### 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

CURPATH = $(shell pwd)
TOPPATH = $(shell cd $(path_to_top) && pwd)
RELPATH = $(shell echo '$(CURPATH)' | sed 's,$(TOPPATH),,;s,^/,,;s,\([a-z0-9]\)$$,\1/,')

# 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))

quiet_cmd_compile = '      [CC]   $(RELPATH)$<'
 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]   $(RELPATH)$@"
      cmd_ld_objs = $(LD) -r -o $@ $(filter $(OBJS), $^)
 
   quiet_cmd_link = '    [LINK]   $(RELPATH)$@'
         cmd_link = $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)

# Recursive make
quiet_cmd_recmake = "[MAKE $$target]   $(RELPATH)$$subdir"
      cmd_recmake = $(MAKE) -C $$subdir $$target

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

quiet_cmd_installprog = "     [INSTALL]   $(RELPATH)$(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: %.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

ifdef SUBDIRS
# Apparently wildcard won't expand *.o files so check if there are any *.c
# files and use that to magically add the lib.o file of the subdirectory.
subobjs := $(strip $(foreach subdir,$(sort $(filter-out src,$(SUBDIRS))), \
		$(if $(wildcard $(subdir)/*.c),$(subdir)/lib.o)))
endif
ifneq ($(subobjs),)
OBJS += $(subobjs)
endif

ifdef OBJS
lib.o: $(sort $(OBJS))
	$(call cmd,ld_objs)

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

CLEAN += $(PROG)

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

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

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:

.PHONY: all-recursive install-recursive clean-recursive
all-recursive install-recursive clean-recursive:
ifdef SUBDIRS
	@target=`echo $@ | sed s/-recursive//`; \
	for subdir in $(sort $(SUBDIRS)); do \
		$(call ncmd,recmake) || exit 1; \
	done
endif

all: all-recursive all-default all-local
install: install-recursive install-default install-local
clean: clean-recursive clean-default clean-local

all-local:
install-local:
clean-local:

# 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:

# vim:syntax=make