source: rtems/c/src/automake/subdirs.am @ af6168c6

## Copyright 2017 Chris Johns <chrisj@rtems.org>

##
## The following builds in parallel. The subdirectories are
## expanded into separate rules and all the targets are listed
## and make runs as many as it can.
##
## A macro is defined and evaluated once for each directory. This
## creates the instance of the rule. Use $(info ...) to print them.
##

SUBDIRS_dot                            = $(filter     .,$(_SUBDIRS))
SUBDIRS_no_dot                         = $(filter-out .,$(_SUBDIRS))
SUBDIRS_no_dot_no_wrapup               = $(filter-out wrapup,$(SUBDIRS_no_dot))
SUBDIRS_no_dot_no_testsuites           = $(filter-out testsuites,$(SUBDIRS_no_dot))
SUBDIRS_no_dot_no_wrapup_no_testsuites = $(filter-out testsuites,$(SUBDIRS_no_dot_no_wrapup))
SUBDIRS_wrapup                         = $(filter     wrapup,$(SUBDIRS_no_dot))
SUBDIRS_testsuites                     = $(filter     testsuites,$(SUBDIRS_no_dot))

define CPUKITDIR
.PHONY: $1
$1:
        @+set fnord $(MAKEFLAGS); amf=$$$$2; \
        subdir=$(2); \
        target=`echo $(MAKECMDGOALS) | sed s/-recursive//`; \
        if test "$$$$target" = "all-local-am"; then \
          target="all-am"; \
        fi; \
        if test "$$$$target" = "all-local"; then \
          target="all"; \
        fi; \
        echo "Making $$$$target in $$$$subdir"; \
        if test "$$$$subdir" != "."; then \
          cd $$$$subdir; \
          $(MAKE) $(AM_MAKEFLAGS) $$$$target; \
        fi;
endef

#
# This GNU make syntax is being used to stop automake thinking the code is for
# it.
#
$(if "$(SUBDIRS_dot)" ".",$(eval $(call CPUKITDIR,dot,.)))

$(foreach D,$(SUBDIRS_no_dot),$(eval $(call CPUKITDIR,$(D),$(D))))

#
# If there is a wrapup make it depend on all other directories except the
# testsuite so it is not entered until everything but the testsuite has
# finished.
#
$(if "$(SUBDIRS_wrapup)" "wrapup",wrapup: dot $(SUBDIRS_no_dot_no_wrapup_no_testsuites))

#
# If there is a testsuite make it depend on all other directories so it is not
# entered until everything else has finished.
#
$(if "$(SUBDIRS_testsuites)" "testsuites",testsuites: dot $(SUBDIRS_no_dot_no_testsuites))

#
# The general build all rule for automake.
#
all-local:   $(if "$(SUBDIRS_dot)" ".",dot) $(SUBDIRS_no_dot)
clean-local: $(if "$(SUBDIRS_dot)" ".",dot) $(SUBDIRS_no_dot)