# $Id$
#
# common rules for compilation of sources files to preprocessed
# for compiled-in version and build date.
#
# this file is automatically included if BUILDDATESOURCES is set.
#
# Variables:
#
# srcdir    ... source directory.
# CXX       ... path of GNU C++ compiler
# CC        ... path of GNU C compiler
# BUILDDATESOURCES... list of source files to preprocess with __VERSION__, __BUILD_DATE__ and __SOURCE_SHA256__
# EXT_CFLAGS... pkg-config CFLAGS, determined by common-compile.mk
# INCLUDES  ... list of optional include directories
# CFLAGS    ... C options like -Wall -g -O2
# CXXFLAGS  ... C++ options like -Wall -g -O2
# VERSION   ... The version of the build artifact, determined by common-compile.mk
#               debian/changelog version must contain exactly 4 parts, i.e. 1.2.3.4 or 1.2.3-4
#

BUILD_DATE=$(shell date '+%Y-%m-%d %H:%M:%S%z')

BUILDDATESAH256INPUT=$(addprefix $(srcdir)/,$(BUILDDATESOURCES)) $(addprefix $(srcdir)/,$(SOURCES)) $(addprefix $(srcdir)/,$(HEADERS)) $(addprefix $(srcdir)/,$(UICFILES)) $(addprefix $(srcdir)/,$(YSOURCES))

BUILDDATETARGETSOURCES=$(join $(addsuffix _builddate,$(basename $(BUILDDATESOURCES))),$(suffix $(BUILDDATESOURCES)))
BUILDDATEOBJS=$(addsuffix _builddate.o,$(basename $(BUILDDATESOURCES)))

.SECONDARY=$(BUILDDATETARGETSOURCES)

OBJS:=$(OBJS) $(BUILDDATEOBJS)

# fake dependency in order to always force rebuild
builddate_foo:

source_hashes_builddate.sha256: $(BUILDDATESAH256INPUT)
	sha256sum $(BUILDDATESAH256INPUT) > $@

%_builddate.c: $(srcdir)/%.c source_hashes_builddate.sha256 builddate_foo
	sed -e 's/__VERSION__/$(VERSION)/g' -e 's/__BUILD_DATE__/$(BUILD_DATE)/g' -e 's/__SOURCE_SHA256__/$(shell sha256sum source_hashes_builddate.sha256)/g' < $< > $@

%_builddate.cpp: $(srcdir)/%.cpp source_hashes_builddate.sha256 builddate_foo
	sed -e 's/__VERSION__/$(VERSION)/g' -e 's/__BUILD_DATE__/$(BUILD_DATE)/g' -e 's/__SOURCE_SHA256__/$(shell sha256sum source_hashes_builddate.sha256)/g' < $< > $@


%_builddate.o: %_builddate.c
	$(CC) $(ABI_CFLAGS) $(CFLAGS) $(EXT_CFLAGS) $(INCLUDES) -c $< -o $*_builddate.o

%_builddate.o: %_builddate.cpp
	$(CXX) $(ABI_CFLAGS) $(CXXFLAGS) $(EXT_CFLAGS) $(INCLUDES) -c $< -o $*_builddate.o

clean::
	rm -f $(BUILDDATETARGETSOURCES)
	rm -f source_hashes_builddate.sha256