7871a36255
The method we've traditionally used, of redeclaring strerror_r() to
see if the compiler complains of inconsistent declarations, turns out
not to work reliably because some compilers only report a warning,
not an error. Amazingly, this has gone undetected for years, even
though it certainly breaks our detection of whether strerror_r
succeeded.
Let's instead test whether the compiler will take the result of
strerror_r() as a switch() argument. It's possible this won't
work universally either, but it's the best idea I could come up with
on the spur of the moment.
Back-patch of commit 751f532b9. Buildfarm results indicate that only
icc-on-Linux actually has an issue here; perhaps the lack of field
reports indicates that people don't build PG for production that way.
Discussion: https://postgr.es/m/10877.1537993279@sss.pgh.pa.us
299 lines
9.6 KiB
Plaintext
299 lines
9.6 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"$pgac_cv_var_int_timezone" = xyes ; then
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AC_DEFINE(HAVE_INT_TIMEZONE, 1,
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[Define to 1 if you have the global variable 'int timezone'.])
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fi])# PGAC_VAR_INT_TIMEZONE
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# PGAC_STRUCT_TIMEZONE
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# ------------------
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# Figure out how to get the current timezone. If `struct tm' has a
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# `tm_zone' member, define `HAVE_TM_ZONE'. Also, if the
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# external array `tzname' is found, define `HAVE_TZNAME'.
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# This is the same as the standard macro AC_STRUCT_TIMEZONE, except that
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# tzname[] is checked for regardless of whether we find tm_zone.
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AC_DEFUN([PGAC_STRUCT_TIMEZONE],
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[AC_REQUIRE([AC_STRUCT_TM])dnl
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AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
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#include <$ac_cv_struct_tm>
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])
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if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
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AC_DEFINE(HAVE_TM_ZONE, 1,
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[Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
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`HAVE_STRUCT_TM_TM_ZONE' instead.])
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fi
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AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM(
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[[#include <stdlib.h>
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#include <time.h>
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#ifndef tzname /* For SGI. */
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extern char *tzname[]; /* RS6000 and others reject char **tzname. */
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#endif
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]],
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[atoi(*tzname);])], ac_cv_var_tzname=yes, ac_cv_var_tzname=no)])
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if test $ac_cv_var_tzname = yes; then
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AC_DEFINE(HAVE_TZNAME, 1,
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[Define to 1 if you have the external array `tzname'.])
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fi
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])# PGAC_STRUCT_TIMEZONE
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# PGAC_FUNC_GETTIMEOFDAY_1ARG
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# ---------------------------
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# Check if gettimeofday() has only one arguments. (Normal is two.)
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# If so, define GETTIMEOFDAY_1ARG.
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AC_DEFUN([PGAC_FUNC_GETTIMEOFDAY_1ARG],
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[AC_CACHE_CHECK(whether gettimeofday takes only one argument,
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pgac_cv_func_gettimeofday_1arg,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/time.h>],
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[struct timeval *tp;
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struct timezone *tzp;
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gettimeofday(tp,tzp);])],
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[pgac_cv_func_gettimeofday_1arg=no],
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[pgac_cv_func_gettimeofday_1arg=yes])])
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if test x"$pgac_cv_func_gettimeofday_1arg" = xyes ; then
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AC_DEFINE(GETTIMEOFDAY_1ARG, 1,
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[Define to 1 if gettimeofday() takes only 1 argument.])
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fi
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AH_VERBATIM(GETTIMEOFDAY_1ARG_,
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[@%:@ifdef GETTIMEOFDAY_1ARG
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@%:@ define gettimeofday(a,b) gettimeofday(a)
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@%:@endif])dnl
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])# PGAC_FUNC_GETTIMEOFDAY_1ARG
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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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#ifdef HAVE_SYS_IPC_H
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#include <sys/ipc.h>
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#endif
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#ifdef HAVE_SYS_SEM_H
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#include <sys/sem.h>
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#endif])])# PGAC_UNION_SEMUN
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# PGAC_STRUCT_SOCKADDR_UN
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# -----------------------
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# If `struct sockaddr_un' exists, define HAVE_UNIX_SOCKETS.
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# (Requires test for <sys/un.h>!)
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AC_DEFUN([PGAC_STRUCT_SOCKADDR_UN],
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[AC_CHECK_TYPE([struct sockaddr_un], [AC_DEFINE(HAVE_UNIX_SOCKETS, 1, [Define to 1 if you have unix sockets.])], [],
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[#include <sys/types.h>
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#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
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])])# PGAC_STRUCT_SOCKADDR_UN
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# PGAC_STRUCT_SOCKADDR_STORAGE
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# ----------------------------
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# If `struct sockaddr_storage' exists, define HAVE_STRUCT_SOCKADDR_STORAGE.
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# If it is missing then one could define it.
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AC_DEFUN([PGAC_STRUCT_SOCKADDR_STORAGE],
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[AC_CHECK_TYPES([struct sockaddr_storage], [], [],
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[#include <sys/types.h>
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#include <sys/socket.h>
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])])# PGAC_STRUCT_SOCKADDR_STORAGE
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# PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS
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# --------------------------------------
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# Check the members of `struct sockaddr_storage'. We need to know about
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# ss_family and ss_len. (Some platforms follow RFC 2553 and call them
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# __ss_family and __ss_len.) We also check struct sockaddr's sa_len;
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# if we have to define our own `struct sockaddr_storage', this tells us
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# whether we need to provide an ss_len field.
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AC_DEFUN([PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS],
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[AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family,
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struct sockaddr_storage.__ss_family,
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struct sockaddr_storage.ss_len,
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struct sockaddr_storage.__ss_len,
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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_STORAGE_MEMBERS
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# PGAC_STRUCT_ADDRINFO
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# -----------------------
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# If `struct addrinfo' exists, define HAVE_STRUCT_ADDRINFO.
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AC_DEFUN([PGAC_STRUCT_ADDRINFO],
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[AC_CHECK_TYPES([struct addrinfo], [], [],
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[#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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])])# PGAC_STRUCT_ADDRINFO
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# PGAC_FUNC_SNPRINTF_ARG_CONTROL
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# ---------------------------------------
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# Determine if snprintf supports %1$ argument selection, e.g. %5$ selects
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# the fifth argument after the printf format string.
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# This is not in the C99 standard, but in the Single Unix Specification (SUS).
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# It is used in our language translation strings.
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#
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AC_DEFUN([PGAC_FUNC_SNPRINTF_ARG_CONTROL],
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[AC_MSG_CHECKING([whether snprintf supports argument control])
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AC_CACHE_VAL(pgac_cv_snprintf_arg_control,
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[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
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#include <string.h>
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int main()
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{
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char buf[100];
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/* can it swap arguments? */
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snprintf(buf, 100, "%2\$d %1\$d", 3, 4);
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if (strcmp(buf, "4 3") != 0)
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return 1;
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return 0;
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}]])],
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[pgac_cv_snprintf_arg_control=yes],
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[pgac_cv_snprintf_arg_control=no],
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[pgac_cv_snprintf_arg_control=cross])
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])dnl AC_CACHE_VAL
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AC_MSG_RESULT([$pgac_cv_snprintf_arg_control])
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])# PGAC_FUNC_SNPRINTF_ARG_CONTROL
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# PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT
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# ---------------------------------------
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# Determine if snprintf supports the z length modifier for printing
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# size_t-sized variables. That's supported by C99 and POSIX but not
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# all platforms play ball, so we must test whether it's working.
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#
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AC_DEFUN([PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT],
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[AC_MSG_CHECKING([whether snprintf supports the %z modifier])
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AC_CACHE_VAL(pgac_cv_snprintf_size_t_support,
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[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
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#include <string.h>
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int main()
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{
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char bufz[100];
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char buf64[100];
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/*
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* Print the largest unsigned number fitting in a size_t using both %zu
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* and the previously-determined format for 64-bit integers. Note that
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* we don't run this code unless we know snprintf handles 64-bit ints.
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*/
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bufz[0] = '\0'; /* in case snprintf fails to emit anything */
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snprintf(bufz, sizeof(bufz), "%zu", ~((size_t) 0));
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snprintf(buf64, sizeof(buf64), "%" INT64_MODIFIER "u",
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(unsigned PG_INT64_TYPE) ~((size_t) 0));
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if (strcmp(bufz, buf64) != 0)
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return 1;
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return 0;
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}]])],
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[pgac_cv_snprintf_size_t_support=yes],
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[pgac_cv_snprintf_size_t_support=no],
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[pgac_cv_snprintf_size_t_support=cross])
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])dnl AC_CACHE_VAL
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AC_MSG_RESULT([$pgac_cv_snprintf_size_t_support])
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])# PGAC_FUNC_SNPRINTF_SIZE_T_SUPPORT
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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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