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I added $(srctree)/ to some included Makefiles in the following commits: -3204a7fb98("kbuild: prefix $(srctree)/ to some included Makefiles") -d828563955("kbuild: do not require sub-make for separate output tree builds") They were a preparation for removing --include-dir flag. I have never thought --include-dir useful. Rather, it _is_ harmful. For example, run the following commands: $ make -s ARCH=x86 mrproper defconfig $ make ARCH=arm O=foo dtbs make[1]: Entering directory '/tmp/linux/foo' HOSTCC scripts/basic/fixdep Error: kernelrelease not valid - run 'make prepare' to update it UPD include/config/kernel.release make[1]: Leaving directory '/tmp/linux/foo' The first command configures the source tree for x86. The next command tries to build ARM device trees in the separate foo/ directory - this must stop because the directory foo/ has not been configured yet. However, due to --include-dir=$(abs_srctree), the top Makefile includes the wrong include/config/auto.conf from the source tree and continues building. Kbuild traverses the directory tree, but of course it does not work correctly. The Error message is also pointless - 'make prepare' does not help at all for fixing the issue. This commit fixes more arch Makefile, and finally removes --include-dir from the top Makefile. There are more breakages under drivers/, but I do not volunteer to fix them all. I just moved --include-dir to drivers/Makefile. With this commit, the second command will stop with a sensible message. $ make -s ARCH=x86 mrproper defconfig $ make ARCH=arm O=foo dtbs make[1]: Entering directory '/tmp/linux/foo' SYNC include/config/auto.conf.cmd *** *** The source tree is not clean, please run 'make ARCH=arm mrproper' *** in /tmp/linux *** make[2]: *** [../Makefile:646: outputmakefile] Error 1 /tmp/linux/Makefile:770: include/config/auto.conf.cmd: No such file or directory make[1]: *** [/tmp/linux/Makefile:793: include/config/auto.conf.cmd] Error 2 make[1]: Leaving directory '/tmp/linux/foo' make: *** [Makefile:226: __sub-make] Error 2 Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
31 lines
655 B
Makefile
31 lines
655 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Fail on warnings - also for files referenced in subdirs
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# -Werror can be disabled for specific files using:
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# CFLAGS_<file.o> := -Wno-error
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ifeq ($(W),)
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subdir-ccflags-y := -Werror
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endif
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# platform specific definitions
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include $(srctree)/arch/mips/Kbuild.platforms
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obj-y := $(platform-y)
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# make clean traverses $(obj-) without having included .config, so
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# everything ends up here
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obj- := $(platform-y)
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# mips object files
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# The object files are linked as core-y files would be linked
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obj-y += kernel/
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obj-y += mm/
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obj-y += net/
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obj-y += vdso/
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ifdef CONFIG_KVM
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obj-y += kvm/
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endif
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# for cleaning
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subdir- += boot
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