Masahiro Yamada 67d7c3023a kbuild: remove --include-dir MAKEFLAG from top Makefile ... 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>		2023-02-05 18:51:22 +09:00
..
clone.c	um: fix stub location calculation	2021-08-26 22:28:03 +02:00
Makefile	kbuild: remove --include-dir MAKEFLAG from top Makefile	2023-02-05 18:51:22 +09:00
mmu.c	um: remove process stub VMA	2021-02-12 21:37:38 +01:00
process.c	um: Add SPDX headers to files in arch/um/kernel/	2019-09-15 21:37:17 +02:00
syscall.c	x86/syscalls: Use __NR_syscalls instead of __NR_syscall_max	2021-05-20 15:03:59 +02:00
uaccess.c	Peter Zijlstra says:	2022-01-11 17:24:45 -08:00