longlin2.test and AIX grep

[Ralf Wildenhues]

AIX grep has a 2048 character limit on the input lines.  Apparently, it
optimizes plain (non-regex) patterns, which enables it to work on longer
strings; but with non-plain patterns, it does not truncate the line, but
fail hard:

$ grep grepme Makefile.am >/dev/null; echo $?
0
$ grep .grepme Makefile.am >/dev/null; echo $?
grep: 0652-226 Maximum line length of 2048 exceeded.
2

So only a literal pattern works, but not the one used in longlin2.test.
Since longlin2.test seems to have been added to test Automake's wrapping
functionality rather than `grep', I think it's sufficient to just skip
this part: we can be reasonably sure the shell is able to create such
long lines (and even if it could not, it would not be what this test
wants to find out; that could be done by using 'tr', if desired).

So, OK to apply this patch, which allows longlin2.test to pass on
AIX <= 5.1 (5.2 seems to have a better grep)?

Cheers,
Ralf

        * tests/longlin2.test: Do not use `grep' on Makefile.am:
        it has long lines and is thus not a text file; AIX 5.1 grep
        fails to scan non-plain patterns from long lines.

Index: tests/longlin2.test
===================================================================
RCS file: /cvs/automake/automake/tests/longlin2.test,v
retrieving revision 1.2
diff -u -r1.2 longlin2.test
--- tests/longlin2.test 14 May 2005 20:28:55 -0000      1.2
+++ tests/longlin2.test 27 Apr 2006 17:34:38 -0000
@@ -1,5 +1,5 @@
 #! /bin/sh
-# Copyright (C) 2005  Free Software Foundation, Inc.
+# Copyright (C) 2005, 2006  Free Software Foundation, Inc.
 #
 # This file is part of GNU Automake.
 #
@@ -42,10 +42,10 @@
 EOF
 
 # The `FOO = ...' line is 2293-byte long.  More than what a POSIX
-# conforment system is expected to support.
+# conformant system is expected to support.  So do not use grep
+# on the non-text file.
 
-# (It's OK if grep truncates the long line.)
-grep $match Makefile.am
+# grep $match Makefile.am
 
 $ACLOCAL
 $AUTOMAKE