buildroot

#!/bin/sh

# Generates a small Makefile used in the root of the output

# directory, to allow make to be started from there.

# The Makefile also allow for more convenient build of external modules

​

# Usage

# $1 - Kernel src directory

# $2 - Output directory

​

​

test ! -r $2/Makefile -o -O $2/Makefile || exit 0

# Only overwrite automatically generated Makefiles

# (so we do not overwrite buildroot Makefile)

if test -e $2/Makefile && ! grep -q Automatically $2/Makefile

then

    exit 0

fi

if [ "${quiet}" != "silent_" ]; then

    echo "  GEN     $2/Makefile"

fi

​

cat << EOF > $2/Makefile

# Automatically generated by $0: don't edit

​

lastword = \$(word \$(words \$(1)),\$(1))

makedir := \$(dir \$(call lastword,\$(MAKEFILE_LIST)))

​

MAKEARGS := -C $1

MAKEARGS += O=\$(if \$(patsubst /%,,\$(makedir)),\$(CURDIR)/)\$(patsubst %/,%,\$(makedir))

​

MAKEFLAGS += --no-print-directory

​

.PHONY: _all \$(MAKECMDGOALS)

​

all := \$(filter-out Makefile,\$(MAKECMDGOALS))

​

_all:

    umask 0022 && \$(MAKE) \$(MAKEARGS) \$(all)

​

Makefile:;

​

\$(all): _all

    @:

​

%/: _all

    @:

EOF