# $Header: /cvsroot/pgsql/aclocal.m4,v 1.3 2000/06/14 18:17:24 petere Exp $
# This comes from the official Autoconf macro archive at
# <http://research.cys.de/autoconf-archive/>
# (I removed the $ before the Id CVS keyword below.)


dnl @synopsis AC_FUNC_ACCEPT_ARGTYPES
dnl
dnl Checks the data types of the three arguments to accept(). Results are
dnl placed into the symbols ACCEPT_TYPE_ARG[123], consistent with the
dnl following example:
dnl
dnl       #define ACCEPT_TYPE_ARG1 int
dnl       #define ACCEPT_TYPE_ARG2 struct sockaddr *
dnl       #define ACCEPT_TYPE_ARG3 socklen_t
dnl
dnl This macro requires AC_CHECK_HEADERS to have already verified the
dnl presence or absence of sys/types.h and sys/socket.h.
dnl
dnl NOTE: This is just a modified version of the AC_FUNC_SELECT_ARGTYPES
dnl macro. Credit for that one goes to David MacKenzie et. al.
dnl
dnl @version Id: ac_func_accept_argtypes.m4,v 1.1 1999/12/03 11:29:29 simons Exp $
dnl @author Daniel Richard G. <skunk@mit.edu>
dnl

# PostgreSQL local changes: In the original version ACCEPT_TYPE_ARG3
# is a pointer type. That's kind of useless because then you can't
# use the macro to define a corresponding variable. We also make the
# reasonable(?) assumption that you can use arg3 for getsocktype etc.
# as well (i.e., anywhere POSIX.2 has socklen_t).

AC_DEFUN(AC_FUNC_ACCEPT_ARGTYPES,
[AC_MSG_CHECKING([types of arguments for accept()])
 AC_CACHE_VAL(ac_cv_func_accept_arg1,dnl
 [AC_CACHE_VAL(ac_cv_func_accept_arg2,dnl
  [AC_CACHE_VAL(ac_cv_func_accept_arg3,dnl
   [for ac_cv_func_accept_arg1 in 'int' 'unsigned int'; do
     for ac_cv_func_accept_arg2 in 'struct sockaddr *' 'void *'; do
      for ac_cv_func_accept_arg3 in 'socklen_t' 'size_t' 'unsigned int' 'int'; do
       AC_TRY_COMPILE(dnl
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
extern accept ($ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *);],,dnl
        [ac_not_found=no ; break 3], ac_not_found=yes)
      done
     done
    done
   ])dnl AC_CACHE_VAL
  ])dnl AC_CACHE_VAL
 ])dnl AC_CACHE_VAL
 if test "$ac_not_found" = yes; then
  ac_cv_func_accept_arg1=int
  ac_cv_func_accept_arg2='struct sockaddr *'
  ac_cv_func_accept_arg3='socklen_t'
 fi
 AC_MSG_RESULT([$ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *])
 AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG1,$ac_cv_func_accept_arg1)
 AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG2,$ac_cv_func_accept_arg2)
 AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG3,$ac_cv_func_accept_arg3)
])
# Macros to detect C compiler features
# $Header: /cvsroot/pgsql/aclocal.m4,v 1.3 2000/06/14 18:17:24 petere Exp $


# PGAC_C_SIGNED
# -------------
# Check if the C compiler understands signed types.
# (Of course any ISO C compiler should, what is this still doing here?)
AC_DEFUN([PGAC_C_SIGNED],
[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
[AC_TRY_COMPILE([],
[signed char c; signed short s; signed int i;],
[pgac_cv_c_signed=yes],
[pgac_cv_c_signed=no])])
if test x"$pgac_cv_c_signed" = xno ; then
  AC_DEFINE(signed,, [Define empty if the C compiler does not understand signed types])
fi])# PGAC_C_SIGNED



# PGAC_C_VOLATILE
# ---------------
# Check if the C compiler understands `volatile'. Note that if it doesn't
# then this will potentially break the program semantics.
AC_DEFUN([PGAC_C_VOLATILE],
[AC_CACHE_CHECK(for volatile, pgac_cv_c_volatile,
[AC_TRY_COMPILE([],
[extern volatile int i;],
[pgac_cv_c_volatile=yes],
[pgac_cv_c_volatile=no])])
if test x"$pgac_cv_c_volatile" = xno ; then
  AC_DEFINE(volatile,, [Define empty if the C compiler does not understand `volatile'])
fi])# PGAC_C_VOLATILE



# PGAC_TYPE_64BIT_INT(TYPE)
# -------------------------
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
# yes or no respectively, and define HAVE_TYPE_64 if yes.
AC_DEFUN([PGAC_TYPE_64BIT_INT],
[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
[AC_TRY_RUN(
[typedef $1 int64;

/*
 * These are globals to discourage the compiler from folding all the
 * arithmetic tests down to compile-time constants.
 */
int64 a = 20000001;
int64 b = 40000005;

int does_int64_work()
{
  int64 c,d;

  if (sizeof(int64) != 8)
    return 0;			/* definitely not the right size */

  /* Do perfunctory checks to see if 64-bit arithmetic seems to work */
  c = a * b;
  d = (c + b) / b;
  if (d != a+1)
    return 0;
  return 1;
}
main() {
  exit(! does_int64_work());
}],
[Ac_cachevar=yes],
[Ac_cachevar=no],
[Ac_cachevar=no
dnl We will do better here with Autoconf 2.50
AC_MSG_WARN([64 bit arithmetic disabled when cross-compiling])])])

Ac_define=$Ac_cachevar
if test x"$Ac_cachevar" = xyes ; then
  AC_DEFINE(Ac_define,, [Set to 1 if `]$1[' is 64 bits])
fi
undefine([Ac_define])dnl
undefine([Ac_cachevar])dnl
])# PGAC_TYPE_64BIT_INT



# PGAC_CHECK_ALIGNOF(TYPE)
# ------------------------
# Find the alignment requirement of the given type. Define the result
# as ALIGNOF_TYPE. If cross-compiling, sizeof(type) is used as a
# default assumption.
#
# This is modeled on the standard autoconf macro AC_CHECK_SIZEOF.
# That macro never got any points for style.
AC_DEFUN([PGAC_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(pgac_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, [The alignment requirement of a `]$1['])
undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
])# PGAC_CHECK_ALIGNOF
# Macros that test various C library quirks
# $Header: /cvsroot/pgsql/aclocal.m4,v 1.3 2000/06/14 18:17:24 petere Exp $


# PGAC_VAR_INT_TIMEZONE
# ---------------------
# Check if the global variable `timezone' exists. If so, define
# HAVE_INT_TIMEZONE.
AC_DEFUN([PGAC_VAR_INT_TIMEZONE],
[AC_CACHE_CHECK(for int timezone, pgac_cv_var_int_timezone,
[AC_TRY_LINK([#include <time.h>],
  [int res = timezone / 60;],
  [pgac_cv_var_int_timezone=yes],
  [pgac_cv_var_int_timezone=no])])
if test x"$pgac_cv_var_int_timezone" = xyes ; then
  AC_DEFINE(HAVE_INT_TIMEZONE,, [Set to 1 if you have the global variable timezone])
fi])# PGAC_VAR_INT_TIMEZONE


# PGAC_FUNC_GETTIMEOFDAY_1ARG
# ---------------------------
# Check if gettimeofday() has only one arguments. (Normal is two.)
# If so, define GETTIMEOFDAY_1ARG.
AC_DEFUN([PGAC_FUNC_GETTIMEOFDAY_1ARG],
[AC_CACHE_CHECK(whether gettimeofday takes only one argument,
pgac_cv_func_gettimeofday_1arg,
[AC_TRY_COMPILE([#include <sys/time.h>],
[struct timeval *tp;
struct timezone *tzp;
gettimeofday(tp,tzp);],
[pgac_cv_func_gettimeofday_1arg=no],
[pgac_cv_func_gettimeofday_1arg=yes])])
if test x"$pgac_cv_func_gettimeofday_1arg" = xyes ; then
  AC_DEFINE(GETTIMEOFDAY_1ARG,, [Set to 1 if gettimeofday() takes only 1 argument])
fi])# PGAC_FUNC_GETTIMEOFDAY_1ARG


# PGAC_UNION_SEMUN
# ----------------
# Check if `union semun' exists. Define HAVE_UNION_SEMUN if so.
# If it doesn't then one could define it as
# union semun { int val; struct semid_ds *buf; unsigned short *array; }
AC_DEFUN([PGAC_UNION_SEMUN],
[AC_CACHE_CHECK(for union semun, pgac_cv_union_semun,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>],
  [union semun semun;],
  [pgac_cv_union_semun=yes],
  [pgac_cv_union_semun=no])])
if test x"$pgac_cv_union_semun" = xyes ; then
  AC_DEFINE(HAVE_UNION_SEMUN,, [Set to 1 if you have `union semun'])
fi])# PGAC_UNION_SEMUN


# PGAC_FUNC_POSIX_SIGNALS
# -----------------------
# Check to see if the machine has the POSIX signal interface. Define
# HAVE_POSIX_SIGNALS if so. Also set the output variable HAVE_POSIX_SIGNALS
# to yes or no.
#
# Note that this test only compiles a test program, it doesn't check
# whether the routines actually work. If that becomes a problem, make
# a fancier check.
AC_DEFUN([PGAC_FUNC_POSIX_SIGNALS],
[AC_CACHE_CHECK(for POSIX signal interface, pgac_cv_func_posix_signals,
[AC_TRY_LINK([#include <signal.h>
],
[struct sigaction act, oact;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(0, &act, &oact);],
[pgac_cv_func_posix_signals=yes],
[pgac_cv_func_posix_signals=no])])
if test x"$pgac_cv_func_posix_signals" = xyes ; then
  AC_DEFINE(HAVE_POSIX_SIGNALS,, [Set to 1 if you have the POSIX signal interface])
fi
HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
AC_SUBST(HAVE_POSIX_SIGNALS)])# PGAC_FUNC_POSIX_SIGNALS
# Macros to detect certain C++ features
# $Header: /cvsroot/pgsql/aclocal.m4,v 1.3 2000/06/14 18:17:24 petere Exp $


# PGAC_CLASS_STRING
# -----------------
# Look for class `string'. First look for the <string> header. If this
# is found a <string> header then it's probably safe to assume that
# class string exists.  If not, check to make sure that <string.h>
# defines class `string'.
AC_DEFUN([PGAC_CLASS_STRING],
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_CHECK_HEADER(string,
  [AC_DEFINE(HAVE_CXX_STRING_HEADER)])

if test x"$ac_cv_header_string" != xyes ; then
  AC_CACHE_CHECK([for class string in <string.h>],
    [pgac_cv_class_string_in_string_h],
    [AC_TRY_COMPILE([#include <stdio.h>
#include <stdlib.h>
#include <string.h>
],
      [string foo = "test"],
      [pgac_cv_class_string_in_string_h=yes],
      [pgac_cv_class_string_in_string_h=no])])

  if test x"$pgac_cv_class_string_in_string_h" != xyes ; then
    AC_MSG_ERROR([neither <string> nor <string.h> seem to define the C++ class \`string\'])
  fi
fi
AC_LANG_RESTORE])# PGAC_CLASS_STRING


# PGAC_CXX_NAMESPACE_STD
# ----------------------
# Check whether the C++ compiler understands `using namespace std'.
#
# Note 1: On at least some compilers, it will not work until you've
# included a header that mentions namespace std. Thus, include the
# usual suspects before trying it.
#
# Note 2: This test does not actually reveal whether the C++ compiler
# properly understands namespaces in all generality. (GNU C++ 2.8.1
# is one that doesn't.) However, we don't care.
AC_DEFUN([PGAC_CXX_NAMESPACE_STD],
[AC_REQUIRE([PGAC_CLASS_STRING])
AC_CACHE_CHECK([for namespace std in C++],
pgac_cv_cxx_namespace_std,
[
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE(
[#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_CXX_STRING_HEADER
#include <string>
#endif
using namespace std;
], [],
[pgac_cv_cxx_namespace_std=yes],
[pgac_cv_cxx_namespace_std=no])
AC_LANG_RESTORE])

if test $pgac_cv_cxx_namespace_std = yes ; then
    AC_DEFINE(HAVE_NAMESPACE_STD, 1, [Define to 1 if the C++ compiler understands `using namespace std'])
fi])# PGAC_CXX_NAMESPACE_STD
#
# Autoconf macros for configuring the build of Python extension modules
#
# $Header: /cvsroot/pgsql/aclocal.m4,v 1.3 2000/06/14 18:17:24 petere Exp $
#

# PGAC_PROG_PYTHON
# ----------------
# Look for Python and set the output variable `PYTHON'
# to `python' if found, empty otherwise.
AC_DEFUN([PGAC_PROG_PYTHON],
[AC_CHECK_PROG(PYTHON, python, python)])


# PGAC_PATH_PYTHONDIR
# -------------------
# Finds the names of various install dirs and helper files
# necessary to build a Python extension module.
#
# It would be nice if we could check whether the current setup allows
# the build of the shared module. Future project.
AC_DEFUN([PGAC_PATH_PYTHONDIR],
[AC_REQUIRE([PGAC_PROG_PYTHON])
[if test "${PYTHON+set}" = set ; then
  python_version=`${PYTHON} -c "import sys; print sys.version[:3]"`
  python_prefix=`${PYTHON} -c "import sys; print sys.prefix"`
  python_execprefix=`${PYTHON} -c "import sys; print sys.exec_prefix"`
  python_configdir="${python_execprefix}/lib/python${python_version}/config"
  python_moduledir="${python_prefix}/lib/python${python_version}"
  python_extmakefile="${python_configdir}/Makefile.pre.in"]

  AC_MSG_CHECKING(for Python extension makefile)
  if test -f "${python_extmakefile}" ; then
    AC_MSG_RESULT(found)
  else
    AC_MSG_RESULT(no)
    AC_MSG_ERROR(
[The Python extension makefile was expected at \`${python_extmakefile}\'
but does not exist. This means the Python module cannot be built automatically.])
  fi

  AC_SUBST(python_version)
  AC_SUBST(python_prefix)
  AC_SUBST(python_execprefix)
  AC_SUBST(python_configdir)
  AC_SUBST(python_moduledir)
  AC_SUBST(python_extmakefile)
else
  AC_MSG_ERROR([Python not found])
fi])# PGAC_PATH_PYTHONDIR
