linux/scripts/mkmakefile
Masahiro Yamada 80d0dda3a4 kbuild: simplify command line creation in scripts/mkmakefile
Assuming we never invoke the generated Makefile from outside of
the $(objtree) directory, $(CURDIR) points to the absolute path
of $(objtree).

BTW, 'lastword' is natively supported by GNU Make 3.81+, which
is the current requirement for building the kernel.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-10-04 22:56:02 +09:00

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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# 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 convinient build of external modules
# Usage
# $1 - Kernel src directory
# Only overwrite automatically generated Makefiles
# (so we do not overwrite kernel Makefile)
if test -e Makefile && ! grep -q Automatically Makefile
then
exit 0
fi
if [ "${quiet}" != "silent_" ]; then
echo " GEN Makefile"
fi
cat << EOF > Makefile
# Automatically generated by $0: don't edit
ifeq ("\$(origin V)", "command line")
VERBOSE := \$(V)
endif
ifneq (\$(VERBOSE),1)
Q := @
endif
MAKEFLAGS += --no-print-directory
.PHONY: __sub-make \$(MAKECMDGOALS)
__sub-make:
\$(Q)\$(MAKE) -C $1 O=\$(CURDIR) \$(MAKECMDGOALS)
\$(filter-out __sub-make, \$(MAKECMDGOALS)): __sub-make
@:
EOF