postgres/config/c-library.m4

# Macros that test various C library quirks
# $PostgreSQL: pgsql/config/c-library.m4,v 1.31 2005/02/24 01:34:45 tgl 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;],
  [#ifndef __CYGWIN__
res = timezone / 60;
#else
res = _timezone / 60;
#endif],
  [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,, [Define to 1 if you have the global variable 'int timezone'.])
fi])# PGAC_VAR_INT_TIMEZONE


# PGAC_STRUCT_TIMEZONE
# ------------------
# Figure out how to get the current timezone.  If `struct tm' has a
# `tm_zone' member, define `HAVE_TM_ZONE'.  Also, if the
# external array `tzname' is found, define `HAVE_TZNAME'.
# This is the same as the standard macro AC_STRUCT_TIMEZONE, except that
# tzname[] is checked for regardless of whether we find tm_zone.
AC_DEFUN([PGAC_STRUCT_TIMEZONE],
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
#include <$ac_cv_struct_tm>
])
if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
  AC_DEFINE(HAVE_TM_ZONE, 1,
            [Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
             `HAVE_STRUCT_TM_TM_ZONE' instead.])
fi
AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
[AC_TRY_LINK(
[#include <time.h>
#ifndef tzname /* For SGI.  */
extern char *tzname[]; /* RS6000 and others reject char **tzname.  */
#endif
],
[atoi(*tzname);], ac_cv_var_tzname=yes, ac_cv_var_tzname=no)])
if test $ac_cv_var_tzname = yes; then
    AC_DEFINE(HAVE_TZNAME, 1,
              [Define to 1 if you have the external array `tzname'.])
fi
])# PGAC_STRUCT_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,, [Define to 1 if gettimeofday() takes only 1 argument.])
fi
AH_VERBATIM(GETTIMEOFDAY_1ARG_,
[@%:@ifdef GETTIMEOFDAY_1ARG
@%:@ define gettimeofday(a,b) gettimeofday(a)
@%:@endif])dnl
])# PGAC_FUNC_GETTIMEOFDAY_1ARG


# PGAC_FUNC_GETPWUID_R_5ARG
# ---------------------------
# Check if getpwuid_r() takes a fifth argument (later POSIX standard, not draft version)
# If so, define GETPWUID_R_5ARG
AC_DEFUN([PGAC_FUNC_GETPWUID_R_5ARG],
[AC_CACHE_CHECK(whether getpwuid_r takes a fifth argument,
pgac_func_getpwuid_r_5arg,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <pwd.h>],
[uid_t uid;
struct passwd *space;
char *buf;
size_t bufsize;
struct passwd **result;
getpwuid_r(uid, space, buf, bufsize, result);],
[pgac_func_getpwuid_r_5arg=yes],
[pgac_func_getpwuid_r_5arg=no])])
if test x"$pgac_func_getpwuid_r_5arg" = xyes ; then
  AC_DEFINE(GETPWUID_R_5ARG,, [Define to 1 if getpwuid_r() takes a 5th argument.])
fi
])# PGAC_FUNC_GETPWUID_R_5ARG


# PGAC_FUNC_STRERROR_R_INT
# ---------------------------
# Check if strerror_r() returns an int (SUSv3) rather than a char * (GNU libc)
# If so, define STRERROR_R_INT
AC_DEFUN([PGAC_FUNC_STRERROR_R_INT],
[AC_CACHE_CHECK(whether strerror_r returns int,
pgac_func_strerror_r_int,
[AC_TRY_COMPILE([#include <string.h>],
[#ifndef _AIX
int strerror_r(int, char *, size_t);
#else
/* Older AIX has 'int' for the third argument so we don't test the args. */
int strerror_r();
#endif],
[pgac_func_strerror_r_int=yes],
[pgac_func_strerror_r_int=no])])
if test x"$pgac_func_strerror_r_int" = xyes ; then
  AC_DEFINE(STRERROR_R_INT,, [Define to 1 if strerror_r() returns a int.])
fi
])# PGAC_FUNC_STRERROR_R_INT


# 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_CHECK_TYPES([union semun], [], [],
[#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>])])# PGAC_UNION_SEMUN


# PGAC_STRUCT_SOCKADDR_UN
# -----------------------
# If `struct sockaddr_un' exists, define HAVE_UNIX_SOCKETS.
# (Requires test for <sys/un.h>!)
AC_DEFUN([PGAC_STRUCT_SOCKADDR_UN],
[AC_CHECK_TYPES([struct sockaddr_un], [AC_DEFINE(HAVE_UNIX_SOCKETS, 1, [Define to 1 if you have unix sockets.])], [],
[#include <sys/types.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
])])# PGAC_STRUCT_SOCKADDR_UN


# PGAC_STRUCT_SOCKADDR_STORAGE
# ----------------------------
# If `struct sockaddr_storage' exists, define HAVE_STRUCT_SOCKADDR_STORAGE.
# If it is missing then one could define it.
AC_DEFUN([PGAC_STRUCT_SOCKADDR_STORAGE],
[AC_CHECK_TYPES([struct sockaddr_storage], [], [],
[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])])# PGAC_STRUCT_SOCKADDR_STORAGE

# PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS
# --------------------------------------
# Check the members of `struct sockaddr_storage'.  We need to know about
# ss_family and ss_len.  (Some platforms follow RFC 2553 and call them
# __ss_family and __ss_len.)  We also check struct sockaddr's sa_len;
# if we have to define our own `struct sockaddr_storage', this tells us
# whether we need to provide an ss_len field.
AC_DEFUN([PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS],
[AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family,
		   struct sockaddr_storage.__ss_family,
		   struct sockaddr_storage.ss_len,
		   struct sockaddr_storage.__ss_len,
		   struct sockaddr.sa_len], [], [],
[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])])# PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS


# PGAC_STRUCT_ADDRINFO
# -----------------------
# If `struct addrinfo' exists, define HAVE_STRUCT_ADDRINFO.
AC_DEFUN([PGAC_STRUCT_ADDRINFO],
[AC_CHECK_TYPES([struct addrinfo], [], [],
[#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
])])# PGAC_STRUCT_ADDRINFO


# 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"$pgac_cv_func_posix_signals" = xyes ; then
  AC_DEFINE(HAVE_POSIX_SIGNALS,, [Define to 1 if you have the POSIX signal interface.])
fi
HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
AC_SUBST(HAVE_POSIX_SIGNALS)])# PGAC_FUNC_POSIX_SIGNALS


# PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT
# ---------------------------------------
# Determine which format snprintf uses for long long int.  We handle
# %lld, %qd, %I64d.  The result is in shell variable
# LONG_LONG_INT_FORMAT.
#
# MinGW uses '%I64d', though gcc throws an warning with -Wall,
# while '%lld' doesn't generate a warning, but doesn't work.
#
AC_DEFUN([PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT],
[AC_MSG_CHECKING([snprintf format for long long int])
AC_CACHE_VAL(pgac_cv_snprintf_long_long_int_format,
[for pgac_format in '%lld' '%qd' '%I64d'; do
AC_TRY_RUN([#include <stdio.h>
typedef long long int ac_int64;
#define INT64_FORMAT "$pgac_format"

ac_int64 a = 20000001;
ac_int64 b = 40000005;

int does_int64_snprintf_work()
{
  ac_int64 c;
  char buf[100];

  if (sizeof(ac_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());
}],
[pgac_cv_snprintf_long_long_int_format=$pgac_format; break],
[],
[pgac_cv_snprintf_long_long_int_format=cross; break])
done])dnl AC_CACHE_VAL

LONG_LONG_INT_FORMAT=''

case $pgac_cv_snprintf_long_long_int_format in
  cross) AC_MSG_RESULT([cannot test (not on host machine)]);;
  ?*)    AC_MSG_RESULT([$pgac_cv_snprintf_long_long_int_format])
         LONG_LONG_INT_FORMAT=$pgac_cv_snprintf_long_long_int_format;;
  *)     AC_MSG_RESULT(none);;
esac])# PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT


# PGAC_FUNC_PRINTF_ARG_CONTROL
# ---------------------------------------
# Determine if printf supports %1$ argument selection, e.g. %5$ selects
# the fifth argument after the printf print string.
# This is not in the C99 standard, but in the Single Unix Specification (SUS).
# It is used in our language translation strings.
#
AC_DEFUN([PGAC_FUNC_PRINTF_ARG_CONTROL],
[AC_MSG_CHECKING([whether printf supports argument control])
AC_CACHE_VAL(pgac_cv_printf_arg_control,
[AC_TRY_RUN([#include <stdio.h>
#include <string.h>

int main()
{
  char buf[100];

  /* can it swap arguments? */
  snprintf(buf, 100, "%2\$d %1\$d", 3, 4);
  if (strcmp(buf, "4 3") != 0)
    return 1;
  return 0;
}],
[pgac_cv_printf_arg_control=yes],
[pgac_cv_printf_arg_control=no],
[pgac_cv_printf_arg_control=cross])
])dnl AC_CACHE_VAL
AC_MSG_RESULT([$pgac_cv_printf_arg_control])
])# PGAC_FUNC_PRINTF_ARG_CONTROL


# backport improved FUNC_LINK_TRY test from Autoconf 2.61, cf
# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=f50d0bd4c7d92fbabcd9169920a23889524790e7
# This is needed to avoid incorrect results when compiler does link-time
# optimization.

# AC_LANG_CALL(C)(PROLOGUE, FUNCTION)
# -----------------------------------
# Avoid conflicting decl of main.
m4_define([AC_LANG_CALL(C)],
[AC_LANG_PROGRAM([$1
m4_if([$2], [main], ,
[/* Override any GCC internal prototype to avoid an error.
   Use char because int might match the return type of a GCC
   builtin and then its argument prototype would still apply.  */
#ifdef __cplusplus
extern "C"
#endif
char $2 ();])], [return $2 ();])])


# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
# ----------------------------------
# Don't include <ctype.h> because on OSF/1 3.0 it includes
# <sys/types.h> which includes <sys/select.h> which contains a
# prototype for select.  Similarly for bzero.
#
# This test used to merely assign f=$1 in main(), but that was
# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,
# presumably on the basis that there's no need to do that store if the
# program is about to exit.  Conversely, the AIX linker optimizes an
# unused external declaration that initializes f=$1.  So this test
# program has both an external initialization of f, and a use of f in
# main that affects the exit status.
#
m4_define([AC_LANG_FUNC_LINK_TRY(C)],
[AC_LANG_PROGRAM(
[/* Define $1 to an innocuous variant, in case <limits.h> declares $1.
   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
#define $1 innocuous_$1

/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char $1 (); below.
    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
    <limits.h> exists even on freestanding compilers.  */

#ifdef __STDC__
# include <limits.h>
#else
# include <assert.h>
#endif

#undef $1

/* Override any GCC internal prototype to avoid an error.
   Use char because int might match the return type of a GCC
   builtin and then its argument prototype would still apply.  */
#ifdef __cplusplus
extern "C"
#endif
char $1 ();
/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined __stub_$1 || defined __stub___$1
choke me
#endif
], [return $1 ();])])