elf/rtld-Rules

   1 # Subroutine makefile for compiling libc modules linked into dynamic linker.
   2
   3 # Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   4 # This file is part of the GNU C Library.
   5
   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.
  10
  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.
  15
  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
  19 # 02111-1307 USA.
  20
  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.
  26
  27 .PHONY: rtld-all
  28 rtld-all:
  29
  30 # When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
  31 ifeq ($(subdir),elf)
  32
  33 ifndef rtld-subdirs
  34 error This is makefile is a subroutine of elf/Makefile not to be used directly
  35 endif
  36
  37 include ../Makeconfig
  38
  39 rtld-all: $(objpfx)rtld-libc.a
  40
  41 $(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
  42                                 $(addprefix $(common-objpfx)$(dir)/rtld-,\
  43                                             $(rtld-$(dir))))
  44         @-rm -f $@T
  45         $(AR) cq$(verbose) $@T $^
  46         $(RANLIB) $@T
  47         mv -f $@T $@
  48
  49 # Use the verbose option of ar and tar when not running silently.
  50 ifeq    "$(findstring s,$(MAKEFLAGS))" ""       # if not -s
  51 verbose := v
  52 else                                            # -s
  53 verbose :=
  54 endif                                           # not -s
  55
  56
  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 ; \
  62         +$$(rtld-subdir-make)
  63 endef
  64 include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
  65
  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-,$(rtld-$*))'
  70 endef
  71
  72 FORCE:
  73
  74 else
  75
  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.
  79
  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)
  86
  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)
  91
  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))
  95
  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))))
 104 ifdef rtld-depfiles
 105 -include $(rtld-depfiles)
 106 endif
 107
 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))
 113
 114
 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
 118
 119
 120 endif