configure.in

# 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])])


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 [[ 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)],
	[])
fi


dnl If we found "long int" is 64 bits, assume snprintf handles it.
dnl If we found we need to use "long long int", better check.
dnl We cope with snprintfs that use either %lld or %qd as the format.
dnl If neither works, fall back to our own snprintf emulation (which we
dnl know uses %lld).

if [[ x"$HAVE_LONG_LONG_INT_64" = xyes ]] ; then
  if [[ x$SNPRINTF = x ]] ; then
    AC_MSG_CHECKING(whether snprintf handles 'long long int' as %lld)
    AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%lld"

int64 a = 20000001;
int64 b = 40000005;

int does_int64_snprintf_work()
{
  int64 c;
  char buf[100];

  if (sizeof(int64) != 8)
    return 0;			/* doesn't look like the right size */

  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='"%lld"'
	],
  [ AC_MSG_RESULT(no)
    AC_MSG_CHECKING(whether snprintf handles 'long long int' as %qd) 
    AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%qd"
   
int64 a = 20000001;
int64 b = 40000005;
   
int does_int64_snprintf_work()
{  
  int64 c;
  char buf[100];

  if (sizeof(int64) != 8)
    return 0;     /* doesn't look like the right size */

  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)


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

dnl psql needs atexit() or on_exit()
AC_CHECK_FUNC(atexit,
	[AC_DEFINE(HAVE_ATEXIT)],
	[AC_CHECK_FUNCS(on_exit,
		[AC_DEFINE(HAVE_ON_EXIT)],
		[AC_MSG_ERROR([neither atexit() nor on_exit() found])])])

dnl Need a #define for the size of Datum (unsigned long)

AC_CHECK_SIZEOF(unsigned long, 4)
AC_DEFINE_UNQUOTED(SIZEOF_DATUM, $ac_cv_sizeof_unsigned_long)

dnl Determine memory alignment requirements for the basic C datatypes.

PGAC_CHECK_ALIGNOF(short)
PGAC_CHECK_ALIGNOF(int)
PGAC_CHECK_ALIGNOF(long)
if [[ x"$HAVE_LONG_LONG_INT_64" = xyes ]] ; then
  PGAC_CHECK_ALIGNOF(long long int)
fi
PGAC_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 test $pgac_cv_alignof_double != 'sizeof(double)' ; then
  MAX_ALIGNOF=$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
else
  dnl cross-compiling: assume that double's alignment is worst case
  MAX_ALIGNOF="$pgac_cv_alignof_double"
fi
AC_DEFINE_UNQUOTED(MAXIMUM_ALIGNOF, $MAX_ALIGNOF, [Define as the maximum alignment requirement of any type])


# Some platforms predefine the types int8, int16, etc.  Only check
# a (hopefully) representative subset.  We also check for sig_atomic_t,
# which *should* be defined per ANSI C, but is missing on some old platforms.

pgac_type_includes="\
#include <stdio.h>
#include <signal.h>
#ifdef HAVE_SUPPORTDEFS_H
#include <SupportDefs.h>
#endif"

PGAC_CHECK_TYPE(int8, [], [], [$pgac_type_includes])
PGAC_CHECK_TYPE(uint8, [], [], [$pgac_type_includes])
PGAC_CHECK_TYPE(int64, [], [], [$pgac_type_includes])
PGAC_CHECK_TYPE(uint64, [], [], [$pgac_type_includes])
PGAC_CHECK_TYPE(sig_atomic_t, [], [], [$pgac_type_includes])


PGAC_FUNC_POSIX_SIGNALS


# Check for Tcl configuration script tclConfig.sh
if test "$with_tcl" = yes; then
    PGAC_PATH_TCLCONFIGSH([$with_tclconfig])
fi

# Check for Tk configuration script tkConfig.sh
if test "$with_tk" = yes; then
    PGAC_PATH_TKCONFIGSH([$with_tkconfig $with_tclconfig])
fi


#
# Check for DocBook and tools
#
PGAC_PROG_NSGMLS
# If you don't have nsgmls you won't get very far, so save the cycles.
if test -n "$NSGMLS"; then
  PGAC_PROG_JADE
  PGAC_CHECK_DOCBOOK([3.1])
  PGAC_PATH_DOCBOOK_STYLESHEETS
  AC_CHECK_PROGS(SGMLSPL, sgmlspl)
fi

abs_top_srcdir=
AC_SUBST(abs_top_srcdir)

# 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
    :
else
    abs_top_srcdir=`cd $srcdir && pwd`
    echo $ac_n "preparing build tree... $ac_c" 1>&6
    /bin/sh "$srcdir/config/prep_buildtree" "$abs_top_srcdir" "." \
      || AC_MSG_ERROR(failed)
    AC_MSG_RESULT(done)
fi

AC_OUTPUT(
[
  GNUmakefile
  src/GNUmakefile
  src/Makefile.global
  src/backend/port/Makefile
],
[
# Update timestamp for pg_config.h (see Makefile.global)
test x"$CONFIG_HEADERS" != x"" && echo >src/include/stamp-h
])