glibc/MakeTAGS

# Make the TAGS files.

# Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc.
# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public License
# as published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.

# The GNU C Library 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
# Library General Public License for more details.

# You should have received a copy of the GNU Library General Public
# License along with the GNU C Library; see the file COPYING.LIB.  If
# not, write to the Free Software Foundation, Inc., 675 Mass Ave,
# Cambridge, MA 02139, USA.

# Make this the default goal.
TAGS:

ifdef subdir
.. := ../
endif

include $(..)Makeconfig

ifndef tags_sources
ifeq ($(subdir),ctype)
# In most cases, we want the C source files to come before
# the header files so tags for optimizing #define's in the
# headers won't be put in the tags files, but for ctype,
# the functions are just backup for the #define's in the header.
tags_sources = $(all-headers) $(all-sources) $(all-dist)
else	# Not ctype.
tags_sources = $(all-sources) $(all-headers) $(all-dist)
endif	# ctype
endif	# No tags_sources

sysdep-dirs := $(addprefix $(sysdep_dir)/,$(sysdirs))

ifndef sysdep_dirs
# Find all sysdep directories.
sysdep_dirs := $(shell find $(..)sysdeps -type d \
					 ! -name RCS ! -name CVS -print)
endif

# Find all sysdep dirs there are, but putting the ones
# we are configured to use first and preserving their order.
all-dirs := $(objdir) \
	    $(sysdep-dirs) \
	    $(source_dirs) \
	    $(filter-out $(sysdep-dirs),$(sysdep_dirs))

vpath %.h $(all-dirs)
vpath %.c $(all-dirs)
vpath %.S $(all-dirs)
vpath %.s $(all-dirs)

# Find all the subdirs there are, but putting the ones
# we are configured to use first and preserving their order.
ifndef subdir
subdirs := $(subdirs) \
	   $(filter-out $(subdirs),\
			$(shell sed -e 's/\#.*$$//' \
				    $(wildcard $(addsuffix /Subdirs,\
							   $(all-dirs)))\
				    /dev/null))
all-dist = $(foreach Dist,$(wildcard $(all-dirs:%=%/Dist)),\
		     $(addprefix $(Dist:%/Dist=%)/,\
				 $(filter %.c %.h %.S %.s,\
					  $(shell cat $(Dist)))))
tags_sources = $(all-sources) $(all-headers) $(all-dist)
else
all-dist = $(distribute)
endif

sources += $(filter %.c %.s %.S,$(all-dist))
headers += $(filter %.h,$(all-dist))
all-dist := $(filter-out %.h %.c %.s %.S,$(all-dist))

# All different versions of $(sources), preserving the configured sysdep
# directory order.
all-sources = $(shell find . $(all-dirs) -maxdepth 1 \( -name fnord \
			   $(foreach file,$(sort $(sources) $(sources:.c=.S) \
						 $(sources:.c=.s)),\
				     -o -name $(file)) \
			   \) -print)

all-headers = $(shell find . $(all-dirs) -maxdepth 1 \( -name fnord \
			   $(foreach file,$(headers),-o -name $(file)) \
			   \) -print)

tags_sources := $(strip $(tags_sources))

TAGS: $(tags_sources)
ifdef subdir
ifdef tags_sources
	$(ETAGS) -o $@ $^
else
# No sources.  Create a dummy file. 
	touch $@
endif # tags_sources
else # parent
TAGS: subdir_TAGS
# Note that this uses the -i switch, and thus requires v19 etags.
	$(ETAGS) -o $@ \
		 $(subdirs:%=-i %/TAGS) \
		 $(filter-out subdir_TAGS,$^)

.PHONY: subdir_TAGS $(subdirs:%=%/TAGS)
subdir_TAGS: $(subdirs:%=%/TAGS)
$(subdirs:%=%/TAGS):
	$(MAKE) -C $(@D) no_deps=t $(@F)

endif # subdir