configure.in

  c = a * b;
  snprintf(buf, 100, INT64_FORMAT, c);
  if (strcmp(buf, "800000140000005") != 0)
    return 0;     /* either multiply or snprintf is busted */
  return 1;
}
main() {
  exit(! does_int64_snprintf_work());
}],
  [ AC_MSG_RESULT(yes)
    INT64_FORMAT='"%qd"'
  ],
  [ AC_MSG_RESULT(no)
	# Force usage of our own snprintf, since system snprintf is broken
	SNPRINTF='snprintf.o'
	INT64_FORMAT='"%lld"'
  ],
  [ AC_MSG_RESULT(assuming not on target machine)
	# Force usage of our own snprintf, since we cannot test foreign snprintf
	SNPRINTF='snprintf.o'
	INT64_FORMAT='"%lld"'
  ]) ],
  [ AC_MSG_RESULT(assuming not on target machine)
	# Force usage of our own snprintf, since we cannot test foreign snprintf
	SNPRINTF='snprintf.o'
	INT64_FORMAT='"%lld"'
  ])
  else
    # here if we previously decided we needed to use our own snprintf
    INT64_FORMAT='"%lld"'
  fi
else
  # Here if we are not using 'long long int' at all
  INT64_FORMAT='"%ld"'
fi

AC_DEFINE_UNQUOTED(INT64_FORMAT, $INT64_FORMAT)


dnl Determine memory alignment requirements for the basic C datatypes.

dnl CHECK_ALIGNOF(TYPE)
dnl This is modeled on the standard autoconf macro AC_CHECK_SIZEOF,
dnl except it finds the alignment requirement of the type instead of the size.
dnl The defined symbol is named ALIGNOF_TYPE, where the type name is
dnl converted in the same way as for AC_CHECK_SIZEOF.
dnl If cross-compiling, sizeof(type) is used as a default assumption.

AC_DEFUN(CHECK_ALIGNOF,
[changequote(<<, >>)dnl
dnl The name to #define.
define(<<AC_TYPE_NAME>>, translit(alignof_$1, [a-z *], [A-Z_P]))dnl
dnl The cache variable name.
define(<<AC_CV_NAME>>, translit(ac_cv_alignof_$1, [ *], [_p]))dnl
changequote([, ])dnl
AC_MSG_CHECKING(alignment of $1)
AC_CACHE_VAL(AC_CV_NAME,
[AC_TRY_RUN([#include <stdio.h>
struct { char filler; $1 field; } mystruct;
main()
{
  FILE *f=fopen("conftestval", "w");
  if (!f) exit(1);
  fprintf(f, "%d\n", ((char*) & mystruct.field) - ((char*) & mystruct));
  exit(0);
}], AC_CV_NAME=`cat conftestval`,
AC_CV_NAME='sizeof($1)',
AC_CV_NAME='sizeof($1)')])dnl
AC_MSG_RESULT($AC_CV_NAME)
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME)
undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
])

CHECK_ALIGNOF(short)
CHECK_ALIGNOF(int)
CHECK_ALIGNOF(long)
if [[ $HAVE_LONG_LONG_INT_64 -eq 1 ]] ; then
  CHECK_ALIGNOF(long long int)
fi
CHECK_ALIGNOF(double)

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

if [[ $ac_cv_alignof_double != 'sizeof(double)' ]] ; then
  MAX_ALIGNOF="$ac_cv_alignof_long"
  if [[ $MAX_ALIGNOF -lt $ac_cv_alignof_double ]] ; then
    MAX_ALIGNOF="$ac_cv_alignof_double"
  fi
  if [[ $HAVE_LONG_LONG_INT_64 -eq 1 ]] ; then
    if [[ $MAX_ALIGNOF -lt $ac_cv_alignof_long_long_int ]] ; then
      MAX_ALIGNOF="$ac_cv_alignof_long_long_int"
    fi
  fi
else
  dnl cross-compiling: assume that double's alignment is worst case
  MAX_ALIGNOF="$ac_cv_alignof_double"
fi
AC_DEFINE_UNQUOTED(MAXIMUM_ALIGNOF, $MAX_ALIGNOF)


dnl Check to see if platform has POSIX signal interface.
dnl NOTE: if this test fails then POSIX signals definitely don't work.
dnl It could be that the test compiles but the POSIX routines don't
dnl really work ... in that case the platform-specific port files
dnl can unset USE_POSIX_SIGNALS and HAVE_POSIX_SIGNALS.  (The former
dnl goes into config.h, the latter into Makefile.global.)

AC_MSG_CHECKING(for POSIX signal interface)
AC_TRY_LINK([#include <signal.h>],
[struct sigaction act, oact;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(0, &act, &oact);],
[AC_DEFINE(USE_POSIX_SIGNALS)
HAVE_POSIX_SIGNALS="1"
AC_MSG_RESULT(yes)],
[HAVE_POSIX_SIGNALS=""
AC_MSG_RESULT(no)])
AC_SUBST(HAVE_POSIX_SIGNALS)

dnl Check for Tcl configuration script tclConfig.sh

dnl If --with-tclconfig was given, don't check for tclsh, tcl
if test -z "$TCL_DIRS"
then
	AC_PATH_PROG(TCLSH, tclsh)
	if test -z "$TCLSH"
	then
		AC_PATH_PROG(TCLSH, tcl)
		if test -z "$TCLSH"
		then
			AC_MSG_WARN(TCL/TK support disabled; tcl shell is not in your path)
			USE_TCL=
		fi
	fi
fi
	
if test "$USE_TCL" = true
then
	AC_MSG_CHECKING(for tclConfig.sh)
	TCL_CONFIG_SH=
	library_dirs=
	if test -z "$TCL_DIRS"
	then
		library_dirs=`echo 'puts $auto_path' | $TCLSH`
	fi
	library_dirs="$TCL_DIRS $TK_DIRS $library_dirs"
	for dir in $library_dirs; do
		if test -d "$dir" -a -r "$dir/tclConfig.sh"; then
			TCL_CONFIG_SH=$dir/tclConfig.sh
			break
		fi
	done
	if test -z "$TCL_CONFIG_SH"; then
		AC_MSG_RESULT(no)
		AC_MSG_WARN(TCL/TK support disabled; Tcl configuration script missing)
		USE_TCL=
	else
		AC_MSG_RESULT($TCL_CONFIG_SH)
		AC_SUBST(TCL_CONFIG_SH)
	fi
fi

USE_TK=$USE_TCL		# If TCL is disabled, disable TK

dnl Check for Tk configuration script tkConfig.sh
if test "$USE_TK" = true
then
	AC_MSG_CHECKING(for tkConfig.sh)
	TK_CONFIG_SH=
	# library_dirs are set in the check for TCL
	for dir in $library_dirs
	do
		if test -d "$dir" -a -r "$dir/tkConfig.sh"
		then
			TK_CONFIG_SH=$dir/tkConfig.sh
			break
		fi
	done
	if test -z "$TK_CONFIG_SH"
	then
		AC_MSG_RESULT(no)
		AC_MSG_WARN(TK support disabled; Tk configuration script missing)
		USE_TK=
	else
		AC_MSG_RESULT($TK_CONFIG_SH)
		AC_SUBST(TK_CONFIG_SH)
		AC_PATH_PROG(WISH, wish)
	fi
fi

USE_X=$USE_TK

dnl Check for X libraries

if test "$USE_X" = true; then

	ice_save_LIBS="$LIBS"
	ice_save_CFLAGS="$CFLAGS"
	ice_save_CPPFLAGS="$CPPFLAGS"
	ice_save_LDFLAGS="$LDFLAGS"

	AC_PATH_XTRA

	LIBS="$LIBS $X_EXTRA_LIBS"
	CFLAGS="$CFLAGS $X_CFLAGS"
	CPPFLAGS="$CPPFLAGS $X_CFLAGS"
	LDFLAGS="$LDFLAGS $X_LIBS"

	dnl Check for X library

	X11_LIBS=""
	AC_CHECK_LIB(X11, XOpenDisplay, X11_LIBS="-lX11",,${X_PRE_LIBS})
	if test "$X11_LIBS" = ""; then
		dnl Not having X is bad news for pgtksh. Let the user fix this.
		AC_MSG_WARN([The X11 library '-lX11' could not be found,
so TK support will be disabled.  To enable TK support,
please use the configure options '--x-includes=DIR'
and '--x-libraries=DIR' to specify the X location.
See the file 'config.log' for further diagnostics.])
		USE_TK=
	fi
	AC_SUBST(X_LIBS)
	AC_SUBST(X11_LIBS)
	AC_SUBST(X_PRE_LIBS)

	LIBS="$ice_save_LIBS"
	CFLAGS="$ice_save_CFLAGS"
	CPPFLAGS="$ice_save_CPPFLAGS"
	LDFLAGS="$ice_save_LDFLAGS"
fi

dnl cause configure to recurse into subdirectories with their own configure
dnl Darn, setting AC_CONFIG_SUBDIRS sets a list $subdirs$ in the configure output
dnl  file, but then configure doesn't bother using that list. Probably a bug in
dnl  this version of autoconf.
dnl So at the moment interfaces/odbc gets configured unconditionally.
dnl - thomas 1998-10-05
#if test "X$USE_ODBC" = "Xtrue"
#then
#	AC_CONFIG_SUBDIRS(interfaces/odbc)
#fi
if test "$USE_ODBC" = "true"
then
	PWD_INCDIR=no
	AC_CHECK_HEADER(pwd.h, PWD_INCDIR=yes)
	if test "$PWD_INCDIR" = "no"; then
		AC_MSG_WARN(odbc support disabled; pwd.h missing)
		USE_ODBC=
	fi
	AC_SUBST(USE_ODBC)
fi

dnl Output files that are neither makefiles nor shell scripts probably
dnl need fully-expanded substitutions, rather than partial expansions
dnl that include references to other variables.  Currently the only
dnl such item that's needed is an expanded version of libdir, but
dnl others may be needed someday.  NOTE: 'eval' technique only copes
dnl with one level of indirect reference per expansion; two levels is
dnl currently enough for libdir, but it's ugly...

dnl First we have to force 'NONE' prefix to be expanded itself.
dnl For some reason, autoconf 2.13 doesn't do this until AC_OUTPUT,
dnl which is too late...
test "x$prefix" = xNONE && prefix=$ac_default_prefix
test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'

eval expanded_libdir="$libdir"
eval expanded_libdir="$expanded_libdir"
AC_SUBST(expanded_libdir)

dnl Finally ready to produce output files ...

AC_OUTPUT(
	GNUmakefile
	Makefile.global
	backend/port/Makefile
	backend/catalog/genbki.sh
	backend/utils/Gen_fmgrtab.sh
	bin/pg_dump/Makefile
	bin/pg_version/Makefile
	bin/pgtclsh/mkMakefile.tcldefs.sh
	bin/pgtclsh/mkMakefile.tkdefs.sh
	bin/psql/Makefile
	include/version.h
	interfaces/libpq/Makefile
	interfaces/ecpg/lib/Makefile
	interfaces/ecpg/preproc/Makefile
	interfaces/libpq++/Makefile
	interfaces/libpgeasy/Makefile
	interfaces/libpgtcl/Makefile
	interfaces/odbc/GNUmakefile
	interfaces/odbc/Makefile.global
	pl/plpgsql/src/Makefile
	pl/plpgsql/src/mklang.sql
	pl/tcl/mkMakefile.tcldefs.sh
	test/regress/GNUmakefile
)