Function-Level Linking
Lance Lovette -- lovette@iftech.com
Tuesday, July 30, 1996
Environment: [MSVC 4.2, NT 3.51 SP4 ]
What controls whether the function-level linking option (/Gy) is enabled =
or
disabled in the Project Settings dialog? It seems to be enabled for Debug=
builds and disabled for Release builds. Why does the IDE not want you to
have a release build with function-level linking? I have noticed that
changing the optimizations to something other than Maximize Speed will en=
able
it.
Thanks,
Lance
lovette@iftech.com
+------------------------------------------------------------------------=
-----+
Interface Technologies, Inc.
For a collection of free tutorials covering a variety of programming and
computer-related topics such as Visual C++, MFC, and Windows NT check out=
the ITI On-line Training Center at http://www.iftech.com.
Ken Mayger -- kmayger@atlcom.net
Sunday, August 04, 1996
Lance,
Function level linking was originally created to make smaller EXEs. It's
like the idea of a library tha is linked into a program, only the objs that
are called are actually included in the EXE. Function level linking in
essence turns OBJs into small libraries and each function is only linked in
if it is called. This was a bigger deal back in the DOS days when the
EXE's footprint meant more. By default, I believe the linker will remove
any unreferenced packaged functions (/PACKFUNCTIONS). Add a NO to the same
flag and it will link in any OBJ you through at it regardless of if the
code inside is ever called. As to why the speed optimizations are turning
it off is anyone's guess. Hope this helps.
Later,
Ken
----------
From: Lance Lovette[SMTP:Lovette@iftech.com]
Sent: Tuesday, July 30, 1996 5:13 PM
To: 'mfc-l'
Subject: Function-Level Linking
Environment: [MSVC 4.2, NT 3.51 SP4 ]
What controls whether the function-level linking option (/Gy) is enabled =
or
disabled in the Project Settings dialog? It seems to be enabled for Debug=
builds and disabled for Release builds. Why does the IDE not want you to
have a release build with function-level linking? I have noticed that
changing the optimizations to something other than Maximize Speed will en=
able
it.
Thanks,
Lance
lovette@iftech.com
+------------------------------------------------------------------------=
-----+
Interface Technologies, Inc.
For a collection of free tutorials covering a variety of programming and
computer-related topics such as Visual C++, MFC, and Windows NT check out=
the ITI On-line Training Center at http://www.iftech.com.
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end
Mike Blaszczak -- mikeblas@nwlink.com
Wednesday, August 07, 1996
[Mini-digest: 2 responses]
At 11:19 PM 8/4/96 -0400, you wrote:
>By default, I believe the linker will remove
>any unreferenced packaged functions (/PACKFUNCTIONS).
The 4.2 Linker, which Lance said he was using, has no such option.
I think that this option was only on the 16-bit linkers.
.B ekiM
http://www.nwlink.com/~mikeblas/
These words are my own. I do not speak on behalf of Microsoft.
-----From: Dan Kirby
/O1 and /O2 options encapsulate /Gy. When these options are set, you can
not turn off the /Gy and therefore this option is disables with the
smallest code or fastest code optimizations.
--dan
Bok Nan Lo -- lo@ia-us.com
Monday, August 12, 1996
On Wednesday, August 07, 1996 11:35 PM, Mike
Blaszczak[SMTP:mikeblas@nwlink.com] wrote:
> [Mini-digest: 2 responses]
>
> At 11:19 PM 8/4/96 -0400, you wrote:
> >By default, I believe the linker will remove
> >any unreferenced packaged functions (/PACKFUNCTIONS).
>
> The 4.2 Linker, which Lance said he was using, has no such option.
> I think that this option was only on the 16-bit linkers.
>
> .B ekiM
> http://www.nwlink.com/~mikeblas/
> These words are my own. I do not speak on behalf of Microsoft.
>
> -----From: Dan Kirby
>
> /O1 and /O2 options encapsulate /Gy. When these options are set, you can
> not turn off the /Gy and therefore this option is disables with the
> smallest code or fastest code optimizations.
> --dan
>
>
Function level linking is available in VC 4.2:
Project Settings, C/C++, Customize -- Enable function-level linking
The checkbox is grayed out most of the time, but if you attempt to build a
DLL with linking to some static libraries, the option will magically
appear. I've only seen this option turned up once while messing around with
a static linking of MFC libraries (mfco42.dll) into my OCX by re-compiling
the library in hope that I can get rid of MFC runtime DLLs (of course I did
not get it to work).
As a side, I spent only an hour messing around with static linking of an
OCX to MFC static libraries, and this time it has only produced 2 errors,
compared to hundreds in previous version (v4.0). Perhaps the MFC team is
working very hard to enable static linking of MFC libraries to an OCX due
to the pressure from the ActiveX Internet Control to create a smaller sized
(I mean we do not need MFC4x.DLL) OCX?
--
Bok Nan Lo
IA Corporation
Phone: 510-4506871 Fax: 510-4507099
E-Mail: lo@ia-us.com
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