Problems with generating kde2 dlls under cygwin

Problems with generating kde2 dlls under cygwin

[Ralf Habacker]

Hi all,
on compiling kde 2 for cygwin I have problems with the ld -whole-archive
option. Perhaps someone can help me.

The ld manual tells the following about the --whole-archive option:

"For each archive mentioned on the command line after the --whole-archive
option, include every object file in the archive in the link, rather than
searching the archive for the required object files. This is normally used
to turn an archive file into a shared library, forcing every object to be
included in the resulting shared library. This option may be used more than
once.""

This works good in the following manner:

g++ -shared <flags> -Wl,--whole-archive <objs> -Wl,-no-whole-archive
<deplibs>

and if <deplib> are import libs of other shared libraries.
If <deplib> contains a static lib, the used symbols of this lib are always
exported. Can anyone tell, whats goeing wrong and how I could supress this ?

Thank you for any help

Regard
Ralf Habacker


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Re: Problems with generating kde2 dlls under cygwin

[Alan Modra]

On Sat, Jul 21, 2001 at 11:32:36AM +0200, Ralf Habacker wrote:
> g++ -shared <flags> -Wl,--whole-archive <objs> -Wl,-no-whole-archive
> <deplibs>
> 
> and if <deplib> are import libs of other shared libraries.
> If <deplib> contains a static lib, the used symbols of this lib are always
> exported.

Why do you think they should not be exported?  A static lib is just an
archive of object files.  When object files are retrieved from a static
lib to satisfy undefined syms, they are treated the same as if you had
specified the individual object files on the command line.

Alan


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AW: Problems with generating kde2 dlls under cygwin

[Ralf Habacker]

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> -----Ursprüngliche Nachricht-----
> Von: cygwin-owner@sources.redhat.com
> [ mailto:cygwin-owner@sources.redhat.com]Im Auftrag von Alan Modra
> Gesendet am: Samstag, 21. Juli 2001 11:49
> An: Ralf Habacker
> Cc: Binutils; Cygwin
> Betreff: Re: Problems with generating kde2 dlls under cygwin
>
> On Sat, Jul 21, 2001 at 11:32:36AM +0200, Ralf Habacker wrote:
> > g++ -shared <flags> -Wl,--whole-archive <objs> -Wl,-no-whole-archive
> > <deplibs>
> >
> > and if <deplib> are import libs of other shared libraries.
> > If <deplib> contains a static lib, the used symbols of this lib
> are always
> > exported.
>
> Why do you think they should not be exported?  A static lib is just an
> archive of object files.  When object files are retrieved from a static
> lib to satisfy undefined syms, they are treated the same as if you had
> specified the individual object files on the command line.
>
Thats right, but the problem is, if you add a static lib to resolve symbol
in
two dlls for example a.dll and b.dll and a.dll contains symbols needed by
b.dll,
linking of b.dll will fail because of duplicate symbols error.

> Alan
>
>
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>


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