1#!/bin/sh
2# Generates a small Makefile used in the root of the output
3# directory, to allow make to be started from there.
4# The Makefile also allow for more convenient build of external modules
5
6# Usage
7# $1 - Kernel src directory
8# $2 - Output directory
9
10
11test ! -r $2/Makefile -o -O $2/Makefile || exit 0
12# Only overwrite automatically generated Makefiles
13# (so we do not overwrite buildroot Makefile)
14if test -e $2/Makefile && ! grep -q Automatically $2/Makefile
15then
16	exit 0
17fi
18echo "  GEN     $2/Makefile"
19
20cat << EOF > $2/Makefile
21# Automatically generated by $0: don't edit
22
23ifeq ("\$(origin V)", "command line")
24VERBOSE := \$(V)
25endif
26ifneq (\$(VERBOSE),1)
27Q := @
28endif
29
30lastword = \$(word \$(words \$(1)),\$(1))
31makedir := \$(dir \$(call lastword,\$(MAKEFILE_LIST)))
32
33MAKEARGS := -C $1
34MAKEARGS += O=\$(if \$(patsubst /%,,\$(makedir)),\$(CURDIR)/)\$(patsubst %/,%,\$(makedir))
35
36MAKEFLAGS += --no-print-directory
37
38.PHONY: _all \$(MAKECMDGOALS)
39
40all	:= \$(filter-out Makefile,\$(MAKECMDGOALS))
41
42_all:
43	\$(Q)umask 0022 && \$(MAKE) \$(MAKEARGS) \$(all)
44
45Makefile:;
46
47\$(all): _all
48	@:
49
50%/: _all
51	@:
52EOF
53