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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-07 19:31:46 +0300 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-18 05:38:58 +0300 |
| commit | f7adc3124da019878186f1ebe98a13a1af041afd (patch) | |
| tree | 5519de53ba24c13fd6591efb49b861756178238c /scripts | |
| parent | 16f8259ca77d04f95e5ca90be1b1894ed45816c0 (diff) | |
| download | linux-f7adc3124da019878186f1ebe98a13a1af041afd.tar.xz | |
kbuild: create built-in.o automatically if parent directory wants it
"obj-y += foo/" syntax requires Kbuild to visit the "foo" subdirectory
and link built-in.o from that directory. This means foo/Makefile is
responsible for creating built-in.o even if there is no object to
link (in this case, built-in.o is an empty archive).
We have had several fixups like commit 4b024242e8a4 ("kbuild: Fix
linking error built-in.o no such file or directory"), then ended up
with a complex condition as follows:
ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
builtin-target := $(obj)/built-in.o
endif
We still have more cases not covered by the above, so we need to add
obj- := dummy.o
in several places just for creating empty built-in.o.
A key point is, the parent Makefile knows whether built-in.o is needed
or not. If a subdirectory needs to create built-in.o, its parent can
tell the fact when descending.
If non-empty $(need-builtin) flag is passed from the parent, built-in.o
should be created. $(obj-y) should be still checked to support the
single target "%/". All of ugly tricks will go away.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Makefile.build | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index f171225383cc..fc7f312bc0a7 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -76,7 +76,7 @@ lib-target := $(obj)/lib.a obj-y += $(obj)/lib-ksyms.o endif -ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) +ifneq ($(strip $(obj-y) $(need-builtin)),) builtin-target := $(obj)/built-in.o endif @@ -561,7 +561,7 @@ targets := $(filter-out $(PHONY), $(targets)) PHONY += $(subdir-ym) $(subdir-ym): - $(Q)$(MAKE) $(build)=$@ + $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) # Add FORCE to the prequisites of a target to force it to be always rebuilt. # --------------------------------------------------------------------------- |