@@ -641,10 +641,20 @@ 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 = $(_vpath)" ; \
+ 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
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> --- Makefile | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)