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Unix/Linux 网络时间协议版本3 Network Time Protocol Version 3 (NTP) distribution for Unix systems

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To: [e-mail]
Subject: Bugfix for xntpd configuration w/ non-ANSI preprocessors
Reply-To: [e-mail]
Date: Thu, 31 Oct 1996 14:53:22 +1100
From: Paul Russell <[e-mail]>


Hi David,

	I recently tried to make xntpd3-5.86 on sparc-sun-sunos4.1.3_U1,
and the configuration came out wrong; I noticed when the compile failed
in xntpd/ntp_io.c due to MCAST being defined - it shouldn't be.

	SunOS 4 uses a non-ansi C preprocessor, which does not grok
preprocessor directives which are preceeded by whitespace; the test

AC_CACHE_CHECK(for kernel multicast support, ac_cv_var_mcast,
 AC_EGREP_CPP(yes,
  [#include <netinet/in.h>
   #ifdef IP_ADD_MEMBERSHIP
   yes
   #endif
  ], ac_cv_var_mcast=yes, ac_cv_var_mcast=no))

was passing straight through the preprocessor without modification of
the #ifdef and #endif lines, due to the whitespace problem.

Here is a patch (tested on sparc-sun-sunos4.1.3_U1) which fixes this
and other tests on whitespace-challenged preprocessors:
----------------------------------------------------------------Cut Here
*** configure.in.~1~	Wed Sep  4 13:40:33 1996
--- configure.in	Thu Oct 31 13:59:39 1996
***************
*** 294,302 ****
  AC_CACHE_CHECK(for SIGIO, ac_cv_hdr_def_sigio,
   AC_EGREP_CPP(yes,
    [#include <signal.h>
!   #ifdef SIGIO
     yes
!   #endif
    ], ac_cv_hdr_def_sigio=yes, ac_cv_hdr_def_sigio=no))
  
  dnl Override those system that have a losing SIGIO
--- 294,302 ----
  AC_CACHE_CHECK(for SIGIO, ac_cv_hdr_def_sigio,
   AC_EGREP_CPP(yes,
    [#include <signal.h>
! #ifdef SIGIO
     yes
! #endif
    ], ac_cv_hdr_def_sigio=yes, ac_cv_hdr_def_sigio=no))
  
  dnl Override those system that have a losing SIGIO
***************
*** 327,335 ****
  AC_CACHE_CHECK(for SIGPOLL, ac_cv_hdr_def_sigpoll,
   AC_EGREP_CPP(yes,
   [#include <signal.h>
!  #ifdef SIGPOLL
    yes
!  #endif
   ], ac_cv_hdr_def_sigpoll=yes, ac_cv_hdr_def_sigpoll=no))
  
  AC_CACHE_CHECK(if we can use SIGPOLL for UDP I/O, ac_cv_var_use_udp_sigpoll,
--- 327,335 ----
  AC_CACHE_CHECK(for SIGPOLL, ac_cv_hdr_def_sigpoll,
   AC_EGREP_CPP(yes,
   [#include <signal.h>
! #ifdef SIGPOLL
    yes
! #endif
   ], ac_cv_hdr_def_sigpoll=yes, ac_cv_hdr_def_sigpoll=no))
  
  AC_CACHE_CHECK(if we can use SIGPOLL for UDP I/O, ac_cv_var_use_udp_sigpoll,
***************
*** 485,493 ****
  AC_CACHE_CHECK(for kernel multicast support, ac_cv_var_mcast,
   AC_EGREP_CPP(yes,
    [#include <netinet/in.h>
!   #ifdef IP_ADD_MEMBERSHIP
     yes
!   #endif
    ], ac_cv_var_mcast=yes, ac_cv_var_mcast=no))
  case "$ac_cv_var_mcast" in
   yes) AC_DEFINE(MCAST) ;;
--- 485,493 ----
  AC_CACHE_CHECK(for kernel multicast support, ac_cv_var_mcast,
   AC_EGREP_CPP(yes,
    [#include <netinet/in.h>
! #ifdef IP_ADD_MEMBERSHIP
     yes
! #endif
    ], ac_cv_var_mcast=yes, ac_cv_var_mcast=no))
  case "$ac_cv_var_mcast" in
   yes) AC_DEFINE(MCAST) ;;
***************
*** 501,509 ****
      ;;
    *) AC_EGREP_CPP(yes,
       [#include <sys/syscall.h>
!       #if defined(SYS_ntp_gettime) && defined(SYS_ntp_adjtime)
         yes
!       #endif
        ], ac_cv_var_ntp_syscalls=kernel)
       ;;
   esac])
--- 501,509 ----
      ;;
    *) AC_EGREP_CPP(yes,
       [#include <sys/syscall.h>
! #if defined(SYS_ntp_gettime) && defined(SYS_ntp_adjtime)
         yes
! #endif
        ], ac_cv_var_ntp_syscalls=kernel)
       ;;
   esac])
***************
*** 593,601 ****
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
!          #ifdef TIOCMBIS
           yes
!          #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
--- 593,601 ----
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
! #ifdef TIOCMBIS
           yes
! #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
***************
*** 710,718 ****
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
!          #ifdef TIOCMBIS
           yes
!          #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
--- 710,718 ----
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
! #ifdef TIOCMBIS
           yes
! #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
***************
*** 838,846 ****
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
!          #ifdef TIOCMBIS
           yes
!          #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
--- 838,846 ----
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
! #ifdef TIOCMBIS
           yes
! #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
***************
*** 963,971 ****
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
!          #ifdef TIOCMBIS
           yes
!          #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
--- 963,971 ----
      [ntp_ok=$enableval],
      [AC_EGREP_CPP(yes,
          [#include <termios.h>
! #ifdef TIOCMBIS
           yes
! #endif
           ], ntp_ok=$ntp_eac, ntp_ok=no)])
  if test "$ntp_ok" = "yes"; then
      ntp_refclock=yes
----------------------------------------------------------------End Patch

Hope this helps,
Paul.
--
[e-mail]                  "Engineer? So you drive trains?"
Lies, damned lies, and out-of-date documentation.
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