linux/scripts/mkmakefile
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   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 convinient build of external modules
   5
   6# Usage
   7# $1 - Kernel src directory
   8# $2 - Output directory
   9# $3 - version
  10# $4 - patchlevel
  11
  12
  13test ! -r $2/Makefile -o -O $2/Makefile || exit 0
  14# Only overwrite automatically generated Makefiles
  15# (so we do not overwrite kernel Makefile)
  16if test -e $2/Makefile && ! grep -q Automatically $2/Makefile
  17then
  18        exit 0
  19fi
  20if [ "${quiet}" != "silent_" ]; then
  21        echo "  GEN     $2/Makefile"
  22fi
  23
  24cat << EOF > $2/Makefile
  25# Automatically generated by $0: don't edit
  26
  27VERSION = $3
  28PATCHLEVEL = $4
  29
  30lastword = \$(word \$(words \$(1)),\$(1))
  31makedir := \$(dir \$(call lastword,\$(MAKEFILE_LIST)))
  32
  33ifeq ("\$(origin V)", "command line")
  34VERBOSE := \$(V)
  35endif
  36ifneq (\$(VERBOSE),1)
  37Q := @
  38endif
  39
  40MAKEARGS := -C $1
  41MAKEARGS += O=\$(if \$(patsubst /%,,\$(makedir)),\$(CURDIR)/)\$(patsubst %/,%,\$(makedir))
  42
  43MAKEFLAGS += --no-print-directory
  44
  45.PHONY: all \$(MAKECMDGOALS)
  46
  47all     := \$(filter-out all Makefile,\$(MAKECMDGOALS))
  48
  49all:
  50        \$(Q)\$(MAKE) \$(MAKEARGS) \$(all)
  51
  52Makefile:;
  53
  54\$(all): all
  55        @:
  56
  57%/: all
  58        @:
  59EOF
  60
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