Re: Linux-flashplugin7 & rtld - RFC

Quoting Norikatsu Shigemura <nork_at_freebsd.org> (from Wed, 21 Jun 2006  
19:25:01 +0900 (JST)):

>> Quoting Norikatsu Shigemura <nork_at_freebsd.org> (from Wed, 21 Jun 2006
>> 15:36:19 +0900 (JST)):
>>>> Nork-san says that it is hard to make LPW work on 7-CURRENT.  But, he
>>>> is trying to make it work with another approach.
>>> Yes, I'm working Userland COMPAT_LINUX technology[TM]:-).
>> Can you be a little bit more verbose what this is? Just a high level
>> overview. I'm curious since I have some ideas about some kind of
>> cross-compatibility "something" too (a combination of objcopy, a
>> liblinux2bsd and maybe some libmap stuff).
>
> I'm implementing like following codes to libc/libm/libpthread
> on 7-current with SYMVER_ENABLED=yes.

[example]

Ugh... I like parts of this (it's the same I thought about myself),  
but parts of this are... not optimal in my opinion.

I don't like to spam our libXXX to contain GLIBC symbols. First I  
feared that this could lead to unexpected side effects in problem  
cases with linux programs which pick up native libs (e.g. when you  
have LD_LIBRARY_PATH set to a directory with native libs and you try  
to start a linux program after updating to the new default linux base  
port). But I don't think this is the case (we get an error about an  
incorrect ELF ABI). So ATM the only bad feeling I have about this is  
the "spamming".

Did you tried to put this into a liblinux2bsd? The idea I had was to  
try if such a lib can be "attached" to e.g. linux flashplugin. Either  
with some objcopy (or similar) stuff, by trying to link again (with  
liblinux2bsd), or with libmap.conf. Another nice try is to have a  
program/script which does some known obj* stuff with object files,  
libs and/or programs. The examples I wanted to look at with this stuff  
are your linuxpluginwrapper, the linuxthreads port, my icc port and  
maybe the ifc port (it's basically an adoption of my icc port, but  
AFAIR there are some enhancements). All of them contain already some  
kind of mappings between linux and bsd. And maybe a combination of  
both ways (liblinux2bsd and a script which does obj* stuff) could lead  
to a successfull assimilation of some linux-only stuff.

What do you think, does this sound like something which could be an  
improvement to your current work?

Bye,
Alexander.

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