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+# LIBRARY-DIRECTORY-MAKEFILE
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+# conventions:
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+# - all subdirectories containing a "Makefile.inc" are considered sublibraries
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+# exception: "progs/" and "tests/" subdirectories!
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+# - all ".C", ".cpp" and ".c" files in the current directory are linked to a
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+# library
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+# - the library depends on all sublibraries
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+# - the library name is created with $(LIBNAME), i.e. it will be somehow
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+# related to the directory name and with the extension .a
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+# (e.g. lib1/sublib -> lib1_sublib.a)
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+# - the library will be added to the default build list ALL_LIBRARIES
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+
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+# --------------------------------
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+# - remember the last subdirectory
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+#
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+# set the variable $(SUBDIR) correctly to the current subdirectory. this
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+# variable can be used throughout the current makefile.inc. The many
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+# SUBDIR_before, _add, and everything are only required so that we can recover
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+# the previous content of SUBDIR before exitting the makefile.inc
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+
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+SUBDIR_add:=$(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
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+SUBDIR_before:=$(SUBDIR)
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+SUBDIR:=$(strip $(SUBDIR_add))
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+SUBDIR_before_$(SUBDIR):=$(SUBDIR_before)
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+ifeq "$(SUBDIR)" "./"
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+SUBDIR:=
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+endif
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+
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+# ------------------------
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+# - include subdirectories
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+#
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+# note the variables $(SUBDIRS_OF_$(SUBDIR)) are required later on to recover
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+# the dependencies automatically. if you handle dependencies on your own, you
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+# can also dump the $(SUBDIRS_OF_$(SUBDIR)) variable, and include the
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+# makefile.inc of the subdirectories on your own...
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+
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+SUBDIRS_OF_$(SUBDIR):=$(patsubst %/Makefile.inc,%,$(wildcard $(SUBDIR)*/Makefile.inc))
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+include $(SUBDIRS_OF_$(SUBDIR):%=%/Makefile.inc)
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+
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+# ----------------------------
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+# - include local dependencies
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+#
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+# you can specify libraries needed by the individual objects or by the whole
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+# directory. the object specific additional libraries are only considered
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+# when compiling the specific object files
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+# TODO: update documentation...
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+
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+-include $(SUBDIR)libdepend.inc
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+
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+$(foreach d,$(filter-out %progs %tests,$(SUBDIRS_OF_$(SUBDIR))),$(eval $(call PKG_DEPEND_INT,$(d))))
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+
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+# ---------------------------
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+# - objects in this directory
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+#
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+# the use of the variable $(OBJS) is not mandatory. it is mandatory however
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+# to update $(ALL_OBJS) in a way that it contains the path and name of
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+# all objects. otherwise we can not include the appropriate .d files.
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+
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+OBJS:=$(patsubst %.cpp,$(OBJDIR)%.o,$(notdir $(wildcard $(SUBDIR)*.cpp))) \
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+ $(patsubst %.C,$(OBJDIR)%.o,$(notdir $(wildcard $(SUBDIR)*.C))) \
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+ $(shell grep -ls Q_OBJECT $(SUBDIR)*.h | sed -e's@^@/@;s@.*/@$(OBJDIR)moc_@;s@\.h$$@.o@') \
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+ $(patsubst %.c,$(OBJDIR)%.o,$(notdir $(wildcard $(SUBDIR)*.c)))
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+ALL_OBJS += $(OBJS)
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+
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+# ----------------------------
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+# - binaries in this directory
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+#
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+# output of binaries in this directory. none of the variables has to be used.
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+# but everything you add to $(ALL_LIBRARIES) and $(ALL_BINARIES) will be
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+# compiled with `make all`. be sure again to add the files with full path.
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+
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+LIBRARY_BASENAME:=$(call LIBNAME,$(SUBDIR))
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+ifneq "$(SUBDIR)" ""
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+ALL_LIBRARIES+=$(LIBDIR)$(LIBRARY_BASENAME).$(LINK_FILE_EXTENSION)
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+endif
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+
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+# ---------------------
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+# - binary dependencies
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+#
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+# there is no way of determining the binary dependencies automatically, so we
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+# follow conventions. the current library depends on all sublibraries.
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+# all other dependencies have to be added manually by specifying, that the
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+# current .pc file depends on some other .pc file. binaries depending on
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+# libraries should exclusivelly use the .pc files as well.
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+
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+ifeq "$(SKIP_BUILD_$(OBJDIR))" "1"
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+$(LIBDIR)$(LIBRARY_BASENAME).a:
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+else
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+$(LIBDIR)$(LIBRARY_BASENAME).a:$(OBJS) \
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+ $(call PRINT_INTLIB_DEPS,$(PKGDIR)$(LIBRARY_BASENAME).a,.$(LINK_FILE_EXTENSION))
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+endif
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+
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+$(PKGDIR)$(LIBRARY_BASENAME).pc: \
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+ $(call PRINT_INTLIB_DEPS,$(PKGDIR)$(LIBRARY_BASENAME).pc,.pc)
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+
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+# -------------------
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+# - subdir management
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+#
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+# as the last step, always add this line to correctly recover the subdirectory
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+# of the makefile including this one!
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+
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+SUBDIR:=$(SUBDIR_before_$(SUBDIR))
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+
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Alexander Freytag