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kbuild: make wrapper Makefile more convenient for external modules

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When Kbuild starts building in a separate output directory, it generates
a wrapper Makefile, allowing you to invoke 'make' from the output
directory.

This commit makes it more convenient, so you can invoke 'make' without
M= or MO=.

First, you need to build external modules in a separate directory:

  $ make M=/path/to/module/source/dir MO=/path/to/module/build/dir

Once the wrapper Makefile is generated in /path/to/module/build/dir,
you can proceed as follows:

  $ cd /path/to/module/build/dir
  $ make

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada 2024-11-10 10:34:38 +09:00
parent 822b11a74b
commit a2a45ebee0
1 changed files with 11 additions and 1 deletions
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12
Makefile
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@ -642,10 +642,20 @@ ifdef building_out_of_srctree
# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
ifdef KBUILD_EXTMOD
print_env_for_makefile = \
echo "export KBUILD_OUTPUT = $(objtree)"; \
echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
else
print_env_for_makefile = \
echo "export KBUILD_OUTPUT = $(CURDIR)"
endif
quiet_cmd_makefile = GEN Makefile
cmd_makefile = { \
echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
echo "export KBUILD_OUTPUT = $(CURDIR)"; \
$(print_env_for_makefile); \
echo "include $(abs_srctree)/Makefile"; \
} > Makefile