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authorMasahiro Yamada <masahiroy@kernel.org>2019-12-19 01:04:28 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2020-01-07 02:18:38 +0900
commit56d5893615727bce4a8769c6b22340e20f9a3c33 (patch)
tree83fbc8a94b2bdbdc7c1c873454db396cbea3f90f
parentkbuild: rename header-test- to no-header-test in usr/include/Makefile (diff)
downloadlinux-dev-56d5893615727bce4a8769c6b22340e20f9a3c33.tar.xz
linux-dev-56d5893615727bce4a8769c6b22340e20f9a3c33.zip
kbuild: do not create orphan built-in.a or obj-y objects
Both 'obj-y += foo/' and 'obj-m += foo/' request Kbuild to visit the sub-directory foo/, but the difference is that only the former combines foo/built-in.a into the built-in.a of the current directory because everything in sub-directories visited by obj-m is supposed to be modular. So, it makes sense to create built-in.a only if that sub-directory is reachable by the chain of obj-y. Otherwise, built-in.a will not be linked into vmlinux anyway. For the same reason, it is pointless to compile obj-y objects in the directory visited by obj-m. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
-rw-r--r--scripts/Makefile.build2
-rw-r--r--scripts/Makefile.lib4
2 files changed, 5 insertions, 1 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index b734ac8a654e..e46b4ee9a120 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -66,7 +66,7 @@ lib-target := $(obj)/lib.a
real-obj-y += $(obj)/lib-ksyms.o
endif
-ifneq ($(strip $(real-obj-y) $(need-builtin)),)
+ifdef need-builtin
builtin-target := $(obj)/built-in.a
endif
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 3fa32f83b2d7..724aa3e9b4a8 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -35,7 +35,11 @@ __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
subdir-y += $(__subdir-y)
__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
subdir-m += $(__subdir-m)
+ifdef need-builtin
obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
+else
+obj-y := $(filter-out %/, $(obj-y))
+endif
obj-m := $(filter-out %/, $(obj-m))
# Subdirectories we need to descend into