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6ab674ebff
With gcc-4.9, a new -fstack-protector-strong flag is available that is between -fstack-protector (pretty weak) and -fstack-protector-all (pretty strong) that provides good trade-offs between overhead but still providing good coverage. Update the places in glibc that use ssp to use this flag when it's available. This also kills off the indirection of hardcoding the flag name in the Makefiles and adding it based on a have-ssp boolean. Instead, the build always expands the $(stack-protector) variable to the best ssp setting. This makes the build logic a bit simpler and allows people to easily set to a diff flag like: make stack-protector=-fstack-protector-all
75 lines
2.1 KiB
Makefile
75 lines
2.1 KiB
Makefile
# Copyright (C) 1996-2015 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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#
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# Sub-makefile for login portion of the library.
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#
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subdir := login
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include ../Makeconfig
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headers := utmp.h bits/utmp.h lastlog.h pty.h
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routines := getlogin getlogin_r setlogin getlogin_r_chk \
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getutent getutent_r getutid getutline getutid_r getutline_r \
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utmp_file utmpname updwtmp getpt grantpt unlockpt ptsname \
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ptsname_r_chk
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CFLAGS-grantpt.c = -DLIBEXECDIR='"$(libexecdir)"'
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others = utmpdump
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ifeq (yes,$(build-pt-chown))
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others += pt_chown
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others-pie = pt_chown
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install-others-programs = $(inst_libexecdir)/pt_chown
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endif
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subdir-dirs = programs
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vpath %.c programs
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tests := tst-utmp tst-utmpx tst-grantpt tst-ptsname tst-getlogin
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# Build the -lutil library with these extra functions.
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extra-libs := libutil
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extra-libs-others := $(extra-libs)
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libutil-routines:= login login_tty logout logwtmp openpty forkpty
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include ../Rules
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CFLAGS-getpt.c = -fexceptions
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ifeq (yesyes,$(have-fpie)$(build-shared))
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pt_chown-cflags += $(pie-ccflag)
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endif
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pt_chown-cflags += $(stack-protector)
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ifeq (yes,$(have-libcap))
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libcap = -lcap
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endif
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CFLAGS-pt_chown.c = $(pt_chown-cflags)
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LDLIBS-pt_chown = $(libcap)
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ifeq (yesyes,$(have-fpie)$(build-shared))
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LDFLAGS-pt_chown = -Wl,-z,now
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endif
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# pt_chown needs to be setuid root.
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$(inst_libexecdir)/pt_chown: $(objpfx)pt_chown $(+force)
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$(make-target-directory)
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-$(INSTALL_PROGRAM) -m 4755 -o root $< $@
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