the sections and mcount call sites
 #
-open(IN, "LANG=C $objdump -hdr $inputfile|") || die "error running $objdump";
+open(IN, "LC_ALL=C $objdump -hdr $inputfile|") || die "error running $objdump";
 
 my $text;
 

scripts/setlocalversion

···
 	fi
 
 	# Check for svn and a svn repo.
-	if rev=$(LANG= LC_ALL= LC_MESSAGES=C svn info 2>/dev/null | grep '^Last Changed Rev'); then
+	if rev=$(LC_ALL=C svn info 2>/dev/null | grep '^Last Changed Rev'); then
 		rev=$(echo $rev | awk '{print $NF}')
 		printf -- '-svn%s' "$rev"
 

scripts/tags.sh

···
 
 # Remove structure forward declarations.
 if [ -n "$remove_structs" ]; then
-    LANG=C sed -i -e '/^\([a-zA-Z_][a-zA-Z0-9_]*\)\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1
+    LC_ALL=C sed -i -e '/^\([a-zA-Z_][a-zA-Z0-9_]*\)\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1
 fi

tools/testing/selftests/net/mptcp/mptcp_connect.sh

···
 	ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0
 
 	local err=0
-	LANG=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
+	LC_ALL=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
 		grep -q "^socket: Protocol not available$" && err=1
 	ip netns delete ${disabled_ns}
 

usr/gen_initramfs.sh

···
 	header "$1"
 
 	srcdir=$(echo "$1" | sed -e 's://*:/:g')
-	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort)
+	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort)
 
 	# If $dirlist is only one line, then the directory is empty
 	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then