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64d9580cdf
Add --enable-fortify-source option.
It is now possible to enable fortification through a configure option.
The level may be given as parameter, if none is provided, the configure
script will determine what is the highest level possible that can be set
considering GCC built-ins availability and set it.
If level is explicitly set to 3, configure checks if the compiler
supports the built-in function necessary for it or raise an error if it
isn't.
If the configure option isn't explicitly enabled, it _FORTIFY_SOURCE is
forcibly undefined (and therefore disabled).
The result of the configure checks are new variables, ${fortify_source}
and ${no_fortify_source} that can be used to appropriately populate
CFLAGS.
A dedicated patch will follow to make use of this variable in Makefiles
when necessary.
Updated NEWS and INSTALL.
Adding dedicated x86_64 variant that enables the configuration.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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) 2002-2023 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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# <https://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 $@
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# Use the verbose option of ar and tar when not running silently.
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ifeq ($(silent-make),no) # 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) $(rtld-CFLAGS)
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# These are the basic compilation rules corresponding to the Makerules ones.
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# The sysd-rules generated makefile already defines pattern rules for rtld-%
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# targets built from sysdeps source files.
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$(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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# This here is the whole point of all the shenanigans.
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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 $(patsubst %,$(..)libof-iterator.mk,$(cpp-srcs-left))
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rtld-CFLAGS += $(no-stack-protector) $(no-fortify-source)
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endif
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