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Document (a few) differences from the GNU one.

(with hope for jmc@ come & fix my bad wording)

.\"	$OpenBSD: libtool.1,v 1.2 2017/01/01 18:51:40 zhuk Exp $
.\"
.\" Copyright (c) 2012 Marc Espie <espie@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\"
.Dd $Mdocdate: January 1 2017 $
.Dt LIBTOOL 1
.Os
.Sh NAME
.Nm libtool
.Nd compile and link complex libraries
.Sh DESCRIPTION
.Nm
is supposed to be a drop-in replacement for the eponymous GNU project.
The following differences in behaviour with GNU Libtool are intentional:
.Bl -bullet
.It
Relative
.Ar -L
paths are put before absolute ones.
This allows to fix many (but not all, unfortunately) issues when software
links to libraries already installed instead of those just built, because,
e.g.,
.Ar -L/usr/local/lib
comes before
.Ar -L../libfoo .
.It
Extra (duplicate)
.Ar -L
and
.Ar -l
items are stripped from link command line.
.It
When both
.Ar -lstdc++
and
.Ar -lestdc++
are encountered in link command line, only the latter is kept.
.El