### The build commands and verbosity

# If we are verbose, we will show commands prefixed by $(Q) (which acts as
# @ in the non-verbose mode), and we will show the "real" cmds instead of
# their quiet versions (which are used in the non-verbose mode).
# Inspired by the Linux kernel build system.
ifdef V
	Q =
	quiet =
	mquiet = masq_
else
	Q = @
	quiet = quiet_
	mquiet = quiet_
endif

# Colorize the build.
ifdef MAKE_COLOR
	INFO_COLOR    = $(shell tput setaf 5)
	CC_COLOR      = $(shell tput setaf 6)
	LD_COLOR      = $(shell tput setaf 2)
	PO_COLOR      = $(shell tput setaf 6)
	LINK_COLOR    = $(shell tput bold;tput setaf 4)
	INSTALL_COLOR = $(shell tput setaf 3)
	END_COLOR     = $(shell tput sgr0)
endif

# Show the command (quiet or non-quiet version based on the assignment
# just above) and then execute it.
ncmd = $(if $($(quiet)cmd_$(1)),echo $($(quiet)cmd_$(1)) &&) $(cmd_$(1))
cmd = @$(if $($(quiet)cmd_$(1)),echo $($(quiet)cmd_$(1)) &&) $(cmd_$(1))
mcmd = @$(if $($(mquiet)cmd_$(1)),echo $($(mquiet)cmd_$(1)) &&) $(cmd_$(1))
ecmd = @$(if $($(mquiet)cmd_$(1)),printf "%-38s " $($(mquiet)cmd_$(1)) &&) $(cmd_$(1))

quiet_cmd_compile = '      [$(CC_COLOR)CC$(END_COLOR)]   $(RELPATH)$@'
 masq_cmd_compile = $(COMPILE) -c $<
      cmd_compile = $(COMPILE) -Wp,-MD,.deps/$(*F).pp -c $<

# Rule to compile a set of .o files into one .o file
quiet_cmd_ld_objs = "      [$(LD_COLOR)LD$(END_COLOR)]   $(RELPATH)$@"
      cmd_ld_objs = $(LD) -r -o $@ $(filter $(OBJS), $^) \
      		    $(foreach subdir,$(sort $(filter-out src,$(SUBDIRS))), \
			    `test -e $(subdir)/lib.o && echo $(subdir)/lib.o`)

   quiet_cmd_link = '    [$(LINK_COLOR)LINK$(END_COLOR)]   $(RELPATH)$@'
         cmd_link = $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)

 quiet_cmd_sparse = '    [SPARSE]   $(RELPATH)$(2)'
       cmd_sparse = $(SPARSE) $(DEFS) $(INCLUDES) $(AM_CFLAGS) $(CFLAGS) $(SPARSE_FLAGS) $(2)

# Recursive make
quiet_cmd_recmake = "[$(INFO_COLOR)MAKE $(3)$(END_COLOR)]   $(RELPATH)$(2)"
      cmd_recmake = $(MAKE) -C $(2) $(3)

quiet_cmd_installdata = "     [$(INSTALL_COLOR)INSTALL$(END_COLOR)]   $(RELPATH)$(2) -> $(3)"
      cmd_installdata = $(INSTALL_DATA) $(2) $(3)

quiet_cmd_installprog = "     [$(INSTALL_COLOR)INSTALL$(END_COLOR)]   $(RELPATH)$(2) -> $(3)"
      cmd_installprog = $(INSTALL_PROGRAM) $(2) $(3)


### Internal build rules

DEP_FILES_1 = $(foreach src,$(OBJS),.deps/$(src))
DEP_FILES = $(DEP_FILES_1:%.o=%.P)

DEPS_MAGIC := $(shell mkdir .deps > /dev/null 2>&1 || :)

ifdef OBJS
-include $(DEP_FILES)
endif

%.o: $(srcdir)%.c
	$(call mcmd,compile)
	@-cp .deps/$(*F).pp .deps/$(*F).P; \
		tr ' ' '\012' < .deps/$(*F).pp \
			| sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
			>> .deps/$(*F).P; \
		rm .deps/$(*F).pp

ifdef SUBDIRS-yes
SUBDIRS += $(SUBDIRS-yes)
endif

ifdef OBJS-yes
OBJS += $(OBJS-yes)
endif

ifneq ($(findstring cleanall,$(MAKECMDGOALS)),)
INCLUDE_ALL=1
endif

ifneq ($(findstring init,$(MAKECMDGOALS)),)
# FIXME: Detect when $(subdir)/Makefile is $(srcdir)/$(subdir)/Makefile
# and error out so the user won't overwrite the 'master' Makefiles.
INCLUDE_ALL=1
endif

ifdef INCLUDE_ALL
ifdef SUBDIRS-no
SUBDIRS += $(SUBDIRS-no)
endif
ifdef SUBDIRS-
SUBDIRS += $(SUBDIRS-)
endif
ifdef OBJS-no
OBJS += $(OBJS-no)
endif
ifdef OBJS-
OBJS += $(OBJS-)
endif

endif


ifdef OBJS
lib.o: $(sort $(OBJS)) $(foreach subdir,$(sort $(filter-out src,$(SUBDIRS))), $(wildcard $(subdir)/lib.o))
	$(call cmd,ld_objs)

LIB_O = lib.o
CLEAN += $(OBJS) $(LIB_O)
endif

CLEAN += $(PROG)

all-default: $(LIB_O) $(PROGS) $(MAN1) $(MAN5)

# Ensure that Makefiles in subdirs are created before we recursive into them
init-recursive: init-default

init-default:
	@$(foreach subdir,$(sort $(SUBDIRS)), \
		$(MKINSTALLDIRS) $(subdir) >/dev/null; \
		echo 'include $(SRC)/$(RELPATH)/$(subdir)/Makefile' > $(subdir)/Makefile;)

clean-default: clean-test
	@-test -z "$(CLEAN)" || $(RM) $(CLEAN)

cleanall-default: clean-default

check-default:
ifneq ($(SPARSE),)
	@$(foreach file, $(wildcard *.c), \
		$(call ncmd,sparse,$(file));)
endif

##############################################################################
#
# Auto-testing infrastructure
#

clean-test:
test-default:

ifdef TEST_PROGS
TESTDEPS += $(TESTDEPS-yes)

$(TEST_PROGS): $(TESTDEPS) $$@.o
	$(call cmd,link)

TESTS = $(wildcard $(srcdir)test-*)

$(TESTS): $(TEST_PROGS)
	@echo "*** $(notdir $@) ***"; \
	$(call shellquote,$(SHELL)) $@ $(TEST_OPTS)

test-default: $(TESTS)

clean-test:
	@rm -fr trash

CLEAN += $(TEST_PROGS) $(addsuffix .o,$(TEST_PROGS))
endif

.PHONY: $(TESTS)
.NOPARALLEL:

# sparse is architecture-neutral, which means that we need to tell it
# explicitly what architecture to check for. Fix this up for yours..
SPARSE_FLAGS = -D__BIG_ENDIAN__ -D__powerpc__
install-default: all-default
ifdef PROGS
	@$(MKINSTALLDIRS) $(DESTDIR)$(bindir)
	@$(foreach file,$(PROGS), \
		$(call ncmd,installprog,$(file),$(DESTDIR)$(bindir));)
endif
ifdef MAN1
	@$(MKINSTALLDIRS) $(DESTDIR)$(mandir)/man1
	@$(foreach file,$(MAN1), \
		$(call ncmd,installdata,$(file),$(DESTDIR)$(mandir)/man1);)
endif
ifdef MAN5
	@$(MKINSTALLDIRS) $(DESTDIR)$(mandir)/man5
	@$(foreach file,$(MAN5), \
		$(call ncmd,installdata,$(file),$(DESTDIR)$(mandir)/man5);)
endif

# Recursion:

RULES	 = all install clean cleanall init check test
RECRULES = $(addsuffix -recursive,$(RULES))

.PHONY: $(RECRULES)

# The -recursive rules decend all subdirs.
$(RECRULES):
ifdef SUBDIRS
	@$(foreach subdir,$(sort $(SUBDIRS)), \
		$(call ncmd,recmake,$(subdir),$(subst -recursive,,$@)) || exit 1;)
endif

# Setup the default sub commands dependency. First decend subdirs then do all
# the default stuff and finally do any local hooks.
$(RULES): $$@-recursive $$@-default $$@-local

# Dummy rules for local hooks
$(addsuffix -local,$(RULES)):

# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

# Shell quote;
# Result of this needs to be placed inside ''
# XXX: Placed here because Vim cannot highlight things right afterwards
shq = $(subst ','\'',$(1))
# This has surrounding ''
shellquote = '$(call shq,$(1))'

# vim:syntax=make