Messages in this thread Patch in this message | | | From | Masahiro Yamada <> | Subject | [PATCH 2/5] kbuild: define KBUILD_MODNAME even if multiple modules share objects | Date | Thu, 8 Mar 2018 10:05:00 +0900 |
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Currently, KBUILD_MODNAME is defined only when $(modname) contains just one word. If an object is shared among multiple modules, undefined KBUILD_MODNAME could cause a build error. For example, if CONFIG_DYNAMIC_DEBUG is enabled, any call of printk() populates .modname, then fails to build due to undefined KBUILD_MODNAME.
Take the following code as an example:
obj-m += foo.o obj-m += bar.o foo-objs := foo-bar-common.o foo-main.o bar-objs := foo-bar-common.o bar-main.o
In this case, there is room for argument what to define for KBUILD_MODNAME when foo-bar-common.o is being compiled. "foo", "bar", or what else?
One idea is to define colon-separated modules that share the object, in this case, "bar:foo" (modules are sorted alphabetically by $(sort ...).
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> ---
scripts/Makefile.lib | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index a7e315f..a1fbd6a 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -92,8 +92,7 @@ subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) # differ in different configs. name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) -modname_flags = $(if $(filter 1,$(words $(modname))),\ - -DKBUILD_MODNAME=$(call name-fix,$(modname))) +modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ $(ccflags-y) $(CFLAGS_$(basetarget).o) @@ -174,8 +173,10 @@ dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ -undef -D__DTS__ # Finds the multi-part object the current object will be linked into -modname-multi = $(sort $(foreach m,$(multi-used),\ - $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) +# If the object belongs to two or more multi-part objects, all of them are +# concatenated with a colon separator. +modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\ + $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))) # Useful for describing the dependency of composite objects # Usage: -- 2.7.4
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