From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <743-406-3965@kylheku.com>
Received: from smtp-out-so.shaw.ca (smtp-out-so.shaw.ca [64.59.136.137])
 by sourceware.org (Postfix) with ESMTPS id B650F3857C67
 for <cygwin@cygwin.com>; Sun, 11 Oct 2020 02:32:24 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org B650F3857C67
Received: from kylheku.com ([70.79.163.252]) by shaw.ca with ESMTPA
 id RR9qkNilaLWW5RR9rk08Eq; Sat, 10 Oct 2020 20:32:24 -0600
X-Authority-Analysis: v=2.4 cv=Z5JSoFdA c=1 sm=1 tr=0 ts=5f826eb8
 a=95A0EdhkF1LMGt25d7h1IQ==:117 a=95A0EdhkF1LMGt25d7h1IQ==:17
 a=IkcTkHD0fZMA:10 a=SMorJkV_YP8A:10 a=afefHYAZSVUA:10
 a=VlcbR86_sxKHgt_W16sA:9 a=QEXdDO2ut3YA:10 a=Z5ABNNGmrOfJ6cZ5bIyy:22
 a=jd6J4Gguk5HxikPWLKER:22
Received: from www-data by kylheku.com with local (Exim 4.72)
 (envelope-from <743-406-3965@kylheku.com>) id 1kRR9q-0008Er-Kk
 for cygwin@cygwin.com; Sat, 10 Oct 2020 19:32:22 -0700
To: Cygwin <cygwin@cygwin.com>
Subject: Build spends a long time in "mkimport".
X-PHP-Originating-Script: 501:rcmail.php
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
 format=flowed
Content-Transfer-Encoding: quoted-printable
Date: Sat, 10 Oct 2020 19:32:22 -0700
From: "Kaz Kylheku (Cygwin)" <743-406-3965@kylheku.com>
Message-ID: <af9f360a0a782f3c4db698e9f4584d16@mail.kylheku.com>
X-Sender: 743-406-3965@kylheku.com
User-Agent: Roundcube Webmail/0.9.2
X-CMAE-Envelope: MS4xfKvlP+2NjQs+GLCJ9yrx3Pc9FE437b3moRKicJLdQBE/HjS904O2NhAIsUJQlKV8z/NpnZVOJ5YljSvP03MaERwcViLfOxfOsvIu4FKk99BHsMnCZDHZ
 /txgV0jEMZFg7uhw2H715lsskIjUu82ofrAeyu7awISoa1YmxginWkSG7CXZTD2Nzqvcsi0lUx72Ow==
X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,
 FROM_STARTS_WITH_NUMS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE,
 SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
 server2.sourceware.org
X-BeenThere: cygwin@cygwin.com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request@cygwin.com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin@cygwin.com>
List-Help: <mailto:cygwin-request@cygwin.com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request@cygwin.com?subject=subscribe>
X-List-Received-Date: Sun, 11 Oct 2020 02:32:26 -0000

Hi All,

When building the Cygwin DLL, this single step takes almost ten minutes:

   ../../.././winsup/cygwin/mkimport --cpu=3Di686 --ar=3Dar --as=3Das --nm=
=3Dnm=20
--objcopy=3Dobjcopy \
   --replace=3Datexit=3D --replace=3Dtimezone=3D --replace=3Duname=3Duname_=
x=20
--replace=3D__xdrrec_getrec=3D

   [ .. SNIP ... ]

   --replace=3Dtruncate=3D_truncate64 libcygwin.a cygdll.a=20
_cygwin_crt0_common.o \
   atexit.o cygwin_attach_dll.o cygwin_crt0.o dll_entry.o dll_main.o=20
dso_handle.o \
   libcmain.o premain0.o premain1.o premain2.o premain3.o=20
pseudo-reloc-dummy.o

What's puzzling is that there is very CPU activity during this time.=20
It's launching
some objcopy commands.

Is there some documentation that provides an overview of what exactly=20
this does,
other than studying its perl source code?

Maybe it can be sped up?

I'm going to have to cycle quite a few times on some changes, so this is=20
frustrating.