glibc/Rules

# Copyright (C) 1991, 92, 93, 94, 95, 96 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.

#
#	Rules for making a subdirectory in the GNU C library.
#	Each subdirectory Makefile defines some variables and includes this.
#
ifneq (,)
This makefile requires GNU Make.
endif

all: # Don't let the default goal come from Makeconfig.

include ../Makeconfig

ifndef	subdir
Each subdirectory makefile must define the `subdir' variable.
endif
# This is benign and useless in GNU make before 3.63.
export subdir := $(subdir)

# This is the default target; it makes the library and auxiliary programs.
.PHONY: all
all: objs lib others

others: $(addprefix $(objpfx),$(extra-objs) \
			      $(install-lib) $(install-bin) $(install-sbin))

ifneq	"$(findstring env,$(origin headers))" ""
headers :=
endif

ifneq	"$(findstring env,$(origin generated))" ""
generated :=
endif

ifeq "$(strip $(headers))" ""
ifneq "$(wildcard $(subdir).h)" ""
override headers := $(subdir).h
endif
endif

include ../Makerules

.PHONY: subdir_lib
subdir_lib: lib-noranlib

# Some subdirs need to install a dummy library.
# They can use "$(objpfx)libfnord.a: $(dep-dummy-lib); $(make-dummy-lib)".
dep-dummy-lib = $(objpfx)dummy.o
define make-dummy-lib
$(AR) cr$(verbose) $@ $<
endef
$(objpfx)dummy.o:
	@rm -f $(@:.o=.c)
	echo 'void __dummy__ () { }' > $(@:.o=.c)
	$(CC) -c $(@:.o=.c) -o $@
$(objpfx)empty.o:
	@rm -f $(@:.o=.c)
	echo '' > $(@:.o=.c)
	$(CC) -c $(@:.o=.c) -o $@
generated := $(generated) dummy.o dummy.c empty.c empty.o

# This makes all the auxilliary and test programs.

.PHONY: others tests
others: $(addprefix $(objpfx),$(others) $(extra-objs))
ifeq ($(cross-compiling),yes)
tests: $(addprefix $(objpfx),$(tests))
else
tests: $(tests:%=$(objpfx)%.out)
endif

ifneq "$(strip $(others) $(tests))" ""
$(addprefix $(objpfx),$(others) $(tests)): %: %.o \
  $(sort $(filter $(common-objpfx)libc%,$(link-libc)))
	$(+link)
endif

ifneq "$(strip $(tests))" ""
# These are the implicit rules for making test outputs
# from the test programs and whatever input files are present.
$(objpfx)%.out: %.args $(objpfx)% %.input
	$($*-ENV) $(built-program-cmd) `cat $(word 1,$^)` < $(word 3,$^) > $@
$(objpfx)%.out: %.args $(objpfx)%
	$($*-ENV) $(built-program-cmd) `cat $(word 1,$^)` > $@
$(objpfx)%.out: %.input $(objpfx)%
	$($*-ENV) $(built-program-cmd) < $(word 1,$^) > $@
$(objpfx)%.out: /dev/null $(objpfx)%	# Make it 2nd arg for canned sequence.
	$($*-ENV) $(built-program-cmd) > $@
endif	# tests

.PHONY: distclean realclean subdir_distclean subdir_realclean \
	subdir_clean subdir_mostlyclean
subdir_mostlyclean: mostlyclean
subdir_clean: clean
subdir_distclean: distclean
subdir_realclean: realclean
realclean: distclean
distclean: clean

.PHONY: subdir_echo-headers
subdir_echo-headers: echo-headers

.PHONY: subdir_echo-distinfo
subdir_echo-distinfo:
	@echo $(addprefix +header+,$(headers)) \
	      $(addprefix +nodist+,$(generated) $(dont_distribute))

# We want to install everything except the library itself, but update all
# our portions of the library because the parent make will install it later
# (likewise the stubs file).
.PHONY: subdir_install
subdir_install: install-no-libc.a lib-noranlib stubs

.PHONY: subdir_TAGS subdir_dist
subdir_TAGS: TAGS
subdir_dist: dist

# Convenient target to update all the generated source files.
.PHONY: generated
generated: $(addprefix $(objpfx),$(generated))

ifndef libc.so-version
# Undefine this because it can't work when we libc.so is unversioned.
static-only-routines =
endif

ifdef static-only-routines
# These routines are to be omitted from the shared library object,
# so we replace the PIC objects for them with the empty object file.
$(static-only-routines:%=$(objpfx)%.so): %.so: $(objpfx)empty.o
	rm -f $@
	ln $< $@
endif