diff options
| -rw-r--r-- | Makefile | 81 | ||||
| -rw-r--r-- | scripts/Makefile.build | 45 |
2 files changed, 89 insertions, 37 deletions
@@ -230,6 +230,8 @@ endif export KBUILD_CHECKSRC KBUILD_EXTMOD +extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) + ifeq ($(abs_srctree),$(abs_objtree)) # building in the source tree srctree := . @@ -271,11 +273,13 @@ no-dot-config-targets := $(clean-targets) \ %asm-generic kernelversion %src-pkg no-sync-config-targets := $(no-dot-config-targets) install %install \ kernelrelease +single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ config-build := mixed-build := need-config := 1 may-sync-config := 1 +single-build := ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) @@ -302,6 +306,14 @@ ifeq ($(KBUILD_EXTMOD),) endif endif +# We cannot build single targets and the others at the same time +ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) + single-build := 1 + ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) + mixed-build := 1 + endif +endif + # For "make -j clean all", "make -j mrproper defconfig all", etc. ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) @@ -1003,7 +1015,7 @@ endif PHONY += prepare0 -export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order +export MODORDER := $(extmod-prefix)modules.order ifeq ($(KBUILD_EXTMOD),) core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ @@ -1655,7 +1667,7 @@ endif # KBUILD_EXTMOD PHONY += descend $(build-dirs) descend: $(build-dirs) $(build-dirs): prepare - $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 + $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1 clean-dirs := $(addprefix _clean_, $(clean-dirs)) PHONY += $(clean-dirs) clean @@ -1752,40 +1764,47 @@ tools/%: FORCE # Single targets # --------------------------------------------------------------------------- -# Single targets are compatible with: -# - build with mixed source and output -# - build with separate output dir 'make O=...' -# - external modules +# To build individual files in subdirectories, you can do like this: +# +# make foo/bar/baz.s # -# target-dir => where to store outputfile -# build-dir => directory in kernel source tree to use - -build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ -build-dir = $(patsubst %/,%,$(dir $(build-target))) - -%.i: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) -%.ll: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) -%.lst: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) -%.o: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) -%.s: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) -%.symtypes: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) +# The supported suffixes for single-target are listed in 'single-targets' +# +# To build only under specific subdirectories, you can do like this: +# +# make foo/bar/baz/ + +ifdef single-build + +single-all := $(filter $(single-targets), $(MAKECMDGOALS)) + +# .ko is special because modpost is needed +single-ko := $(sort $(filter %.ko, $(single-all))) +single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all))) + +$(single-ko): single_modpost + @: +$(single-no-ko): descend + @: + ifeq ($(KBUILD_EXTMOD),) -# For the single build of an in-tree module, use a temporary file to avoid +# For the single build of in-tree modules, use a temporary file to avoid # the situation of modules_install installing an invalid modules.order. -%.ko: MODORDER := .modules.tmp +MODORDER := .modules.tmp endif -%.ko: prepare FORCE - $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod) - $(Q)echo $(build-target) > $(MODORDER) + +PHONY += single_modpost +single_modpost: $(single-no-ko) + $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost -%/: prepare FORCE - $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1 + +KBUILD_MODULES := 1 + +export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) + +single-build = $(if $(filter-out $@/, $(single-no-ko)),1) + +endif # FIXME Should go into a make.lib or something # =========================================================================== diff --git a/scripts/Makefile.build b/scripts/Makefile.build index f84ccca8d74f..10adf3b558de 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -52,7 +52,7 @@ ifndef obj $(warning kbuild: Makefile.build is included improperly) endif -ifeq ($(MAKECMDGOALS)$(need-modorder),) +ifeq ($(need-modorder),) ifneq ($(obj-m),) $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) @@ -76,11 +76,6 @@ endif mod-targets := $(patsubst %.o, %.mod, $(obj-m)) -__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ - $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \ - $(subdir-ym) $(always) - @: - # Linus' kernel sanity checking tool ifeq ($(KBUILD_CHECKSRC),1) quiet_cmd_checksrc = CHECK $< @@ -487,12 +482,50 @@ targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ $(call intermediate_targets, .lex.o, .lex.c) \ $(call intermediate_targets, .tab.o, .tab.c .tab.h) +# Build +# --------------------------------------------------------------------------- + +ifdef single-build + +curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ + $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) + +# Handle single targets without any rule: show "Nothing to be done for ..." or +# "No rule to make target ..." depending on whether the target exists. +unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ + $(filter $(obj)/%, \ + $(filter-out $(curdir-single), \ + $(KBUILD_SINGLE_TARGETS)))) + +__build: $(curdir-single) $(subdir-ym) +ifneq ($(unknown-single),) + $(Q)$(MAKE) -f /dev/null $(unknown-single) +endif + @: + +ifeq ($(curdir-single),) +# Nothing to do in this directory. Do not include any .*.cmd file for speed-up +targets := +else +targets += $(curdir-single) +endif + +else + +__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ + $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \ + $(subdir-ym) $(always) + @: + +endif + # Descending # --------------------------------------------------------------------------- PHONY += $(subdir-ym) $(subdir-ym): $(Q)$(MAKE) $(build)=$@ \ + $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \ need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \ need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1)) |