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e9c936ff38
eliminates a raft of portability issues, including whether sys_nerr exists, whether the platform has any valid negative errnos, etc. The downside is minimal: errno shouldn't ever contain an invalid value anyway, and if it does, reasonably modern versions of strerror will not choke. This rangecheck idea seemed good at the time, but it's clearly a net loss, and I apologize to all concerned for having ever put it in.
127 lines
4.4 KiB
Plaintext
127 lines
4.4 KiB
Plaintext
# Macros that test various C library quirks
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# $Header: /cvsroot/pgsql/config/c-library.m4,v 1.8 2001/01/22 23:28:50 tgl Exp $
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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_TRY_LINK([#include <time.h>
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int res;],
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[res = timezone / 60;],
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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"$pgac_cv_var_int_timezone" = xyes ; then
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AC_DEFINE(HAVE_INT_TIMEZONE,, [Set to 1 if you have the global variable timezone])
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fi])# PGAC_VAR_INT_TIMEZONE
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# PGAC_FUNC_GETTIMEOFDAY_1ARG
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# ---------------------------
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# Check if gettimeofday() has only one arguments. (Normal is two.)
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# If so, define GETTIMEOFDAY_1ARG.
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AC_DEFUN([PGAC_FUNC_GETTIMEOFDAY_1ARG],
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[AC_CACHE_CHECK(whether gettimeofday takes only one argument,
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pgac_cv_func_gettimeofday_1arg,
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[AC_TRY_COMPILE([#include <sys/time.h>],
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[struct timeval *tp;
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struct timezone *tzp;
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gettimeofday(tp,tzp);],
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[pgac_cv_func_gettimeofday_1arg=no],
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[pgac_cv_func_gettimeofday_1arg=yes])])
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if test x"$pgac_cv_func_gettimeofday_1arg" = xyes ; then
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AC_DEFINE(GETTIMEOFDAY_1ARG,, [Set to 1 if gettimeofday() takes only 1 argument])
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fi])# PGAC_FUNC_GETTIMEOFDAY_1ARG
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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_CACHE_CHECK(for union semun, pgac_cv_union_semun,
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>],
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[union semun semun;],
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[pgac_cv_union_semun=yes],
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[pgac_cv_union_semun=no])])
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if test x"$pgac_cv_union_semun" = xyes ; then
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AC_DEFINE(HAVE_UNION_SEMUN, 1, [Set to 1 if you have `union semun'])
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fi])# PGAC_UNION_SEMUN
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# PGAC_STRUCT_SOCKADDR_UN
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# -----------------------
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# If `struct sockaddr_un' exists, define HAVE_STRUCT_SOCKADDR_UN. If
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# it is missing then one could define it as { short int sun_family;
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# char sun_path[108]; }. (Requires test for <sys/un.h>!)
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AC_DEFUN([PGAC_STRUCT_SOCKADDR_UN],
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[AC_CACHE_CHECK([for struct sockaddr_un], pgac_cv_struct_sockaddr_un,
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[AC_TRY_COMPILE([#include <sys/types.h>
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#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif],
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[struct sockaddr_un un;],
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[pgac_cv_struct_sockaddr_un=yes],
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[pgac_cv_struct_sockaddr_un=no])])
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if test x"$pgac_cv_struct_sockaddr_un" = xyes; then
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AC_DEFINE(HAVE_STRUCT_SOCKADDR_UN, 1, [Set to 1 if you have `struct sockaddr_un'])
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fi])# PGAC_STRUCT_SOCKADDR_UN
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# PGAC_FUNC_POSIX_SIGNALS
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# -----------------------
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# Check to see if the machine has the POSIX signal interface. Define
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# HAVE_POSIX_SIGNALS if so. Also set the output variable HAVE_POSIX_SIGNALS
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# to yes or no.
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#
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# Note that this test only compiles a test program, it doesn't check
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# whether the routines actually work. If that becomes a problem, make
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# a fancier check.
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AC_DEFUN([PGAC_FUNC_POSIX_SIGNALS],
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[AC_CACHE_CHECK(for POSIX signal interface, pgac_cv_func_posix_signals,
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[AC_TRY_LINK([#include <signal.h>
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],
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[struct sigaction act, oact;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_RESTART;
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sigaction(0, &act, &oact);],
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[pgac_cv_func_posix_signals=yes],
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[pgac_cv_func_posix_signals=no])])
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if test x"$pgac_cv_func_posix_signals" = xyes ; then
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AC_DEFINE(HAVE_POSIX_SIGNALS,, [Set to 1 if you have the POSIX signal interface])
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fi
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HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
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AC_SUBST(HAVE_POSIX_SIGNALS)])# PGAC_FUNC_POSIX_SIGNALS
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# PGAC_HEADER_STRING
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# ------------------
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# Tests whether <string.h> and <strings.h> can both be included
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# (without generating warnings). This is mostly useful if you need
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# str[n]casecmp(), since this is not in the "standard" <string.h>
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# on some systems.
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AC_DEFUN([PGAC_HEADER_STRING],
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[AC_CACHE_CHECK([whether string.h and strings.h may both be included],
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[pgac_cv_header_strings_both],
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[AC_TRY_CPP(
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[#include <string.h>
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#include <strings.h>
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],
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[AC_TRY_COMPILE(
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[#include <string.h>
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#include <strings.h>
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],
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[int n = strcasecmp("a", "b");],
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[pgac_cv_header_strings_both=yes],
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[pgac_cv_header_strings_both=no])],
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[pgac_cv_header_strings_both=no])])
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if test x"$pgac_cv_header_strings_both" = x"yes"; then
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AC_DEFINE([STRING_H_WITH_STRINGS_H], 1,
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[Define if string.h and strings.h may both be included])
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fi])
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