configure.ac 51.9 KB
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dnl Copyright (c) 2001-2004, Roger Dingledine
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dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
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dnl Copyright (c) 2007-2015, The Tor Project, Inc.
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dnl See LICENSE for licensing information
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AC_INIT([tor],[0.2.7.1-alpha-dev])
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AC_CONFIG_SRCDIR([src/or/main.c])
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AC_CONFIG_MACRO_DIR([m4])
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AM_INIT_AUTOMAKE
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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AC_CONFIG_HEADERS([orconfig.h])
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AC_CANONICAL_HOST

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PKG_PROG_PKG_CONFIG

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if test -f /etc/redhat-release ; then
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  if test -f /usr/kerberos/include ; then
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    CPPFLAGS="$CPPFLAGS -I/usr/kerberos/include"
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  fi
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fi
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# Not a no-op; we want to make sure that CPPFLAGS is set before we use
# the += operator on it in src/or/Makefile.am
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CPPFLAGS="$CPPFLAGS -I\${top_srcdir}/src/common"
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#XXXX020 We should make these enabled or not, before 0.2.0.x-final
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AC_ARG_ENABLE(openbsd-malloc,
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   AS_HELP_STRING(--enable-openbsd-malloc, [use malloc code from OpenBSD.  Linux only]))
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AC_ARG_ENABLE(instrument-downloads,
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   AS_HELP_STRING(--enable-instrument-downloads, [instrument downloads of directory resources etc.]))
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AC_ARG_ENABLE(static-openssl,
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   AS_HELP_STRING(--enable-static-openssl, [link against a static openssl library. Requires --with-openssl-dir]))
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AC_ARG_ENABLE(static-libevent,
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   AS_HELP_STRING(--enable-static-libevent, [link against a static libevent library. Requires --with-libevent-dir]))
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AC_ARG_ENABLE(static-zlib,
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   AS_HELP_STRING(--enable-static-zlib, [link against a static zlib library. Requires --with-zlib-dir]))
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AC_ARG_ENABLE(static-tor,
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   AS_HELP_STRING(--enable-static-tor, [create an entirely static Tor binary. Requires --with-openssl-dir and --with-libevent-dir and --with-zlib-dir]))
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AC_ARG_ENABLE(unittests,
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   AS_HELP_STRING(--disable-unittests, [don't build unit tests for Tor. Risky!]))
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AC_ARG_ENABLE(coverage,
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   AS_HELP_STRING(--enable-coverage, [enable coverage support in the unit-test build]))
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AC_ARG_ENABLE(system-torrc,
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   AS_HELP_STRING(--disable-system-torrc, [don't look for a system-wide torrc file]))
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AM_CONDITIONAL(UNITTESTS_ENABLED, test x$enable_unittests != xno)
AM_CONDITIONAL(COVERAGE_ENABLED, test x$enable_coverage = xyes)

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if test "$enable_static_tor" = "yes"; then
  enable_static_libevent="yes";
  enable_static_openssl="yes";
  enable_static_zlib="yes";
  CFLAGS="$CFLAGS -static"
fi
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if test "$enable_system_torrc" = "no"; then
  AC_DEFINE(DISABLE_SYSTEM_TORRC, 1,
            [Defined if we're not going to look for a torrc in SYSCONF])
fi

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AM_CONDITIONAL(USE_OPENBSD_MALLOC, test x$enable_openbsd_malloc = xyes)
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if test x$enable_instrument_downloads = xyes; then
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  AC_DEFINE(INSTRUMENT_DOWNLOADS, 1,
            [Defined if we want to keep track of how much of each kind of resource we download.])
fi
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AC_ARG_ENABLE(transparent,
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     AS_HELP_STRING(--disable-transparent, [disable transparent proxy support]),
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     [case "${enableval}" in
        yes) transparent=true ;;
        no)  transparent=false ;;
        *) AC_MSG_ERROR(bad value for --enable-transparent) ;;
      esac], [transparent=true])

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AC_ARG_ENABLE(asciidoc,
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     AS_HELP_STRING(--disable-asciidoc, [don't use asciidoc (disables building of manpages)]),
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     [case "${enableval}" in
        yes) asciidoc=true ;;
        no)  asciidoc=false ;;
        *) AC_MSG_ERROR(bad value for --disable-asciidoc) ;;
      esac], [asciidoc=true])

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# By default, we're not ready to ship a NAT-PMP aware Tor
AC_ARG_ENABLE(nat-pmp,
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     AS_HELP_STRING(--enable-nat-pmp, [enable NAT-PMP support]),
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     [case "${enableval}" in
        yes) natpmp=true ;;
        no)  natpmp=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-nat-pmp) ;;
      esac], [natpmp=false])

# By default, we're not ready to ship a UPnP aware Tor
AC_ARG_ENABLE(upnp,
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     AS_HELP_STRING(--enable-upnp, [enable UPnP support]),
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     [case "${enableval}" in
        yes) upnp=true ;;
        no)  upnp=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-upnp) ;;
      esac], [upnp=false])

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# systemd notify support
AC_ARG_ENABLE(systemd,
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      AS_HELP_STRING(--enable-systemd, [enable systemd notification support]),
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      [case "${enableval}" in
        yes) systemd=true ;;
        no)  systemd=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-systemd) ;;
      esac], [systemd=auto])



# systemd support
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if test x$enable_systemd = xno ; then
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    have_systemd=no;
else
    PKG_CHECK_MODULES(SYSTEMD,
        [libsystemd-daemon],
        have_systemd=yes,
        have_systemd=no)
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    if test x$have_systemd=xno; then
        AC_MSG_NOTICE([Okay, checking for systemd a different way...])
        PKG_CHECK_MODULES(SYSTEMD,
            [libsystemd],
            have_systemd=yes,
            have_systemd=no)
    fi
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fi

if test x$have_systemd = xyes; then
    AC_DEFINE(HAVE_SYSTEMD,1,[Have systemd])
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    TOR_SYSTEMD_CFLAGS="${SYSTEMD_CFLAGS}"
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    TOR_SYSTEMD_LIBS="${SYSTEMD_LIBS}"
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    PKG_CHECK_MODULES(LIBSYSTEMD209, [libsystemd >= 209],
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         [AC_DEFINE(HAVE_SYSTEMD_209,1,[Have systemd v209 or more])], [])
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fi
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AC_SUBST(TOR_SYSTEMD_CFLAGS)
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AC_SUBST(TOR_SYSTEMD_LIBS)

if test x$enable_systemd = xyes -a x$have_systemd != xyes ; then
    AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found])
fi

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case $host in
   *-*-solaris* )
     AC_DEFINE(_REENTRANT, 1, [Define on some platforms to activate x_r() functions in time.h])
     ;;
esac

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AC_ARG_ENABLE(gcc-warnings,
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     AS_HELP_STRING(--enable-gcc-warnings, [enable verbose warnings]))
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AC_ARG_ENABLE(gcc-warnings-advisory,
     AS_HELP_STRING(--enable-gcc-warnings-advisory, [enable verbose warnings, excluding -Werror]))
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dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
AC_ARG_ENABLE(gcc-hardening,
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    AS_HELP_STRING(--disable-gcc-hardening, [disable compiler security checks]))
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AC_ARG_ENABLE(expensive-hardening,
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    AS_HELP_STRING(--enable-expensive-hardening, [enable more expensive compiler hardening; makes Tor slower]))
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dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
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    AS_HELP_STRING(--disable-linker-hardening, [disable linker security fixups]))
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AC_ARG_ENABLE(local-appdata,
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   AS_HELP_STRING(--enable-local-appdata, [default to host local application data paths on Windows]))
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if test "$enable_local_appdata" = "yes"; then
  AC_DEFINE(ENABLE_LOCAL_APPDATA, 1,
            [Defined if we default to host local appdata paths on Windows])
fi

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# Tor2web mode flag
AC_ARG_ENABLE(tor2web-mode,
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     AS_HELP_STRING(--enable-tor2web-mode, [support tor2web non-anonymous mode]),
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[if test x$enableval = xyes; then
    CFLAGS="$CFLAGS -D ENABLE_TOR2WEB_MODE=1"
fi])

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AC_ARG_ENABLE(bufferevents,
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     AS_HELP_STRING(--enable-bufferevents, [use Libevent's buffered IO]))
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AC_ARG_ENABLE(tool-name-check,
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     AS_HELP_STRING(--disable-tool-name-check, [check for sanely named toolchain when cross-compiling]))
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AC_ARG_ENABLE(seccomp,
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     AS_HELP_STRING(--disable-seccomp, [do not attempt to use libseccomp]))
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AC_ARG_ENABLE(libscrypt,
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     AS_HELP_STRING(--disable-libscrypt, [do not attempt to use libscrypt]))
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dnl check for the correct "ar" when cross-compiling
AN_MAKEVAR([AR], [AC_PROG_AR])
AN_PROGRAM([ar], [AC_PROG_AR])
AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([AR], [ar], [ar])])
AC_PROG_AR

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dnl Check whether the above macro has settled for a simply named tool even
dnl though we're cross compiling. We must do this before running AC_PROG_CC,
dnl because that will find any cc on the system, not only the cross-compiler,
dnl and then verify that a binary built with this compiler runs on the
dnl build system. It will then come to the false conclusion that we're not
dnl cross-compiling.
if test x$enable_tool_name_check != xno; then
    if test x$ac_tool_warned = xyes; then
        AC_MSG_ERROR([We are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
	elif test "x$ac_ct_AR" != x -a x$cross_compiling = xmaybe; then
		AC_MSG_ERROR([We think we are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
	fi
fi

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AC_PROG_CC
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AC_PROG_CPP
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AC_PROG_MAKE_SET
AC_PROG_RANLIB
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AC_PATH_PROG([PERL], [perl])

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dnl autoconf 2.59 appears not to support AC_PROG_SED
AC_CHECK_PROG([SED],[sed],[sed],[/bin/false])
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dnl check for asciidoc and a2x
AC_PATH_PROG([ASCIIDOC], [asciidoc], none)
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AC_PATH_PROGS([A2X], [a2x a2x.py], none)
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AM_CONDITIONAL(USE_ASCIIDOC, test x$asciidoc = xtrue)
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AM_CONDITIONAL(USE_FW_HELPER, test x$natpmp = xtrue || test x$upnp = xtrue)
AM_CONDITIONAL(NAT_PMP, test x$natpmp = xtrue)
AM_CONDITIONAL(MINIUPNPC, test x$upnp = xtrue)
AM_PROG_CC_C_O
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AC_PROG_CC_C99
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AC_ARG_VAR([PYTHON], [path to Python binary])
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AC_CHECK_PROGS(PYTHON, [python python2 python2.7 python3 python3.3])
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if test "x$PYTHON" = "x"; then
  AC_MSG_WARN([Python unavailable; some tests will not be run.])
fi
AM_CONDITIONAL(USEPYTHON, [test "x$PYTHON" != "x"])

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ifdef([AC_C_FLEXIBLE_ARRAY_MEMBER], [
AC_C_FLEXIBLE_ARRAY_MEMBER
], [
 dnl Maybe we've got an old autoconf...
 AC_CACHE_CHECK([for flexible array members],
     tor_cv_c_flexarray,
     [AC_COMPILE_IFELSE(
       AC_LANG_PROGRAM([
 struct abc { int a; char b[]; };
], [
 struct abc *def = malloc(sizeof(struct abc)+sizeof(char));
 def->b[0] = 33;
]),
  [tor_cv_c_flexarray=yes],
  [tor_cv_c_flexarray=no])])
 if test $tor_cv_flexarray = yes ; then
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   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
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 else
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   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [1], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
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 fi
])

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AC_CACHE_CHECK([for working C99 mid-block declaration syntax],
      tor_cv_c_c99_decl,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([], [int x; x = 3; int y; y = 4 + x;])],
	 [tor_cv_c_c99_decl=yes],
	 [tor_cv_c_c99_decl=no] )])
if test "$tor_cv_c_c99_decl" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 mid-block declarations. This is required as of Tor 0.2.6.x])
fi

AC_CACHE_CHECK([for working C99 designated initializers],
      tor_cv_c_c99_designated_init,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([struct s { int a; int b; };],
  	       [[ struct s ss = { .b = 5, .a = 6 }; ]])],
	 [tor_cv_c_c99_designated_init=yes],
	 [tor_cv_c_c99_designated_init=no] )])

if test "$tor_cv_c_c99_designated_init" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 designated initializers. This is required as of Tor 0.2.6.x])
fi

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TORUSER=_tor
AC_ARG_WITH(tor-user,
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        AS_HELP_STRING(--with-tor-user=NAME, [specify username for tor daemon]),
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        [
           TORUSER=$withval
        ]
)
AC_SUBST(TORUSER)

TORGROUP=_tor
AC_ARG_WITH(tor-group,
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        AS_HELP_STRING(--with-tor-group=NAME, [specify group name for tor daemon]),
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        [
           TORGROUP=$withval
        ]
)
AC_SUBST(TORGROUP)

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dnl If _WIN32 is defined and non-zero, we are building for win32
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AC_MSG_CHECKING([for win32])
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AC_RUN_IFELSE([AC_LANG_SOURCE([
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int main(int c, char **v) {
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#ifdef _WIN32
#if _WIN32
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  return 0;
#else
  return 1;
#endif
#else
  return 2;
#endif
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}])],
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bwin32=true; AC_MSG_RESULT([yes]),
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bwin32=false; AC_MSG_RESULT([no]),
bwin32=cross; AC_MSG_RESULT([cross])
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)

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if test "$bwin32" = cross; then
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AC_MSG_CHECKING([for win32 (cross)])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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#ifdef _WIN32
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int main(int c, char **v) {return 0;}
#else
#error
int main(int c, char **v) {return x(y);}
#endif
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])],
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bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]))
fi

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AM_CONDITIONAL(BUILD_NT_SERVICES, test x$bwin32 = xtrue)
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dnl Enable C99 when compiling with MIPSpro
AC_MSG_CHECKING([for MIPSpro compiler])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [
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#if (defined(__sgi) && defined(_COMPILER_VERSION))
#error
  return x(y);
#endif
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])],
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bmipspro=false; AC_MSG_RESULT(no),
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bmipspro=true; AC_MSG_RESULT(yes))
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if test "$bmipspro" = true; then
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  CFLAGS="$CFLAGS -c99"
fi

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AC_C_BIGENDIAN

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AC_SEARCH_LIBS(socket, [socket network])
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AC_SEARCH_LIBS(gethostbyname, [nsl])
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AC_SEARCH_LIBS(dlopen, [dl])
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AC_SEARCH_LIBS(inet_aton, [resolv])
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saved_LIBS="$LIBS"
AC_SEARCH_LIBS([clock_gettime], [rt])
if test "$LIBS" != "$saved_LIBS"; then
   # Looks like we need -lrt for clock_gettime().
   have_rt=yes
fi
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AC_SEARCH_LIBS(pthread_create, [pthread])
AC_SEARCH_LIBS(pthread_detach, [pthread])
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AM_CONDITIONAL(THREADS_WIN32, test "$bwin32" = "true")
AM_CONDITIONAL(THREADS_PTHREADS, test "$bwin32" = "false")
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dnl -------------------------------------------------------------------
dnl Check for functions before libevent, since libevent-1.2 apparently
dnl exports strlcpy without defining it in a header.

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AC_CHECK_FUNCS(
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        _NSGetEnviron \
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        accept4 \
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        backtrace \
        backtrace_symbols_fd \
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        clock_gettime \
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	eventfd \
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        flock \
        ftime \
        getaddrinfo \
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        getifaddrs \
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        getrlimit \
        gettimeofday \
        gmtime_r \
        inet_aton \
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        ioctl \
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        issetugid \
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        llround \
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        localtime_r \
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        lround \
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        memmem \
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	pipe \
	pipe2 \
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        prctl \
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        rint \
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        sigaction \
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        socketpair \
        strlcat \
        strlcpy \
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	strnlen \
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        strptime \
        strtok_r \
        strtoull \
        sysconf \
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	sysctl \
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        uname \
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	usleep \
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        vasprintf \
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	_vscprintf
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)
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if test "$bwin32" != true; then
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  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_FUNCS(pthread_create)
fi

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dnl ------------------------------------------------------
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dnl Where do you live, libevent?  And how do we call you?
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if test "$bwin32" = true; then
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  TOR_LIB_WS32=-lws2_32
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  TOR_LIB_IPHLPAPI=-liphlpapi
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  # Some of the cargo-cults recommend -lwsock32 as well, but I don't
  # think it's actually necessary.
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  TOR_LIB_GDI=-lgdi32
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else
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  TOR_LIB_WS32=
  TOR_LIB_GDI=
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fi
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AC_SUBST(TOR_LIB_WS32)
AC_SUBST(TOR_LIB_GDI)
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AC_SUBST(TOR_LIB_IPHLPAPI)
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tor_libevent_pkg_redhat="libevent"
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tor_libevent_pkg_debian="libevent-dev"
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tor_libevent_devpkg_redhat="libevent-devel"
tor_libevent_devpkg_debian="libevent-dev"

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dnl On Gnu/Linux or any place we require it, we'll add librt to the Libevent
dnl linking for static builds.
STATIC_LIBEVENT_FLAGS=""
if test "$enable_static_libevent" = "yes"; then
    if test "$have_rt" = yes; then
      STATIC_LIBEVENT_FLAGS=" -lrt "
    fi
fi

TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <event.h>], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
void exit(int); void *event_init(void);],
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    [
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#ifdef _WIN32
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{WSADATA d; WSAStartup(0x101,&d); }
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#endif
event_init(); exit(0);
], [--with-libevent-dir], [/opt/libevent])
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dnl Now check for particular libevent functions.
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save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
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save_CPPFLAGS="$CPPFLAGS"
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LIBS="-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32 $LIBS"
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LDFLAGS="$TOR_LDFLAGS_libevent $LDFLAGS"
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CPPFLAGS="$TOR_CPPFLAGS_libevent $CPPFLAGS"
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AC_CHECK_FUNCS([event_get_version_number \
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                evutil_secure_rng_set_urandom_device_file \
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                evutil_secure_rng_init \
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               ])
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AC_CHECK_MEMBERS([struct event.min_heap_idx], , ,
[#include <event.h>
])

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AC_CHECK_HEADERS(event2/event.h event2/dns.h event2/bufferevent_ssl.h)
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LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
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CPPFLAGS="$save_CPPFLAGS"
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AM_CONDITIONAL(USE_EXTERNAL_EVDNS, test x$ac_cv_header_event2_dns_h = xyes)

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if test "$enable_static_libevent" = "yes"; then
   if test "$tor_cv_library_libevent_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-libevent-dir=x option when using --enable-static-libevent")
   else
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     TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent.a $STATIC_LIBEVENT_FLAGS"
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   fi
else
     TOR_LIBEVENT_LIBS="-levent"
fi

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dnl This isn't the best test for Libevent 2.0.3-alpha.  Once it's released,
dnl we can do much better.
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if test "$enable_bufferevents" = "yes" ; then
  if test "$ac_cv_header_event2_bufferevent_ssl_h" != "yes" ; then
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    AC_MSG_ERROR([You've asked for bufferevent support, but you're using a version of Libevent without SSL support.  This won't work.  We need Libevent 2.0.8-rc or later, and you don't seem to even have Libevent 2.0.3-alpha.])
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  else

    CPPFLAGS="$CPPFLAGS $TOR_CPPFLAGS_libevent"

    # Check for the right version.  First see if version detection works.
    AC_MSG_CHECKING([whether we can detect the Libevent version])
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    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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#include <event2/event.h>
#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 10
#error
int x = y(zz);
#else
int x = 1;
#endif
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  ])], [event_version_number_works=yes; AC_MSG_RESULT([yes]) ],
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     [event_version_number_works=no;  AC_MSG_RESULT([no])])
    if test "$event_version_number_works" != 'yes'; then
      AC_MSG_WARN([Version detection on Libevent seems broken.  Your Libevent installation is probably screwed up or very old.])
    else
      AC_MSG_CHECKING([whether Libevent is new enough for bufferevents])
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      AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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#include <event2/event.h>
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#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 0x02000d00
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#error
int x = y(zz);
#else
int x = 1;
#endif
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   ])], [ AC_MSG_RESULT([yes]) ],
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      [ AC_MSG_RESULT([no])
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        AC_MSG_ERROR([Libevent does not seem new enough to support bufferevents.  We require 2.0.13-stable or later]) ] )
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    fi
  fi
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fi

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LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

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AM_CONDITIONAL(USE_BUFFEREVENTS, test "$enable_bufferevents" = "yes")
if test "$enable_bufferevents" = "yes"; then
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  AC_DEFINE(USE_BUFFEREVENTS, 1, [Defined if we're going to use Libevent's buffered IO API])
  if test "$enable_static_libevent" = "yes"; then
    TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent_openssl.a $TOR_LIBEVENT_LIBS"
  else
    TOR_LIBEVENT_LIBS="-levent_openssl $TOR_LIBEVENT_LIBS"
  fi
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fi
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AC_SUBST(TOR_LIBEVENT_LIBS)
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dnl ------------------------------------------------------
dnl Where do you live, libm?

dnl On some platforms (Haiku/BeOS) the math library is
dnl part of libroot. In which case don't link against lm
TOR_LIB_MATH=""
save_LIBS="$LIBS"
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AC_SEARCH_LIBS(pow, [m], , AC_MSG_ERROR([Could not find pow in libm or libc.]))
if test "$ac_cv_search_pow" != "none required"; then
    TOR_LIB_MATH="$ac_cv_search_pow"
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fi
LIBS="$save_LIBS"
AC_SUBST(TOR_LIB_MATH)

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dnl ------------------------------------------------------
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dnl Where do you live, openssl?  And how do we call you?
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tor_openssl_pkg_redhat="openssl"
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tor_openssl_pkg_debian="libssl-dev"
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tor_openssl_devpkg_redhat="openssl-devel"
tor_openssl_devpkg_debian="libssl-dev"

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ALT_openssl_WITHVAL=""
AC_ARG_WITH(ssl-dir,
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  AS_HELP_STRING(--with-ssl-dir=PATH, [obsolete alias for --with-openssl-dir]),
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  [
      if test "x$withval" != xno && test "x$withval" != "x" ; then
         ALT_openssl_WITHVAL="$withval"
      fi
  ])

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TOR_SEARCH_LIBRARY(openssl, $tryssldir, [-lssl -lcrypto $TOR_LIB_GDI],
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    [#include <openssl/rand.h>],
    [void RAND_add(const void *buf, int num, double entropy);],
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    [RAND_add((void*)0,0,0); exit(0);], [],
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    [/usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /usr/athena /opt/openssl])
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dnl XXXX check for OPENSSL_VERSION_NUMBER == SSLeay()

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if test "$enable_static_openssl" = "yes"; then
   if test "$tor_cv_library_openssl_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-openssl-dir=x option when using --enable-static-openssl")
   else
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     TOR_OPENSSL_LIBS="$TOR_LIBDIR_openssl/libssl.a $TOR_LIBDIR_openssl/libcrypto.a"
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   fi
else
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     TOR_OPENSSL_LIBS="-lssl -lcrypto"
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fi
AC_SUBST(TOR_OPENSSL_LIBS)

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AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])

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dnl ------------------------------------------------------
dnl Where do you live, zlib?  And how do we call you?

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tor_zlib_pkg_redhat="zlib"
tor_zlib_pkg_debian="zlib1g"
tor_zlib_devpkg_redhat="zlib-devel"
tor_zlib_devpkg_debian="zlib1g-dev"
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TOR_SEARCH_LIBRARY(zlib, $tryzlibdir, [-lz],
    [#include <zlib.h>],
    [const char * zlibVersion(void);],
    [zlibVersion(); exit(0);], [--with-zlib-dir],
    [/opt/zlib])

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if test "$enable_static_zlib" = "yes"; then
   if test "$tor_cv_library_zlib_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-zlib-dir=x option when
 using --enable-static-zlib")
   else
     TOR_ZLIB_LIBS="$TOR_LIBDIR_zlib/libz.a"
   fi
else
     TOR_ZLIB_LIBS="-lz"
fi
AC_SUBST(TOR_ZLIB_LIBS)

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dnl ---------------------------------------------------------------------
dnl Now that we know about our major libraries, we can check for compiler
dnl and linker hardening options.  We need to do this with the libraries known,
dnl since sometimes the linker will like an option but not be willing to
dnl use it with a build of a library.
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all_ldflags_for_check="$TOR_LDFLAGS_zlib $TOR_LDFLAGS_openssl $TOR_LDFLAGS_libevent"
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all_libs_for_check="$TOR_ZLIB_LIBS $TOR_LIB_MATH $TOR_LIBEVENT_LIBS $TOR_OPENSSL_LIBS $TOR_SYSTEMD_LIBS $TOR_LIB_WS32 $TOR_LIB_GDI"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
#endif])], have_clang=yes, have_clang=no)

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if test x$enable_gcc_hardening != xno; then
    CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
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    if test x$have_clang = xyes; then
        TOR_CHECK_CFLAGS(-Qunused-arguments)
    fi
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    TOR_CHECK_CFLAGS(-fstack-protector-all, also_link)
    AS_VAR_PUSHDEF([can_compile], [tor_cv_cflags_-fstack-protector-all])
    AS_VAR_PUSHDEF([can_link], [tor_can_link_-fstack-protector-all])
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m4_ifdef([AS_VAR_IF],[
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    AS_VAR_IF(can_compile, [yes],
        AS_VAR_IF(can_link, [yes],
                  [],
                  AC_MSG_ERROR([We tried to build with stack protection; it looks like your compiler supports it but your libc does not provide it. Are you missing libssp? (You can --disable-gcc-hardening to ignore this error.)]))
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        )])
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    AS_VAR_POPDEF([can_link])
    AS_VAR_POPDEF([can_compile])
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    TOR_CHECK_CFLAGS(-Wstack-protector)
    TOR_CHECK_CFLAGS(-fwrapv)
    TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
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    if test "$bwin32" = "false"; then
       TOR_CHECK_CFLAGS(-fPIE)
       TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
    fi
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fi
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if test x$enable_expensive_hardening = xyes ; then
   TOR_CHECK_CFLAGS([-fsanitize=address])
   TOR_CHECK_CFLAGS([-fsanitize=undefined])
   TOR_CHECK_CFLAGS([-fno-omit-frame-pointer])
fi

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if test x$enable_linker_hardening != xno; then
    TOR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
fi
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# For backtrace support
TOR_CHECK_LDFLAGS(-rdynamic)

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dnl ------------------------------------------------------
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dnl Now see if we have a -fomit-frame-pointer compiler option.

saved_CFLAGS="$CFLAGS"
TOR_CHECK_CFLAGS(-fomit-frame-pointer)
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F_OMIT_FRAME_POINTER=''
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if test "$saved_CFLAGS" != "$CFLAGS"; then
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  if test x$enable_expensive_hardening != xyes ; then
    F_OMIT_FRAME_POINTER='-fomit-frame-pointer'
  fi
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fi
CFLAGS="$saved_CFLAGS"
AC_SUBST(F_OMIT_FRAME_POINTER)

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dnl ------------------------------------------------------
dnl If we are adding -fomit-frame-pointer (or if the compiler's doing it
dnl for us, as GCC 4.6 and later do at many optimization levels), then
dnl we should try to add -fasynchronous-unwind-tables so that our backtrace
dnl code will work.
TOR_CHECK_CFLAGS(-fasynchronous-unwind-tables)

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dnl ------------------------------------------------------
dnl Where do you live, libnatpmp?  And how do we call you?
dnl There are no packages for Debian or Redhat as of this patch

if test "$natpmp" = "true"; then
    AC_DEFINE(NAT_PMP, 1, [Define to 1 if we are building with nat-pmp.])
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    TOR_SEARCH_LIBRARY(libnatpmp, $trylibnatpmpdir, [-lnatpmp $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
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        [#include <natpmp.h>],
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        [#ifdef _WIN32
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         #define STATICLIB
         #endif
         #include <natpmp.h>],
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        [   int r;
            natpmp_t natpmp;
            natpmpresp_t response;
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            r = initnatpmp(&natpmp, 0, 0);],
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            [printf("initnatpmp() returned %d (%s)\n", r, r?"FAILED":"SUCCESS");
            exit(0);],
        [--with-libnatpmp-dir],
        [/usr/lib/])
fi


dnl ------------------------------------------------------
dnl Where do you live, libminiupnpc?  And how do we call you?
dnl There are no packages for Debian or Redhat as of this patch

if test "$upnp" = "true"; then
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    AC_DEFINE(MINIUPNPC, 1, [Define to 1 if we are building with UPnP.])
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    dnl Before we call TOR_SEARCH_LIBRARY we'll do a quick compile test
    dnl to see if we have miniupnpc-1.5 or -1.6
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <miniupnpc/miniupnpc.h>],
        [upnpDiscover(1, 0, 0, 0);exit(0);])],[miniupnpc15="true"],[miniupnpc15="false"])

    if test "$miniupnpc15" = "true" ; then
        AC_DEFINE([MINIUPNPC15],[1],[libminiupnpc version 1.5 found])
        TOR_SEARCH_LIBRARY(libminiupnpc, $trylibminiupnpcdir, [-lminiupnpc $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
            [#include <miniupnpc/miniwget.h>
             #include <miniupnpc/miniupnpc.h>
             #include <miniupnpc/upnpcommands.h>],
            [void upnpDiscover(int delay, const char * multicastif,
             const char * minissdpdsock, int sameport);],
            [upnpDiscover(1, 0, 0, 0); exit(0);],
            [--with-libminiupnpc-dir],
            [/usr/lib/])
    else
        TOR_SEARCH_LIBRARY(libminiupnpc, $trylibminiupnpcdir, [-lminiupnpc $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
            [#include <miniupnpc/miniwget.h>
             #include <miniupnpc/miniupnpc.h>
             #include <miniupnpc/upnpcommands.h>],
            [void upnpDiscover(int delay, const char * multicastif,
             const char * minissdpdsock, int sameport, int ipv6, int * error);],
            [upnpDiscover(1, 0, 0, 0, 0, 0); exit(0);],
            [--with-libminiupnpc-dir],
            [/usr/lib/])
    fi
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fi

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dnl ============================================================
dnl Check for libseccomp

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if test "x$enable_seccomp" != "xno"; then
  AC_CHECK_HEADERS([seccomp.h])
  AC_SEARCH_LIBS(seccomp_init, [seccomp])
fi
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dnl ============================================================
dnl Check for libscrypt

if test "x$enable_libscrypt" != "xno"; then
  AC_CHECK_HEADERS([libscrypt.h])
  AC_SEARCH_LIBS(libscrypt_scrypt, [scrypt])
fi

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dnl ============================================================
dnl We need an implementation of curve25519.

dnl set these defaults.
build_curve25519_donna=no
build_curve25519_donna_c64=no
use_curve25519_donna=no
use_curve25519_nacl=no
CURVE25519_LIBS=

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dnl The best choice is using curve25519-donna-c64, but that requires
dnl that we
AC_CACHE_CHECK([whether we can use curve25519-donna-c64],
  tor_cv_can_use_curve25519_donna_c64,
  [AC_RUN_IFELSE(
    [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
                   ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
  [tor_cv_can_use_curve25519_donna_c64=yes],
      [tor_cv_can_use_curve25519_donna_c64=no],
  [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
    	         ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
          [tor_cv_can_use_curve25519_donna_c64=cross],
      [tor_cv_can_use_curve25519_donna_c64=no])])])

AC_CHECK_HEADERS([crypto_scalarmult_curve25519.h \
                  nacl/crypto_scalarmult_curve25519.h])

AC_CACHE_CHECK([for nacl compiled with a fast curve25519 implementation],
  tor_cv_can_use_curve25519_nacl,
  [tor_saved_LIBS="$LIBS"
   LIBS="$LIBS -lnacl"
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM([dnl
       #ifdef HAVE_CRYPTO_SCALARMULT_CURVE25519_H
       #include <crypto_scalarmult_curve25519.h>
   #elif defined(HAVE_NACL_CRYPTO_SCALARMULT_CURVE25519_H)
   #include <nacl/crypto_scalarmult_curve25519.h>
   #endif
       #ifdef crypto_scalarmult_curve25519_ref_BYTES
   #error Hey, this is the reference implementation! That's not fast.
   #endif
     ], [
   unsigned char *a, *b, *c; crypto_scalarmult_curve25519(a,b,c);
     ])], [tor_cv_can_use_curve25519_nacl=yes],
     [tor_cv_can_use_curve25519_nacl=no])
   LIBS="$tor_saved_LIBS" ])

 dnl Okay, now we need to figure out which one to actually use. Fall back
 dnl to curve25519-donna.c

 if test x$tor_cv_can_use_curve25519_donna_c64 != xno; then
   build_curve25519_donna_c64=yes
   use_curve25519_donna=yes
 elif test x$tor_cv_can_use_curve25519_nacl = xyes; then
   use_curve25519_nacl=yes
   CURVE25519_LIBS=-lnacl
 else
   build_curve25519_donna=yes
   use_curve25519_donna=yes
 fi
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if test x$use_curve25519_donna = xyes; then
  AC_DEFINE(USE_CURVE25519_DONNA, 1,
            [Defined if we should use an internal curve25519_donna{,_c64} implementation])
fi
if test x$use_curve25519_nacl = xyes; then
  AC_DEFINE(USE_CURVE25519_NACL, 1,
            [Defined if we should use a curve25519 from nacl])
fi
AM_CONDITIONAL(BUILD_CURVE25519_DONNA, test x$build_curve25519_donna = xyes)
AM_CONDITIONAL(BUILD_CURVE25519_DONNA_C64, test x$build_curve25519_donna_c64 = xyes)
AC_SUBST(CURVE25519_LIBS)

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dnl Make sure to enable support for large off_t if available.
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AC_SYS_LARGEFILE

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AC_CHECK_HEADERS(
        assert.h \
        errno.h \
        fcntl.h \
        signal.h \
        string.h \
        sys/fcntl.h \
        sys/stat.h \
        sys/time.h \
        sys/types.h \
        time.h \
        unistd.h
 , , AC_MSG_WARN(Some headers were not found, compilation may fail.  If compilation succeeds, please send your orconfig.h to the developers so we can fix this warning.))
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dnl These headers are not essential

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AC_CHECK_HEADERS(
        arpa/inet.h \
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        crt_externs.h \
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        execinfo.h \
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        grp.h \
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        ifaddrs.h \
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        inttypes.h \
        limits.h \
        linux/types.h \
        machine/limits.h \
        malloc.h \
        malloc/malloc.h \
        malloc_np.h \
        netdb.h \
        netinet/in.h \
        netinet/in6.h \
        pwd.h \
        stdint.h \
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	sys/eventfd.h \
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        sys/file.h \
        sys/ioctl.h \
        sys/limits.h \
        sys/mman.h \
        sys/param.h \
        sys/prctl.h \
        sys/resource.h \
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	sys/sysctl.h \
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        sys/syslimits.h \
        sys/time.h \
        sys/types.h \
        sys/un.h \
        sys/utime.h \
        sys/wait.h \
        syslog.h \
        utime.h
)
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AC_CHECK_HEADERS(sys/param.h)

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[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
#endif])
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#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
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#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
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#endif])
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AC_CHECK_HEADERS(linux/if.h,[],[],
[
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])

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#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
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#endif
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#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LINUX_TYPES_H
#include <linux/types.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
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#include <netinet/in.h>
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#endif])
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AC_CHECK_HEADERS(linux/netfilter_ipv6/ip6_tables.h,
        linux_netfilter_ipv6_ip6_tables=1, linux_netfilter_ipv6_ip6_tables=0,
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LINUX_TYPES_H
#include <linux/types.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_LINUX_IF_H
#include <linux/if.h>
#endif])

1023
1024
if test x$transparent = xtrue ; then
   transparent_ok=0
1025
   if test x$net_if_found = x1 && test x$net_pfvar_found = x1 ; then
1026
1027
1028
1029
1030
     transparent_ok=1
   fi
   if test x$linux_netfilter_ipv4 = x1 ; then
     transparent_ok=1
   fi
1031
1032
1033
   if test x$linux_netfilter_ipv6_ip6_tables = x1 ; then
     transparent_ok=1
   fi
1034
   if test x$transparent_ok = x1 ; then
1035
1036
     AC_DEFINE(USE_TRANSPARENT, 1, "Define to enable transparent proxy support")
     case $host in
1037
       *-*-openbsd* | *-*-bitrig*)
1038
1039
1040
1041
1042
1043
1044
         AC_DEFINE(OPENBSD, 1, "Define to handle pf on OpenBSD properly") ;;
     esac
   else
     AC_MSG_NOTICE([Transparent proxy support enabled, but missing headers.])
   fi
fi

1045
1046
1047
1048
1049
1050
1051
AC_CHECK_MEMBERS([struct timeval.tv_sec], , ,
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif])
1052

1053
1054
1055
dnl In case we aren't given a working stdint.h, we'll need to grow our own.
dnl Watch out.

1056
1057
1058
1059
1060
1061
1062
1063
AC_CHECK_SIZEOF(int8_t)
AC_CHECK_SIZEOF(int16_t)
AC_CHECK_SIZEOF(int32_t)
AC_CHECK_SIZEOF(int64_t)
AC_CHECK_SIZEOF(uint8_t)
AC_CHECK_SIZEOF(uint16_t)
AC_CHECK_SIZEOF(uint32_t)
AC_CHECK_SIZEOF(uint64_t)
1064
1065
AC_CHECK_SIZEOF(intptr_t)
AC_CHECK_SIZEOF(uintptr_t)
1066

1067
dnl AC_CHECK_TYPES([int8_t, int16_t, int32_t, int64_t, uint8_t, uint16_t, uint32_t, uint64_t, intptr_t, uintptr_t])
1068

1069
1070
1071
1072
1073
1074
AC_CHECK_SIZEOF(char)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(__int64)
1075
AC_CHECK_SIZEOF(void *)
1076
AC_CHECK_SIZEOF(time_t)
1077
AC_CHECK_SIZEOF(size_t)
1078
AC_CHECK_SIZEOF(pid_t)
1079

1080
AC_CHECK_TYPES([uint, u_char, ssize_t])
1081

1082
1083
AC_PC_FROM_UCONTEXT([/bin/true])

1084
1085
dnl used to include sockaddr_storage, but everybody has that.
AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, sa_family_t], , ,
1086
1087
1088
1089
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
1090
1091
1092
1093
1094
1095
1096
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
1097
#endif
1098
#ifdef _WIN32
1099
#define _WIN32_WINNT 0x0501
1100
1101
1102
1103
1104
1105
1106
1107
1108
#define WIN32_LEAN_AND_MEAN
#if defined(_MSC_VER) && (_MSC_VER < 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
])
1109
AC_CHECK_MEMBERS([struct in6_addr.s6_addr32, struct in6_addr.s6_addr16, struct sockaddr_in.sin_len, struct sockaddr_in6.sin6_len], , ,
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
1122
#ifdef _WIN32
1123
#define _WIN32_WINNT 0x0501
1124
1125
1126
1127
1128
1129
1130
1131
1132
#define WIN32_LEAN_AND_MEAN
#if defined(_MSC_VER) && (_MSC_VER < 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
])
1133

1134
AC_CHECK_TYPES([rlim_t], , ,
1135
1136
1137
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
1138
1139
1140
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
1141
#ifdef HAVE_SYS_RESOURCE_H
1142
1143
1144
1145
#include <sys/resource.h>
#endif
])

1146
1147
1148
AX_CHECK_SIGN([time_t],
       [ AC_DEFINE(TIME_T_IS_SIGNED, 1, [Define if time_t is signed]) ],
       [ : ], [
1149
1150
1151
1152
1153
1154
1155
1156
1157
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
1158
])
1159

1160
1161
1162
1163
if test "$ax_cv_decl_time_t_signed" = no; then
  AC_MSG_WARN([You have an unsigned time_t; some things will probably break. Please tell the Tor developers about your interesting platform.])
fi

1164
1165
1166
AX_CHECK_SIGN([size_t],
       [ tor_cv_size_t_signed=yes ],
       [ tor_cv_size_t_signed=no ], [
1167
1168
1169
1170
1171
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
])

1172
if test "$ax_cv_decl_size_t_signed" = yes; then
1173
1174
1175
  AC_MSG_ERROR([You have a signed size_t; that's grossly nonconformant.])
fi

1176
1177
1178
1179
1180
1181
AX_CHECK_SIGN([enum always],
       [ AC_DEFINE(ENUM_VALS_ARE_SIGNED, 1, [Define if enum is always signed]) ],
       [ : ], [
 enum always { AAA, BBB, CCC };
])

1182
1183
1184
1185
1186
AC_CHECK_SIZEOF(socklen_t, , [AC_INCLUDES_DEFAULT()
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])
1187

1188
1189
1190
1191
# We want to make sure that we _don't_ have a cell_t defined, like IRIX does.

AC_CHECK_SIZEOF(cell_t)

1192
1193
1194
1195
# Now make sure that NULL can be represented as zero bytes.
AC_CACHE_CHECK([whether memset(0) sets pointers to NULL], tor_cv_null_is_zero,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[#include <stdlib.h>
1196
#include <string.h>
1197
1198
1199
1200
#include <stdio.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
1201
int main () { char *p1,*p2; p1=NULL; memset(&p2,0,sizeof(p2));
1202
return memcmp(&p1,&p2,sizeof(char*))?1:0; }]])],
1203
1204
1205
1206
       [tor_cv_null_is_zero=yes],
       [tor_cv_null_is_zero=no],
       [tor_cv_null_is_zero=cross])])

1207
if test "$tor_cv_null_is_zero" = cross ; then
1208
1209
1210
1211
  # Cross-compiling; let's hope that the target isn't raving mad.
  AC_MSG_NOTICE([Cross-compiling: we'll assume that NULL is represented as a sequence of 0-valued bytes.])
fi

1212
if test "$tor_cv_null_is_zero" != no; then
1213
1214
1215
1216
  AC_DEFINE([NULL_REP_IS_ZERO_BYTES], 1,
            [Define to 1 iff memset(0) sets pointers to NULL])
fi

1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
AC_CACHE_CHECK([whether memset(0) sets doubles to 0.0], tor_cv_dbl0_is_zero,