### The build commands and verbosity

# 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

# 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__


#############################################################################
# Build recipies

# If we are verbose, 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
	quiet =
	mquiet = masq_
else
	quiet = quiet_
	mquiet = quiet_
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) -o $(@) -c $< $(2)
      cmd_compile = $(COMPILE) -o $(@) -Wp,-MD,.deps/$(*F).pp -c $< $(2)

# 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_NAME) && echo $(subdir)/$(LIB_O_NAME)`)

   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)


#############################################################################
# Special handling of conditional variables

SUBDIRS += $(SUBDIRS-yes)
OBJS	+= $(OBJS-yes)

ALTDIRS  = $(SUBDIRS-no) $(SUBDIRS-)
ALTOBJS  = $(OBJS-no) $(OBJS-)

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

ifneq ($(findstring init,$(MAKECMDGOALS)),)
INCLUDE_ALL=1
ifndef SRC
SRC = $(shell cd $(top_srcdir) && pwd)
endif
endif

ifdef INCLUDE_ALL
SUBDIRS += $(ALTDIRS)
OBJS	+= $(ALTOBJS)
endif


#############################################################################
# Internal build rules

# All files in $(OBJS) and any $(subdir)/lib.o are linked into lib.o.
# Sort them to filter out duplicated and get uniform order.
LIB_O_DEPS = \
 $(sort $(filter-out $(LIB_O_NAME),$(OBJS))) \
 $(foreach subdir,$(sort $(SUBDIRS)),$(wildcard $(subdir)/$(LIB_O_NAME)))

$(LIB_O_NAME): $(LIB_O_DEPS)
	$(call cmd,ld_objs)

DEP_FILES_1 = $(foreach src,$(OBJS),.deps/$(src))
DEP_FILES = $(DEP_FILES_1:%.o=%.P)
DEPS_MAGIC := $(shell mkdir .deps > /dev/null 2>&1 || :)

ifneq ($(strip $(OBJS)),)
-include $(DEP_FILES)
OBJS += $(LIB_O_NAME)
endif

%.o: $(srcdir)%.c
	$(call mcmd,compile)
	@-if test -e .deps/$(*F).pp; then \
		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; \
	fi

CLEAN += $(PROG) $(OBJS)


#############################################################################
# The main default rules

all-default: $(OBJS) $(PROGS) $(MAN1) $(MAN5) .vimrc

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

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

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

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

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

.vimrc: $(top_srcdir)/Makefile.lib
	@{ echo ':set runtimepath+=.'; \
	   echo ':runtime $(top_srcdir)/config/vimrc'; \
	} > .vimrc

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

test-default:

ifdef TEST_PROGS
TESTDEPS-$(CONFIG_DEBUG) += $(top_builddir)/src/util/memdebug.o
TESTDEPS += $(TESTDEPS-yes)

define test_prog
$(1): $(1).o $(TESTDEPS)
	$$(call cmd,link)
endef

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))
clean-default: clean-test
endif

$(foreach prog,$(TEST_PROGS),$(eval $(call test_prog,$(prog))))

.PHONY: $(TESTS)
.NOPARALLEL:


#############################################################################
# Basic recursion and dependencies setup

RULES	 = all install clean cleanall init check test

RULES_LOCAL = $(addsuffix -local,$(RULES))
RULES_REC   = $(addsuffix -recursive,$(RULES))

.PHONY: $(RULES) $(RULES_LOCAL) $(RULES_REC) $(addsuffix -default,$(RULES))

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

# Dummy -local rules
$(RULES_LOCAL):

# Default deps
rule_deps = $(1)-recursive $(1)-default $(1)-local
all:	  $(call rule_deps,all)
install:  $(call rule_deps,install)
clean:	  $(call rule_deps,clean)
cleanall: $(call rule_deps,cleanall)
init:	  $(call rule_deps,init)
check:	  $(call rule_deps,check)
test:	  $(call rule_deps,test)

#############################################################################
# Misc

# 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