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Re: UNICOS changes

From: Paul Eggert
Subject: Re: UNICOS changes
Date: Wed, 02 Feb 2005 15:48:51 -0800
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

Thanks.  There being no reply by the Fortran experts, I installed
those code changes.  I reworded the doc a bit, resulting in the
following patch instead.

Index: autoconf.texi
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.871
retrieving revision 1.872
diff -p -u -r1.871 -r1.872
--- autoconf.texi       1 Feb 2005 20:43:42 -0000       1.871
+++ autoconf.texi       2 Feb 2005 23:47:34 -0000       1.872
@@ -11855,6 +11855,12 @@ Patterns should not include the separato
 of a character class.  In conformance with Posix, the Cray
 @command{sed} will reject @samp{s/[^/]*$//}: use @samp{s,[^/]*$,,}.
+Avoid empty patterns within parentheses (i.e., @samp{\(\)}).  Posix is
+silent on whether they are allowed, and Unicos 9 @command{sed} rejects
+Unicos 9 @command{sed} loops endlessly on patterns like @samp{.*\n.*}.
 Sed scripts should not use branch labels longer than 8 characters and
 should not contain comments.

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