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141 lines
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141 lines
4.8 KiB
Plaintext
From nobody Wed Jul 2 19:28:31 1997
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X-From-Line: norm@connectware.ca Wed Jul 02 22:32:39 1997
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id AA21851; Wed, 2 Jul 1997 12:08:56 -0400
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Date: Wed, 2 Jul 1997 12:08:53 -0400 (EDT)
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From: Normand McGuire <norm@connectware.ca>
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To: Gordon Matzigkeit <gord@m-tech.ab.ca>
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Subject: Re: -lc_s shared libraries
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In-Reply-To: <86yb7qipsd.fsf_-_@trick.profitpress.com>
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Message-Id: <Pine.A32.3.91.970702113816.24858A-100000@castle.connectware.ca>
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Mime-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Xref: trick.profitpress.com mail.libtool:299
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Lines: 113
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X-Gnus-Article-Number: 1 Mon Nov 2 17:19:44 1998
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On 1 Jul 1997, Gordon Matzigkeit wrote:
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> Are you sure that on SCO Openserver 5 you need to specify
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> /lib/libc.so? From what I understood about that platform, specifying
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> `-lc' (which is what the C compiler does by default) is good enough,
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> and links in the shared version if it exists.
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>From my experience, definitely. Look below.
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> Do you know otherwise? Can you show the results of specific tests to
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> me that would prove your point?
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Here is a sample of a session demonstrating this on my system. I show the
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source code, default cc file and three compiles with three a.out file
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sizes. See for yourself:
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Script started on Wed Jul 2 11:21:58 1997
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$ cat t.c
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main()
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{
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printf("Hello, world\n");
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}
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$ cat /etc/default/cc
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# @(#) cc.default 20.1 94/12/04
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#
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# Copyright (C) The Santa Cruz Operation, Inc. 1994-1995.
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# This Module contains Proprietary Information of
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# The Santa Cruz Operation, and should be treated as Confidential.
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#
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# Core development /bin/cc reads /etc/default/cc.
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# Cross development /usr/ods30/bin/cc reads /etc/default/crossdevcc.
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# If a prefix is specified, cc reads /etc/default/<prefix>cc instead.
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#
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FLAGS=
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LIBS=
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$ cc t.c
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$ l a.out
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-rwxrwxr-x 1 root sys 46334 Jul 2 11:22 a.out
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$ cc t.c -lc
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$ l a.out
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-rwxrwxr-x 1 root sys 46334 Jul 2 11:22 a.out
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$ cc t.c /lib/libc.so
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$ l a.out
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-rwxrwxr-x 1 root sys 3988 Jul 2 11:22 a.out
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$ exit
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script done on Wed Jul 2 11:22:32 1997
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And believe me, this script session is not a fake.
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> The reason I'm asking is that I, too, would like to know how Autoconf
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> packages can best take advantage of shared libraries, especially in a
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> general, rather than a test-by-test way.
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The section of my configure.in script that takes care of shared libraries
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is short and not annoying to repeat. You may want to incorporate it into
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the AC_PROG_CC macro or create a new one for it. So far, I've seen only
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two kinds of behaviors regarding shared libraries: if they are not used
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automatically when invoking cc, just include them when linking the
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program. And it worked so far. However, you guys may have a whole lot
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more flavors of system to run on compared to me.
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Here is the portion of the shared library check in my configure.in script:
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# STEP 2 - Check for libraries
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AC_MSG_CHECKING([for libc.so])
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if test -r /lib/libc.so; then
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AC_MSG_RESULT([yes (/lib/libc.so)])
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LIBS="$LIBS /lib/libc.so"
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elif test -r /usr/lib/libc.so; then
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AC_MSG_RESULT([yes (/usr/lib/libc.so)])
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LIBS="$LIBS /usr/lib/libc.so"
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else
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AC_MSG_RESULT(no)
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AC_CHECK_LIB(c_s, main)
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fi
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> Could you be more specific when you mention `some other System V Unix
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> systems'? What are their canonical system names (i.e. *-*-sco3.2v4*)?
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By 'some other Unix systems' requiring that you explicitely specify the
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shared library name when linking the program, I meant specifically:
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o Bull Open Software (Unix System V Release 4, but don't remember if it is x86)
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o Interactive Unix System V/386 all versions
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o SCO Unix 3.2v4 and SCO OpenServer 5
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o Sun Solaris 2.3 / SunOS 5.3
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All others that we've compiled and run on will automatically use shared
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libraries when available, namely:
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IBM's AIX 3.2.* and 4.*
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HP's HPUX 8.*, 9.* and 10.*
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DEC Ultrix, OSF/1 and DEC Unix all versions tried
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DataGeneral's DGUX all versions tried
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Sequent's DYNIX/ptx 2.1 and 4
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Linux all versions tried
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SGI's Irix all versions tried
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NCR and AT&T Unix System V/386 Release 4
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Sun Solaris 2.4 (SunOS 5.4) and Solaris 2.5 (SunOS 5.5)
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SunOS 4.1*
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Unisys Unix System V/386
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Unixware all versions
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Normand McGuire
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