#
# Copyright (c) 2013-2014 Red Hat.
# Copyright (c) 2007 Aconex.  All Rights Reserved.
# Copyright (c) 2000,2003,2004 Silicon Graphics, Inc.  All Rights Reserved.
# 
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
# 
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.
#
# Common build rules for gmake
#
ifndef _BUILDRULES_INCLUDED_
_BUILDRULES_INCLUDED_ = 1

ifndef _BUILDDEFS_INCLUDED_
include $(TOPDIR)/src/include/builddefs
endif

#
# Standard targets
#
ifdef CMDTARGET
$(CMDTARGET) : $(SUBDIRS) $(OBJECTS)
	$(CCF) -o $(CMDTARGET) $(LDFLAGS) $(OBJECTS) $(LDLIBS)
endif
ifdef CXXMDTARGET
$(CXXMDTARGET) : $(SUBDIRS) $(OBJECTS)
	$(CXXF) -o $(CXXMDTARGET) $(LDFLAGS) $(OBJECTS) $(LDLIBS)
endif

# GNU make has a built-in recipe for .cc / .C / .cpp, but not for .cxx -> .o
.cxx.o:
	$(CXXF) $(CXXFLAGS) -c $< -o $@
.SUFFIXES: .cxx

ifdef LIBTARGET
ifneq (, $(filter linux freebsd kfreebsd netbsd openbsd mingw gnu, $(TARGET_OS)))
_SHAREDOPTS	= -shared -Wl,-soname,$(LIBTARGET)
endif
ifeq ($(TARGET_OS), solaris)
_SHAREDOPTS	= -shared -fpic
endif
ifeq ($(TARGET_OS), darwin)
# libtool doesnt understand -dynamiclib so we need both
_SHAREDOPTS	= -fPIC -dynamic -dynamiclib -flat_namespace -undefined suppress -headerpad_max_install_names
endif
ifeq ($(TARGET_OS), aix)
_SHAREDOPTS	= -qmkshrobj
endif

ifdef VERSION_SCRIPT
ifneq ($(INVISIBILITY),)
ifeq ($(TARGET_OS), darwin)
# Mac OS X ld(1) takes a different format for the symbols file
# EXPORTS	= $(VERSION_SCRIPT).darwin
# _SHAREDOPTS	+=  -Wl,-exported_symbols_list $(EXPORTS)
# LDIRT		+= $(EXPORTS)
else
ifeq ($(TARGET_OS), solaris)
EXPORTS		= $(VERSION_SCRIPT).solaris
_SHAREDOPTS	+= -Wl,-M $(EXPORTS)
LDIRT		+= $(EXPORTS)
else
EXPORTS		= $(VERSION_SCRIPT)
_SHAREDOPTS	+= -Wl,--version-script=$(EXPORTS)
endif
endif
endif
endif

ifneq ($(EXPORTS), $(VERSION_SCRIPT))
$(EXPORTS) : $(VERSION_SCRIPT)
	$(EXPORTS_MAKERULE)
endif

$(LIBTARGET) : $(SUBDIRS) $(OBJECTS) $(EXPORTS)
	$(CC) $(LDFLAGS) $(_SHAREDOPTS) -o $(LIBTARGET) $(OBJECTS) $(LDLIBS) $(LIB_FOR_DLOPEN) $(LIB_FOR_BASENAME)
endif

ifdef STATICLIBTARGET
$(STATICLIBTARGET) : $(SUBDIRS) $(OBJECTS)
ifeq ($(TARGET_OS), darwin)
	libtool -static -o $(STATICLIBTARGET) $?
else
	$(AR) cr $(STATICLIBTARGET) $?
endif
endif

ifdef WINDOWLINKS
windowlinks:
	@for l in $(WINDOWLINKS) ; do \
	    if [ ! -L $$l -a ! -f $$l ] ; then \
		$(LN_S) $(WINDOW)_$$l $$l ; \
	    fi \
	done
endif

# Suffix rule to support transition for YFILES to OBJECTS
%.tab.h : %.y
	$(YACC) -d -b `basename $< .y` $<

%.tab.c : %.y
	$(YACC) -d -b `basename $< .y` $<

# Dealing with quirks of the various packaging mechanisms
%.py: %.python
	rm -f $@
	$(LN_S) $< $@

%.pl: %.perl
	rm -f $@
	$(LN_S) $< $@

ifeq ($(TARGET_OS), mingw)
#
# .exe rule for Windows
#
.SUFFIXES:	.exe
.o.exe:
	$(CCF) -o $* $(LDFLAGS) $(OBJECTS) $(LDLIBS)
endif

check :: $(SUBDIRS)
ifdef SUBDIRS
	$(SUBDIRS_MAKERULE)
endif

clean clobber :: $(SUBDIRS) $(PRO_SUBDIRS) $(SNIA_SUBDIRS)
	rm -rf $(DIRT)
	@rm -fr $(DIRDIRT)
	$(SUBDIRS_MAKERULE)

realclean distclean: clean
	rm -f $(TOPDIR)/src/include/builddefs \
	      $(TOPDIR)/src/include/pcp.conf \
	      $(TOPDIR)/src/include/pcp/config.h \
	      $(TOPDIR)/src/include/pcp/configsz.h \
	      $(TOPDIR)/src/include/pcp/platform_defs.h \
	      $(TOPDIR)/src/libpcp/src/pmdbg.h
	rm -f $(TOPDIR)/build/GNUlocaldefs
	rm -f $(TOPDIR)/pcp.lsm

#
# Never blow away subdirs
#
ifdef SUBDIRS
.PRECIOUS: $(SUBDIRS)
endif

endif

$(_FORCE):

# The depend target does not depend on any other targets (even though it
# actually depends on CFILES and HFILES). This is because there are several
# places where we generate header files (e.g. domain.h is generated for each
# subdir below src/pmdas, and domain.h in turn depends on src/pmns/stdpmid,
# which itself a generated file ...). As a result, you can't run make
# depend after make clobber, because the generated files will be missing.
# 
# So running makedepend is for development use when you change a header
# somewhere and you need to be sure everything that depends on that header
# will be remade properly.

.PHONY : depend $(_FORCE)

depend : $(SUBDIRS)
	$(SUBDIRS_MAKERULE)
	touch dep
	$(MAKEDEPEND) -fdep -- $(CFLAGS) -- $(CFILES)

#
# include dep, but only if it exists
-include dep

# Support for building multiple versions of the same library
ifneq ($(PCP_ALTLIBS),)
$(PCP_ALTLIBS): 
	rm -rf $@
	mkdir $@
	cp GNUlocaldefs.$@ $@/GNUlocaldefs
	$(MAKE) -C src SLDEST=../$@ SLSRC=../src libsrc_symlinks
endif

libsrc_symlinks:
	test -n "$(SLDEST)" -a -d $(SLDEST)
	for f in $(SRCFILES); do \
	    if [ -e $(SLDEST)/$$f -a ! -L $(SLDEST)/$$f ] ; then \
		echo "$$f exists in $(SLDEST) and not a symlink"; exit 1; \
	    fi; \
	    rm -f $(SLDEST)/$$f; $(LN_S) $(SLSRC)/$$f $(SLDEST)/$$f || exit 1; \
	done