gcc7/libgcc7 problems

Ruben Di Battista rubendibattista at gmail.com
Sun Dec 15 20:13:42 UTC 2019

Isn't something similar to what patchelf does possible on macOs? Editing
the RPATH?

On Sun, 15 Dec 2019, 19:06 Ken Cunningham, <ken.cunningham.webuse at gmail.com>

> This issue is a classic c++ standard lib mixup, exactly what we have
> always feared and tried our best to avoid on MacPorts.
> Objects are being created using /usr/lib/libstdc++.dylib and then (in
> this case) attempt to be deleted by /opt/local/lib/libstdc++.dylib and
> they are not matching up, so errors are happening.
> We've discussed this exact situation for years, but until now, it has not
> happened.
> Solutions are tricky. Upstream is trying to see if they can tweak libgcc7
> 7.5.0 to not error out, like libgcc7 7.4.x did not error out. Maybe that
> might work. Dunno.
> We can set the DYLD_LIBRARY_PATH to point to /opt/local/lib/libgcc/ and
> so software will look there first. That works. Getting it to always apply
> to all software is a bit tricky...
> You can set up a chroot environment, and run your software there -- good
> luck -- if you know how to do that, you're probably not trying to run
> libgcc7 on a 15 year old PowerMac.
> Or -- get ready for it -- we can update the libgcc in /usr/lib to a
> current one, like the one from libgcc7 with some kind of installer that
> we supply (and maintain, and and and). I can hear the groans now.
> We could, perhaps, get libc++ working on PowerMac, and use that -- it
> would, naturally, have no such interaction with /usr/lib/libstdc++.dylib and
> therefore problem solved.
> So -- working on it. For now, libgcc7 7.4.x is magically immune, it
> appears, at least so far as we know, for now.
> K
> On Dec 11, 2019, at 12:58, Ken Cunningham <ken.cunningham.webuse at gmail.com>
> wrote:
> Iain has asked for a minimal reproducer and a bisected commit that
> generated the error. Then it's worth opening the bug report.
> I tried a few different iostream with locale test files, but so far
> couldn't repro the error.
> Best,
> Ken
> On Wed, Dec 11, 2019 at 12:11 PM Eric Gallager <egall at gwmail.gwu.edu>
> wrote:
>> On 12/11/19, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
>> > We're having troubles with the recent gcc7 upgrade to 7.5.0 on i386
>> > (bootstrapping with non-system assembler) and on 10.5 PPC (bus errors in
>> > memory handling, possibly related to locale support, maybe some other
>> thing
>> > TBA).
>> >
>> > We may have to bump epoch and roll back to last 7.4.x unless we can get
>> > this sorted out soon, as tickets are starting up...
>> >
>> > Ken
>> >
>> Is there an upstream bug filed in the GCC Bugzilla about this? I
>> realize the branch for 7 is closed now, but it could be due to a
>> change backported from a different branch where it's also relevant...
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