ipv6 in guile 1.5.6: configure bug and fix

[Greg Troxel <gdt@ir.bbn.com>]

This configure check:

  AC_MSG_CHECKING(for working IPv6 support)
  AC_CACHE_VAL(guile_cv_have_ipv6,
  [AC_TRY_COMPILE([#include <netinet/in.h>
  #include <sys/socket.h>],
  [struct sockaddr_in6 a;  a.sin6_family = AF_INET6;],
  guile_cv_have_ipv6=yes, guile_cv_have_ipv6=no)])
  AC_MSG_RESULT($guile_cv_have_ipv6)
  if test $guile_cv_have_ipv6 = yes; then
    AC_DEFINE(HAVE_IPV6)
  fi

loses on NetBSD 1.5.2-stable (i.e., fails to declare HAVE_IPV6).  This
is because the test does not include <sys/types.h>, which man inet6
indicates should be included, and the test program fails with syntax
errors due to lacking u_int8_t etc.

RFC2553 does not appear to mandate including <sys/types.h>, so perhaps
this is a NetBSD bug, but I think it's good for guile to accomodate
it.  Perhaps the include of sys/types.h should be protected by a
HAVE_SYS_TYPES_H conditional, so as not to break systems without
sys/types.h that work with just netinet/in.h.

The following patch (only tested the configure patch because autoconf
is at 2.13 on the system in question) caused configure to define
HAVE_IPV6.

Index: configure
===================================================================
RCS file: /QUIST-CVS/guile/configure,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 configure
--- configure	2002/03/04 23:33:18	1.1.1.1
+++ configure	2002/03/13 13:22:36
@@ -11261,6 +11261,7 @@
   cat >conftest.$ac_ext <<_ACEOF
 #line 11262 "configure"
 #include "confdefs.h"
+#include <sys/types.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
 int
Index: configure.in
===================================================================
RCS file: /QUIST-CVS/guile/configure.in,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 configure.in
--- configure.in	2002/03/04 23:24:38	1.1.1.1
+++ configure.in	2002/03/13 13:20:26
@@ -325,7 +325,8 @@
 
 AC_MSG_CHECKING(for working IPv6 support)
 AC_CACHE_VAL(guile_cv_have_ipv6,
-[AC_TRY_COMPILE([#include <netinet/in.h>
+[AC_TRY_COMPILE([#include <sys/types.h>
+#include <netinet/in.h>
 #include <sys/socket.h>],
 [struct sockaddr_in6 a;  a.sin6_family = AF_INET6;],
 guile_cv_have_ipv6=yes, guile_cv_have_ipv6=no)])

With this patch, guile 1.5.6 builds and make check gives (on an i386):

Testing /home/gdt/QUIST-current/guile/pre-inst-guile ...
with GUILE_LOAD_PATH=/home/gdt/QUIST-current/guile/test-suite
ERROR: regexp.test: regexp-substitute/global: ("" "" ""): port is string port - arguments: ((regular-expression-syntax "make-regexp" "empty (sub)expression" #f #f))
ERROR: regexp.test: regexp-substitute/global: ("" "" ""): port is #f - arguments: ((regular-expression-syntax "make-regexp" "empty (sub)expression" #f #f))
ERROR: srfi-19.test: SRFI date/time library: #<procedure time-utc->date (time . tz-offset)> respects local DST if no TZ-OFFSET given - arguments: ((system-error "putenv" "~A" ("No such file or directory") (2)))
FAIL: syncase.test: (ice-9 syncase) loads

Totals for this test run:
passes:                 2112
failures:               1
unexpected passes:      0
expected failures:      17
unresolved test cases:  0
untested test cases:    0
unsupported test cases: 9
errors:                 3

FAIL: check-guile
===================
1 of 1 tests failed
===================
gmake[2]: *** [check-TESTS] Error 1
gmake[2]: Leaving directory `/home/gdt/QUIST-current/guile'
gmake[1]: *** [check-am] Error 2
gmake[1]: Leaving directory `/home/gdt/QUIST-current/guile'
gmake: *** [check-recursive] Error 1

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