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60b42421e9
This patch implements the --enable-host-pie configure option which makes the compiler executables PIE. This can be used to enhance protection against ROP attacks, and can be viewed as part of a wider trend to harden binaries. Co-Authored by: Iain Sandoe <iain@sandoe.co.uk> * configure.ac (--enable-host-pie): New check. Set PICFLAG after this check. intl/ * configure.ac (--enable-host-shared): Don't set PICFLAG here. (--enable-host-pie): New check. Set PICFLAG after this check. libdecnumber/ * configure.ac (--enable-host-shared): Don't set PICFLAG here. (--enable-host-pie): New check. Set PICFLAG after this check. zlib/ * configure.ac (--enable-host-shared): Don't set PICFLAG here. (--enable-host-pie): New check. Set PICFLAG after this check.
126 lines
3.4 KiB
Plaintext
126 lines
3.4 KiB
Plaintext
# configure.ac for libdecnumber -*- Autoconf -*-
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# Process this file with autoconf to generate a configuration script.
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# Copyright (C) 2005-2018 Free Software Foundation, Inc.
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# This file is part of GCC.
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# GCC is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3, or (at your option) any
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# later #version.
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# GCC is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License #for more details.
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>.
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AC_INIT(libdecnumber, [ ], gcc-bugs@gcc.gnu.org, libdecnumber)
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AC_CONFIG_SRCDIR(decNumber.h)
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AC_CONFIG_MACRO_DIR(../config)
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AC_CONFIG_AUX_DIR(..)
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# Checks for programs.
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AC_PROG_MAKE_SET
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AC_PROG_CC
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AC_PROG_RANLIB
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MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
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AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
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AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
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AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
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# Figure out what compiler warnings we can enable.
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# See config/warnings.m4 for details.
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ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
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-Wmissing-prototypes -Wold-style-definition \
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-Wmissing-format-attribute -Wcast-qual])
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ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
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ACX_PROG_CC_WARNING_OPTS([-fno-lto], [nolto_flags])
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# Only enable with --enable-werror-always until existing warnings are
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# corrected.
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ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
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# Checks for header files.
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AC_CHECK_HEADERS(ctype.h stddef.h string.h stdio.h)
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GCC_HEADER_STDINT(gstdint.h)
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# Checks for typedefs, structures, and compiler characteristics.
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AC_C_CONST
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AC_TYPE_OFF_T
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AC_CHECK_SIZEOF(int)
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AC_CHECK_SIZEOF(long)
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# Checks for library functions.
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AC_HEADER_STDC
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AC_ARG_ENABLE(maintainer-mode,
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[ --enable-maintainer-mode enable rules only needed by maintainers],,
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enable_maintainer_mode=no)
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if test "x$enable_maintainer_mode" = xno; then
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MAINT='#'
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else
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MAINT=
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fi
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AC_SUBST(MAINT)
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AC_CANONICAL_TARGET
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# Default decimal format
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# If you change the defaults here, be sure to change them in the GCC directory also
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AC_MSG_CHECKING([for decimal floating point])
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GCC_AC_ENABLE_DECIMAL_FLOAT([$target])
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# Use default_decimal_float for dependency.
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enable_decimal_float=$default_decimal_float
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# If BID is being used, additional objects should be linked in.
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if test x$enable_decimal_float = xbid; then
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ADDITIONAL_OBJS="$ADDITIONAL_OBJS \$(bid_OBJS)"
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else
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ADDITIONAL_OBJS=
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fi
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AC_MSG_RESULT($enable_decimal_float)
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AC_SUBST(enable_decimal_float)
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AC_SUBST(ADDITIONAL_OBJS)
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AC_C_BIGENDIAN
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# Enable --enable-host-shared.
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AC_ARG_ENABLE(host-shared,
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[AS_HELP_STRING([--enable-host-shared],
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[build host code as shared libraries])])
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AC_SUBST(enable_host_shared)
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# Enable --enable-host-pie.
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AC_ARG_ENABLE(host-pie,
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[AS_HELP_STRING([--enable-host-pie],
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[build host code as PIE])])
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AC_SUBST(enable_host_pie)
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if test x$enable_host_shared = xyes; then
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PICFLAG=-fPIC
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elif test x$enable_host_pie = xyes; then
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PICFLAG=-fPIE
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else
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PICFLAG=
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fi
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AC_SUBST(PICFLAG)
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# Output.
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AC_CONFIG_HEADERS(config.h:config.in, [echo timestamp > stamp-h1])
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AC_CONFIG_FILES(Makefile)
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AC_OUTPUT
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