2006-05-21  Paul Eggert  <address@hidden>
	and Ralf Wildenhues  <address@hidden>

	* lib/autoconf/programs.m4 (AC_PROG_SED): Catch script length
	limits in Solaris 8 /usr/ucb/sed by testing a long script.

Index: lib/autoconf/programs.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/programs.m4,v
retrieving revision 1.55
diff -u -r1.55 programs.m4
--- lib/autoconf/programs.m4	22 May 2006 10:37:15 -0000	1.55
+++ lib/autoconf/programs.m4	22 May 2006 10:55:33 -0000
@@ -812,11 +812,20 @@
 # as few characters as possible.  Prefer GNU sed if found.
 AC_DEFUN([AC_PROG_SED],
 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
-    [_AC_PATH_PROG_FEATURE_CHECK(SED, [sed gsed],
+    [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
+     dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
+     ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
+     for ac_i in 1 2 3 4 5 6 7; do
+       ac_script="$ac_script$as_nl$ac_script"
+     done
+     echo "$ac_script" | sed 99q >conftest.sed
+     $as_unset ac_script || ac_script= 
+     _AC_PATH_PROG_FEATURE_CHECK(SED, [sed gsed],
 	[_AC_FEATURE_CHECK_LENGTH([ac_path_SED], [ac_cv_path_SED],
-		["$ac_path_SED" -e 's/a$//'])])])
+		["$ac_path_SED" -f conftest.sed])])])
  SED="$ac_cv_path_SED"
- AC_SUBST([SED])
+ AC_SUBST([SED])dnl
+ rm -f conftest.sed
 ])# AC_PROG_SED