scripts/mkmakefile

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Generates a small Makefile used in the root of the output
   4 # directory, to allow make to be started from there.
   5 # The Makefile also allow for more convinient build of external modules
   6
   7 # Usage
   8 # $1 - Kernel src directory
   9
  10 # Only overwrite automatically generated Makefiles
  11 # (so we do not overwrite kernel Makefile)
  12 if test -e Makefile && ! grep -q Automatically Makefile
  13 then
  14         exit 0
  15 fi
  16 if [ "${quiet}" != "silent_" ]; then
  17         echo "  GEN     Makefile"
  18 fi
  19
  20 cat << EOF > Makefile
  21 # Automatically generated by $0: don't edit
  22
  23 ifeq ("\$(origin V)", "command line")
  24 VERBOSE := \$(V)
  25 endif
  26 ifneq (\$(VERBOSE),1)
  27 Q := @
  28 endif
  29
  30 MAKEFLAGS += --no-print-directory
  31
  32 .PHONY: __sub-make \$(MAKECMDGOALS)
  33
  34 __sub-make:
  35         \$(Q)\$(MAKE) -C $1 O=\$(CURDIR) \$(MAKECMDGOALS)
  36
  37 \$(filter-out __sub-make, \$(MAKECMDGOALS)): __sub-make
  38         @:
  39 EOF