installation of glibc crashes because of ABI sonames

[Florian Weimer]

* Adhemerval Zanella Netto:

> On 26/09/22 09:53, Patrick Rother wrote:
>> Hello.
>> 
>> On Mon, Sep 26, 2022 at 01:35:46PM +0200, Florian Weimer wrote:
>>>> So, before the quoted change is was possible to upgrade glibc from
>>>> source on a running system, but as of 2.34 this is no longer
>>>> possible.
>>>
>>> In my experience, it has always been required to use “make install
>>> DESTDIR=…” to update a running system, and then move the resulting
>>> temporary tree into place with a single command.  (The elimination of
>>> symbolic links actually makes this step more reliable because there
>>> are no older glibc .so files left behind.)  It never occurred to me
>>> that we regressed this functionality because it didn't actually work
>>> before for me.
>> 
>> I wasn't aware of the DESTDIR=… option, and interestingly that worked
>> like a charm.
>> 
>> Problem solved for me, thank you!
>> 
>
> It is described on INSTALL file:
>
> 408 Installing the C Library
> 409 ========================
> 410
> [...]
> 437    You can install the GNU C Library somewhere other than where you
> 438 configured it to go by setting the 'DESTDIR' GNU standard make variable
> 439 on the command line for 'make install'.  The value of this variable is
> 440 prepended to all the paths for installation.  This is useful when
> 441 setting up a chroot environment or preparing a binary distribution.  The
> 442 directory should be specified with an absolute file name.  Installing
> 443 with the 'prefix' and 'exec_prefix' GNU standard make variables set is
> 444 not supported.

We should probably error out in “make install” if DESTDIR is not set.