path: root/scripts/Makefile.lib
diff options
authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-19 18:01:24 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-26 02:01:25 +0900
commitaeacb019b61c4ea7689085574bd03d2c0810f119 (patch)
tree79e90bf5709b0b33592c912a281294b15e04d535 /scripts/Makefile.lib
parent8cd0e46d3f0ce730a5c7d1e9e75765b24b72013a (diff)
kbuild: define KBUILD_MODNAME even if multiple modules share objects
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-only.o bar-objs := foo-bar-common.o bar-only.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> Reviewed-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Diffstat (limited to 'scripts/Makefile.lib')
1 files changed, 5 insertions, 7 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index ca5b587c9c42..5bdfb740047e 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -87,13 +87,9 @@ subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
# These flags are needed for modversions and compiling, so we define them here
# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
# end up in (or would, if it gets compiled in)
-# Note: Files that end up in two or more modules are compiled without the
-# KBUILD_MODNAME definition. The reason is that any made-up name would
-# 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 +170,10 @@ 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: