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postgresql/config/c-library.m4
Tom Lane a65e086453 Remove support for Unix systems without the POSIX signal APIs. 
Remove configure's checks for HAVE_POSIX_SIGNALS, HAVE_SIGPROCMASK, and
HAVE_SIGSETJMP.  These APIs are required by the Single Unix Spec v2
(POSIX 1997), which we generally consider to define our minimum required
set of Unix APIs.  Moreover, no buildfarm member has reported not having
them since 2012 or before, which means that even if the code is still live
somewhere, it's untested --- and we've made plenty of signal-handling
changes of late.  So just take these APIs as given and save the cycles for
configure probes for them.

However, we can't remove as much C code as I'd hoped, because the Windows
port evidently still uses the non-POSIX code paths for signal masking.
Since we're largely emulating these BSD-style APIs for Windows anyway, it
might be a good thing to switch over to POSIX-like notation and thereby
remove a few more #ifdefs.  But I'm not in a position to code or test that.
In the meantime, we can at least make things a bit more transparent by
testing for WIN32 explicitly in these places.
2015-08-31 12:56:10 -04:00

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# Macros that test various C library quirks
# config/c-library.m4
# 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_LINK_IFELSE([AC_LANG_PROGRAM([#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"$pgac_cv_var_int_timezone" = xyes ; then
AC_DEFINE(HAVE_INT_TIMEZONE, 1,
[Define to 1 if you have the global variable 'int timezone'.])
fi])# PGAC_VAR_INT_TIMEZONE
# PGAC_STRUCT_TIMEZONE
# ------------------
# Figure out how to get the current timezone. If `struct tm' has a
# `tm_zone' member, define `HAVE_TM_ZONE'. Also, if the
# external array `tzname' is found, define `HAVE_TZNAME'.
# This is the same as the standard macro AC_STRUCT_TIMEZONE, except that
# tzname[] is checked for regardless of whether we find tm_zone.
AC_DEFUN([PGAC_STRUCT_TIMEZONE],
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
#include <$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_LINK_IFELSE([AC_LANG_PROGRAM(
[[#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 $ac_cv_var_tzname = yes; then
AC_DEFINE(HAVE_TZNAME, 1,
[Define to 1 if you have the external array `tzname'.])
fi
])# PGAC_STRUCT_TIMEZONE
# PGAC_FUNC_GETTIMEOFDAY_1ARG
# ---------------------------
# Check if gettimeofday() has only one arguments. (Normal is two.)
# If so, define GETTIMEOFDAY_1ARG.
AC_DEFUN([PGAC_FUNC_GETTIMEOFDAY_1ARG],
[AC_CACHE_CHECK(whether gettimeofday takes only one argument,
pgac_cv_func_gettimeofday_1arg,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/time.h>],
[struct timeval *tp;
struct timezone *tzp;
gettimeofday(tp,tzp);])],
[pgac_cv_func_gettimeofday_1arg=no],
[pgac_cv_func_gettimeofday_1arg=yes])])
if test x"$pgac_cv_func_gettimeofday_1arg" = xyes ; then
AC_DEFINE(GETTIMEOFDAY_1ARG, 1,
[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_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_cv_func_strerror_r_int,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#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_cv_func_strerror_r_int=yes],
[pgac_cv_func_strerror_r_int=no])])
if test x"$pgac_cv_func_strerror_r_int" = xyes ; then
AC_DEFINE(STRERROR_R_INT, 1,
[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_TYPE([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_SNPRINTF_LONG_LONG_INT_MODIFIER
# ---------------------------------------
# Determine which length modifier snprintf uses for long long int. We
# handle ll, q, and I64. The result is in shell variable
# LONG_LONG_INT_MODIFIER.
#
# 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_MODIFIER],
[AC_MSG_CHECKING([snprintf length modifier for long long int])
AC_CACHE_VAL(pgac_cv_snprintf_long_long_int_modifier,
[for pgac_modifier in 'll' 'q' 'I64'; do
AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
typedef long long int ac_int64;
#define INT64_FORMAT "%${pgac_modifier}d"
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_modifier=$pgac_modifier; break],
[],
[pgac_cv_snprintf_long_long_int_modifier=cross; break])
done])dnl AC_CACHE_VAL
LONG_LONG_INT_MODIFIER=''
case $pgac_cv_snprintf_long_long_int_modifier in
cross) AC_MSG_RESULT([cannot test (not on host machine)]);;
?*) AC_MSG_RESULT([$pgac_cv_snprintf_long_long_int_modifier])
LONG_LONG_INT_MODIFIER=$pgac_cv_snprintf_long_long_int_modifier;;
*) AC_MSG_RESULT(none);;
esac])# PGAC_FUNC_SNPRINTF_LONG_LONG_INT_MODIFIER
# PGAC_FUNC_SNPRINTF_ARG_CONTROL
# ---------------------------------------
# Determine if snprintf supports %1$ argument selection, e.g. %5$ selects
# the fifth argument after the printf format 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_SNPRINTF_ARG_CONTROL],
[AC_MSG_CHECKING([whether snprintf supports argument control])
AC_CACHE_VAL(pgac_cv_snprintf_arg_control,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[#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_snprintf_arg_control=yes],
[pgac_cv_snprintf_arg_control=no],
[pgac_cv_snprintf_arg_control=cross])
])dnl AC_CACHE_VAL
AC_MSG_RESULT([$pgac_cv_snprintf_arg_control])
])# PGAC_FUNC_SNPRINTF_ARG_CONTROL
# PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT
# ---------------------------------------
# Determine if snprintf supports the z length modifier for printing
# size_t-sized variables. That's supported by C99 and POSIX but not
# all platforms play ball, so we must test whether it's working.
#
AC_DEFUN([PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT],
[AC_MSG_CHECKING([whether snprintf supports the %z modifier])
AC_CACHE_VAL(pgac_cv_snprintf_size_t_support,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
#include <string.h>
int main()
{
char bufz[100];
char buf64[100];
/*
* Print the largest unsigned number fitting in a size_t using both %zu
* and the previously-determined format for 64-bit integers. Note that
* we don't run this code unless we know snprintf handles 64-bit ints.
*/
bufz[0] = '\0'; /* in case snprintf fails to emit anything */
snprintf(bufz, sizeof(bufz), "%zu", ~((size_t) 0));
snprintf(buf64, sizeof(buf64), "%" INT64_MODIFIER "u",
(unsigned PG_INT64_TYPE) ~((size_t) 0));
if (strcmp(bufz, buf64) != 0)
return 1;
return 0;
}]])],
[pgac_cv_snprintf_size_t_support=yes],
[pgac_cv_snprintf_size_t_support=no],
[pgac_cv_snprintf_size_t_support=cross])
])dnl AC_CACHE_VAL
AC_MSG_RESULT([$pgac_cv_snprintf_size_t_support])
])# PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT
# PGAC_TYPE_LOCALE_T
# ------------------
# Check for the locale_t type and find the right header file. Mac OS
# X needs xlocale.h; standard is locale.h, but glibc also has an
# xlocale.h file that we should not use.
#
AC_DEFUN([PGAC_TYPE_LOCALE_T],
[AC_CACHE_CHECK([for locale_t], pgac_cv_type_locale_t,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[#include <locale.h>
locale_t x;],
[])],
[pgac_cv_type_locale_t=yes],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[#include <xlocale.h>
locale_t x;],
[])],
[pgac_cv_type_locale_t='yes (in xlocale.h)'],
[pgac_cv_type_locale_t=no])])])
if test "$pgac_cv_type_locale_t" != no; then
AC_DEFINE(HAVE_LOCALE_T, 1,
[Define to 1 if the system has the type `locale_t'.])
fi
if test "$pgac_cv_type_locale_t" = 'yes (in xlocale.h)'; then
AC_DEFINE(LOCALE_T_IN_XLOCALE, 1,
[Define to 1 if `locale_t' requires <xlocale.h>.])
fi])])# PGAC_HEADER_XLOCALE
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