#
#   Copyright (c) 2000, 2001, 2007	Dmitry Butskoy
#					<buc@citadel.stu.neva.ru>
#   License:  GPL v2 or any later
#
#   See COPYING for the status of this software.
#

#
#   Common rule and variable definitions.
#   This file should be included by main and by per-target Makefiles.
#


ifndef srcdir
$(error srcdir variable not defined)
endif


MAKE = make --no-print-directory -r


#  Use env=yes on cmdline to inherit environment values

ifeq ($(env),yes)
define set
$(eval ifneq ($$(origin $(1)),environment)
$(1) = $(2)
else
override MAKE := $(1)="$($(strip $(1)))" $(MAKE)
endif)
endef
else
set = $(eval $(1) = $(2))
endif


$(call set, CROSS, )
$(call set, CC, $$(CROSS)gcc)
$(call set, AS, $$(CROSS)as)
$(call set, LD, $$(CROSS)ld)
$(call set, DEPEND, $$(CROSS)gcc -MM -MG)
$(call set, AR, $$(CROSS)ar)
$(call set, RANLIB, $$(CROSS)ranlib)
$(call set, INSTALL, cp)
$(call set, INDENT, true)

gcc = $(findstring gcc,$(CC))
$(call set, CFLAGS, $(if $(gcc), -O2 -Wall, -O))
$(call set, CPPFLAGS, )
$(call set, LDFLAGS, -s)
$(call set, LIBS, )


#  install stuff
prefix = /usr/local

ifneq ($(wildcard /lib64/libc.* /usr/lib64/libc.*),)
lib := lib64
else
lib := lib
endif

exec_prefix = $(prefix)
bindir = $(exec_prefix)/bin
sbindir = $(exec_prefix)/sbin
libdir = $(exec_prefix)/$(lib)
libexecdir = $(exec_prefix)/libexec/$(NAME)
sysconfdir = $(prefix)/etc
includedir = $(prefix)/include
datadir = $(prefix)/share
mandir = $(datadir)/man
infodir = $(datadir)/info
localstatedir = $(prefix)/var
sharedstatedir = $(prefix)/com

DESTDIR =


#  layout stuff
SKIPDIRS = tmp%
INCLUDEDIRS = include%
LIBDIRS = lib%
MODDIRS = mod%
SKIPINSTALL = test%


include $(srcdir)/Make.defines


ifndef NAME
NAME = $(notdir $(srcdir))
endif


ifndef subdirs
ifeq ($(TARGET),.MAIN)
# for better performance...
subdirs := $(patsubst %/,%,$(wildcard */))
else
subdirs := $(patsubst $(srcdir)/%/,%,$(filter %/,$(wildcard $(srcdir)/*/)))
endif
subdirs := $(filter-out $(SKIPDIRS), $(subdirs))
endif

install install-%: subdirs := $(filter-out $(SKIPINSTALL), $(subdirs))


override MAKE += srcdir=$(srcdir) subdirs="$(subdirs)" shared=$(shared)


INCLUDEDIRS := $(filter $(INCLUDEDIRS), $(subdirs))
LIBDIRS := $(filter $(LIBDIRS), $(subdirs))
MODDIRS := $(filter $(MODDIRS), $(subdirs))
EXEDIRS := $(filter-out $(INCLUDEDIRS) $(LIBDIRS) $(MODDIRS), $(subdirs))
MODUSERS := $(filter $(MODUSERS), $(subdirs))
SBINUSERS := $(filter $(SBINUSERS), $(subdirs))

LIBDIRS := $(filter-out $(LIBLAST),$(LIBDIRS)) $(filter $(LIBDIRS),$(LIBLAST))


includes = $(foreach dir, $(INCLUDEDIRS) $(LIBDIRS), $(srcdir)/$(dir))

ifneq ($(gcc),)
CPATH = $(subst $(empty) ,:,$(includes))
export CPATH
else
override CPPFLAGS += $(patsubst %,-I%,$(includes))
endif

libraries = $(foreach dir, $(filter lib%,$(LIBDIRS)), $(srcdir)/$(dir))

vpath lib%.so $(libraries)
vpath lib%.a $(libraries)

_libs = $(strip $(foreach _lib,$(LIBDIRS),\
		    $(if $(filter lib%,$(_lib)),\
			$(patsubst lib%,-l%,$(_lib)),\
			$(wildcard $(srcdir)/$(_lib)/$(_lib).so \
					$(srcdir)/$(_lib)/$(_lib).a))))

override LIBS := $(_libs) -lm $(LIBS)

ifeq ($(CC),gcc)
LIBRARY_PATH = $(subst $(empty) ,:,$(libraries))
export LIBRARY_PATH
else
override LIBS += $(patsubst %,-L%,$(libraries))
endif

LIBDEPS = $(filter-out -L%,$(LIBS))


#
#	SUBDIRS	    STUFF
#

ifneq ($(TARGET),.MAIN)

obj := o
ifeq ($(shared),yes)
ifneq ($(PIC),no)
ifeq ($(filter $(TARGET),$(LIBDIRS) $(MODDIRS) .MODULE),$(TARGET))
obj := lo
endif
endif
endif

sources = $(wildcard *.c)
OBJS = $(sources:.c=.$(obj))


.PHONY: dummy all depend install clean force

dummy: all


clean:
	rm -f *.o *.a *.lo *.so $(TARGET) core a.out


ifneq ($(sources),)
depend: $(sources)
	$(DEPEND) $(CFLAGS) $(CPPFLAGS) $^ >.depend
else
depend:
	@true
endif


%.o: %.c
	$(CC) $(CFLAGS) $(CPPFLAGS) -c $*.c

%.lo: %.c
	$(CC) -fPIC $(CFLAGS) $(CPPFLAGS) -o $*.lo -c $*.c

%.o: %.s
	$(AS) -o $*.o $*.s

%.o: %.S
	$(CC) -traditional $(CPPFLAGS) -c $*.S

# include if it is present only...
ifeq (.depend, $(wildcard .depend))
include .depend
endif

endif

#
#  ...end of SUBDIRS STUFF
#