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glibc/elf/rtld-Rules
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# Subroutine makefile for compiling libc modules linked into dynamic linker. | |
# Copyright (C) 2002-2016 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 Lesser General Public | |
# License as published by the Free Software Foundation; either | |
# version 2.1 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 | |
# Lesser General Public License for more details. | |
# You should have received a copy of the GNU Lesser General Public | |
# License along with the GNU C Library; if not, see | |
# <http://www.gnu.org/licenses/>. | |
# This makefile is never used by itself, but only from the rtld-libc.a | |
# rule in Makefile, which does make -f librtld.mk -f rtld-Rules. | |
# librtld.mk is the generated file containing variable definitions for | |
# `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each | |
# SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names. | |
.PHONY: rtld-all | |
rtld-all: | |
# When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf. | |
ifneq ($(subdir),elf) | |
ifndef rtld-modules | |
error rtld-modules not set | |
endif | |
endif | |
ifndef rtld-modules | |
# Running to build rtld-libc.a, driving runs of $(rtld-subdir-make), below. | |
ifndef rtld-subdirs | |
error This makefile is a subroutine of elf/Makefile not to be used directly | |
endif | |
include ../Makeconfig | |
rtld-all: $(objpfx)rtld-libc.a | |
$(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\ | |
$(addprefix $(common-objpfx)$(dir)/rtld-,\ | |
$(rtld-$(dir)))) | |
@-rm -f $@T | |
$(AR) cq$(verbose) $@T $^ | |
mv -f $@T $@ | |
# Use the verbose option of ar and tar when not running silently. | |
ifeq "$(findstring s,$(MAKEFLAGS))" "" # if not -s | |
verbose := v | |
else # -s | |
verbose := | |
endif # not -s | |
# For each subdirectory, define a pattern rule that makes all of that | |
# subdirectory's modules at once with one recursive make command. | |
object-suffixes-left := $(rtld-subdirs) | |
define o-iterator-doit | |
$(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \ | |
+$$(rtld-subdir-make) | |
endef | |
include $(patsubst %,../o-iterator.mk,$(object-suffixes-left)) | |
# This is how we descend into each subdirectory. See below. | |
define rtld-subdir-make | |
$(MAKE) $(subdir-args) objdir=$(objdir) \ | |
-f Makefile -f ../elf/rtld-Rules rtld-all \ | |
rtld-modules='$(addprefix rtld-,$(rtld-$*))' | |
endef | |
# See subdir-target-args in ../Makefile for the model. | |
subdir-args = subdir=$*$(if $($*-srcdir),\ | |
-C $($*-srcdir) ..=`pwd`/,\ | |
-C $(..)$* ..=../) | |
FORCE: | |
else | |
# In this case we are being run by $(rtld-subdir-make), above. | |
# Some other subdir's Makefile has provided all its normal rules, | |
# and we just provide some additional definitions. | |
rtld-compile-command.S = $(compile-command.S) $(rtld-CPPFLAGS) | |
rtld-compile-command.s = $(compile-command.s) $(rtld-CPPFLAGS) | |
rtld-compile-command.c = $(compile-command.c) $(rtld-CPPFLAGS) | |
# These are the basic compilation rules corresponding to the Makerules ones. | |
# The sysd-rules generated makefile already defines pattern rules for rtld-% | |
# targets built from sysdeps source files. | |
$(objpfx)rtld-%.os: rtld-%.S $(before-compile) | |
$(rtld-compile-command.S) | |
$(objpfx)rtld-%.os: rtld-%.s $(before-compile) | |
$(rtld-compile-command.s) | |
$(objpfx)rtld-%.os: rtld-%.c $(before-compile) | |
$(rtld-compile-command.c) | |
$(objpfx)rtld-%.os: %.S $(before-compile) | |
$(rtld-compile-command.S) | |
$(objpfx)rtld-%.os: %.s $(before-compile) | |
$(rtld-compile-command.s) | |
$(objpfx)rtld-%.os: %.c $(before-compile) | |
$(rtld-compile-command.c) | |
# The rules for generated source files. | |
$(objpfx)rtld-%.os: $(objpfx)rtld-%.S $(before-compile) | |
$(rtld-compile-command.S) | |
$(objpfx)rtld-%.os: $(objpfx)rtld-%.s $(before-compile) | |
$(rtld-compile-command.s) | |
$(objpfx)rtld-%.os: $(objpfx)rtld-%.c $(before-compile) | |
$(rtld-compile-command.c) | |
$(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile) | |
$(rtld-compile-command.S) | |
$(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile) | |
$(rtld-compile-command.s) | |
$(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile) | |
$(rtld-compile-command.c) | |
# The command line setting of rtld-modules (see above) tells us | |
# what we need to build, and that tells us what dependency files we need. | |
rtld-all: $(addprefix $(objpfx),$(rtld-modules)) | |
# Figure out the dependency files we need. After respecting the $(omit-deps) | |
# list as applied to the names without the `rtld-', there may be none left. | |
rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.os.d,\ | |
$(filter-out $(omit-deps),\ | |
$(rtld-modules:rtld-%.os=%))) | |
rtld-depfiles := $(strip $(wildcard $(rtld-depfiles)) \ | |
$(patsubst %.dt,%.d,\ | |
$(wildcard $(rtld-depfiles:.d=.dt)))) | |
ifdef rtld-depfiles | |
-include $(rtld-depfiles) | |
endif | |
# This here is the whole point of all the shenanigans. | |
# Set libof-* for each routine. | |
cpp-srcs-left := $(rtld-modules:%.os=%) | |
lib := rtld | |
include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left)) | |
endif |