Re: Re[2]: [Mingw-users] Dll Loading

[Luke D. <cod...@ho...>]

>From: RomikB <ro...@ma...>
>Reply-To: RomikB <ro...@ma...>
>To: min...@li...
>Subject: Re[2]: [Mingw-users] Dll Loading
>Date: Fri, 20 Jun 2003 15:21:51 +0300
>
>Hello Luke,
>
>Friday, June 20, 2003, 1:02:46 PM, you wrote:
>
>LD> First please see this page about what information you need to include 
>when
>LD> reporting a problem: http://www.mingw.org/bugs.shtml
>LD> I can't reproduce this with a trivial example so you'll need to provide 
>a
>LD> small test case, and you can try comparing the DLLs yourself to find 
>out
>LD> what is changing with "-s", for example with this command:
>LD> objdump -p file.dll
>
>In gcc manual(linker options):
>-s
>Remove all symbol table and relocation information from the executable.
>
>In ld manual:
>-s, -strip-all
>Omit all symbol information from the output file.
>
>So when i using -s I lost relocation information, but .reloc section
>still exist, and dll's that have the same or crossing base addreses
>can't be loaded succesfuly.

I've read a lot of replies to your problem that don't make a lot of sense to 
me, so I'll just try to explain what I think:

1. When I create a trivial test DLL, using "-s" or "-Wl,-s" or "strip" on it 
does NOT remove base relocations. The fact that the .reloc section exists 
and that "objdump -p" lists the base relocations shows that this is the 
case. This is why I asked for a test case, because we can't reproduce your 
problem otherwise.

2. The question of whether it is safe to remove relocations from executables 
(.exe) is meaningless because executables don't have relocations! :-). They 
are loaded at their default base address and have no .reloc section.

3. If it can be shown that either 1 or 2 above are not true then it is a 
bug. It should always be safe to strip a DLL, and the documentation above 
about removing relocation information should not apply to DLL base 
relocations.

Luke


>
>GCC 3.2.3
>MinGW 2.0.0-3
>GNU ld version 2.13.90 20030104
>
> >> I create a set of dll's.
> >> I use:
> >> gcc -O2 -shared -Wl,-s -o file.dll file.c
> >> But when i try load them, I get an error: not all dll's can be loaded.
> >> When I remove -Wl,-s switch a problem disapear, but dll's now it TOOO
> >> BIG.
> >> Please answer how can I reduse the size of dll.
> >> (I don't need debug or symbol info. Need only relocation info.)
>
>--
>Best regards,
>  RomikB                            mailto:ro...@ma...

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