JiscMail Logo
Email discussion lists for the UK Education and Research communities

Help for STARDEV Archives


STARDEV Archives

STARDEV Archives


STARDEV@JISCMAIL.AC.UK


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

STARDEV Home

STARDEV Home

STARDEV  August 2004

STARDEV August 2004

Options

Subscribe or Unsubscribe

Subscribe or Unsubscribe

Log In

Log In

Get Password

Get Password

Subject:

Re: shared libraries on mac

From:

Tim Jenness <[log in to unmask]>

Reply-To:

Starlink development <[log in to unmask]>

Date:

Sat, 31 Jul 2004 13:45:39 -1000

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (55 lines)

On Fri, 30 Jul 2004, Tim Jenness wrote:

> Okay, the problem is clearly that libtool isn't even generating a link
> line to run. Nothing happens. It just makes softlinks to a file that was
> never even attempted to build. ie you get a shared library if CC is the
> linker and you don't get a shared library if FC is the linker.
>

Looking at this further now a new day has dawned:

 0. Linking shared libraries using gcc (ie changing the libxxx.la
    creation line to use $LINK rather than $FCLINK. Workss like a charm,
    presumably because
       - unresolved references (to the fortran runtime) are suppressed
       - they will all be resolved when the library is linked to an
         actual executable

 1. Libtool does not attempt to link anything because archive_cmds in the
    F77 section is not defined. If I simply copy in the definition from
    the top section a command is issued using g77 as the linker. It looks
    like a simple oversight in the port of libtool to f77. Is that
    something that was done by us? Of course, why does this work
    on linux? Does libtool inherit settings from the default configuration
    if the tag sets the value to the empty string? [or is it meant to?]
     F77 defines a .a section explicitly.

     Unfortunately, using the g77 as the linker generates an error
     because of the link to libg2c.a (which is static and furthermore
     will be linked to by the executable later):


/usr/bin/libtool: internal link edit command failed
ld: common symbols not allowed with MH_DYLIB output format with the
-multi_module option
/sw/lib/gcc/powerpc-apple-darwin7.4.0/3.4.0/../../../libg2c.a(err.o)
definition of common _f__cblank (size 4)
/sw/lib/gcc/powerpc-apple-darwin7.4.0/3.4.0/../../../libg2c.a(fmt.o)
definition of common _f__cnt (size 40)
/sw/lib/gcc/powerpc-apple-darwin7.4.0/3.4.0/../../../libg2c.a(fmt.o)
definition of common _f(char,  *) (size 4)

<snip>

Forcing a -Wl,-single_module to libtool does fix things but I have no real
idea what effect that will have downstream when I try to link two shared
libraries that are both statically including a single_module libg2c.a.

I'm going to proceed with caution on this, hard-coding the use of gcc as
the linker and see how I get on. I'll report on this later. Comments from
Norman appreciated :-)

--
Tim Jenness
JAC software
http://www.jach.hawaii.edu/~timj

Top of Message | Previous Page | Permalink

JISCMail Tools


RSS Feeds and Sharing


Advanced Options


Archives

April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
2004
April 2003
2003


WWW.JISCMAIL.AC.UK

Secured by F-Secure Anti-Virus CataList Email List Search Powered by the LISTSERV Email List Manager