1 # Subroutine makefile for compiling libc modules linked into dynamic linker.
3 # Copyright (C) 2002, 2003 Free Software Foundation, Inc.
4 # This file is part of the GNU C Library.
6 # The GNU C Library is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU Lesser General Public
8 # License as published by the Free Software Foundation; either
9 # version 2.1 of the License, or (at your option) any later version.
11 # The GNU C Library is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # Lesser General Public License for more details.
16 # You should have received a copy of the GNU Lesser General Public
17 # License along with the GNU C Library; if not, write to the Free
18 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 # This makefile is never used by itself, but only from the rtld-libc.a
22 # rule in Makefile, which does make -f librtld.mk -f rtld-Rules.
23 # librtld.mk is the generated file containing variable definitions for
24 # `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each
25 # SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names.
30 # When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
34 error This makefile is a subroutine of elf/Makefile not to be used directly
39 rtld-all: $(objpfx)rtld-libc.a
41 $(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
42 $(addprefix $(common-objpfx)$(dir)/rtld-,\
45 $(AR) cq$(verbose) $@T $^
49 # Use the verbose option of ar and tar when not running silently.
50 ifeq "$(findstring s,$(MAKEFLAGS))" "" # if not -s
57 # For each subdirectory, define a pattern rule that makes all of that
58 # subdirectory's modules at once with one recursive make command.
59 object-suffixes-left := $(rtld-subdirs)
60 define o-iterator-doit
61 $(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \
64 include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
66 # This is how we descend into each subdirectory. See below.
67 define rtld-subdir-make
68 $(MAKE) -C ../$* objdir=$(objdir) -f Makefile -f ../elf/rtld-Rules rtld-all \
69 rtld-modules='$(addprefix rtld-,$(rtld-$*))'
76 # In this case we are being run by $(rtld-subdir-make), above.
77 # Some other subdir's Makefile has provided all its normal rules,
78 # and we just provide some additional definitions.
80 # These are the basic compilation rules corresponding to the Makerules ones.
81 # The sysd-rules generated makefile already defines pattern rules for rtld-%
82 # targets built from sysdeps source files.
83 $(objpfx)rtld-%.os: %.S $(before-compile); $(compile-command.S)
84 $(objpfx)rtld-%.os: %.s $(before-compile); $(compile-command.s)
85 $(objpfx)rtld-%.os: %.c $(before-compile); $(compile-command.c)
87 # The rules for generated source files.
88 $(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile); $(compile-command.S)
89 $(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile); $(compile-command.s)
90 $(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile); $(compile-command.c)
92 # The command line setting of rtld-modules (see above) tells us
93 # what we need to build, and that tells us what dependency files we need.
94 rtld-all: $(addprefix $(objpfx),$(rtld-modules))
96 # Figure out the dependency files we need. After respecting the $(omit-deps)
97 # list as applied to the names without the `rtld-', there may be none left.
98 rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.os.d,\
99 $(filter-out $(omit-deps),\
100 $(rtld-modules:rtld-%.os=%)))
101 rtld-depfiles := $(strip $(wildcard $(rtld-depfiles)) \
102 $(patsubst %.dt,%.d,\
103 $(wildcard $(rtld-depfiles:.d=.dt))))
105 -include $(rtld-depfiles)
108 # Just in case we wind up e.g. regenerating dependencies for non-rtld objects,
109 # we don't unconditionally modify the flags. For rtld-% targets, use the
110 # special flags set below.
111 CFLAGS += $(if $(filter rtld-%,$(@F)),$(CFLAGS-rtld))
112 CPPFLAGS += $(if $(filter rtld-%,$(@F)),$(CPPFLAGS-rtld))
115 # This here is the whole point of all the shenanigans.
116 CPPFLAGS-rtld := -DNOT_IN_libc=1 -DIS_IN_rtld=1
117 CFLAGS-rtld := # blah