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64ef572c06
Remove four probes for members of sockaddr_storage. Keep only the probe for sockaddr's sa_len, which is enough for our two remaining places that know about _len fields: 1. ifaddr.c needs to know if sockaddr has sa_len to understand the result of ioctl(SIOCGIFCONF). Only AIX is still using the relevant code today, but it seems like a good idea to keep it compilable on Linux. 2. ip.c was testing for presence of ss_len to decide whether to fill in sun_len in our getaddrinfo_unix() function. It's just as good to test for sa_len. If you have one, you have them all. (The code in #2 isn't actually needed at all on several OSes I checked since modern versions ignore sa_len on input to system calls. Proving that's the case for all relevant OSes is left for another day, but wouldn't get rid of that last probe anyway if we still want it for #1.) Discussion: https://postgr.es/m/CA%2BhUKGJJjF2AqdU_Aug5n2MAc1gr%3DGykNjVBZq%2Bd6Jrcp3Dyvg%40mail.gmail.com
143 lines
4.4 KiB
Plaintext
143 lines
4.4 KiB
Plaintext
# Macros that test various C library quirks
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# config/c-library.m4
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# PGAC_VAR_INT_TIMEZONE
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# ---------------------
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# Check if the global variable `timezone' exists. If so, define
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# HAVE_INT_TIMEZONE.
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AC_DEFUN([PGAC_VAR_INT_TIMEZONE],
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[AC_CACHE_CHECK(for int timezone, pgac_cv_var_int_timezone,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <time.h>
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int res;],
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[#ifndef __CYGWIN__
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res = timezone / 60;
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#else
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res = _timezone / 60;
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#endif])],
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[pgac_cv_var_int_timezone=yes],
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[pgac_cv_var_int_timezone=no])])
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if test x"$pgac_cv_var_int_timezone" = xyes ; then
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AC_DEFINE(HAVE_INT_TIMEZONE, 1,
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[Define to 1 if you have the global variable 'int timezone'.])
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fi])# PGAC_VAR_INT_TIMEZONE
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# PGAC_STRUCT_TIMEZONE
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# ------------------
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# Figure out how to get the current timezone. If `struct tm' has a
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# `tm_zone' member, define `HAVE_STRUCT_TM_TM_ZONE'. Unlike the
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# standard macro AC_STRUCT_TIMEZONE, we don't check for `tzname[]' if
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# not found, since we don't use it. (We use `int timezone' as a
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# fallback.)
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AC_DEFUN([PGAC_STRUCT_TIMEZONE],
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[AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
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#include <time.h>
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])
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])# PGAC_STRUCT_TIMEZONE
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# PGAC_FUNC_STRERROR_R_INT
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# ---------------------------
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# Check if strerror_r() returns int (POSIX) rather than char * (GNU libc).
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# If so, define STRERROR_R_INT.
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# The result is uncertain if strerror_r() isn't provided,
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# but we don't much care.
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AC_DEFUN([PGAC_FUNC_STRERROR_R_INT],
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[AC_CACHE_CHECK(whether strerror_r returns int,
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pgac_cv_func_strerror_r_int,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <string.h>],
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[[char buf[100];
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switch (strerror_r(1, buf, sizeof(buf)))
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{ case 0: break; default: break; }
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]])],
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[pgac_cv_func_strerror_r_int=yes],
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[pgac_cv_func_strerror_r_int=no])])
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if test x"$pgac_cv_func_strerror_r_int" = xyes ; then
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AC_DEFINE(STRERROR_R_INT, 1,
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[Define to 1 if strerror_r() returns int.])
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fi
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])# PGAC_FUNC_STRERROR_R_INT
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# PGAC_UNION_SEMUN
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# ----------------
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# Check if `union semun' exists. Define HAVE_UNION_SEMUN if so.
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# If it doesn't then one could define it as
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# union semun { int val; struct semid_ds *buf; unsigned short *array; }
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AC_DEFUN([PGAC_UNION_SEMUN],
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[AC_CHECK_TYPES([union semun], [], [],
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[#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>
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])])# PGAC_UNION_SEMUN
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# PGAC_STRUCT_SOCKADDR_MEMBERS
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# ----------------------------
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# Check if struct sockaddr and subtypes have 4.4BSD-style length.
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AC_DEFUN([PGAC_STRUCT_SOCKADDR_SA_LEN],
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[AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [],
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[#include <sys/types.h>
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#include <sys/socket.h>
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])])# PGAC_STRUCT_SOCKADDR_MEMBERS
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# PGAC_TYPE_LOCALE_T
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# ------------------
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# Check for the locale_t type and find the right header file. macOS
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# needs xlocale.h; standard is locale.h, but glibc also has an
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# xlocale.h file that we should not use.
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#
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AC_DEFUN([PGAC_TYPE_LOCALE_T],
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[AC_CACHE_CHECK([for locale_t], pgac_cv_type_locale_t,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[#include <locale.h>
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locale_t x;],
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[])],
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[pgac_cv_type_locale_t=yes],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[#include <xlocale.h>
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locale_t x;],
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[])],
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[pgac_cv_type_locale_t='yes (in xlocale.h)'],
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[pgac_cv_type_locale_t=no])])])
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if test "$pgac_cv_type_locale_t" != no; then
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AC_DEFINE(HAVE_LOCALE_T, 1,
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[Define to 1 if the system has the type `locale_t'.])
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fi
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if test "$pgac_cv_type_locale_t" = 'yes (in xlocale.h)'; then
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AC_DEFINE(LOCALE_T_IN_XLOCALE, 1,
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[Define to 1 if `locale_t' requires <xlocale.h>.])
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fi])# PGAC_TYPE_LOCALE_T
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# PGAC_FUNC_WCSTOMBS_L
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# --------------------
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# Try to find a declaration for wcstombs_l(). It might be in stdlib.h
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# (following the POSIX requirement for wcstombs()), or in locale.h, or in
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# xlocale.h. If it's in the latter, define WCSTOMBS_L_IN_XLOCALE.
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#
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AC_DEFUN([PGAC_FUNC_WCSTOMBS_L],
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[AC_CACHE_CHECK([for wcstombs_l declaration], pgac_cv_func_wcstombs_l,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[#include <stdlib.h>
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#include <locale.h>],
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[#ifndef wcstombs_l
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(void) wcstombs_l;
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#endif])],
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[pgac_cv_func_wcstombs_l='yes'],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[#include <stdlib.h>
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#include <locale.h>
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#include <xlocale.h>],
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[#ifndef wcstombs_l
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(void) wcstombs_l;
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#endif])],
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[pgac_cv_func_wcstombs_l='yes (in xlocale.h)'],
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[pgac_cv_func_wcstombs_l='no'])])])
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if test "$pgac_cv_func_wcstombs_l" = 'yes (in xlocale.h)'; then
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AC_DEFINE(WCSTOMBS_L_IN_XLOCALE, 1,
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[Define to 1 if `wcstombs_l' requires <xlocale.h>.])
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fi])# PGAC_FUNC_WCSTOMBS_L
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