AC_PREREQ(2.52)

m4_include([version.m4])

m4_include([m4/c99-backport.m4])

AC_INIT([memcached], [VERSION_NUMBER], [memcached@googlegroups.com])

AC_CANONICAL_HOST

AC_CONFIG_SRCDIR([memcached.c])

AM_INIT_AUTOMAKE([foreign])

AM_CONFIG_HEADER([config.h])

AC_PROG_CC

dnl **********************************************************************

dnl DETECT_ICC ([ACTION-IF-YES], [ACTION-IF-NO])

dnl

dnl check if this is the Intel ICC compiler, and if so run the ACTION-IF-YES

dnl sets the $ICC variable to "yes" or "no"

dnl **********************************************************************

AC_DEFUN([DETECT_ICC],

[

    ICC="no"

    AC_MSG_CHECKING([for icc in use])

    if test "$GCC" = "yes"; then

       dnl check if this is icc acting as gcc in disguise

       AC_EGREP_CPP([^__INTEL_COMPILER], [__INTEL_COMPILER],

         AC_MSG_RESULT([no])

         [$2],

         AC_MSG_RESULT([yes])

         [$1]

         ICC="yes")

    else

       AC_MSG_RESULT([no])

       [$2]

    fi

])

DETECT_ICC([], [])

dnl **********************************************************************

dnl DETECT_CLANG ([ACTION-IF-YES], [ACTION-IF-NO])

dnl

dnl check if compiler is clang, and if so run the ACTION-IF-YES sets the

dnl $CLANG variable to "yes" or "no"

dnl **********************************************************************

AC_DEFUN([DETECT_CLANG],

[

    AC_MSG_CHECKING([for clang in use])

    AC_COMPILE_IFELSE(

    [AC_LANG_PROGRAM([], [[

    #ifndef __clang__

           not clang

    #endif

    ]])],

    [CLANG=yes], [CLANG=no])

    AC_MSG_RESULT([$CLANG])

    AS_IF([test "$CLANG" = "yes"],[$1],[$2])

])

DETECT_CLANG([],[])

dnl **********************************************************************

dnl DETECT_SUNCC ([ACTION-IF-YES], [ACTION-IF-NO])

dnl

dnl check if this is the Sun Studio compiler, and if so run the ACTION-IF-YES

dnl sets the $SUNCC variable to "yes" or "no"

dnl **********************************************************************

AC_DEFUN([DETECT_SUNCC],

[

    AC_CHECK_DECL([__SUNPRO_C], [SUNCC="yes"], [SUNCC="no"])

    AS_IF(test "x$SUNCC" = "xyes", [$1], [$2])

])

DETECT_SUNCC([CFLAGS="-mt $CFLAGS"], [])

AS_IF([test "$ICC" = "yes" -o "$GCC" = "yes"],

[

    AS_IF(test "$CLANG" = "no",[CFLAGS="$CFLAGS -pthread"])

])

if test "$ICC" = "no"; then

   AC_PROG_CC_C99

fi

AM_PROG_CC_C_O

AC_PROG_INSTALL

AC_ARG_ENABLE(arm_crc32,

  [AS_HELP_STRING([--enable-arm-crc32], [Enable ARMv8 CRC32 instructions])])

AC_ARG_ENABLE(extstore,

  [AS_HELP_STRING([--enable-extstore], [Enable external storage EXPERIMENTAL ])])

AC_ARG_ENABLE(seccomp,

  [AS_HELP_STRING([--enable-seccomp],[Enable seccomp restrictions EXPERIMENTAL])])

AC_ARG_ENABLE(sasl,

  [AS_HELP_STRING([--enable-sasl],[Enable SASL authentication])])

AC_ARG_ENABLE(sasl_pwdb,

  [AS_HELP_STRING([--enable-sasl-pwdb],[Enable plaintext password db])])

AS_IF([test "x$enable_sasl_pwdb" = "xyes"],

      [enable_sasl=yes ])

AC_ARG_ENABLE(tls,

  [AS_HELP_STRING([--enable-tls], [Enable Transport Layer Security EXPERIMENTAL ])])

AC_ARG_ENABLE(asan,

  [AS_HELP_STRING([--enable-asan], [Compile with ASAN EXPERIMENTAL ])])

dnl **********************************************************************

dnl DETECT_SASL_CB_GETCONF

dnl

dnl check if we can use SASL_CB_GETCONF

dnl **********************************************************************

AC_DEFUN([AC_C_DETECT_SASL_CB_GETCONF],

[

    AC_CACHE_CHECK([for SASL_CB_GETCONF],

        [ac_cv_c_sasl_cb_getconf],

        [AC_TRY_COMPILE(

            [

#include <sasl/sasl.h>

            ], [

unsigned long val = SASL_CB_GETCONF;

            ],

            [ ac_cv_c_sasl_cb_getconf=yes ],

            [ ac_cv_c_sasl_cb_getconf=no ])

        ])

    AS_IF([test "$ac_cv_c_sasl_cb_getconf" = "yes"],

          [AC_DEFINE([HAVE_SASL_CB_GETCONF], 1,

                     [Set to nonzero if your SASL implementation supports SASL_CB_GETCONF])])

])

dnl **********************************************************************

dnl DETECT_SASL_CB_GETCONFPATH

dnl

dnl check if we can use SASL_CB_GETCONFPATH

dnl **********************************************************************

AC_DEFUN([AC_C_DETECT_SASL_CB_GETCONFPATH],

[

    AC_CACHE_CHECK([for SASL_CB_GETCONFPATH],

        [ac_cv_c_sasl_cb_getconfpath],

        [AC_TRY_COMPILE(

            [

#include <sasl/sasl.h>

            ], [

unsigned long val = SASL_CB_GETCONFPATH;

            ],

            [ ac_cv_c_sasl_cb_getconfpath=yes ],

            [ ac_cv_c_sasl_cb_getconfpath=no ])

        ])

    AS_IF([test "$ac_cv_c_sasl_cb_getconfpath" = "yes"],

          [AC_DEFINE([HAVE_SASL_CB_GETCONFPATH], 1,

                     [Set to nonzero if your SASL implementation supports SASL_CB_GETCONFPATH])])

])

AC_CHECK_HEADERS([sasl/sasl.h])

if test "x$enable_sasl" = "xyes"; then

  AC_C_DETECT_SASL_CB_GETCONF

  AC_C_DETECT_SASL_CB_GETCONFPATH

  AC_DEFINE([ENABLE_SASL],1,[Set to nonzero if you want to include SASL])

  AC_SEARCH_LIBS([sasl_server_init], [sasl2 sasl], [],

    [

      AC_MSG_ERROR([Failed to locate the library containing sasl_server_init])

    ])

  AS_IF([test "x$enable_sasl_pwdb" = "xyes"],

        [AC_DEFINE([ENABLE_SASL_PWDB], 1,

                   [Set to nonzero if you want to enable a SASL pwdb])])

fi

AC_ARG_ENABLE(dtrace,

  [AS_HELP_STRING([--enable-dtrace],[Enable dtrace probes])])

if test "x$enable_dtrace" = "xyes"; then

  AC_PATH_PROG([DTRACE], [dtrace], "no", [/usr/sbin:$PATH])

  if test "x$DTRACE" != "xno"; then

    AC_DEFINE([ENABLE_DTRACE],1,[Set to nonzero if you want to include DTRACE])

    build_dtrace=yes

    $DTRACE -h -o conftest.h -s memcached_dtrace.d 2>/dev/zero

    if test $? -eq 0

    then

        dtrace_instrument_obj=yes

        rm conftest.h

    fi

    if test "`which tr`" = "/usr/ucb/tr"; then

        AC_MSG_ERROR([Please remove /usr/ucb from your path. See man standards for more info])

    fi

  else

    AC_MSG_ERROR([Need dtrace binary and OS support.])

  fi

fi

if test "x$enable_extstore" = "xyes"; then

    AC_DEFINE([EXTSTORE],1,[Set to nonzero if you want to enable extstore])

fi

if test "x$enable_tls" = "xyes"; then

    AC_DEFINE([TLS],1,[Set to nonzero if you want to enable TLS])

fi

if test "x$enable_arm_crc32" = "xyes"; then

    AC_DEFINE([ARM_CRC32],1,[Set to nonzero if you want to enable ARMv8 crc32])

fi

if test "x$enable_asan" = "xyes"; then

    AC_DEFINE([ASAN],1,[Set to nonzero if you want to compile using ASAN])

fi

AM_CONDITIONAL([BUILD_DTRACE],[test "$build_dtrace" = "yes"])

AM_CONDITIONAL([DTRACE_INSTRUMENT_OBJ],[test "$dtrace_instrument_obj" = "yes"])

AM_CONDITIONAL([ENABLE_SASL],[test "$enable_sasl" = "yes"])

AM_CONDITIONAL([ENABLE_EXTSTORE],[test "$enable_extstore" = "yes"])

AM_CONDITIONAL([ENABLE_ARM_CRC32],[test "$enable_arm_crc32" = "yes"])

AM_CONDITIONAL([ENABLE_TLS],[test "$enable_tls" = "yes"])

AM_CONDITIONAL([ENABLE_ASAN],[test "$enable_asan" = "yes"])

AC_SUBST(DTRACE)

AC_SUBST(DTRACEFLAGS)

AC_SUBST(ENABLE_SASL)

AC_SUBST(PROFILER_LDFLAGS)

AC_ARG_ENABLE(coverage,

  [AS_HELP_STRING([--disable-coverage],[Disable code coverage])])

if test "x$enable_coverage" != "xno"; then

   if test "$GCC" = "yes" -a "$ICC" != "yes" -a "$CLANG" != "yes"

   then

      CFLAGS="$CFLAGS -pthread"

      AC_PATH_PROG([PROFILER], [gcov], "no", [$PATH])

      if test "x$PROFILER" != "xno"; then

         # Issue 97: The existence of gcov doesn't mean we have -lgcov

         AC_CHECK_LIB(gcov, main,

                    [

                      PROFILER_FLAGS="-fprofile-arcs -ftest-coverage"

                      PROFILER_LDFLAGS="-lgcov"

                    ], [

                      PROFILER_FLAGS=

                      PROFILER_LDFLAGS=

                    ])

      fi

   elif test "$SUNCC" = "yes"

   then

      AC_PATH_PROG([PROFILER], [tcov], "no", [$PATH])

      if test "x$PROFILER" != "xno"; then

         PROFILER_FLAGS=-xprofile=tcov

      fi

   elif test "x$CLANG" != "xno"

   then

      AC_PATH_PROG([PROFILER], [gcov], "no", [$PATH])

      if test "x$PROFILER" != "xno"

      then

          PROFILER_FLAGS="-fprofile-arcs -ftest-coverage"

          PROFILER_LDFLAGS=

      fi

   fi

fi

AC_SUBST(PROFILER_FLAGS)

AC_ARG_ENABLE(64bit,

  [AS_HELP_STRING([--enable-64bit],[build 64bit version])])

if test "x$enable_64bit" = "xyes"

then

    org_cflags=$CFLAGS

    CFLAGS=-m64

    AC_RUN_IFELSE(

      [AC_LANG_PROGRAM([], [dnl

return sizeof(void*) == 8 ? 0 : 1;

      ])

    ],[

      CFLAGS="-m64 $org_cflags"

    ],[

      AC_MSG_ERROR([Don't know how to build a 64-bit object.])

    ],[

       dnl cross compile

       AC_MSG_WARN([Assuming no extra CFLAGS are required for cross-compiling 64bit version.])

    ])

fi

dnl Check if data pointer is 64bit or not

AC_CHECK_SIZEOF([void *])

# Issue 213: Search for clock_gettime to help people linking

#            with a static version of libevent

AC_SEARCH_LIBS(clock_gettime, rt)

# Issue 214: Search for the network libraries _before_ searching

#            for libevent (to help people linking with static libevent)

AC_SEARCH_LIBS(socket, socket)

AC_SEARCH_LIBS(gethostbyname, nsl)

trylibeventdir=""

AC_ARG_WITH(libevent,

       [  --with-libevent=PATH     Specify path to libevent installation ],

       [

                if test "x$withval" != "xno" ; then

                        trylibeventdir=$withval

                fi

       ]

)

dnl ------------------------------------------------------

dnl libevent detection.  swiped from Tor.  modified a bit.

LIBEVENT_URL=https://www.monkey.org/~provos/libevent/

AC_CACHE_CHECK([for libevent directory], ac_cv_libevent_dir, [

  saved_LIBS="$LIBS"

  saved_LDFLAGS="$LDFLAGS"

  saved_CPPFLAGS="$CPPFLAGS"

  le_found=no

  for ledir in $trylibeventdir "" $prefix /usr/local ; do

    LDFLAGS="$saved_LDFLAGS"

    LIBS="-levent $saved_LIBS"

    # Skip the directory if it isn't there.

    if test ! -z "$ledir" -a ! -d "$ledir" ; then

       continue;

    fi

    if test ! -z "$ledir" ; then

      if test -d "$ledir/lib" ; then

        LDFLAGS="-L$ledir/lib $LDFLAGS"

      else

        LDFLAGS="-L$ledir $LDFLAGS"

      fi

      if test -d "$ledir/include" ; then

        CPPFLAGS="-I$ledir/include $CPPFLAGS"

      else

        CPPFLAGS="-I$ledir $CPPFLAGS"

      fi

    fi

    # Can I compile and link it?

    AC_TRY_LINK([#include <sys/time.h>

#include <sys/types.h>

#include <event.h>], [ event_init(); ],

       [ libevent_linked=yes ], [ libevent_linked=no ])

    if test $libevent_linked = yes; then

       if test ! -z "$ledir" ; then

         ac_cv_libevent_dir=$ledir

         _myos=`echo $target_os | cut -f 1 -d .`

         AS_IF(test "$SUNCC" = "yes" -o "x$_myos" = "xsolaris2",

               [saved_LDFLAGS="$saved_LDFLAGS -Wl,-R$ledir/lib"],

               [AS_IF(test "$GCC" = "yes",

                     [saved_LDFLAGS="$saved_LDFLAGS -Wl,-rpath,$ledir/lib"])])

       else

         ac_cv_libevent_dir="(system)"

       fi

       le_found=yes

       break

    fi

  done

  LIBS="$saved_LIBS"

  LDFLAGS="$saved_LDFLAGS"

  CPPFLAGS="$saved_CPPFLAGS"

  if test $le_found = no ; then

    AC_MSG_ERROR([libevent is required.  You can get it from $LIBEVENT_URL

      If it's already installed, specify its path using --with-libevent=/dir/

])

  fi

])

LIBS="-levent $LIBS"

if test $ac_cv_libevent_dir != "(system)"; then

  if test -d "$ac_cv_libevent_dir/lib" ; then

    LDFLAGS="-L$ac_cv_libevent_dir/lib $LDFLAGS"

    le_libdir="$ac_cv_libevent_dir/lib"

  else

    LDFLAGS="-L$ac_cv_libevent_dir $LDFLAGS"

    le_libdir="$ac_cv_libevent_dir"

  fi

  if test -d "$ac_cv_libevent_dir/include" ; then

    CPPFLAGS="-I$ac_cv_libevent_dir/include $CPPFLAGS"

  else

    CPPFLAGS="-I$ac_cv_libevent_dir $CPPFLAGS"

  fi

fi

trylibssldir=""

AC_ARG_WITH(libssl,

       [  --with-libssl=PATH     Specify path to libssl installation ],

       [

                if test "x$withval" != "xno" ; then

                        trylibssldir=$withval

                fi

       ]

)

dnl ----------------------------------------------------------------------------

dnl libssl detection.  swiped from libevent.  modified for openssl detection.

OPENSSL_URL=https://www.openssl.org/

if test "x$enable_tls" = "xyes"; then

  AC_CACHE_CHECK([for libssl directory], ac_cv_libssl_dir, [

    saved_LIBS="$LIBS"

    saved_LDFLAGS="$LDFLAGS"

    saved_CPPFLAGS="$CPPFLAGS"

    le_found=no

    for ledir in $trylibssldir "" $prefix /usr/local ; do

      LDFLAGS="$saved_LDFLAGS"

      LIBS="-lssl -lcrypto $saved_LIBS"

      # Skip the directory if it isn't there.

      if test ! -z "$ledir" -a ! -d "$ledir" ; then

         continue;

      fi

      if test ! -z "$ledir" ; then

        if test -d "$ledir/lib" ; then

          LDFLAGS="-L$ledir/lib $LDFLAGS"

        else

          LDFLAGS="-L$ledir $LDFLAGS"

        fi

        if test -d "$ledir/include" ; then

          CPPFLAGS="-I$ledir/include $CPPFLAGS"

        else

          CPPFLAGS="-I$ledir $CPPFLAGS"

        fi

      fi

      # Can I compile and link it?

      AC_TRY_LINK([#include <sys/time.h>

  #include <sys/types.h>

  #include <assert.h>

  #include <openssl/ssl.h>], [ SSL_CTX* ssl_ctx = SSL_CTX_new(TLS_server_method());

                              assert(OPENSSL_VERSION_NUMBER >= 0x10100000L);],

         [ libssl_linked=yes ], [ libssl_linked=no ])

      if test $libssl_linked = yes; then

         if test ! -z "$ledir" ; then

           ac_cv_libssl_dir=$ledir

           _myos=`echo $target_os | cut -f 1 -d .`

           AS_IF(test "$SUNCC" = "yes" -o "x$_myos" = "xsolaris2",

                 [saved_LDFLAGS="$saved_LDFLAGS -Wl,-R$ledir/lib"],

                 [AS_IF(test "$GCC" = "yes",

                       [saved_LDFLAGS="$saved_LDFLAGS -Wl,-rpath,$ledir/lib"])])

         else

           ac_cv_libssl_dir="(system)"

         fi

         le_found=yes

         break

      fi

    done

    LIBS="$saved_LIBS"

    LDFLAGS="$saved_LDFLAGS"

    CPPFLAGS="$saved_CPPFLAGS"

    if test $le_found = no ; then

      AC_MSG_ERROR([libssl (at least version 1.1.0) is required.  You can get it from $OPENSSL_URL

        If it's already installed, specify its path using --with-libssl=/dir/

  ])

    fi

  ])

  LIBS="-lssl -lcrypto $LIBS"

  if test $ac_cv_libssl_dir != "(system)"; then

    if test -d "$ac_cv_libssl_dir/lib" ; then

      LDFLAGS="-L$ac_cv_libssl_dir/lib $LDFLAGS"

      le_libdir="$ac_cv_libssl_dir/lib"

    else

      LDFLAGS="-L$ac_cv_libssl_dir $LDFLAGS"

      le_libdir="$ac_cv_libssl_dir"

    fi

    if test -d "$ac_cv_libssl_dir/include" ; then

      CPPFLAGS="-I$ac_cv_libssl_dir/include $CPPFLAGS"

    else

      CPPFLAGS="-I$ac_cv_libssl_dir $CPPFLAGS"

    fi

  fi

fi

dnl ----------------------------------------------------------------------------

AC_SEARCH_LIBS(umem_cache_create, umem)

AC_SEARCH_LIBS(gethugepagesizes, hugetlbfs)

AC_HEADER_STDBOOL

AH_BOTTOM([#if HAVE_STDBOOL_H

#include <stdbool.h>

#else

#define bool char

#define false 0

#define true 1

#endif ])

AC_CHECK_HEADERS([inttypes.h])

AH_BOTTOM([#ifdef HAVE_INTTYPES_H

#include <inttypes.h>

#endif

])

dnl **********************************************************************

dnl Figure out if this system has the stupid sasl_callback_ft

dnl **********************************************************************

AC_DEFUN([AC_HAVE_SASL_CALLBACK_FT],

[AC_CACHE_CHECK(for sasl_callback_ft, ac_cv_has_sasl_callback_ft,

[

  AC_TRY_COMPILE([

    #ifdef HAVE_SASL_SASL_H

    #include <sasl/sasl.h>

    #include <sasl/saslplug.h>

    #endif

  ],[

    sasl_callback_ft a_callback;

  ],[

    ac_cv_has_sasl_callback_ft=yes

  ],[

    ac_cv_has_sasl_callback_ft=no

  ])

])

if test $ac_cv_has_sasl_callback_ft = yes; then

  AC_DEFINE(HAVE_SASL_CALLBACK_FT, 1, [we have sasl_callback_ft])

fi

])

AC_HAVE_SASL_CALLBACK_FT

dnl **********************************************************************

dnl DETECT_UINT64_SUPPORT

dnl

dnl check if we can use a uint64_t

dnl **********************************************************************

AC_DEFUN([AC_C_DETECT_UINT64_SUPPORT],

[

    AC_CACHE_CHECK([for print macros for integers (C99 section 7.8.1)],

        [ac_cv_c_uint64_support],

        [AC_TRY_COMPILE(

            [

#ifdef HAVE_INTTYPES_H

#include <inttypes.h>

#endif

#include <stdio.h>

            ], [

  uint64_t val = 0;

  fprintf(stderr, "%" PRIu64 "\n", val);

            ],

            [ ac_cv_c_uint64_support=yes ],

            [ ac_cv_c_uint64_support=no ])

        ])

])

AC_C_DETECT_UINT64_SUPPORT

AS_IF([test "x$ac_cv_c_uint64_support" = "xno"],

      [AC_MSG_WARN([

Failed to use print macros (PRIu) as defined in C99 section 7.8.1.

])])

AC_C_CONST

dnl From licq: Copyright (c) 2000 Dirk Mueller

dnl Check if the type socklen_t is defined anywhere

AC_DEFUN([AC_C_SOCKLEN_T],

[AC_CACHE_CHECK(for socklen_t, ac_cv_c_socklen_t,

[

  AC_TRY_COMPILE([

    #include <sys/types.h>

    #include <sys/socket.h>

  ],[

    socklen_t foo;

  ],[

    ac_cv_c_socklen_t=yes

  ],[

    ac_cv_c_socklen_t=no

  ])

])

if test $ac_cv_c_socklen_t = no; then

  AC_DEFINE(socklen_t, int, [define to int if socklen_t not available])

fi

])

AC_C_SOCKLEN_T

dnl Check if we're a little-endian or a big-endian system, needed by hash code

AC_C_BIGENDIAN(

  [AC_DEFINE(ENDIAN_BIG, 1, [machine is bigendian])],

  [AC_DEFINE(ENDIAN_LITTLE, 1, [machine is littleendian])],

  [AC_MSG_ERROR([Cannot detect endianness. Must pass ac_cv_c_bigendian={yes,no} to configure.])])

AC_DEFUN([AC_C_HTONLL],

[

    AC_MSG_CHECKING([for htonll])

    have_htoll="no"

    AC_TRY_LINK([

#include <sys/types.h>

#include <netinet/in.h>

#ifdef HAVE_INTTYPES_H

#include <inttypes.h> */

#endif

       ], [

          return htonll(0);

       ], [

          have_htoll="yes"

          AC_DEFINE([HAVE_HTONLL], [1], [Have ntohll])

    ], [

          have_htoll="no"

    ])

    AC_MSG_RESULT([$have_htoll])

])

AC_C_HTONLL

dnl Check whether the user's system supports pthread

AC_SEARCH_LIBS(pthread_create, pthread)

if test "x$ac_cv_search_pthread_create" = "xno"; then

  AC_MSG_ERROR([Can't enable threads without the POSIX thread library.])

fi

AC_CHECK_FUNCS(mlockall)

AC_CHECK_FUNCS(getpagesizes)

AC_CHECK_FUNCS(sysconf)

AC_CHECK_FUNCS(memcntl)

AC_CHECK_FUNCS(sigignore)

AC_CHECK_FUNCS(clock_gettime)

AC_CHECK_FUNCS([accept4], [AC_DEFINE(HAVE_ACCEPT4, 1, [Define to 1 if support accept4])])

AC_CHECK_FUNCS([getopt_long], [AC_DEFINE(HAVE_GETOPT_LONG, 1, [Define to 1 if support getopt_long])])

dnl Need to disable opt for alignment check. GCC is too clever and turns this

dnl into wide stores and no cmp under O2.

AC_DEFUN([AC_C_ALIGNMENT],

[AC_CACHE_CHECK(for alignment, ac_cv_c_alignment,

[

  AC_RUN_IFELSE(

    [AC_LANG_PROGRAM([

#include <stdlib.h>

#include <inttypes.h>

#pragma GCC optimize ("O0")

    ], [

       char *buf = malloc(32);

       uint64_t *ptr = (uint64_t*)(buf+2);

       // catch sigbus, etc.

       *ptr = 0x1;

       // catch unaligned word access (ARM cpus)

#ifdef ENDIAN_BIG

#define ALIGNMENT 0x02030405

#else

#define ALIGNMENT 0x05040302

#endif

       *(buf + 0) = 1;

       *(buf + 1) = 2;

       *(buf + 2) = 3;

       *(buf + 3) = 4;

       *(buf + 4) = 5;

       int* i = (int*)(buf+1);

       return (ALIGNMENT == *i) ? 0 : 1;

    ])

  ],[

    ac_cv_c_alignment=none

  ],[

    ac_cv_c_alignment=need

  ],[

    dnl cross compile

    ac_cv_c_alignment=maybe

  ])

])

AS_IF([test $ac_cv_c_alignment = need],

  [AC_DEFINE(NEED_ALIGN, 1, [Machine need alignment])])

AS_IF([test $ac_cv_c_alignment = maybe],

  [AC_MSG_WARN([Assuming aligned access is required when cross-compiling])

   AC_DEFINE(NEED_ALIGN, 1, [Machine need alignment])])

])

AC_C_ALIGNMENT

dnl Check for our specific usage of GCC atomics.

dnl These were added in 4.1.2, but 32bit OS's may lack shorts and 4.1.2

dnl lacks testable defines.

have_gcc_atomics=no

AC_MSG_CHECKING(for GCC atomics)

AC_TRY_LINK([],[

  unsigned short a;

  unsigned short b;

  b = __sync_add_and_fetch(&a, 1);

  b = __sync_sub_and_fetch(&a, 2);

  ],[have_gcc_atomics=yes

  AC_DEFINE(HAVE_GCC_ATOMICS, 1, [GCC Atomics available])])

AC_MSG_RESULT($have_gcc_atomics)

dnl Check for usage of 64bit atomics

dnl 32bit systems shouldn't have these.

have_gcc_64atomics=no

AC_MSG_CHECKING(for GCC 64bit atomics)

AC_TRY_LINK([#include <inttypes.h>

   ],[

  uint64_t a;

  uint64_t b;

  b = __sync_add_and_fetch(&a, 1);

  b = __sync_sub_and_fetch(&a, 2);

  ],[have_gcc_64atomics=yes

  AC_DEFINE(HAVE_GCC_64ATOMICS, 1, [GCC 64bit Atomics available])])

AC_MSG_RESULT($have_gcc_64atomics)

dnl Check for the requirements for running memcached with less privileges

dnl than the default privilege set. On Solaris we need setppriv and priv.h

dnl If you want to add support for other platforms you should check for

dnl your requirements, define HAVE_DROP_PRIVILEGES, and make sure you add

dnl the source file containing the implementation into memcached_SOURCE

dnl in Makefile.am

AC_CHECK_FUNCS(setppriv, [

   AC_CHECK_HEADER(priv.h, [

      AC_DEFINE([HAVE_DROP_PRIVILEGES], 1,

         [Define this if you have an implementation of drop_privileges()])

      build_solaris_privs=yes

   ], [])

],[])

AS_IF([test "x$enable_seccomp" = "xyes" ], [

   AC_CHECK_LIB(seccomp, seccomp_rule_add, [

      AC_DEFINE([HAVE_DROP_PRIVILEGES], 1,

         [Define this if you have an implementation of drop_privileges()])

      build_linux_privs=yes

      AC_DEFINE([HAVE_DROP_WORKER_PRIVILEGES], 1,

         [Define this if you have an implementation of drop_worker_privileges()])

      build_linux_privs=yes

   ], [])

])

AC_CHECK_FUNCS(pledge, [

   AC_CHECK_HEADER(unistd.h, [

      AC_DEFINE([HAVE_DROP_PRIVILEGES], 1,

         [Define this if you have an implementation of drop_privileges()])

      build_openbsd_privs=yes

   ], [])

],[])

AC_CHECK_FUNCS(cap_enter, [

   AC_CHECK_HEADER(sys/capsicum.h, [

      AC_DEFINE([HAVE_DROP_PRIVILEGES], 1,

         [Define this if you have an implementation of drop_privileges()])

      build_freebsd_privs=yes

   ], [])

],[])

AM_CONDITIONAL([BUILD_SOLARIS_PRIVS],[test "$build_solaris_privs" = "yes"])

AM_CONDITIONAL([BUILD_LINUX_PRIVS],[test "$build_linux_privs" = "yes"])

AM_CONDITIONAL([BUILD_OPENBSD_PRIVS],[test "$build_openbsd_privs" = "yes"])

AM_CONDITIONAL([BUILD_FREEBSD_PRIVS],[test "$build_freebsd_privs" = "yes"])

AC_CHECK_HEADER(umem.h, [

   AC_DEFINE([HAVE_UMEM_H], 1,

         [Define this if you have umem.h])

   build_cache=no

], [build_cache=yes])

AM_CONDITIONAL([BUILD_CACHE], [test "x$build_cache" = "xyes"])

AC_ARG_ENABLE(docs,

  [AS_HELP_STRING([--disable-docs],[Disable documentation generation])])

AC_PATH_PROG([XML2RFC], [xml2rfc], "no")

AC_PATH_PROG([XSLTPROC], [xsltproc], "no")

AM_CONDITIONAL([BUILD_SPECIFICATIONS],

               [test "x$enable_docs" != "xno" -a "x$XML2RFC" != "xno" -a "x$XSLTPROC" != "xno"])

dnl Let the compiler be a bit more picky. Please note that you cannot

dnl specify these flags to the compiler before AC_CHECK_FUNCS, because

dnl the test program will generate a compilation warning and hence fail

dnl to detect the function ;-)

if test "$ICC" = "yes"

then

   dnl ICC trying to be gcc.

   CFLAGS="$CFLAGS -diag-disable 187 -Wall -Werror"

   AC_DEFINE([_GNU_SOURCE],[1],[find sigignore on Linux])

elif test "$GCC" = "yes"

then

  GCC_VERSION=`$CC -dumpversion`

  CFLAGS="$CFLAGS -Wall -Werror -pedantic -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls"

  if test "x$enable_asan" = "xyes"; then

    CFLAGS="$CFLAGS -fsanitize=address"

  fi

  case $GCC_VERSION in

    4.4.*)

    CFLAGS="$CFLAGS -fno-strict-aliasing"

    ;;

  esac

  AC_DEFINE([_GNU_SOURCE],[1],[find sigignore on Linux])

elif test "$SUNCC" = "yes"

then

  CFLAGS="$CFLAGS -errfmt=error -errwarn -errshort=tags"

fi

AC_CONFIG_FILES(Makefile doc/Makefile)

AC_OUTPUT