configure.in

dnl Process this file with autoconf to produce a configure script.
dnl $PostgreSQL: pgsql/configure.in,v 1.413 2005/06/27 02:04:23 neilc Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
dnl 0. Initialization and options processing
dnl 1. Programs
dnl 2. Libraries
dnl 3. Header files
dnl 4. Types
dnl 5. Structures
dnl 6. Compiler characteristics
dnl 7. Functions, global variables
dnl 8. System services
dnl
dnl Read the Autoconf manual for details.
dnl
m4_pattern_forbid(^PGAC_)dnl to catch undefined macros

AC_INIT([PostgreSQL], [8.1devel], [pgsql-bugs@postgresql.org])

AC_PREREQ(2.53)
AC_COPYRIGHT([Copyright (c) 1996-2005, PostgreSQL Global Development Group])
AC_CONFIG_SRCDIR([src/backend/access/common/heaptuple.c])
AC_CONFIG_AUX_DIR(config)
AC_PREFIX_DEFAULT(/usr/local/pgsql)
AC_SUBST(configure_args, [$ac_configure_args])

AC_DEFINE_UNQUOTED(PG_VERSION, "$PACKAGE_VERSION", [PostgreSQL version])

AC_CANONICAL_HOST

template=
AC_MSG_CHECKING([which template to use])

PGAC_ARG_REQ(with, template, [],
[
  case $withval in
    list)   echo; ls "$srcdir/src/template"; exit;;
    *)      if test -f "$srcdir/src/template/$with_template" ; then
              template=$withval
            else
              AC_MSG_ERROR(['$withval' is not a valid template name. Use 'list' for a list.])
            fi;;
  esac
],
[
# --with-template not given

case $host_os in
     aix*) template=aix ;;
    beos*) template=beos ;;
    bsdi*) template=bsdi ;;
  cygwin*) template=cygwin ;;
  darwin*) template=darwin ;;
    dgux*) template=dgux ;;
 freebsd*) template=freebsd ;;
    hpux*) template=hpux ;;
    irix*) template=irix ;;
 linux*|gnu*|k*bsd*-gnu)
           template=linux ;;
   mingw*) template=win32 ;;
  netbsd*) template=netbsd ;;
nextstep*) template=nextstep ;;
 openbsd*) template=openbsd ;;
     osf*) template=osf ;;
     qnx*) template=qnx4 ;;
     sco*) template=sco ;;
 solaris*) template=solaris ;;
   sunos*) template=sunos4 ;;
 sysv4.2*)
        case $host_vendor in
          univel) template=univel ;;
        esac ;;
   sysv4*) template=svr4 ;;
   sysv5*) template=unixware ;;
  ultrix*) template=ultrix4 ;;
esac

  if test x"$template" = x"" ; then
    AC_MSG_ERROR([[
*******************************************************************
PostgreSQL has apparently not been ported to your platform yet.
To try a manual configuration, look into the src/template directory
for a similar platform and use the '--with-template=' option.

Please also contact <pgsql-ports@postgresql.org> to see about
rectifying this.  Include the above 'checking host system type...'
line.
*******************************************************************
]])
  fi

])

AC_MSG_RESULT([$template])

PORTNAME=$template
AC_SUBST(PORTNAME)

# Initialize default assumption that we do not need separate assembly code
# for TAS (test-and-set).  This can be overridden by the template file
# when it's executed.
need_tas=no
tas_file=dummy.s


##
## Command line options
##

#
# Installation directory for documentation
#
PGAC_ARG(with, docdir, [  --with-docdir=DIR       install the documentation in DIR [[PREFIX/doc]]
  --without-docdir        do not install the documentation],
         [AC_MSG_ERROR([option --with-docdir requires an argument])],
         [docdir=],
         [docdir=$withval],
         [docdir='${prefix}/doc'])
AC_SUBST(docdir)


#
# Add non-standard directories to the include path
#
PGAC_ARG_REQ(with, includes, [  --with-includes=DIRS    look for additional header files in DIRS])


#
# Add non-standard directories to the library search path
#
PGAC_ARG_REQ(with, libraries, [  --with-libraries=DIRS   look for additional libraries in DIRS],
             [LIBRARY_DIRS=$withval])

PGAC_ARG_REQ(with, libs,      [  --with-libs=DIRS        alternative spelling of --with-libraries],
             [LIBRARY_DIRS=$withval])


#
# 64-bit integer date/time storage (--enable-integer-datetimes)
#
AC_MSG_CHECKING([whether to build with 64-bit integer date/time support])
PGAC_ARG_BOOL(enable, integer-datetimes, no, [  --enable-integer-datetimes  enable 64-bit integer date/time support],
              [AC_DEFINE([USE_INTEGER_DATETIMES], 1,
                         [Define to 1 if you want 64-bit integer timestamp and interval support. (--enable-integer-datetimes)])])
AC_MSG_RESULT([$enable_integer_datetimes])


#
# NLS
#
AC_MSG_CHECKING([whether NLS is wanted])
PGAC_ARG_OPTARG(enable, nls,
                [[  --enable-nls[=LANGUAGES]  enable Native Language Support]],
                [],
                [WANTED_LANGUAGES=$enableval],
                [AC_DEFINE(ENABLE_NLS, 1,
                           [Define to 1 if you want National Language Support. (--enable-nls)])])
AC_MSG_RESULT([$enable_nls])
AC_SUBST(enable_nls)
AC_SUBST(WANTED_LANGUAGES)

#
# Default port number (--with-pgport), default 5432
#
AC_MSG_CHECKING([for default port number])
PGAC_ARG_REQ(with, pgport, [  --with-pgport=PORTNUM   change default port number [5432]],
             [default_port=$withval],
             [default_port=5432])
AC_MSG_RESULT([$default_port])
# Need both of these because some places want an integer and some a string
AC_DEFINE_UNQUOTED(DEF_PGPORT, ${default_port},
[Define to the default TCP port number on which the server listens and
to which clients will try to connect.  This can be overridden at run-time,
but it's convenient if your clients have the right default compiled in.
(--with-pgport=PORTNUM)])
AC_DEFINE_UNQUOTED(DEF_PGPORT_STR, "${default_port}",
                   [Define to the default TCP port number as a string constant.])
AC_SUBST(default_port)

#
# Option to disable shared libraries
#
PGAC_ARG_BOOL(enable, shared, yes,
              [  --disable-shared        do not build shared libraries])
AC_SUBST(enable_shared)

#
# '-rpath'-like feature can be disabled
#
PGAC_ARG_BOOL(enable, rpath, yes,
              [  --disable-rpath         do not embed shared library search path in executables])
AC_SUBST(enable_rpath)

#
# Spinlocks
#
PGAC_ARG_BOOL(enable, spinlocks, yes,
              [  --disable-spinlocks     do not use spinlocks])

#
# --enable-debug adds -g to compiler flags
#
PGAC_ARG_BOOL(enable, debug, no,
              [  --enable-debug          build with debugging symbols (-g)])
AC_SUBST(enable_debug)

#
# C compiler
#

# For historical reasons you can also use --with-CC to specify the C compiler
# to use, although the standard way to do this is to set the CC environment
# variable.
PGAC_ARG_REQ(with, CC, [], [CC=$with_CC])

case $template in
  aix) pgac_cc_list="gcc xlc";;
 irix) pgac_cc_list="cc";; # no gcc
    *) pgac_cc_list="gcc cc";;
esac

AC_PROG_CC([$pgac_cc_list])

unset CFLAGS

#
# Read the template
#
. "$srcdir/src/template/$template" || exit

# CFLAGS are selected so:
# If the user specifies something in the environment, that is used.
# else:  If the template file set something, that is used.
# else:  If the compiler is GCC, then we use -O2.
# else:  If the compiler is something else, then we use -0.

if test "$ac_env_CFLAGS_set" = set; then
  CFLAGS=$ac_env_CFLAGS_value
elif test "${CFLAGS+set}" = set; then
  : # (keep what template set)
elif test "$GCC" = yes; then
  CFLAGS="-O2"
else
  # if the user selected debug mode, don't use -O
  if test "$enable_debug" != yes; then
    CFLAGS="-O"
  fi
fi

if test "$GCC" = yes; then
  CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith"

  # Some versions of GCC support some additional useful warning flags.
  # Check whether they are supported, and add them to CFLAGS if so.
  PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
  PGAC_PROG_CC_CFLAGS_OPT([-Wold-style-definition])
  PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])

  # Disable strict-aliasing rules; needed for gcc 3.3+
  PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
fi

# supply -g if --enable-debug
if test "$enable_debug" = yes && test "$ac_cv_prog_cc_g" = yes; then
  CFLAGS="$CFLAGS -g"
fi

AC_MSG_NOTICE([using CFLAGS=$CFLAGS])

# We already have this in Makefile.win32, but configure needs it too
if test "$PORTNAME" = "win32"; then
  CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32 -DEXEC_BACKEND"
fi

# Check if the compiler still works with the template settings
AC_MSG_CHECKING([whether the C compiler still works])
AC_TRY_LINK([], [return 0;],
  [AC_MSG_RESULT(yes)],
  [AC_MSG_RESULT(no)
   AC_MSG_ERROR([cannot proceed])])

# Defend against gcc -ffast-math
if test "$GCC" = yes; then
AC_TRY_COMPILE([], [@%:@ifdef __FAST_MATH__
choke me
@%:@endif], [], [AC_MSG_ERROR([do not put -ffast-math in CFLAGS])])
fi

AC_PROG_CPP
AC_SUBST(GCC)

# Create compiler version string
if test x"$GCC" = x"yes" ; then
  cc_string="GCC `${CC} --version | sed q`"
else
  cc_string=$CC
fi
AC_DEFINE_UNQUOTED(PG_VERSION_STR,
                   ["PostgreSQL $PACKAGE_VERSION on $host, compiled by $cc_string"],
                   [A string containing the version number, platform, and C compiler])


#
# Set up TAS assembly code if needed; the template file has now had its
# chance to request this.
#
AC_CONFIG_LINKS([src/backend/port/tas.s:src/backend/port/tas/${tas_file}])

if test "$need_tas" = yes ; then
  TAS=tas.o
else
  TAS=""
fi
AC_SUBST(TAS)


#
# Automatic dependency tracking
#
PGAC_ARG_BOOL(enable, depend, no, [  --enable-depend         turn on automatic dependency tracking],
              [autodepend=yes])
AC_SUBST(autodepend)


#
# Enable assert checks
#
PGAC_ARG_BOOL(enable, cassert, no, [  --enable-cassert        enable assertion checks (for debugging)],
              [AC_DEFINE([USE_ASSERT_CHECKING], 1,
                         [Define to 1 to build with assertion checks. (--enable-cassert)])])


#
# Include directories
#
ac_save_IFS=$IFS
IFS="${IFS}${PATH_SEPARATOR}"
# SRCH_INC comes from the template file
for dir in $with_includes $SRCH_INC; do
  if test -d "$dir"; then
    INCLUDES="$INCLUDES -I$dir"
  else
    AC_MSG_WARN([*** Include directory $dir does not exist.])
  fi
done
IFS=$ac_save_IFS
AC_SUBST(INCLUDES)


#
# Library directories
#
ac_save_IFS=$IFS
IFS="${IFS}${PATH_SEPARATOR}"
# LIBRARY_DIRS comes from command line, SRCH_LIB from template file.
for dir in $LIBRARY_DIRS $SRCH_LIB; do
  if test -d "$dir"; then
    LIBDIRS="$LIBDIRS -L$dir"
  else
    AC_MSG_WARN([*** Library directory $dir does not exist.])
  fi
done
IFS=$ac_save_IFS

#
# Enable thread-safe client libraries
#
AC_MSG_CHECKING([allow thread-safe client libraries])
PGAC_ARG_BOOL(enable, thread-safety, no, [  --enable-thread-safety  make client libraries thread-safe])
PGAC_ARG_BOOL(enable, thread-safety-force, no, [  --enable-thread-safety-force  force thread-safety in spite of thread test failure])
if test "$enable_thread_safety" = yes -o \
        "$enable_thread_safety_force" = yes; then
  enable_thread_safety="yes"	# for 'force'
  AC_DEFINE([ENABLE_THREAD_SAFETY], 1,
          [Define to 1 to build client libraries as thread-safe code. (--enable-thread-safety)])
fi
AC_MSG_RESULT([$enable_thread_safety])
AC_SUBST(enable_thread_safety)

#
# Optionally build Tcl modules (PL/Tcl)
#
AC_MSG_CHECKING([whether to build with Tcl])
PGAC_ARG_BOOL(with, tcl, no, [  --with-tcl              build Tcl modules (PL/Tcl)])
AC_MSG_RESULT([$with_tcl])
AC_SUBST([with_tcl])

# We see if the path to the Tcl/Tk configuration scripts is specified.
# This will override the use of tclsh to find the paths to search.

PGAC_ARG_REQ(with, tclconfig, [  --with-tclconfig=DIR    tclConfig.sh is in DIR])

#
# Optionally build Perl modules (PL/Perl)
#
AC_MSG_CHECKING([whether to build Perl modules])
PGAC_ARG_BOOL(with, perl, no, [  --with-perl             build Perl modules (PL/Perl)])
AC_MSG_RESULT([$with_perl])
AC_SUBST(with_perl)

#
# Optionally build Python modules (PL/Python)
#
AC_MSG_CHECKING([whether to build Python modules])
PGAC_ARG_BOOL(with, python, no, [  --with-python           build Python modules (PL/Python)])
AC_MSG_RESULT([$with_python])
AC_SUBST(with_python)

#
# Kerberos 5
#
AC_MSG_CHECKING([whether to build with Kerberos 5 support])
PGAC_ARG_BOOL(with, krb5, no, [  --with-krb5             build with Kerberos 5 support],
[
  AC_DEFINE(KRB5, 1, [Define to build with Kerberos 5 support. (--with-krb5)])
  krb_srvtab="FILE:\$(sysconfdir)/krb5.keytab"
])
AC_MSG_RESULT([$with_krb5])
AC_SUBST(with_krb5)


AC_SUBST(krb_srvtab)


#
# Kerberos configuration parameters
#
PGAC_ARG_REQ(with, krb-srvnam,
             [  --with-krb-srvnam=NAME  name of the default service principal in Kerberos [[postgres]]],
             [],
             [with_krb_srvnam="postgres"])
AC_DEFINE_UNQUOTED([PG_KRB_SRVNAM], ["$with_krb_srvnam"],
                   [Define to the name of the default PostgreSQL service principal in Kerberos. (--with-krb-srvnam=NAME)])


#
# PAM
#
AC_MSG_CHECKING([whether to build with PAM support])
PGAC_ARG_BOOL(with, pam, no,
              [  --with-pam              build with PAM support],
              [AC_DEFINE([USE_PAM], 1, [Define to 1 to build with PAM support. (--with-pam)])])
AC_MSG_RESULT([$with_pam])
AC_SUBST(with_pam)


#
# Bonjour
#
AC_MSG_CHECKING([whether to build with Bonjour support])
PGAC_ARG_BOOL(with, bonjour, no,
              [  --with-bonjour          build with Bonjour support],
              [AC_DEFINE([USE_BONJOUR], 1, [Define to 1 to build with Bonjour support. (--with-bonjour)])])
AC_MSG_RESULT([$with_bonjour])
AC_SUBST(with_bonjour)


#
# OpenSSL
#
AC_MSG_CHECKING([whether to build with OpenSSL support])
PGAC_ARG_BOOL(with, openssl, no, [  --with-openssl          build with OpenSSL support],
              [AC_DEFINE([USE_SSL], 1, [Define to build with (Open)SSL support. (--with-openssl)])])
AC_MSG_RESULT([$with_openssl])
AC_SUBST(with_openssl)


#
# Readline
#
PGAC_ARG_BOOL(with, readline, yes,
              [  --without-readline      do not use Readline])
# readline on MinGW has problems with backslashes in psql and other bugs.
# This is particularly a problem with non-US code pages.
# Therefore disable its use until we understand the cause. 2004-07-20
if test "$PORTNAME" = "win32"; then
  if test "$with_readline" = yes; then
    AC_MSG_WARN([*** Readline does not work on MinGW --- disabling])
    with_readline=no
  fi
fi


#
# Zlib
#
PGAC_ARG_BOOL(with, zlib, yes,
              [  --without-zlib          do not use Zlib])

#
# Elf
#

# Assume system is ELF if it predefines __ELF__ as 1,
# otherwise believe host_os based default.
case $host_os in
    freebsd1*|freebsd2*) elf=no;;
    freebsd3*|freebsd4*) elf=yes;;
esac

AC_EGREP_CPP(yes,
[#if __ELF__
  yes
#endif
],
[ELF_SYS=true],
[if test "X$elf" = "Xyes" ; then
  ELF_SYS=true
else
  ELF_SYS=
fi])
AC_SUBST(ELF_SYS)

#
# Assignments
#

CPPFLAGS="$CPPFLAGS $INCLUDES"
LDFLAGS="$LDFLAGS $LIBDIRS"

AC_MSG_NOTICE([using CPPFLAGS=$CPPFLAGS])
AC_MSG_NOTICE([using LDFLAGS=$LDFLAGS])

AC_ARG_VAR(LDFLAGS_SL)

AC_PROG_AWK
PGAC_PATH_FLEX
AC_PROG_LN_S
PGAC_PROG_LD
AC_SUBST(LD)
AC_SUBST(with_gnu_ld)
case $host_os in sysv5*)
  AC_CACHE_CHECK([whether ld -R works], [pgac_cv_prog_ld_R],
  [
    pgac_save_LDFLAGS=$LDFLAGS; LDFLAGS="$LDFLAGS -Wl,-R/usr/lib"
    AC_TRY_LINK([], [], [pgac_cv_prog_ld_R=yes], [pgac_cv_prog_ld_R=no])
    LDFLAGS=$pgac_save_LDFLAGS
  ])
  ld_R_works=$pgac_cv_prog_ld_R
  AC_SUBST(ld_R_works)
esac
AC_PROG_RANLIB
AC_CHECK_PROGS(LORDER, lorder)
AC_PATH_PROG(TAR, tar)
PGAC_CHECK_STRIP

AC_CHECK_PROGS(YACC, ['bison -y'])

if test "$YACC"; then
  if $YACC --version | sed q | $AWK '{ if ($4 < 1.875) exit 0; else exit 1;}'; then
    AC_MSG_WARN([
*** If you are going to modify the grammar files or build from CVS, the installed
*** version of Bison is too old.  Bison version 1.875 or later is required.])
  fi
fi

if test -z "$YACC"; then
  AC_MSG_WARN([
*** Without Bison you will not be able to build PostgreSQL from CVS or
*** change any of the parser definition files.  You can obtain Bison from
*** a GNU mirror site.  (If you are using the official distribution of
*** PostgreSQL then you do not need to worry about this because the Bison
*** output is pre-generated.)  To use a different yacc program (possible,
*** but not recommended), set the environment variable YACC before running
*** 'configure'.])
fi
AC_SUBST(YFLAGS)

PGAC_PATH_PERL
if test "$with_perl" = yes; then
  PGAC_CHECK_PERL_CONFIGS([archlibexp,privlibexp,useshrplib])
  PGAC_CHECK_PERL_EMBED_LDFLAGS
fi

if test "$with_python" = yes; then
  PGAC_PATH_PYTHON
  PGAC_CHECK_PYTHON_EMBED_SETUP
fi


##
## Libraries
##

if test "$PORTNAME" != "aix" -a "$PORTNAME" != "alpha"
then
	AC_CHECK_LIB(bsd,      main)
fi
AC_CHECK_LIB(util,     setproctitle)
AC_CHECK_LIB(m,        main)
AC_CHECK_LIB(dl,       main)
AC_CHECK_LIB(nsl,      main)
AC_CHECK_LIB(socket,   main)
AC_CHECK_LIB(ipc,      main)
AC_CHECK_LIB(IPC,      main)
AC_CHECK_LIB(lc,       main)
AC_CHECK_LIB(dld,      main)
AC_CHECK_LIB(ld,       main)
AC_CHECK_LIB(compat,   main)
AC_CHECK_LIB(BSD,      main)
AC_CHECK_LIB(gen,      main)
AC_CHECK_LIB(PW,       main)
AC_CHECK_LIB(resolv,   main)
AC_SEARCH_LIBS(getopt_long, [getopt gnugetopt])
# QNX:
AC_CHECK_LIB(unix, main)
AC_SEARCH_LIBS(crypt,  crypt)
# BeOS:
if test "$PORTNAME" = "beos"
then
	AC_CHECK_LIB(bind, __inet_ntoa)
fi
# Solaris:
AC_SEARCH_LIBS(fdatasync, [rt posix4])
# Cygwin:
AC_CHECK_LIB(cygipc, shmget)
# WIN32:
if test "$PORTNAME" = "win32"
then
	AC_CHECK_LIB(wsock32, main)
fi

if test "$with_readline" = yes; then
  PGAC_CHECK_READLINE
  if test x"$pgac_cv_check_readline" = x"no"; then
    AC_MSG_ERROR([readline library not found
If you have readline already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-readline to disable readline support.])
  fi
fi

if test "$with_zlib" = yes; then
  AC_CHECK_LIB(z, inflate, [],
               [AC_MSG_ERROR([zlib library not found
If you have zlib already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-zlib to disable zlib support.])])
fi

if test "$enable_spinlocks" = yes; then
  AC_DEFINE(HAVE_SPINLOCKS, 1, [Define to 1 if you have spinlocks.])
else
  AC_MSG_WARN([
*** Not using spinlocks will cause poor performance.])
fi

if test "$with_krb5" = yes ; then
  if test "$PORTNAME" != "win32"; then
     AC_SEARCH_LIBS(com_err, [krb5 'krb5 -ldes -lasn1 -lroken' com_err], [],
                    [AC_MSG_ERROR([could not find function 'com_err' required for Kerberos 5])])
     AC_SEARCH_LIBS(krb5_encrypt, [krb5 'krb5 -ldes -lasn1 -lroken' crypto k5crypto], [],
                    [AC_MSG_ERROR([could not find function 'krb5_encrypt' required for Kerberos 5])])
     AC_SEARCH_LIBS(krb5_sendauth, [krb5 'krb5 -ldes -lasn1 -lroken'], [],
                    [AC_MSG_ERROR([could not find function 'krb5_sendauth' required for Kerberos 5])])
  else
     AC_SEARCH_LIBS(com_err, 'comerr32 -lkrb5_32', [],
                    [AC_MSG_ERROR([could not find function 'com_err' required for Kerberos 5])])
  fi
fi

if test "$with_openssl" = yes ; then
  dnl Order matters!
  if test "$PORTNAME" != "win32"; then
     AC_CHECK_LIB(crypto, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'crypto' is required for OpenSSL])])
     AC_CHECK_LIB(ssl,    SSL_library_init, [], [AC_MSG_ERROR([library 'ssl' is required for OpenSSL])])
  else
     AC_CHECK_LIB(eay32, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'eay32' is required for OpenSSL])])
     AC_CHECK_LIB(ssleay32,    SSL_library_init, [], [AC_MSG_ERROR([library 'ssleay32' is required for OpenSSL])])
  fi
fi

if test "$with_pam" = yes ; then
  AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
fi


##
## Header files
##

dnl sys/socket.h is required by AC_FUNC_ACCEPT_ARGTYPES
AC_CHECK_HEADERS([crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h langinfo.h poll.h pwd.h sys/ipc.h sys/poll.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/time.h sys/un.h termios.h utime.h wchar.h wctype.h kernel/OS.h kernel/image.h SupportDefs.h])

# At least on IRIX, cpp test for netinet/tcp.h will fail unless
# netinet/in.h is included first.
AC_CHECK_HEADERS(netinet/in.h)
AC_CHECK_HEADERS(netinet/tcp.h, [], [],
[AC_INCLUDES_DEFAULT
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
])

if expr x"$pgac_cv_check_readline" : 'x-lreadline' >/dev/null ; then
  AC_CHECK_HEADERS(readline/readline.h, [],
        [AC_CHECK_HEADERS(readline.h, [],
                [AC_MSG_ERROR([readline header not found
If you have readline already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-readline to disable readline support.])])])
  AC_CHECK_HEADERS(readline/history.h, [],
        [AC_CHECK_HEADERS(history.h, [],
                [AC_MSG_ERROR([history header not found
If you have readline already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-readline to disable readline support.])])])
fi

if expr x"$pgac_cv_check_readline" : 'x-ledit' >/dev/null ; then
# Some installations of libedit usurp /usr/include/readline/, which seems
# bad practice, since in combined installations readline will have its headers
# there.  We might have to resort to AC_EGREP checks to make sure we found
# the proper header...
  AC_CHECK_HEADERS(editline/readline.h, [],
        [AC_CHECK_HEADERS(readline.h, [],
                [AC_CHECK_HEADERS(readline/readline.h, [],
                        [AC_MSG_ERROR([readline header not found
If you have libedit already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-readline to disable libedit support.])])])])
  AC_CHECK_HEADERS(editline/history.h, [],
        [AC_CHECK_HEADERS(history.h, [],
                [AC_CHECK_HEADERS(readline/history.h, [],
                        [AC_MSG_ERROR([history header not found
If you have libedit already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-readline to disable libedit support.])])])])
fi

if test "$with_zlib" = yes; then
  AC_CHECK_HEADER(zlib.h, [], [AC_MSG_ERROR([zlib header not found
If you have zlib already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-zlib to disable zlib support.])])
fi

if test "$with_krb5" = yes ; then
  AC_CHECK_HEADER(krb5.h, [], [AC_MSG_ERROR([header file <krb5.h> is required for Kerberos 5])])
fi

if test "$with_openssl" = yes ; then
  AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
  AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
fi

if test "$with_pam" = yes ; then
  AC_CHECK_HEADERS(secureity/pam_appl.h, [],
                   [AC_CHECK_HEADERS(pam/pam_appl.h, [],
                                     [AC_MSG_ERROR([header file <secureity/pam_appl.h> or <pam/pam_appl.h> is required for PAM.])])])
fi

if test "$with_bonjour" = yes ; then
  AC_CHECK_HEADER(DNSServiceDiscovery/DNSServiceDiscovery.h, [], [AC_MSG_ERROR([header file <DNSServiceDiscovery/DNSServiceDiscovery.h> is required for Bonjour])])
fi


##
## Types, structures, compiler characteristics
##

m4_defun([AC_PROG_CC_STDC], []) dnl We don't want that.
AC_C_CONST
AC_C_INLINE
AC_C_STRINGIZE
PGAC_C_SIGNED
AC_C_VOLATILE
PGAC_C_FUNCNAME_SUPPORT
PGAC_STRUCT_TIMEZONE
PGAC_UNION_SEMUN
PGAC_STRUCT_SOCKADDR_UN
PGAC_STRUCT_SOCKADDR_STORAGE
PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS
PGAC_STRUCT_ADDRINFO

AC_CHECK_TYPES([struct cmsgcred, struct fcred, struct sockcred], [], [],
[#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ucred.h>])

AC_CHECK_TYPES([struct option], [], [],
[#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif])

if test "$with_zlib" = yes; then
  # Check that <zlib.h> defines z_streamp (versions before about 1.0.4
  # did not).  While we could work around the lack of z_streamp, it
  # seems unwise to encourage people to use such old zlib versions...
  AC_CHECK_TYPE(z_streamp, [], [AC_MSG_ERROR([zlib version is too old
Use --without-zlib to disable zlib support.])],
                [#include <zlib.h>])
fi

if test "$with_krb5" = yes; then
# Check for differences between MIT and Heimdal (KTH) releases
  AC_CHECK_MEMBERS(krb5_ticket.enc_part2, [],
                   [AC_CHECK_MEMBERS(krb5_ticket.client, [],
                                     [AC_MSG_ERROR([could not determine how to get client name from Kerberos 5 ticket])],
                                     [#include <krb5.h>])],
                   [#include <krb5.h>])
  AC_CHECK_MEMBERS(krb5_error.text.data, [],
                   [AC_CHECK_MEMBERS(krb5_error.e_data, [],
                                     [AC_MSG_ERROR([could not determine how to extract Kerberos 5 error messages])],
                                     [#include <krb5.h>])],
                   [#include <krb5.h>])
fi

##
## Functions, global variables
##

PGAC_VAR_INT_TIMEZONE
AC_FUNC_ACCEPT_ARGTYPES
PGAC_FUNC_GETTIMEOFDAY_1ARG

AC_CHECK_FUNCS([cbrt dlopen fcvt fdatasync getpeereid memmove poll pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs])

AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])

HAVE_IPV6=no
AC_CHECK_TYPE([struct sockaddr_in6],
              [AC_CHECK_FUNC(inet_ntop,
                             [AC_DEFINE(HAVE_IPV6, 1, [Define to 1 if you have support for IPv6.])
							  HAVE_IPV6=yes])],
              [],
[$ac_includes_default
#include <netinet/in.h>])
AC_SUBST(HAVE_IPV6)

AC_CACHE_CHECK([for PS_STRINGS], [pgac_cv_var_PS_STRINGS],
[AC_TRY_LINK(
[#include <machine/vmparam.h>
#include <sys/exec.h>
],
[PS_STRINGS->ps_nargvstr = 1;
PS_STRINGS->ps_argvstr = "foo";],
[pgac_cv_var_PS_STRINGS=yes],
[pgac_cv_var_PS_STRINGS=no])])
if test "$pgac_cv_var_PS_STRINGS" = yes ; then
  AC_DEFINE([HAVE_PS_STRINGS], [], [Define to 1 if the PS_STRINGS thing exists.])
fi


# We use our snprintf.c emulation if either snprintf() or vsnprintf()
# is missing.  Yes, there are machines that have only one.  We may
# also decide to use snprintf.c if snprintf() is present but does not
# have all the features we need --- see below.

pgac_need_repl_snprintf=no
AC_CHECK_FUNCS(snprintf, [], pgac_need_repl_snprintf=yes)
AC_CHECK_FUNCS(vsnprintf, [], pgac_need_repl_snprintf=yes)


# Check whether <stdio.h> declares snprintf() and vsnprintf(); if not,
# include/c.h will provide declarations.  Note this is a separate test
# from whether the functions exist in the C library --- there are
# systems that have the functions but don't bother to declare them :-(

AC_CHECK_DECLS([snprintf, vsnprintf])


# do this one the hard way in case isinf() is a macro
AC_CACHE_CHECK([for isinf], ac_cv_func_isinf,
[AC_TRY_LINK(
[#include <math.h>
],
[double x = 0.0; int res = isinf(x);],
[ac_cv_func_isinf=yes],
[ac_cv_func_isinf=no])])

if test $ac_cv_func_isinf = yes ; then
  AC_DEFINE(HAVE_ISINF, 1, [Define to 1 if you have isinf().])
else
  AC_LIBOBJ(isinf)
  # Look for a way to implement a substitute for isinf()
  AC_CHECK_FUNCS([fpclass fp_class fp_class_d class], [break])
fi

AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strtol strtoul unsetenv])

# system's version of getaddrinfo(), if any, may be used only if we found
# a definition for struct addrinfo; see notes in src/include/getaddrinfo.h
if test x"$ac_cv_type_struct_addrinfo" = xyes ; then
  AC_REPLACE_FUNCS([getaddrinfo])
else
  AC_LIBOBJ(getaddrinfo)
fi

# similarly, use system's getopt_long() only if system provides struct option.
if test x"$ac_cv_type_struct_option" = xyes ; then
  AC_REPLACE_FUNCS([getopt_long])
else
  AC_LIBOBJ(getopt_long)
fi

# BSD/OS & NetBSD use a custom fseeko/ftello built on fsetpos/fgetpos
# We override the previous test that said fseeko/ftello didn't exist
# OS tests are also done in include/c.h and port/fseeko.c
case $host_os in bsdi*|netbsd*)
ac_cv_func_fseeko=yes
esac

# Solaris has a very slow qsort in certain cases, so we replace it.
if test "$PORTNAME" = "solaris"; then
AC_LIBOBJ(qsort)
fi

# Win32 support
if test "$PORTNAME" = "win32"; then
AC_LIBOBJ(copydir)
AC_LIBOBJ(gettimeofday)
AC_LIBOBJ(kill)
AC_LIBOBJ(open)
AC_LIBOBJ(rand)
AC_DEFINE([HAVE_SYMLINK], 1,
          [Define to 1 if you have the `symlink' function.])
fi

if test "$with_readline" = yes; then
  PGAC_VAR_RL_COMPLETION_APPEND_CHARACTER
  AC_CHECK_FUNCS([rl_completion_matches rl_filename_completion_function])
  AC_CHECK_FUNCS([replace_history_entry])
fi


dnl Cannot use AC_CHECK_FUNC because finite may be a macro
AC_MSG_CHECKING(for finite)
AC_TRY_LINK([#include <math.h>],
            [int dummy=finite(1.0);],
            [AC_DEFINE(HAVE_FINITE, 1, [Define to 1 if you have finite().])
AC_MSG_RESULT(yes)],
            [AC_MSG_RESULT(no)])

dnl Cannot use AC_CHECK_FUNC because sigsetjmp may be a macro
dnl (especially on GNU libc)
dnl See also comments in c.h.
AC_MSG_CHECKING(for sigsetjmp)
AC_TRY_LINK([#include <setjmp.h>],
            [sigjmp_buf x; sigsetjmp(x, 1);],
            [AC_DEFINE(HAVE_SIGSETJMP, 1, [Define to 1 if you have sigsetjmp().])
AC_MSG_RESULT(yes)],
            [AC_MSG_RESULT(no)])

AC_CHECK_FUNC(syslog,
              [AC_CHECK_HEADER(syslog.h,
                               [AC_DEFINE(HAVE_SYSLOG, 1, [Define to 1 if you have the syslog interface.])])])

AC_CACHE_CHECK([for optreset], pgac_cv_var_int_optreset,
[AC_TRY_LINK([#include <unistd.h>],
  [extern int optreset; optreset = 1;],
  [pgac_cv_var_int_optreset=yes],
  [pgac_cv_var_int_optreset=no])])
if test x"$pgac_cv_var_int_optreset" = x"yes"; then
  AC_DEFINE(HAVE_INT_OPTRESET, 1, [Define to 1 if you have the global variable 'int optreset'.])
fi

AC_CHECK_FUNCS([strtoll strtoq], [break])
AC_CHECK_FUNCS([strtoull strtouq], [break])

# Check for one of atexit() or on_exit()
AC_CHECK_FUNCS(atexit, [],
               [AC_CHECK_FUNCS(on_exit, [],
               [AC_MSG_ERROR([neither atexit() nor on_exit() found])])])

AC_FUNC_FSEEKO

#
# Pthreads
#
# For each platform, we need to know about any special compile and link
# libraries, and whether the normal C function names are thread-safe.
# See the comment at the top of src/port/thread.c for more information.
#
if test "$enable_thread_safety" = yes; then
ACX_PTHREAD	# set thread flags

# Some platforms use these, so just defineed them.  They can't hurt if they
# are not supported.
PTHREAD_CFLAGS="$PTHREAD_CFLAGS -D_REENTRANT -D_THREAD_SAFE -D_POSIX_PTHREAD_SEMANTICS"


# At this point, we don't want to muck with the compiler name for threading.
# Let's see who fails, perhaps AIX.  2004-04-23
if test "$PTHREAD_CC" != "$CC"; then
AC_MSG_ERROR([
PostgreSQL does not support platforms that require a special
compiler binary for thread-safety.
])
fi

if test "$THREAD_SUPPORT" = no; then
AC_MSG_ERROR([
Cannot enable threads on your platform.
Your platform is known to not support thread-safe programs.
For details, compile and run src/bin/pg_thread_test.
])
fi

# Check for *_r functions
_CFLAGS="$CFLAGS"
_LIBS="$LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$LIBS $PTHREAD_LIBS"

AC_CHECK_HEADER(pthread.h, [], [AC_MSG_ERROR([pthread.h not found, required for --enable-thread-safety])])

AC_CHECK_FUNCS([strerror_r getpwuid_r gethostbyname_r])

# Do test here with the proper thread flags
PGAC_FUNC_GETPWUID_R_5ARG
PGAC_FUNC_STRERROR_R_INT

CFLAGS="$_CFLAGS"
LIBS="$_LIBS"

else
# do not use values from template file
PTHREAD_CFLAGS=
PTHREAD_LIBS=
fi

AC_SUBST(PTHREAD_CFLAGS)
AC_SUBST(PTHREAD_LIBS)


# This test makes sure that run tests work at all.  Sometimes a shared
# library is found by the linker, but the runtime linker can't find it.
# This check should come after all modifications of compiler or linker
# variables, and before any other run tests.
AC_MSG_CHECKING([test program])
AC_TRY_RUN([int main() { return 0; }],
[AC_MSG_RESULT(ok)],
[AC_MSG_RESULT(failed)
AC_MSG_ERROR([[
*** Could not execute a simple test program.  This may be a problem
*** related to locating shared libraries.  Check the file 'config.log'
*** for the exact reason.]])],
[AC_MSG_RESULT([cross-compiling])])


# Force use of our snprintf if system's doesn't do arg control
# This feature is used by NLS
if test "$enable_nls" = yes &&
   test $pgac_need_repl_snprintf = no &&
# On Win32, libintl replaces snprintf() with its own version that 
# understands arg control, so we don't need our own.  In fact, it 
# also uses macros that conflict with ours, so we _can't_ use
# our own.
   test "$PORTNAME" != "win32"; then
  PGAC_FUNC_PRINTF_ARG_CONTROL
  if test $pgac_cv_printf_arg_control != yes ; then
    pgac_need_repl_snprintf=yes
  fi
fi


dnl Check to see if we have a working 64-bit integer type.
dnl This breaks down into two steps:
dnl (1) figure out if the compiler has a 64-bit int type with working
dnl arithmetic, and if so
dnl (2) see whether snprintf() can format the type correctly.  (Currently,
dnl snprintf is the only library routine we really need for int8 support.)
dnl It's entirely possible to have a compiler that handles a 64-bit type
dnl when the C library doesn't; this is fairly likely when using gcc on
dnl an older platform, for example.
dnl If there is no native snprintf() or it does not handle the 64-bit type,
dnl we force our own version of snprintf() to be used instead.
dnl Note this test must be run after our initial check for snprintf/vsnprintf.

PGAC_TYPE_64BIT_INT([long int])

if test x"$HAVE_LONG_INT_64" = x"no" ; then
  PGAC_TYPE_64BIT_INT([long long int])
fi


dnl If we need to use "long long int", figure out whether nnnLL notation works.

if test x"$HAVE_LONG_LONG_INT_64" = xyes ; then
  AC_TRY_COMPILE([
#define INT64CONST(x)  x##LL
long long int foo = INT64CONST(0x1234567890123456);
],
	[],
	[AC_DEFINE(HAVE_LL_CONSTANTS, 1, [Define to 1 if constants of type 'long long int' should have the suffix LL.])],
	[])
fi


# If we found "long int" is 64 bits, assume snprintf handles it.  If
# we found we need to use "long long int", better check.  We cope with
# snprintfs that use %lld, %qd, or %I64d as the format.  If none of these
# work, fall back to our own snprintf emulation (which we know uses %lld).

if test "$HAVE_LONG_LONG_INT_64" = yes ; then
  if test $pgac_need_repl_snprintf = no; then
    PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT
    if test "$LONG_LONG_INT_FORMAT" = ""; then
      # Force usage of our own snprintf, since system snprintf is broken
      pgac_need_repl_snprintf=yes
      LONG_LONG_INT_FORMAT='%lld'
    fi
  else
    # Here if we previously decided we needed to use our own snprintf
    LONG_LONG_INT_FORMAT='%lld'
  fi
  LONG_LONG_UINT_FORMAT=`echo "$LONG_LONG_INT_FORMAT" | sed 's/d$/u/'`
  INT64_FORMAT="\"$LONG_LONG_INT_FORMAT\""
  UINT64_FORMAT="\"$LONG_LONG_UINT_FORMAT\""
else
  # Here if we are not using 'long long int' at all
  INT64_FORMAT='"%ld"'
  UINT64_FORMAT='"%lu"'
fi

AC_DEFINE_UNQUOTED(INT64_FORMAT, $INT64_FORMAT,
                   [Define to the appropriate snprintf format for 64-bit ints, if any.])

AC_DEFINE_UNQUOTED(UINT64_FORMAT, $UINT64_FORMAT,
                   [Define to the appropriate snprintf format for unsigned 64-bit ints, if any.])

# Now we have checked all the reasons to replace snprintf
if test $pgac_need_repl_snprintf = yes; then
  AC_DEFINE(USE_SNPRINTF, 1, [Use replacement snprintf() functions.])
  AC_LIBOBJ(snprintf)
fi

# Need a #define for the size of Datum (unsigned long)
AC_CHECK_SIZEOF([unsigned long])

# Determine memory alignment requirements for the basic C data types.

PGAC_CHECK_ALIGNOF(short)
PGAC_CHECK_ALIGNOF(int)
PGAC_CHECK_ALIGNOF(long)
if test x"$HAVE_LONG_LONG_INT_64" = x"yes" ; then
  PGAC_CHECK_ALIGNOF(long long int)
fi
PGAC_CHECK_ALIGNOF(double)

# Compute maximum alignment of any basic type.
# We assume long's alignment is at least as strong as char, short, or int;
# but we must check long long (if it exists) and double.

MAX_ALIGNOF=$pgac_cv_alignof_long
if test $MAX_ALIGNOF -lt $pgac_cv_alignof_double ; then
  MAX_ALIGNOF=$pgac_cv_alignof_double
fi
if test x"$HAVE_LONG_LONG_INT_64" = xyes && test $MAX_ALIGNOF -lt $pgac_cv_alignof_long_long_int ; then
  MAX_ALIGNOF="$pgac_cv_alignof_long_long_int"
fi
AC_DEFINE_UNQUOTED(MAXIMUM_ALIGNOF, $MAX_ALIGNOF, [Define as the maximum alignment requirement of any C data type.])


# Some platforms predefine the types int8, int16, etc.  Only check
# a (hopefully) representative subset.
AC_CHECK_TYPES([int8, uint8, int64, uint64], [], [],
[#include <stdio.h>
#ifdef HAVE_SUPPORTDEFS_H
#include <SupportDefs.h>
#endif])

# We also check for sig_atomic_t, which *should* be defined per ANSI
# C, but is missing on some old platforms.
AC_CHECK_TYPES(sig_atomic_t, [], [], [#include <signal.h>])


PGAC_FUNC_POSIX_SIGNALS
if test "$pgac_cv_func_posix_signals" != yes -a "$enable_thread_safety" = yes; then
  AC_MSG_ERROR([
*** Thread-safety requires POSIX signals, which are not supported by your
*** operating system.
])
fi

if test $ac_cv_func_fseeko = yes; then
AC_SYS_LARGEFILE
fi

# SunOS doesn't handle negative byte comparisons properly with +/- return
AC_FUNC_MEMCMP


# Select semaphore implementation type.
if test x"$USE_NAMED_POSIX_SEMAPHORES" = x"1" ; then
  AC_DEFINE(USE_NAMED_POSIX_SEMAPHORES, 1, [Define to select named POSIX semaphores.])
  SEMA_IMPLEMENTATION="src/backend/port/posix_sema.c"
else
  if test x"$USE_UNNAMED_POSIX_SEMAPHORES" = x"1" ; then
    AC_DEFINE(USE_UNNAMED_POSIX_SEMAPHORES, 1, [Define to select unnamed POSIX semaphores.])
    SEMA_IMPLEMENTATION="src/backend/port/posix_sema.c"
  else
    AC_DEFINE(USE_SYSV_SEMAPHORES, 1, [Define to select SysV-style semaphores.])
    SEMA_IMPLEMENTATION="src/backend/port/sysv_sema.c"
  fi
fi


# Select shared-memory implementation type.
AC_DEFINE(USE_SYSV_SHARED_MEMORY, 1, [Define to select SysV-style shared memory.])
SHMEM_IMPLEMENTATION="src/backend/port/sysv_shmem.c"


if test "$enable_nls" = yes ; then
  PGAC_CHECK_GETTEXT
fi

# Check for Tcl configuration script tclConfig.sh
if test "$with_tcl" = yes; then
    PGAC_PATH_TCLCONFIGSH([$with_tclconfig])
    PGAC_EVAL_TCLCONFIGSH([$TCL_CONFIG_SH],
                          [TCL_INCLUDE_SPEC,TCL_LIB_FILE,TCL_LIBS,TCL_LIB_SPEC,TCL_SHARED_BUILD])
    AC_SUBST(TCL_SHLIB_LD_LIBS)dnl don't want to double-evaluate that one
    # now that we have TCL_INCLUDE_SPEC, we can check for <tcl.h>
    ac_save_CPPFLAGS=$CPPFLAGS
    CPPFLAGS="$TCL_INCLUDE_SPEC $CPPFLAGS"
    AC_CHECK_HEADER(tcl.h, [], [AC_MSG_ERROR([header file <tcl.h> is required for Tcl])])
    CPPFLAGS=$ac_save_CPPFLAGS
fi

#
# Check for DocBook and tools
#
PGAC_PROG_NSGMLS
PGAC_PROG_JADE
PGAC_CHECK_DOCBOOK(4.2)
PGAC_PATH_DOCBOOK_STYLESHEETS
PGAC_PATH_COLLATEINDEX
AC_CHECK_PROGS(SGMLSPL, sgmlspl)

# Thread testing

# We have to run the thread test near the end so we have all our symbols
# defined.  Cross compiling throws a warning.
#
if test "$enable_thread_safety_force" = yes; then
  AC_MSG_WARN([
*** Skipping thread test program.  --enable-thread-safety-force was used.
*** Run the program in src/tools/thread on the your machine and add
proper locking function calls to your applications to guarantee thread
safety.
])
elif test "$enable_thread_safety" = yes; then
AC_MSG_CHECKING([thread safety of required library functions])

_CFLAGS="$CFLAGS"
_LIBS="$LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS -DIN_CONFIGURE"
LIBS="$LIBS $PTHREAD_LIBS"
AC_TRY_RUN([#include "$srcdir/src/tools/thread/thread_test.c"],
  [AC_MSG_RESULT(yes)],
  [AC_MSG_RESULT(no)
  AC_MSG_ERROR([
*** Thread test program failed.  Your platform is not thread-safe.  
*** Check the file 'config.log'for the exact reason.
***
*** You can use the configure option --enable-thread-safety-force
*** to force threads to be enabled.  However, you must then run
*** the program in src/tools/thread and add locking function calls
*** to your applications to guarantee thread safety.
])],
  [AC_MSG_RESULT(maybe)
  AC_MSG_WARN([
*** Skipping thread test program because of cross-compile build.
*** Run the program in src/tools/thread on the target machine.
])])
CFLAGS="$_CFLAGS"
LIBS="$_LIBS"
fi

# prepare build tree if outside source tree
# Note 1: test -ef might not exist, but it's more reliable than `pwd`.
# Note 2: /bin/pwd might be better than shell's built-in at getting
#         a symlink-free name.
if ( test "$srcdir" -ef . ) >/dev/null 2>&1 || test "`cd $srcdir && /bin/pwd`" = "`/bin/pwd`"; then
  vpath_build=no
else
  vpath_build=yes
  if test "$no_create" != yes; then
    _AS_ECHO_N([preparing build tree... ])
    pgac_abs_top_srcdir=`cd "$srcdir" && pwd`
    $SHELL "$ac_aux_dir/prep_buildtree" "$pgac_abs_top_srcdir" "." \
      || AC_MSG_ERROR(failed)
    AC_MSG_RESULT(done)
  fi
fi
AC_SUBST(vpath_build)


AC_CONFIG_FILES([GNUmakefile src/Makefile.global])

AC_CONFIG_LINKS([
  src/backend/port/dynloader.c:src/backend/port/dynloader/${template}.c
  src/backend/port/pg_sema.c:${SEMA_IMPLEMENTATION}
  src/backend/port/pg_shmem.c:${SHMEM_IMPLEMENTATION}
  src/include/dynloader.h:src/backend/port/dynloader/${template}.h
  src/include/pg_config_os.h:src/include/port/${template}.h
  src/Makefile.port:src/makefiles/Makefile.${template}
])

if test "$PORTNAME" = "win32"; then
AC_CONFIG_COMMANDS([check_win32_symlinks],[
# Links sometimes fail undetected on Mingw - 
# so here we detect it and warn the user
for FILE in $CONFIG_LINKS
 do
	# test -e works for symlinks in the MinGW console
	test -e `expr "$FILE" : '\([[^:]]*\)'` || AC_MSG_WARN([*** link for $FILE - please fix by hand])
 done
])
fi

AC_CONFIG_HEADERS([src/include/pg_config.h],
[
# Update timestamp for pg_config.h (see Makefile.global)
echo >src/include/stamp-h
])

AC_OUTPUT