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The current scheme to identify which module a translation unit is built in depends on defining multiple macros IS_IN_* and also defining NOT_IN_libc if we're building a non-libc module. In addition, there is an IN_LIB macro that does effectively the same thing, but for different modules (notably the systemtap probes). This macro scheme unifies both ideas to use just one macro IN_MODULE and assign it a value depending on the module it is being built into. If the module is not defined, it defaults to MODULE_libc. Patches that follow will replace uses of IS_IN_* variables with the IS_IN() macro. libc-symbols.h has been converted already to give an example of how such a transition will look. Verified that there are no relevant binary changes. One source change that will crop up repeatedly is that of nscd_stat, since it uses the build timestamp as a constant in its logic. * Makeconfig (in-module): Get value of libof set for the translation unit. (CPPFLAGS): Use $(in-module). * Makerules: Don't suffix routine names for nonlib. * include/libc-modules.h: New file. * include/libc-symbols.h: Include libc-modules.h (IS_IN): New macro to replace IS_IN_* macros. * elf/Makefile: Set libof-* for each routine. * elf/rtld-Rules: Likewise. * extra-modules.mk: Likewise. * iconv/Makefile: Likewise. * iconvdata/Makefile: Likewise. * locale/Makefile: Likewise. * malloc/Makefile: Likewise. * nss/Makefile: Likewise. * sysdeps/gnu/Makefile: Likewise. * sysdeps/ieee754/ldbl-opt/Makefile: Likewise. * sysdeps/unix/sysv/linux/Makefile: Likewise. * sysdeps/s390/s390-64/Makefile: Likewise. * nscd/Makefile: Set libof-* for each routine. Set CFLAGS and CPPFLAGS for nscd instead of nonlib.
150 lines
5.1 KiB
Plaintext
150 lines
5.1 KiB
Plaintext
# Subroutine makefile for compiling libc modules linked into dynamic linker.
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# Copyright (C) 2002-2014 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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# This makefile is never used by itself, but only from the rtld-libc.a
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# rule in Makefile, which does make -f librtld.mk -f rtld-Rules.
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# librtld.mk is the generated file containing variable definitions for
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# `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each
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# SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names.
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.PHONY: rtld-all
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rtld-all:
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# When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
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ifneq ($(subdir),elf)
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ifndef rtld-modules
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error rtld-modules not set
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endif
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endif
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ifndef rtld-modules
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# Running to build rtld-libc.a, driving runs of $(rtld-subdir-make), below.
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ifndef rtld-subdirs
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error This makefile is a subroutine of elf/Makefile not to be used directly
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endif
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include ../Makeconfig
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rtld-all: $(objpfx)rtld-libc.a
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$(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
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$(addprefix $(common-objpfx)$(dir)/rtld-,\
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$(rtld-$(dir))))
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@-rm -f $@T
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$(AR) cq$(verbose) $@T $^
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mv -f $@T $@
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# Use the verbose option of ar and tar when not running silently.
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ifeq "$(findstring s,$(MAKEFLAGS))" "" # if not -s
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verbose := v
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else # -s
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verbose :=
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endif # not -s
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# For each subdirectory, define a pattern rule that makes all of that
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# subdirectory's modules at once with one recursive make command.
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object-suffixes-left := $(rtld-subdirs)
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define o-iterator-doit
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$(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \
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+$$(rtld-subdir-make)
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endef
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include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
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# This is how we descend into each subdirectory. See below.
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define rtld-subdir-make
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$(MAKE) $(subdir-args) objdir=$(objdir) \
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-f Makefile -f ../elf/rtld-Rules rtld-all \
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rtld-modules='$(addprefix rtld-,$(rtld-$*))'
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endef
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# See subdir-target-args in ../Makefile for the model.
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subdir-args = subdir=$*$(if $($*-srcdir),\
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-C $($*-srcdir) ..=`pwd`/,\
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-C $(..)$* ..=../)
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FORCE:
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else
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# In this case we are being run by $(rtld-subdir-make), above.
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# Some other subdir's Makefile has provided all its normal rules,
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# and we just provide some additional definitions.
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rtld-compile-command.S = $(compile-command.S) $(rtld-CPPFLAGS)
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rtld-compile-command.s = $(compile-command.s) $(rtld-CPPFLAGS)
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rtld-compile-command.c = $(compile-command.c) $(rtld-CPPFLAGS)
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# These are the basic compilation rules corresponding to the Makerules ones.
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# The sysd-rules generated makefile already defines pattern rules for rtld-%
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# targets built from sysdeps source files.
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$(objpfx)rtld-%.os: rtld-%.S $(before-compile)
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$(rtld-compile-command.S)
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$(objpfx)rtld-%.os: rtld-%.s $(before-compile)
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$(rtld-compile-command.s)
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$(objpfx)rtld-%.os: rtld-%.c $(before-compile)
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$(rtld-compile-command.c)
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$(objpfx)rtld-%.os: %.S $(before-compile)
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$(rtld-compile-command.S)
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$(objpfx)rtld-%.os: %.s $(before-compile)
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$(rtld-compile-command.s)
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$(objpfx)rtld-%.os: %.c $(before-compile)
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$(rtld-compile-command.c)
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# The rules for generated source files.
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$(objpfx)rtld-%.os: $(objpfx)rtld-%.S $(before-compile)
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$(rtld-compile-command.S)
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$(objpfx)rtld-%.os: $(objpfx)rtld-%.s $(before-compile)
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$(rtld-compile-command.s)
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$(objpfx)rtld-%.os: $(objpfx)rtld-%.c $(before-compile)
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$(rtld-compile-command.c)
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$(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile)
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$(rtld-compile-command.S)
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$(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile)
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$(rtld-compile-command.s)
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$(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile)
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$(rtld-compile-command.c)
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# The command line setting of rtld-modules (see above) tells us
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# what we need to build, and that tells us what dependency files we need.
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rtld-all: $(addprefix $(objpfx),$(rtld-modules))
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# Figure out the dependency files we need. After respecting the $(omit-deps)
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# list as applied to the names without the `rtld-', there may be none left.
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rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.os.d,\
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$(filter-out $(omit-deps),\
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$(rtld-modules:rtld-%.os=%)))
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rtld-depfiles := $(strip $(wildcard $(rtld-depfiles)) \
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$(patsubst %.dt,%.d,\
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$(wildcard $(rtld-depfiles:.d=.dt))))
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ifdef rtld-depfiles
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-include $(rtld-depfiles)
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endif
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# Set libof-* for each routine.
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cpp-srcs-left := $(rtld-modules:%.os=%)
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lib := rtld
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include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
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# This here is the whole point of all the shenanigans.
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rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld
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endif
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