Re: MPE Port - Jeffrey A Law

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From: Jeffrey A Law <law@cygnus.com>
To: Mark Klein <mklein@dis.com>
Cc: gcc@gcc.gnu.org
Subject: Re: MPE Port
Date: Mon, 08 Nov 1999 19:54:00 -0000	[thread overview]
Message-ID: <2799.942119599@upchuck> (raw)
In-Reply-To: <4.2.0.58.19991108193122.00c7c220@garfield.dis.com>

  In message < 4.2.0.58.19991108193122.00c7c220@garfield.dis.com >you write:
  > At 03:38 AM 9/13/99 -0600, Jeffrey A Law wrote:
  > 
  > >collect is supposed to look at all the files on the link line for construc
  > tors
  > >and add them to th ctor/dtor list.
  > 
  > Why does collect explicitly not add symbols from a shared library to the
  > constructor/destructor list? How would those constructors/destructors
  > ever get run on another platform if they were in a shared library or is
  > there another mechanism in that case?
Because if someone replaced the library, then all the applications linked
against the library would have to be re-linked just in case the list of
ctors/dtors changed.

So instead collect builds and exports a single constructor function for the
entire library.  *that* function should be added to he ctor/dtor list for
the main program.

That way the shared library can be updated and programs linked against the
library do not need to be relinked if the library's initialization requirements
changed.


jeff

WARNING: multiple messages have this Message-ID

From: Jeffrey A Law <law@cygnus.com>
To: Mark Klein <mklein@dis.com>
Cc: gcc@gcc.gnu.org
Subject: Re: MPE Port
Date: Tue, 30 Nov 1999 23:37:00 -0000	[thread overview]
Message-ID: <2799.942119599@upchuck> (raw)
Message-ID: <19991130233700.h5K2UdlHhnV-dzncRcjcFZTZfYGM1CZyH9PXPEUpjeU@z> (raw)
In-Reply-To: <4.2.0.58.19991108193122.00c7c220@garfield.dis.com>

  In message < 4.2.0.58.19991108193122.00c7c220@garfield.dis.com >you write:
  > At 03:38 AM 9/13/99 -0600, Jeffrey A Law wrote:
  > 
  > >collect is supposed to look at all the files on the link line for construc
  > tors
  > >and add them to th ctor/dtor list.
  > 
  > Why does collect explicitly not add symbols from a shared library to the
  > constructor/destructor list? How would those constructors/destructors
  > ever get run on another platform if they were in a shared library or is
  > there another mechanism in that case?
Because if someone replaced the library, then all the applications linked
against the library would have to be re-linked just in case the list of
ctors/dtors changed.

So instead collect builds and exports a single constructor function for the
entire library.  *that* function should be added to he ctor/dtor list for
the main program.

That way the shared library can be updated and programs linked against the
library do not need to be relinked if the library's initialization requirements
changed.


jeff

next prev parent reply	other threads:[~1999-11-08 19:54 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1999-09-06 10:40 Mark Klein
1999-09-07  2:38 ` Jeffrey A Law
1999-09-07  6:39   ` Mark Klein
1999-09-08  0:45     ` Jeffrey A Law
1999-09-08 20:04       ` Mark Klein
1999-09-15  2:47         ` Jeffrey A Law
1999-09-15  8:32           ` Mark Klein
1999-09-30 18:02             ` Mark Klein
1999-09-30 18:02           ` Jeffrey A Law
1999-10-09 20:18           ` Mark Klein
1999-10-14  4:03             ` Jeffrey A Law
1999-10-14  7:20               ` Mark Klein
1999-10-14 10:45                 ` Jeffrey A Law
1999-10-14 11:05                   ` Mark Klein
1999-10-31 23:35                     ` Mark Klein
1999-10-31 23:35                   ` Jeffrey A Law
1999-10-31 23:35                 ` Mark Klein
1999-10-31 23:35               ` Jeffrey A Law
1999-10-31 23:35             ` Mark Klein
1999-11-08 19:34           ` Mark Klein
1999-11-08 19:54             ` Jeffrey A Law [this message]
1999-11-09  6:52               ` Mark Klein
1999-11-30 23:37                 ` Mark Klein
1999-11-10  7:48               ` MPE Port and collect Mark Klein
1999-11-30 23:37                 ` Mark Klein
1999-11-30 23:37               ` MPE Port Jeffrey A Law
1999-11-30 23:37             ` Mark Klein
1999-09-30 18:02         ` Mark Klein
1999-09-30 18:02       ` Jeffrey A Law
1999-09-30 18:02     ` Mark Klein
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
  -- strict thread matches above, loose matches on Subject: below --
1999-09-07  8:42 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-10-25 22:41 ` Jeffrey A Law
1999-10-26  7:03   ` Mark Klein
1999-10-26 19:12     ` Jeffrey A Law
1999-10-26 19:52       ` Mark Klein
1999-10-31 23:35         ` Mark Klein
1999-10-31 23:35       ` Jeffrey A Law
1999-10-31 23:35     ` Mark Klein
1999-10-31 23:35   ` Jeffrey A Law
1999-09-06 10:40 Mark Klein
1999-09-08  1:39 ` Jeffrey A Law
1999-09-08  6:35   ` Mark Klein
1999-09-15  2:52     ` Jeffrey A Law
1999-09-15  8:26       ` Mark Klein
1999-09-30 18:02         ` Mark Klein
1999-09-30 18:02       ` Jeffrey A Law
1999-09-30 18:02     ` Mark Klein
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-08  1:41 ` Jeffrey A Law
1999-09-08  6:37   ` Mark Klein
1999-09-30 18:02     ` Mark Klein
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-08  1:49 ` Jeffrey A Law
1999-09-08 20:31   ` Mark Klein
1999-09-30 18:02     ` Mark Klein
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-08  1:40 ` Jeffrey A Law
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-10-25 22:32 ` Jeffrey A Law
1999-10-26  6:51   ` Mark Klein
1999-10-26 19:05     ` Jeffrey A Law
1999-10-26 19:21       ` Mark Klein
1999-10-31 23:35         ` Mark Klein
1999-10-31 23:35       ` Jeffrey A Law
1999-10-31 23:35     ` Mark Klein
1999-10-31 23:35   ` Jeffrey A Law
1999-09-06 10:40 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:40 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:39 Mark Klein
1999-09-07  3:20 ` Jeffrey A Law
1999-09-07  6:46   ` Mark Klein
1999-09-08  0:43     ` Jeffrey A Law
1999-09-30 18:02       ` Jeffrey A Law
1999-09-30 18:02     ` Mark Klein
1999-09-30 18:02   ` Jeffrey A Law
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:39 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-09-06 10:39 Mark Klein
1999-09-30 18:02 ` Mark Klein
1999-08-27 17:20 HARD_REGNO_MODE_OK on PA-RISC (revisited) Mark Klein
1999-08-29  3:19 ` Jeffrey A Law
1999-09-06 10:39   ` MPE Port Mark Klein
1999-09-30 18:02     ` Mark Klein

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