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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-08-08 20:21:11 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-08-10 01:45:31 +0900
commitc07d8d47bca1b325102fa2be3a463075f7b051d9 (patch)
tree4b74298449e30cd5c1526b373bf5bfde0dda4ad9 /scripts
parent4f2c8f3089f538f556c86f26603a062865e4aa94 (diff)
downloadlinux-stericsson-c07d8d47bca1b325102fa2be3a463075f7b051d9.tar.gz
kbuild: show hint if subdir-y/m is used to visit module Makefile
Since commit ff9b45c55b26 ("kbuild: modpost: read modules.order instead of $(MODVERDIR)/*.mod"), a module is no longer built in the following pattern: [Makefile] subdir-y := some-module [some-module/Makefile] obj-m := some-module.o You cannot write Makefile this way in upstream because modules.order is not correctly generated. subdir-y is used to descend to a sub-directory that builds tools, device trees, etc. For external modules, the modules order does not matter. So, the Makefile above was known to work. I believe the Makefile should be re-written as follows: [Makefile] obj-m := some-module/ [some-module/Makefile] obj-m := some-module.o However, people will have no idea if their Makefile suddenly stops working. In fact, I received questions from multiple people. Show a warning for a while if obj-m is specified in a Makefile visited by subdir-y or subdir-m. I touched the %/ rule to avoid false-positive warnings for the single target. Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Tom Stonecypher <thomas.edwardx.stonecypher@intel.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.build7
1 files changed, 7 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 37a1d2cd49d4..2f66ed388d1c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -52,6 +52,13 @@ ifndef obj
$(warning kbuild: Makefile.build is included improperly)
endif
+ifeq ($(MAKECMDGOALS)$(need-modorder),)
+ifneq ($(obj-m),)
+$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
+$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
+endif
+endif
+
# ===========================================================================
ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)