Re: F29 System Wide Change: OpenLDAP without Non-threaded Libraries

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* Florian Weimer:

> On 07/17/2018 04:08 PM, Kamil Dudka wrote:
>> On Tuesday, July 17, 2018 2:24:04 PM CEST Matus Honek wrote:
>>> Florian is right, the idea is to make changes to the source code
>>> (probably a downstream patch will be needed) such that the threaded
>>> library will be built twice, once with libldap soname and once with
>>> libldap_r soname, and the non-threaded libldap won't be shipped at
>>> all.
>>>
>>> The non-threaded version basically provides a subset of capabilities of
>>> the threaded version, which are additionally thread safe
>>> (i.e. mutexes). There shouldn't be really any noticeable change.
>>>
>>> Does this make sense?
>>
>> So can it happen that both the libraries will be loaded at the same time
>> by a single process (one of them for example through libcurl)?
>>
>> Will everything work as expected in this case?
>
> It's certainly quite risky, and many things can go wrong (dlopen of
> the dormant copy of the library, ELF constructors running twice).
>
> Matus, have you considered turning libldap.so into a linker script
> (referencing libdap_r.so) and libldap-2.4.so.2 into a stub which only
> depends on libldap_r-2.4.so.2?  The dynamic linker will then search
> libldap_r if the application links against libldap.

FYI, I have a downstream patch for this which is undergoing review.

Thanks,
Florian
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