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Re: [Qemu-devel] [PATCH v10 5/8] module: implement module loading

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v10 5/8] module: implement module loading
Date: Wed, 18 Sep 2013 13:45:10 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8

Il 17/09/2013 07:40, Richard Henderson ha scritto:
> On 09/16/2013 06:29 PM, Fam Zheng wrote:
>>> Link spice-qemu.char.so against spice-core.so.  The DT_NEEDED entry will be
>>> recorded, and ld.so will do the right thing.
>>> Anything else sounds way too much like Not Invented Here.
>> How to do the symbol checking as above if spice-core.so is automatically 
>> loaded
>> by ld.so?
> You're checking the version stamp in spice-char.so.  I'd think that's good
> enough.  No need to transitively check.
>> And we will need to add $moddir to LD_LIBRARY_PATH and lose the restriction 
>> of
>> modules directory too.
> Or add DT_RUN_PATH to the main executable, or even add DT_RUN_PATH to the
> module itself.  In particular, link the module with
>   -Wl,--enable-new-dtags -Wl,-rpath,'$ORIGIN'
> and dependencies for the module will automatically be looked for in the
> directory in which the module is found.  Which is almost certiainly the only
> thing that we want -- all modules in the same directory.

This is not portable.

It looks like it can be emulated on Windows using LoadLibraryEx with the
LOAD_WITH_ALTERED_SEARCH_PATH flag and passing an absolute path to the
shared library.

But on Mac OS X a bundle (module loaded with dlopen) cannot have a
dependency on another bundle, afaik.


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