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authorMasahiro Yamada <masahiroy@kernel.org>2023-01-28 18:24:23 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2023-02-05 18:51:22 +0900
commit67d7c3023a672c2b73d19d6d23684df670fce648 (patch)
treeaf506c3836b71368617d040c21cf53e83674e299 /drivers/Makefile
parentfeb113ad8be1bafcd0a3b93bae639be939af563c (diff)
downloadlwn-67d7c3023a672c2b73d19d6d23684df670fce648.tar.gz
lwn-67d7c3023a672c2b73d19d6d23684df670fce648.zip
kbuild: remove --include-dir MAKEFLAG from top Makefile
I added $(srctree)/ to some included Makefiles in the following commits: - 3204a7fb98a3 ("kbuild: prefix $(srctree)/ to some included Makefiles") - d82856395505 ("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>
Diffstat (limited to 'drivers/Makefile')
-rw-r--r--drivers/Makefile5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/Makefile b/drivers/Makefile
index bdf1c66141c9..62a9cb403a1a 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -6,6 +6,11 @@
# Rewritten to use lists instead of if-statements.
#
+# Some driver Makefiles miss $(srctree)/ for include directive.
+ifdef building_out_of_srctree
+MAKEFLAGS += --include-dir=$(srctree)
+endif
+
obj-y += irqchip/
obj-y += bus/