If the directory pass given to KBUILD_EXTMOD (or M=) contains % or :, the module fails to build. % is used in pattern rules, and : as the separator of dependencies. Bail out with a clearer error message. Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> --- Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Makefile b/Makefile index faa4880f25f7..ecda62e27553 100644 --- a/Makefile +++ b/Makefile @@ -129,6 +129,9 @@ endif $(if $(word 2, $(KBUILD_EXTMOD)), \ $(error building multiple external modules is not supported)) +$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ + $(error module directory path cannot contain '$x'))) + # Remove trailing slashes ifneq ($(filter %/, $(KBUILD_EXTMOD)),) KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) -- 2.34.1
