Re: -z defs linker flag activated in Fedora rawhide

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On Thu, Jan 25, 2018 at 4:13 AM, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
> On Thu, Jan 25, 2018 at 09:03:34AM +0000, Tom Hughes wrote:
>> On 25/01/18 08:41, Richard W.M. Jones wrote:
>> >On Thu, Jan 25, 2018 at 08:31:29AM +0100, Remi Collet wrote:
>> >>Le 22/01/2018 à 16:24, Florian Weimer a écrit :
>> >>>I updated redhat-rpm-config to instruct ld to reject linking shared
>> >>>objects with undefined symbols.  Such undefined symbols break symbol
>> >>>versioning because the are not necessarily bound to the correct symbol
>> >>>version at run time.  (rhbz#1535422)
>> >>
>> >>So this break all the PHP stack build...
>> >>
>> >>(all php extensions are dl open plugins, relying on symbol from the engine)
>> >
>> >I think the -z defs change should be reverted.  It breaks very long-
>> >standing expected behaviour of linkers and there's been no proper
>> >justification for doing it.
>>
>> Other than detecting cases where shared libraries were missing
>> NEEDED entries for other shared objects that they use?
>
> I can't remember now what it's called but there's another way to do
> that which all other distros except Fedora use.
>

-Wl,--as-needed and -Wl,--no-undefined

c.f.: http://gitweb.mageia.org/software/rpm/rpm-setup/tree/build.macros.in#n221

openSUSE uses the same approach, but apparently the file doesn't
render on their VCS due to not being UTF-8. :/



-- 
真実はいつも一つ!/ Always, there's only one truth!
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