From e651af07a6e61976af131dba3d028bcf73312a6e Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Thu, 21 Oct 2010 12:24:30 -0600
Subject: build: work around glibc and libsigsegv bugs

* docs/m4.texinfo (Index macro): Expose strstr bug.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 doc/m4.texi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/m4.texi b/doc/m4.texi
index d4aa65e1..dbda71bb 100644
--- a/doc/m4.texi
+++ b/doc/m4.texi
@@ -6888,6 +6888,17 @@ index(`abc', `bc', `-4')
 @result{}1
 @end example
 
+@ignore
+@comment Expose a bug in the strstr() algorithm present in glibc
+@comment 2.9 through 2.12 and in gnulib up to Sep 2010.
+
+@example
+index(`;:11-:12-:12-:12-:12-:12-:12-:12-:12.:12.:12.:12.:12.:12.:12.:12.:12-:',
+`:12-:12-:12-:12-:12-:12-:12-:12-')
+@result{}-1
+@end example
+@end ignore
+
 @node Regexp
 @section Searching for regular expressions
 
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