Re: [Qemu-devel] [PULL 4/4] Makefile: Reuse all's recursion machinery for clean and install

[Christian Borntraeger <borntraeger@de.ibm.com>]

This seems to break "make clean" and "make distclean" in the source directory if there was never
a configure.

qemu]$ make clean
  LD      recurse-clean.mo
cc: fatal error: no input files
compilation terminated.
make: *** [rules.mak:118: recurse-clean.mo] Error 1



On 02.07.19 13:34, Markus Armbruster wrote:
> Targets "clean" and "install" run make recursively in a for loop.
> This ignores -j and -k.  Target "all" depends on SUBDIR/all to recurse
> into each SUBDIR.  Behaves nicely with -j and -k.  Put that to use for
> "clean" and "install": depend on SUBDIR/clean or SUBDIR/install,
> respectively, and delete the loop.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Message-Id: <20190528082308.22032-5-armbru@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  Makefile | 53 +++++++++++++++++++++++++----------------------------
>  1 file changed, 25 insertions(+), 28 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index e68982bd99..8cf6cbc4c4 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -454,20 +454,22 @@ config-host.h-timestamp: config-host.mak
>  qemu-options.def: $(SRC_PATH)/qemu-options.hx $(SRC_PATH)/scripts/hxtool
>  	$(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -h < $< > $@,"GEN","$@")
>  
> -SUBDIR_RULES=$(addsuffix /all, $(TARGET_DIRS))
> -SOFTMMU_SUBDIR_RULES=$(filter %-softmmu/all,$(SUBDIR_RULES))
> +TARGET_DIRS_RULES := $(foreach t, all clean install, $(addsuffix /$(t), $(TARGET_DIRS)))
>  
> -$(SOFTMMU_SUBDIR_RULES): $(authz-obj-y)
> -$(SOFTMMU_SUBDIR_RULES): $(block-obj-y)
> -$(SOFTMMU_SUBDIR_RULES): $(chardev-obj-y)
> -$(SOFTMMU_SUBDIR_RULES): $(crypto-obj-y)
> -$(SOFTMMU_SUBDIR_RULES): $(io-obj-y)
> -$(SOFTMMU_SUBDIR_RULES): config-all-devices.mak
> -$(SOFTMMU_SUBDIR_RULES): $(edk2-decompressed)
> +SOFTMMU_ALL_RULES=$(filter %-softmmu/all, $(TARGET_DIRS_RULES))
> +$(SOFTMMU_ALL_RULES): $(authz-obj-y)
> +$(SOFTMMU_ALL_RULES): $(block-obj-y)
> +$(SOFTMMU_ALL_RULES): $(chardev-obj-y)
> +$(SOFTMMU_ALL_RULES): $(crypto-obj-y)
> +$(SOFTMMU_ALL_RULES): $(io-obj-y)
> +$(SOFTMMU_ALL_RULES): config-all-devices.mak
> +$(SOFTMMU_ALL_RULES): $(edk2-decompressed)
>  
> -.PHONY: $(SUBDIR_RULES)
> -$(SUBDIR_RULES):
> -	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C $(dir $@) V="$(V)" TARGET_DIR="$(dir $@)" all,)
> +.PHONY: $(TARGET_DIRS_RULES)
> +# The $(TARGET_DIRS_RULES) are of the form SUBDIR/GOAL, so that
> +# $(dir $@) yields the sub-directory, and $(notdir $@) yields the sub-goal
> +$(TARGET_DIRS_RULES):
> +	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C $(dir $@) V="$(V)" TARGET_DIR="$(dir $@)" $(notdir $@),)
>  
>  DTC_MAKE_ARGS=-I$(SRC_PATH)/dtc VPATH=$(SRC_PATH)/dtc -C dtc V="$(V)" LIBFDT_srcdir=$(SRC_PATH)/dtc/libfdt
>  DTC_CFLAGS=$(CFLAGS) $(QEMU_CFLAGS)
> @@ -500,19 +502,19 @@ capstone/all: .git-submodule-status
>  slirp/all: .git-submodule-status
>  	$(call quiet-command,$(MAKE) -C $(SRC_PATH)/slirp BUILD_DIR="$(BUILD_DIR)/slirp" CC="$(CC)" AR="$(AR)" LD="$(LD)" RANLIB="$(RANLIB)" CFLAGS="$(QEMU_CFLAGS) $(CFLAGS)" LDFLAGS="$(LDFLAGS)")
>  
> -$(SUBDIR_RULES): libqemuutil.a $(common-obj-y) \
> +$(filter %/all, $(TARGET_DIRS_RULES)): libqemuutil.a $(common-obj-y) \
>  	$(qom-obj-y) $(crypto-user-obj-$(CONFIG_USER_ONLY))
>  
>  ROM_DIRS = $(addprefix pc-bios/, $(ROMS))
> -ROMSUBDIR_RULES=$(addsuffix /all, $(ROM_DIRS))
> +ROM_DIRS_RULES=$(foreach t, all clean, $(addsuffix /$(t), $(ROM_DIRS)))
>  # Only keep -O and -g cflags
> -.PHONY: $(ROMSUBDIR_RULES)
> -$(ROMSUBDIR_RULES):
> -	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C $(dir $@) V="$(V)" TARGET_DIR="$(dir $@)" CFLAGS="$(filter -O% -g%,$(CFLAGS))",)
> +.PHONY: $(ROM_DIRS_RULES)
> +$(ROM_DIRS_RULES):
> +	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C $(dir $@) V="$(V)" TARGET_DIR="$(dir $@)" CFLAGS="$(filter -O% -g%,$(CFLAGS))" $(notdir $@),)
>  
> -ALL_SUBDIRS=$(TARGET_DIRS) $(ROM_DIRS)
> -
> -recurse-all: $(SUBDIR_RULES) $(ROMSUBDIR_RULES)
> +recurse-all: $(addsuffix /all, $(TARGET_DIRS) $(ROM_DIRS))
> +recurse-clean: $(addsuffix /clean, $(TARGET_DIRS) $(ROM_DIRS))
> +recurse-install: $(addsuffix /install, $(TARGET_DIRS))
>  
>  $(BUILD_DIR)/version.o: $(SRC_PATH)/version.rc config-host.h
>  	$(call quiet-command,$(WINDRES) -I$(BUILD_DIR) -o $@ $<,"RC","version.o")
> @@ -661,7 +663,7 @@ clean-coverage:
>  		"CLEAN", "coverage files")
>  endif
>  
> -clean:
> +clean: recurse-clean
>  # avoid old build problems by removing potentially incorrect old files
>  	rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
>  	rm -f qemu-options.def
> @@ -682,9 +684,6 @@ clean:
>  	rm -f $(foreach f,$(generated-files-y),$(f) $(f)-timestamp)
>  	rm -f qapi-gen-timestamp
>  	rm -rf qga/qapi-generated
> -	for d in $(ALL_SUBDIRS); do \
> -	if test -d $$d; then $(MAKE) -C $$d $@ || exit 1; fi; \
> -        done
>  	rm -f config-all-devices.mak
>  
>  VERSION ?= $(shell cat VERSION)
> @@ -832,7 +831,8 @@ endif
>  ICON_SIZES=16x16 24x24 32x32 48x48 64x64 128x128 256x256 512x512
>  
>  install: all $(if $(BUILD_DOCS),install-doc) install-datadir install-localstatedir \
> -	$(if $(INSTALL_BLOBS),$(edk2-decompressed))
> +	$(if $(INSTALL_BLOBS),$(edk2-decompressed)) \
> +	recurse-install
>  ifneq ($(TOOLS),)
>  	$(call install-prog,$(subst qemu-ga,qemu-ga$(EXESUF),$(TOOLS)),$(DESTDIR)$(bindir))
>  endif
> @@ -898,9 +898,6 @@ endif
>  		$(INSTALL_DATA) $(SRC_PATH)/pc-bios/keymaps/$$x "$(DESTDIR)$(qemu_datadir)/keymaps"; \
>  	done
>  	$(INSTALL_DATA) $(BUILD_DIR)/trace-events-all "$(DESTDIR)$(qemu_datadir)/trace-events-all"
> -	for d in $(TARGET_DIRS); do \
> -	$(MAKE) $(SUBDIR_MAKEFLAGS) TARGET_DIR=$$d/ -C $$d $@ || exit 1 ; \
> -        done
>  
>  .PHONY: ctags
>  ctags:
>