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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) 2007-2019, The Tor Project, Inc.
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dnl See LICENSE for licensing information
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AC_PREREQ([2.63])
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AC_INIT([tor],[0.4.5.0-alpha-dev])
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AC_CONFIG_SRCDIR([src/app/main/tor_main.c])
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AC_CONFIG_MACRO_DIR([m4])
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configure_flags="$*"

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# DO NOT EDIT THIS DEFINITION BY HAND UNLESS YOU KNOW WHAT YOU'RE DOING.
#
# The update_versions.py script updates this definition when the
# version number changes.  Tor uses it to make sure that it
# only shuts down for missing "required protocols" when those protocols
# are listed as required by a consensus after this date.
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AC_DEFINE(APPROX_RELEASE_DATE, ["2020-06-09"], # for 0.4.5.0-alpha-dev
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          [Approximate date when this software was released. (Updated when the version changes.)])

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# "foreign" means we don't follow GNU package layout standards
# "1.11" means we require automake version 1.11 or newer
# "subdir-objects" means put .o files in the same directory as the .c files
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AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects -Wall -Werror])
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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_USE_SYSTEM_EXTENSIONS
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AC_CANONICAL_HOST

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PKG_PROG_PKG_CONFIG
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if test "x$PKG_CONFIG" = "x" ; then
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    pkg_config_user_action="install pkg-config, and check the PKG_CONFIG_PATH environment variable"
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    AC_MSG_NOTICE([Some libraries need pkg-config, including systemd, nss, lzma, zstd, and custom mallocs.])
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    AC_MSG_NOTICE([To use those libraries, $pkg_config_user_action.])
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else
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    pkg_config_user_action="check the PKG_CONFIG_PATH environment variable"
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fi
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if test "x$PKG_CONFIG_PATH" = "x" && test "x$prefix" != "xNONE" && test "$host" != "$build"; then
   export PKG_CONFIG_PATH=$prefix/lib/pkgconfig
   AC_MSG_NOTICE([set PKG_CONFIG_PATH=$PKG_CONFIG_PATH to support cross-compiling])
fi

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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. Deprecated: see --with-malloc]))
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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(asserts-in-tests,
   AS_HELP_STRING(--disable-asserts-in-tests, [disable tor_assert() calls in the unit tests, for branch coverage]))
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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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AC_ARG_ENABLE(libfuzzer,
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   AS_HELP_STRING(--enable-libfuzzer, [build extra fuzzers based on 'libfuzzer']))
AC_ARG_ENABLE(oss-fuzz,
   AS_HELP_STRING(--enable-oss-fuzz, [build extra fuzzers based on 'oss-fuzz' environment]))
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AC_ARG_ENABLE(memory-sentinels,
   AS_HELP_STRING(--disable-memory-sentinels, [disable code that tries to prevent some kinds of memory access bugs. For fuzzing only.]))
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AC_ARG_ENABLE(rust,
   AS_HELP_STRING(--enable-rust, [enable rust integration]))
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AC_ARG_ENABLE(cargo-online-mode,
   AS_HELP_STRING(--enable-cargo-online-mode, [Allow cargo to make network requests to fetch crates. For builds with rust only.]))
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AC_ARG_ENABLE(restart-debugging,
   AS_HELP_STRING(--enable-restart-debugging, [Build Tor with support for debugging in-process restart. Developers only.]))
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AC_ARG_ENABLE(zstd-advanced-apis,
   AS_HELP_STRING(--disable-zstd-advanced-apis, [Build without support for zstd's "static-only" APIs.]))
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AC_ARG_ENABLE(nss,
   AS_HELP_STRING(--enable-nss, [Use Mozilla's NSS TLS library. (EXPERIMENTAL)]))
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AC_ARG_ENABLE(pic,
   AS_HELP_STRING(--enable-pic, [Build Tor's binaries as position-independent code, suitable to link as a library.]))
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AC_ARG_ENABLE(missing-doc-warnings,
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   AS_HELP_STRING(--enable-missing-doc-warnings, [Tell doxygen to warn about missing documentation. Makes doxygen warnings nonfatal.]))
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if test "$enable_missing_doc_warnings" = "yes"; then
   DOXYGEN_FATAL_WARNINGS=NO
   DOXYGEN_WARN_ON_MISSING=YES
elif test "$enable_fatal_warnings" = "yes"; then
   # Fatal warnings from doxygen are nice, but not if we're warning about
   # missing documentation.
   DOXYGEN_FATAL_WARNINGS=YES
   DOXYGEN_WARN_ON_MISSING=NO
else
   DOXYGEN_FATAL_WARNINGS=NO
   DOXYGEN_WARN_ON_MISSING=NO
fi
AC_SUBST(DOXYGEN_FATAL_WARNINGS)
AC_SUBST(DOXYGEN_WARN_ON_MISSING)

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if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
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    AC_MSG_ERROR([Can't disable assertions outside of coverage build])
fi

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AM_CONDITIONAL(UNITTESTS_ENABLED, test "x$enable_unittests" != "xno")
AM_CONDITIONAL(COVERAGE_ENABLED, test "x$enable_coverage" = "xyes")
AM_CONDITIONAL(DISABLE_ASSERTS_IN_UNIT_TESTS, test "x$enable_asserts_in_tests" = "xno")
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AM_CONDITIONAL(LIBFUZZER_ENABLED, test "x$enable_libfuzzer" = "xyes")
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AM_CONDITIONAL(OSS_FUZZ_ENABLED, test "x$enable_oss_fuzz" = "xyes")
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AM_CONDITIONAL(USE_RUST, test "x$enable_rust" = "xyes")
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AM_CONDITIONAL(USE_NSS, test "x$enable_nss" = "xyes")
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AM_CONDITIONAL(USE_OPENSSL, test "x$enable_nss" != "xyes")
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if test "x$enable_nss" = "xyes"; then
  AC_DEFINE(ENABLE_NSS, 1,
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  	    [Defined if we're building with NSS.])
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else
  AC_DEFINE(ENABLE_OPENSSL, 1,
            [Defined if we're building with OpenSSL or LibreSSL])
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fi
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if test "$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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if test "$enable_memory_sentinels" = "no"; then
  AC_DEFINE(DISABLE_MEMORY_SENTINELS, 1,
           [Defined if we're turning off memory safety code to look for bugs])
fi

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AC_ARG_ENABLE(manpage,
              AS_HELP_STRING(--disable-manpage, [Disable manpage generation.]))

AC_ARG_ENABLE(html-manual,
              AS_HELP_STRING(--disable-html-manual, [Disable HTML documentation.]))

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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
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        "yes") asciidoc=true ;;
        "no")  asciidoc=false ;;
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        *) AC_MSG_ERROR(bad value for --disable-asciidoc) ;;
      esac], [asciidoc=true])

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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
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        "yes") systemd=true ;;
        "no")  systemd=false ;;
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        * ) AC_MSG_ERROR(bad value for --enable-systemd) ;;
      esac], [systemd=auto])

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if test "$enable_restart_debugging" = "yes"; then
  AC_DEFINE(ENABLE_RESTART_DEBUGGING, 1,
            [Defined if we're building with support for in-process restart debugging.])
fi
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if test "$enable_zstd_advanced_apis" != "no"; then
   AC_DEFINE(ENABLE_ZSTD_ADVANCED_APIS, 1,
             [Defined if we're going to try to use zstd's "static-only" APIs.])
fi
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# 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
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        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

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if test "x$have_systemd" = "xyes"; then
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    AC_DEFINE(HAVE_SYSTEMD,1,[Have systemd])
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    TOR_SYSTEMD_CFLAGS="${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 greater])], [])
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fi
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AC_SUBST(TOR_SYSTEMD_CFLAGS)
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AC_SUBST(TOR_SYSTEMD_LIBS)

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if test "x$enable_systemd" = "xyes" -a "x$have_systemd" != "xyes" ; then
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    AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found, $pkg_config_user_action, or set SYSTEMD_CFLAGS and SYSTEMD_LIBS.])
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fi

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case "$host" in
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   *-*-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, [deprecated alias for enable-fatal-warnings]))
AC_ARG_ENABLE(fatal-warnings,
     AS_HELP_STRING(--enable-fatal-warnings, [tell the compiler to treat all warnings as errors.]))
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AC_ARG_ENABLE(gcc-warnings-advisory,
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     AS_HELP_STRING(--disable-gcc-warnings-advisory, [disable the regular verbose warnings]))
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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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dnl Deprecated --enable-expensive-hardening but keep it for now for backward compat.
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AC_ARG_ENABLE(expensive-hardening,
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    AS_HELP_STRING(--enable-expensive-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
AC_ARG_ENABLE(fragile-hardening,
    AS_HELP_STRING(--enable-fragile-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
if test "x$enable_expensive_hardening" = "xyes" || test "x$enable_fragile_hardening" = "xyes"; then
  fragile_hardening="yes"
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  AC_DEFINE(DEBUG_SMARTLIST, 1, [Enable smartlist debugging])
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fi
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AC_ARG_ENABLE(all-bugs-are-fatal,
   AS_HELP_STRING(--enable-all-bugs-are-fatal, [force all soft asserts in Tor codebase (tor_assert_nonfatal(), BUG(), etc.) to act as hard asserts (tor_assert() and equivalents); makes Tor fragile; only recommended for dev builds]))

if test "x$enable_all_bugs_are_fatal" = "xyes"; then
  AC_DEFINE(ALL_BUGS_ARE_FATAL, 1, [All assert failures are fatal])
fi

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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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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 --- Tracing Options. ---
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TOR_TRACE_LIBS=

dnl LTTng instrumentation option.
AC_ARG_ENABLE(tracing-instrumentation-lttng,
              AS_HELP_STRING([--enable-tracing-instrumentation-lttng],
                             [build with LTTng-UST instrumentation]))
AM_CONDITIONAL([USE_TRACING_INSTRUMENTATION_LTTNG],
               [test "x$enable_tracing_instrumentation_lttng" = "xyes"])

if test "x$enable_tracing_instrumentation_lttng" = "xyes"; then
  AC_CHECK_HEADERS([lttng/tracepoint.h], [],
                   [AC_MSG_ERROR([LTTng instrumentation headers not found.
                                  On Debian, apt install liblttng-ust-dev"])], [])
  AC_DEFINE([USE_TRACING_INSTRUMENTATION_LTTNG], [1], [Using LTTng instrumentation])
  TOR_TRACE_LIBS="-llttng-ust -ldl"
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  have_tracing=1
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fi

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dnl USDT instrumentation option.
AC_ARG_ENABLE(tracing-instrumentation-usdt,
              AS_HELP_STRING([--enable-tracing-instrumentation-usdt],
                             [build with tracing USDT instrumentation]))
AM_CONDITIONAL([USE_TRACING_INSTRUMENTATION_USDT],
               [test "x$enable_tracing_instrumentation_usdt" = "xyes"])

if test "x$enable_tracing_instrumentation_usdt" = "xyes"; then
  AC_CHECK_HEADERS([sys/sdt.h], [],
                   [AC_MSG_ERROR([USDT instrumentation requires sys/sdt.h header.
                                  On Debian, apt install systemtap-sdt-dev])], [])
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  dnl LTTng generates USDT probes if the UST library was built with
  dnl --with-sdt. There is unfortunately no way to check that so we always
  dnl build the USDT probes even though LTTng instrumentation was requested.
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  AC_DEFINE([USE_TRACING_INSTRUMENTATION_USDT], [1], [Using USDT instrumentation])
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  have_tracing=1
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fi

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dnl Tracepoints event to debug logs.
AC_ARG_ENABLE(tracing-instrumentation-log-debug,
     AS_HELP_STRING([--enable-tracing-instrumentation-log-debug],
                    [build with tracing event to debug log]),
     AC_DEFINE([USE_TRACING_INSTRUMENTATION_LOG_DEBUG], [1],
               [Tracepoints to log debug]), [])
AM_CONDITIONAL([USE_TRACING_INSTRUMENTATION_LOG_DEBUG],
               [test "x$enable_tracing_instrumentation_log_debug" = "xyes"])
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if test "x$enable_tracing_instrumentation_log_debug" = "xyes"; then
  have_tracing=1
fi
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dnl Define that tracing is supported if any instrumentation is used.
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AM_COND_IF([USE_TRACING_INSTRUMENTATION_LOG_DEBUG],
           AC_DEFINE([HAVE_TRACING], [1], [Compiled with tracing support]))
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AM_COND_IF([USE_TRACING_INSTRUMENTATION_USDT],
           AC_DEFINE([HAVE_TRACING], [1], [Compiled with tracing support]))
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AM_COND_IF([USE_TRACING_INSTRUMENTATION_LTTNG],
           AC_DEFINE([HAVE_TRACING], [1], [Compiled with tracing support]))
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AM_CONDITIONAL([USE_TRACING], [test "x$have_tracing" = x1 ])
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dnl Finally, define the trace libs.
AC_SUBST([TOR_TRACE_LIBS])
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dnl -- End Tracing Options. --
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dnl Enable Android only features.
AC_ARG_ENABLE(android,
     AS_HELP_STRING(--enable-android, [build with Android features enabled]))
AM_CONDITIONAL([USE_ANDROID], [test "x$enable_android" = "xyes"])

if test "x$enable_android" = "xyes"; then
  AC_DEFINE([USE_ANDROID], [1], [Compile with Android specific features enabled])

  dnl Check if the Android log library is available.
  AC_CHECK_HEADERS([android/log.h])
  AC_SEARCH_LIBS(__android_log_write, [log])

fi

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dnl ---
dnl Tor modules options. These options are namespaced with --disable-module-XXX
dnl ---

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dnl All our modules.
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m4_define(MODULES, relay dirauth dircache)
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dnl Relay module.
AC_ARG_ENABLE([module-relay],
              AS_HELP_STRING([--disable-module-relay],
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                             [Build tor without the Relay modules: tor can not run as a relay, bridge, or authority. Implies --disable-module-dirauth]))
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AM_CONDITIONAL(BUILD_MODULE_RELAY, [test "x$enable_module_relay" != "xno"])
AM_COND_IF(BUILD_MODULE_RELAY,
           AC_DEFINE([HAVE_MODULE_RELAY], [1],
                     [Compile with Relay feature support]))
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dnl Dircache module.  (This cannot be enabled or disabled independently of
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dnl the relay module.  It is not listed by --list-modules for this reason.)
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AM_CONDITIONAL(BUILD_MODULE_DIRCACHE,
               [test "x$enable_module_relay" != "xno"])
AM_COND_IF(BUILD_MODULE_DIRCACHE,
           AC_DEFINE([HAVE_MODULE_DIRCACHE], [1],
                     [Compile with directory cache support]))

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dnl Directory Authority module.
AC_ARG_ENABLE([module-dirauth],
              AS_HELP_STRING([--disable-module-dirauth],
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                             [Build tor without the Directory Authority module: tor can not run as a directory authority or bridge authority]))
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AM_CONDITIONAL(BUILD_MODULE_DIRAUTH,[test "x$enable_module_dirauth" != "xno" && test "x$enable_module_relay" != "xno"])
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AM_COND_IF(BUILD_MODULE_DIRAUTH,
           AC_DEFINE([HAVE_MODULE_DIRAUTH], [1],
                     [Compile with Directory Authority feature support]))
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dnl Helper variables.
TOR_MODULES_ALL_ENABLED=
AC_DEFUN([ADD_MODULE], [
    MODULE=m4_toupper($1)
    TOR_MODULES_ALL_ENABLED="${TOR_MODULES_ALL_ENABLED} -DHAVE_MODULE_${MODULE}=1"
])
m4_foreach_w([module], MODULES, [ADD_MODULE([module])])
AC_SUBST(TOR_MODULES_ALL_ENABLED)

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dnl check for the correct "ar" when cross-compiling.
dnl   (AM_PROG_AR was new in automake 1.11.2, which we do not yet require,
dnl    so kludge up a replacement for the case where it isn't there yet.)
m4_ifdef([AM_PROG_AR],
         [AM_PROG_AR],
         [AN_MAKEVAR([AR], [AC_PROG_AR])
          AN_PROGRAM([ar], [AC_PROG_AR])
          AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([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.
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if test "x$enable_tool_name_check" != "xno"; then
    if test "x$ac_tool_warned" = "xyes"; then
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        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.)])
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	elif test "x$ac_ct_AR" != "x" -a "x$cross_compiling" = "xmaybe"; then
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		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_PROG_SED
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AC_ARG_VAR([PERL], [path to Perl binary])
AC_CHECK_PROGS([PERL], [perl])
AM_CONDITIONAL(USE_PERL, [test "x$ac_cv_prog_PERL" != "x"])
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dnl check for asciidoc and a2x
AC_PATH_PROG([ASCIIDOC], [asciidoc], none)
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AC_PATH_PROGS([A2X], [a2x a2x.py], none)
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AM_CONDITIONAL(USE_ASCIIDOC, test "x$asciidoc" = "xtrue")
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AM_CONDITIONAL(BUILD_MANPAGE, [test "x$enable_manpage" != "xno"])
AM_CONDITIONAL(BUILD_HTML_DOCS, [test "x$enable_html_manual" != "xno"])
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AM_PROG_CC_C_O
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AC_PROG_CC_C99
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AC_CACHE_CHECK([for Python 3], [tor_cv_PYTHON],
   [AC_PATH_PROGS_FEATURE_CHECK([PYTHON], [ \
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	python3 \
	python3.8 python3.7 python3.6 python3.5 python3.4 \
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	python ],
   [["$ac_path_PYTHON" -c 'import sys; sys.exit(sys.version_info[0]<3)' && tor_cv_PYTHON="$ac_path_PYTHON" ac_path_PYTHON_found=:]] )])
AC_SUBST([PYTHON], [$tor_cv_PYTHON])

PYTHON="$tor_cv_PYTHON"

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if test "x$PYTHON" = "x"; then
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  AC_MSG_WARN([Python 3 unavailable; some tests will not be run.])
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fi
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AM_CONDITIONAL(USEPYTHON, [test "x$PYTHON" != "x"])

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dnl List all external rust crates we depend on here. Include the version
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rust_crates=" \
    digest-0.7.2 \
    libc-0.2.39 \
"
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AC_SUBST(rust_crates)
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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])])
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 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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saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_CACHE_CHECK([for __attribute__((fallthrough))],
      tor_cv_c_attr_fallthrough,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([extern int x; void fn(void) ;],
	       [[ switch (x) { case 1: fn(); __attribute__((fallthrough));
                               case 2: fn(); break; } ]])],
	 [tor_cv_c_attr_fallthrough=yes],
	 [tor_cv_c_attr_fallthrough=no] )])
CFLAGS="$saved_CFLAGS"

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if test "$tor_cv_c_attr_fallthrough" = "yes"; then
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  AC_DEFINE(HAVE_ATTR_FALLTHROUGH, [1], [defined if we have the fallthrough attribute.])
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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AH_BOTTOM([
#ifdef _WIN32
/* Defined to access windows functions and definitions for >=WinXP */
# ifndef WINVER
#  define WINVER 0x0501
# endif

/* Defined to access _other_ windows functions and definitions for >=WinXP */
# ifndef _WIN32_WINNT
#  define _WIN32_WINNT 0x0501
# endif

/* Defined to avoid including some windows headers as part of Windows.h */
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN 1
# endif
#endif
])

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AM_CONDITIONAL(WIN32, test "x$bwin32" = "xtrue")
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AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$bwin32" = "xtrue")
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AM_CONDITIONAL(BUILD_LIBTORRUNNER, 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_ARG_VAR([TOR_RUST_TARGET], [Rust target, must be specified when cross-compiling (HOST != BUILD). example: i686-pc-windows-gnu])

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if test "x$enable_rust" = "xyes"; then
  AC_ARG_VAR([RUSTC], [path to the rustc binary])
  AC_CHECK_PROG([RUSTC], [rustc], [rustc],[no])
  if test "x$RUSTC" = "xno"; then
    AC_MSG_ERROR([rustc unavailable but rust integration requested.])
  fi

  AC_ARG_VAR([CARGO], [path to the cargo binary])
  AC_CHECK_PROG([CARGO], [cargo], [cargo],[no])
  if test "x$CARGO" = "xno"; then
    AC_MSG_ERROR([cargo unavailable but rust integration requested.])
  fi

  AC_DEFINE([HAVE_RUST], 1, [have Rust])
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  if test "x$enable_fatal_warnings" = "xyes"; then
    RUST_WARN=
  else
    RUST_WARN=#
  fi
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  if test "x$enable_cargo_online_mode" = "xyes"; then
    CARGO_ONLINE=
    RUST_DL=#
  else
    CARGO_ONLINE=--frozen
    RUST_DL=

    dnl When we're not allowed to touch the network, we need crate dependencies
    dnl locally available.
    AC_MSG_CHECKING([rust crate dependencies])
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    AC_ARG_VAR([TOR_RUST_DEPENDENCIES], [path to directory with local crate mirror])
    if test "x$TOR_RUST_DEPENDENCIES" = "x"; then
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      TOR_RUST_DEPENDENCIES="${srcdir}/src/ext/rust/crates"
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    fi
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    dnl Check whether the path exists before we try to cd into it.
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    if test ! -d "$TOR_RUST_DEPENDENCIES"; then
      AC_MSG_ERROR([Rust dependency directory $TOR_RUST_DEPENDENCIES does not exist. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
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      ERRORED=1
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    fi
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    dnl Make the path absolute, since we'll be using it from within a
    dnl subdirectory.
    TOR_RUST_DEPENDENCIES=$(cd "$TOR_RUST_DEPENDENCIES" ; pwd)

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    for dep in $rust_crates; do
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      if test ! -d "$TOR_RUST_DEPENDENCIES"/"$dep"; then
        AC_MSG_ERROR([Failure to find rust dependency $TOR_RUST_DEPENDENCIES/$dep. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
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        ERRORED=1
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      fi
    done
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    if test "x$ERRORED" = "x"; then
      AC_MSG_RESULT([yes])
    fi
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  fi

  dnl For now both MSVC and MinGW rust libraries will output static libs with
  dnl the MSVC naming convention.
  if test "$bwin32" = "true"; then
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    tor_rust_static_name=tor_rust.lib
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  else
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    tor_rust_static_name=libtor_rust.a
  fi

  AC_CANONICAL_BUILD

  if test -n "$TOR_RUST_TARGET"; then
    if test "$host" = "$build"; then
      AC_MSG_ERROR([HOST = BUILD is invalid if TOR_RUST_TARGET is specified, see configure --help for more information.])
    fi
    RUST_TARGET_PROP="target = '$TOR_RUST_TARGET'"
    TOR_RUST_LIB_PATH="src/rust/target/$TOR_RUST_TARGET/release/$tor_rust_static_name"
  else
    if test "$host" != "$build"; then
      AC_MSG_ERROR([TOR_RUST_TARGET must be specified when cross-compiling with Rust enabled.])
    fi
    RUST_TARGET_PROP=
    TOR_RUST_LIB_PATH="src/rust/target/release/$tor_rust_static_name"
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  fi

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  AC_SUBST(RUST_TARGET_PROP)
  AC_SUBST(TOR_RUST_LIB_PATH)
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  AC_SUBST(CARGO_ONLINE)
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  AC_SUBST(RUST_WARN)
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  AC_SUBST(RUST_DL)

  dnl Let's check the rustc version, too
  AC_MSG_CHECKING([rust version])
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  RUSTC_VERSION=`$RUSTC --version`
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  RUSTC_VERSION_MAJOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 1`
  RUSTC_VERSION_MINOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 2`
  if test "x$RUSTC_VERSION_MAJOR" = "x" -o "x$RUSTC_VERSION_MINOR" = "x"; then
    AC_MSG_ERROR([rustc version couldn't be identified])
  fi
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  if test "$RUSTC_VERSION_MAJOR" -lt 2 -a "$RUSTC_VERSION_MINOR" -lt 31; then
    AC_MSG_ERROR([rustc must be at least version 1.31.0])
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  fi
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  AC_MSG_RESULT([$RUSTC_VERSION])
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fi

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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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AC_SEARCH_LIBS(backtrace, [execinfo])
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saved_LIBS="$LIBS"
AC_SEARCH_LIBS([clock_gettime], [rt])
if test "$LIBS" != "$saved_LIBS"; then
   # Looks like we need -lrt for clock_gettime().
   have_rt=yes
fi
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if test "$bwin32" = "false"; then
  AC_SEARCH_LIBS(pthread_create, [pthread])
  AC_SEARCH_LIBS(pthread_detach, [pthread])
fi
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AM_CONDITIONAL(THREADS_WIN32, test "$bwin32" = "true")
AM_CONDITIONAL(THREADS_PTHREADS, test "$bwin32" = "false")
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AC_CHECK_FUNCS(
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	_NSGetEnviron \
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	RtlSecureZeroMemory \
	SecureZeroMemory \
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	accept4 \
	backtrace \
	backtrace_symbols_fd \
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	eventfd \
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	explicit_bzero \
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	timingsafe_memcmp \
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	flock \
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	fsync \
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	ftime \
	get_current_dir_name \
	getaddrinfo \
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	getdelim \
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	getifaddrs \
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	getline \
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	getrlimit \
	gettimeofday \
	gmtime_r \
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	gnu_get_libc_version \
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	inet_aton \
	ioctl \
	issetugid \
	llround \
	localtime_r \
	lround \
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	madvise \
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	memmem \
	memset_s \
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	minherit \
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	mmap \
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	pipe \
	pipe2 \
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	prctl \
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	readpassphrase \
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	rint \
	sigaction \
	socketpair \
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	statvfs \
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	strncasecmp \
	strcasecmp \
	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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	truncate \
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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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# Apple messed up when they added some functions: they
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# forgot to decorate them with appropriate AVAILABLE_MAC_OS_VERSION
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# checks.

# We should only probe for these functions if we are sure that we
# are not targeting OS X 10.9 or earlier.
AC_MSG_CHECKING([for a pre-Yosemite OS X build target])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifdef __APPLE__
#  include <AvailabilityMacros.h>
#  ifndef MAC_OS_X_VERSION_10_10
#    define MAC_OS_X_VERSION_10_10 101000
#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_10
#      error "Running on Mac OS X 10.9 or earlier"
#    endif
#  endif
#endif
]], [[]])],
   [on_macos_pre_10_10=no ; AC_MSG_RESULT([no])],
   [on_macos_pre_10_10=yes; AC_MSG_RESULT([yes])])

if test "$on_macos_pre_10_10" = "no"; then
  AC_CHECK_FUNCS(
        mach_approximate_time \
  )
fi

# We should only probe for these functions if we are sure that we
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# are not targeting OSX 10.11 or earlier.
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AC_MSG_CHECKING([for a pre-Sierra OSX build target])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#ifdef __APPLE__
#  include <AvailabilityMacros.h>
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#  ifndef MAC_OS_X_VERSION_10_12
#    define MAC_OS_X_VERSION_10_12 101200
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#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
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#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
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#      error "Running on Mac OSX 10.11 or earlier"
#    endif
#  endif
#endif
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]], [[]])],
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   [on_macos_pre_10_12=no ; AC_MSG_RESULT([no])],
   [on_macos_pre_10_12=yes; AC_MSG_RESULT([yes])])

if test "$on_macos_pre_10_12" = "no"; then
  AC_CHECK_FUNCS(
        clock_gettime \
        getentropy \
  )
fi

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  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_FUNCS(pthread_create)
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  AC_CHECK_FUNCS(pthread_condattr_setclock)
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fi

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if test "$bwin32" = "true"; then
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  AC_CHECK_DECLS([SecureZeroMemory, _getwch], , , [
#include <windows.h>
#include <conio.h>
#include <wchar.h>
                 ])
fi

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AM_CONDITIONAL(BUILD_READPASSPHRASE_C,
  test "x$ac_cv_func_readpassphrase" = "xno" && test "$bwin32" = "false")
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AC_MSG_CHECKING([whether free(NULL) works])
AC_RUN_IFELSE([AC_LANG_PROGRAM([
  #include <stdlib.h>
], [
char *p = NULL;
free(p);
])],
[free_null_ok=true; AC_MSG_RESULT(yes)],
[free_null_ok=false; AC_MSG_RESULT(no)],
[free_null_ok=cross; AC_MSG_RESULT(cross)])

if test "$free_null_ok" = "false"; then
   AC_MSG_ERROR([Your libc implementation doesn't allow free(NULL), as required by C99.])
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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  TOR_LIB_SHLWAPI=-lshlwapi
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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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  TOR_LIB_USERENV=-luserenv
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else
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  TOR_LIB_WS32=
  TOR_LIB_GDI=
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  TOR_LIB_USERENV=
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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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AC_SUBST(TOR_LIB_SHLWAPI)
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AC_SUBST(TOR_LIB_USERENV)
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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 "$enable_static_libevent" = "yes"; then
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    if test "$have_rt" = "yes"; then
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      STATIC_LIBEVENT_FLAGS=" -lrt "
    fi
fi

TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <event2/event.h>], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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struct event_base;
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struct event_base *event_base_new(void);
void event_base_free(struct event_base *);],
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    [
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#ifdef _WIN32
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{WSADATA d; WSAStartup(0x101,&d); }
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#endif
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event_base_free(event_base_new());
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], [--with-libevent-dir], [/opt/libevent])
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dnl Determine the incantation needed to link libevent.
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save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
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save_CPPFLAGS="$CPPFLAGS"
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LIBS="$STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32 $save_LIBS"
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LDFLAGS="$TOR_LDFLAGS_libevent $LDFLAGS"
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CPPFLAGS="$TOR_CPPFLAGS_libevent $CPPFLAGS"
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AC_CHECK_HEADERS(event2/event.h event2/dns.h event2/bufferevent_ssl.h)

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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 $STATIC_LIBEVENT_FLAGS"
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   fi
else
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     if test "x$ac_cv_header_event2_event_h" = "xyes"; then
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       AC_SEARCH_LIBS(event_new, [event event_core], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for event_new"))
       AC_SEARCH_LIBS(evdns_base_new, [event event_extra], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for evdns_base_new"))
940

941
       if test "$ac_cv_search_event_new" != "none required"; then
942
943
         TOR_LIBEVENT_LIBS="$ac_cv_search_event_new"
       fi
944
       if test "$ac_cv_search_evdns_base_new" != "none required"; then
945
946
947
         TOR_LIBEVENT_LIBS="$ac_cv_search_evdns_base_new $TOR_LIBEVENT_LIBS"
       fi
     else
948
       AC_MSG_ERROR("libevent2 is required but the headers could not be found")
949
     fi
950
951
fi

952
953
954
dnl Now check for particular libevent functions.
AC_CHECK_FUNCS([evutil_secure_rng_set_urandom_device_file \
                evutil_secure_rng_add_bytes \
955
956
                evdns_base_get_nameserver_addr \

957
958
])

959
960
961
962
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

963
964
965
966
967
dnl Check that libevent is at least at version 2.0.10, the first stable
dnl release of its series
CPPFLAGS="$CPPFLAGS $TOR_CPPFLAGS_libevent"
AC_MSG_CHECKING([whether Libevent is new enough])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
968
#include <event2/event.h>
969
#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 0x02000a00
970
971
972
973
974
#error
int x = y(zz);
#else
int x = 1;
#endif
975
976
977
978
979
980
981
982
])], [ AC_MSG_RESULT([yes]) ],
   [ AC_MSG_RESULT([no])
     AC_MSG_ERROR([Libevent is not new enough.  We require 2.0.10-stable or later]) ] )

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

983
AC_SUBST(TOR_LIBEVENT_LIBS)
984

985
986
987
988
989
990
991
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="$LIBS"
992
993
994
AC_SEARCH_LIBS(pow, [m], , AC_MSG_ERROR([Could not find pow in libm or libc.]))
if test "$ac_cv_search_pow" != "none required"; then
    TOR_LIB_MATH="$ac_cv_search_pow"
995
996
997
998
fi
LIBS="$save_LIBS"
AC_SUBST(TOR_LIB_MATH)

999
1000
1001
1002
1003
1004
dnl ------------------------------------------------------
dnl Hello, NSS.  You're new around here.
if test "x$enable_nss" = "xyes"; then
  PKG_CHECK_MODULES(NSS,
     [nss],
     [have_nss=yes],
1005
     [have_nss=no; AC_MSG_ERROR([You asked for NSS but I can't find it, $pkg_config_user_action, or set NSS_CFLAGS and NSS_LIBS.])])
1006
1007
1008
1009
  AC_SUBST(NSS_CFLAGS)
  AC_SUBST(NSS_LIBS)
fi

1010
dnl ------------------------------------------------------
1011
dnl Where do you live, openssl?  And how do we call you?
1012

1013
1014
if test "x$enable_nss" != "xyes"; then

1015
tor_openssl_pkg_redhat="openssl"
1016
tor_openssl_pkg_debian="libssl-dev"
1017
1018
1019
tor_openssl_devpkg_redhat="openssl-devel"
tor_openssl_devpkg_debian="libssl-dev"

1020
1021
ALT_openssl_WITHVAL=""
AC_ARG_WITH(ssl-dir,
1022
  AS_HELP_STRING(--with-ssl-dir=PATH, [obsolete alias for --with-openssl-dir]),
1023
  [
1024
      if test "x$withval" != "xno" && test "x$withval" != "x"; then
1025
1026
1027
1028
         ALT_openssl_WITHVAL="$withval"
      fi
  ])

1029
AC_MSG_NOTICE([Now, we'll look for OpenSSL >= 1.0.1])
1030
TOR_SEARCH_LIBRARY(openssl, $tryssldir, [-lssl -lcrypto $TOR_LIB_GDI $TOR_LIB_WS32],
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
    [#include <openssl/ssl.h>
     char *getenv(const char *);],
    [struct ssl_cipher_st;
     unsigned SSL_CIPHER_get_id(const struct ssl_cipher_st *);
     char *getenv(const char *);],
    dnl This funny-looking test program calls getenv, so that the compiler
    dnl will neither make code that call SSL_CIPHER_get_id(NULL) [producing
    dnl a crash], nor optimize out the call to SSL_CIPHER_get_id().
    dnl We look for SSL_cipher_get_id() because it is present in
    dnl OpenSSL >=1.0.1, because it is not deprecated, and because Tor
    dnl depends on it.
    [if (getenv("THIS_SHOULDNT_BE_SET_X201803")) SSL_CIPHER_get_id((void *)0);], [],
1043
    [/usr/local/opt/openssl /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /opt/openssl])
1044

1045
1046
dnl XXXX check for OPENSSL_VERSION_NUMBER == SSLeay()

1047
1048
1049
1050
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
1051
     TOR_OPENSSL_LIBS="$TOR_LIBDIR_openssl/libssl.a $TOR_LIBDIR_openssl/libcrypto.a"
1052
1053
   fi
else
1054
     TOR_OPENSSL_LIBS="-lssl -lcrypto"
1055
1056
1057
fi
AC_SUBST(TOR_OPENSSL_LIBS)

1058
1059
1060
1061
1062
1063
1064
dnl Now check for particular openssl functions.
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
save_CPPFLAGS="$CPPFLAGS"
LIBS="$TOR_OPENSSL_LIBS $LIBS"
LDFLAGS="$TOR_LDFLAGS_openssl $LDFLAGS"
CPPFLAGS="$TOR_CPPFLAGS_openssl $CPPFLAGS"
1065

1066
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
1067
#include <openssl/opensslv.h>
1068
#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x1000100fL
1069
1070
#error "too old"
#endif
1071
   ]], [[]])],
1072
   [ : ],
1073
   [ AC_MSG_ERROR([OpenSSL is too old. We require 1.0.1 or later. You can specify a path to a newer one with --with-openssl-dir.]) ])
1074

1075
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
1076
1077
1078
1079
1080
1081
1082
1083
#include <openssl/opensslv.h>
#include <openssl/evp.h>
#if defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_ECDSA)
#error "no ECC"
#endif
#if !defined(NID_X9_62_prime256v1) || !defined(NID_secp224r1)
#error "curves unavailable"
#endif
1084
   ]], [[]])],
1085
   [ : ],
1086
   [ AC_MSG_ERROR([OpenSSL is built without full ECC support, including curves P256 and P224. You can specify a path to one with ECC support with --with-openssl-dir.]) ])
1087

1088
1089
1090
1091
AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])

1092
1093
1094
1095
dnl OpenSSL functions which we might not have.  In theory, we could just
dnl check the openssl version number, but in practice that gets pretty
dnl confusing with LibreSSL, OpenSSL, and various distributions' patches
dnl to them.