# Makefile for csu code for GNU C library.
-# Copyright (C) 1995-2017 Free Software Foundation, Inc.
+# Copyright (C) 1995-2019 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
# 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/>.
+# <https://www.gnu.org/licenses/>.
# This directory contains the C startup code (that which calls main). This
# consists of the startfile, built from start.c and installed as crt0.o
S$(start-installed-name)
omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
b$(start-installed-name) $(csu-dummies) \
- S$(start-installed-name))
+ S$(start-installed-name) \
+ r$(start-installed-name) \
+ gr$(start-installed-name))
install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
# No tests are allowed in the csu/ subdirectory because the startup
CFLAGS-.op += $(no-stack-protector)
CFLAGS-.os += $(no-stack-protector)
+# Dummy object not actually used for anything. It is linked into
+# crt1.o nevertheless, which in turn is statically linked into
+# applications, so that build flags matter.
+# See <https://sourceware.org/ml/libc-alpha/2018-07/msg00101.html>.
+# NB: Using $(stack-protector) in this way causes a wrong definition
+# STACK_PROTECTOR_LEVEL due to the preceding $(no-stack-protector),
+# but it does not matter for this source file.
+CFLAGS-static-reloc.os += $(stack-protector)
+
+# This file is not actually part of the startup code in the nonshared
+# case and statically linked into applications. See
+# <https://sourceware.org/bugzilla/show_bug.cgi?id=23323>,
+# <https://sourceware.org/ml/libc-alpha/2018-06/msg00717.html>.
+# Also see the note above regarding STACK_PROTECTOR_LEVEL.
+CFLAGS-elf-init.oS += $(stack-protector)
+
ifeq (yes,$(build-shared))
extra-objs += S$(start-installed-name) gmon-start.os
ifneq ($(start-installed-name),$(static-start-installed-name))
endif
ifneq ($(start-installed-name),$(static-start-installed-name))
+# FIXME: Only Hurd defines static-start-installed-name. Hurd needs to
+# provide special rules to support static PIE.
extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
g$(static-start-installed-name))
install-lib += $(static-start-installed-name) g$(static-start-installed-name)
+else
+ifeq (yes,$(enable-static-pie))
+extra-objs += r$(start-installed-name) gr$(start-installed-name)
+install-lib += r$(start-installed-name) gr$(start-installed-name)
+endif
endif
before-compile += $(objpfx)abi-tag.h
extra-objs += $(multilib-extra-objs)
endif
-extra-objs += abi-note.o init.o
+extra-objs += abi-note.o init.o static-reloc.o
+ifeq (yes,$(build-shared))
+extra-objs += static-reloc.os
+endif
asm-CPPFLAGS += -I$(objpfx).
# Enable unwinding so backtrace unwinds to __libc_start_main
# We link the ELF startfile along with a SHT_NOTE section indicating
# the kernel ABI the binaries linked with this library will require.
$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
+ $(objpfx)init.o $(objpfx)static-reloc.o
+ $(link-relocatable)
+$(objpfx)r$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
$(objpfx)init.o
$(link-relocatable)
$(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
# to turn on profiling code at startup.
ifeq (yes,$(build-shared))
$(objpfx)g$(start-installed-name): \
- $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os
+ $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os $(objpfx)static-reloc.os
+ $(link-relocatable)
+$(objpfx)gr$(start-installed-name): \
+ $(objpfx)gr%: $(objpfx)r% $(objpfx)gmon-start.o
$(link-relocatable)
ifneq ($(start-installed-name),$(static-start-installed-name))
$(objpfx)g$(static-start-installed-name): \