[LTP] [PATCH v3 3/3] build: Parallelize subdirectory recursion in generic_trunk_target

[Li Wang]

>  ifdef VERBOSE
> -	@set -e; for dir in $(SUBDIRS); do \
> -	    $(MAKE) -C $$dir -f "$(abs_srcdir)/$$dir/Makefile" $@; \
> -	done
> +	$(MAKE) -C "$(patsubst %-all,%,$@)" -f "$(abs_srcdir)/$(patsubst %-all,%,$@)/Makefile" all
>  else
> -	@set -e; for dir in $(SUBDIRS); do \
> -	    $(MAKE) --no-print-directory -C $$dir -f "$(abs_srcdir)/$$dir/Makefile" $@; \
> -	done
> +	@$(MAKE) --no-print-directory -C "$(patsubst %-all,%,$@)" -f "$(abs_srcdir)/$(patsubst %-all,%,$@)/Makefile" all
> +endif
> +
> +$(addsuffix -install,$(SUBDIRS)): trunk-install | $(SUBDIRS) $(MAKE_DEPS)
> +ifdef VERBOSE
> +	$(MAKE) -C "$(patsubst %-install,%,$@)" -f "$(abs_srcdir)/$(patsubst %-install,%,$@)/Makefile" install
> +else
> +	@$(MAKE) --no-print-directory -C "$(patsubst %-install,%,$@)" -f "$(abs_srcdir)/$(patsubst %-install,%,$@)/Makefile" install
> +endif
> +
> +$(addsuffix -check,$(SUBDIRS)): trunk-check | $(SUBDIRS) $(MAKE_DEPS)
> +ifdef VERBOSE
> +	$(MAKE) -C "$(patsubst %-check,%,$@)" -f "$(abs_srcdir)/$(patsubst %-check,%,$@)/Makefile" check
> +else
> +	@$(MAKE) --no-print-directory -C "$(patsubst %-check,%,$@)" -f "$(abs_srcdir)/$(patsubst %-check,%,$@)/Makefile" check
>  endif

Maybe we could refactor those lines to something like this:

ifdef VERBOSE
Q :=
SUBMAKE := $(MAKE)
else
Q := @
SUBMAKE := $(MAKE) --no-print-directory
endif

all:     $(addsuffix -all,$(SUBDIRS))
install: $(addsuffix -install,$(SUBDIRS))
check:   $(addsuffix -check,$(SUBDIRS))

.PHONY: $(addsuffix -all,$(SUBDIRS)) $(addsuffix -install,$(SUBDIRS)) $(addsuffix -check,$(SUBDIRS))

$(addsuffix -all,$(SUBDIRS)): %-all: trunk-all | $(SUBDIRS) $(MAKE_DEPS)
	$(Q)$(SUBMAKE) -C "$*" -f "$(abs_srcdir)/$*/Makefile" all

$(addsuffix -install,$(SUBDIRS)): %-install: trunk-install | $(SUBDIRS) $(MAKE_DEPS)
	$(Q)$(SUBMAKE) -C "$*" -f "$(abs_srcdir)/$*/Makefile" install

$(addsuffix -check,$(SUBDIRS)): %-check: trunk-check | $(SUBDIRS) $(MAKE_DEPS)
	$(Q)$(SUBMAKE) -C "$*" -f "$(abs_srcdir)/$*/Makefile" check


-- 
Regards,
Li Wang