kbuild: make module name conflict fatal error

# using awk while concatenating to the final file.

PHONY += modules

modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order

modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh

PHONY += modules_check

modules_check: modules.order

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<

modules.order: descend

	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@

set -e

if [ $# != 1 ]; then

	echo "Usage: $0 <modules.order>" >& 2

	exit 1

fi

exit_code=0

# Check uniqueness of module names

check_same_name_modules()

{

	for m in $(sed 's:.*/::' modules.order | sort | uniq -d)

	for m in $(sed 's:.*/::' $1 | sort | uniq -d)

	do

		echo "warning: same module names found:" >&2

		echo "error: the following would cause module name conflict:" >&2

		sed -n "/\/$m/s:^:  :p" modules.order >&2

		exit_code=1

	done

}

check_same_name_modules

check_same_name_modules "$1"

exit $exit_code