Arch Linux

Lone_Wolf

Forum Moderator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,922

Re: GCC 5 is coming with a massive rebuild

chaonaut, then they may have been created by a .install file .

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)

chaonaut

Member

From: Kyiv, Ukraine

Registered: 2014-02-05

Posts: 382

Re: GCC 5 is coming with a massive rebuild

anyway, they're in place now, and gcc5 can build with LTO yet more packages (in my system) than gcc-4.9.

---

— love is the law, love under wheel, — said aleister crowley and typed in his terminal:
usermod -a -G wheel love

AnAkkk

Member

Registered: 2014-03-03

Posts: 148

Re: GCC 5 is coming with a massive rebuild

--with-default-libstdcxx-abi=c++98  will be dropped in a couple of weeks (assuming no big issues with the compiler are found) and then we will do a rebuild.

Is the change to the new ABI still planned?

Lone_Wolf

Forum Moderator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,922

Re: GCC 5 is coming with a massive rebuild

https://lists.archlinux.org/pipermail/a … 27202.html

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)

AnAkkk

Member

Registered: 2014-03-03

Posts: 148

Re: GCC 5 is coming with a massive rebuild

https://lists.archlinux.org/pipermail/a … 27202.html

Thanks for the link !

WorMzy

Forum Moderator

From: Scotland

Registered: 2010-06-16

Posts: 11,864

Website

Re: GCC 5 is coming with a massive rebuild

See also: http://allanmcrae.com/2015/06/the-case- … wo-c-abis/

---

Sakura:-
Mobo: MSI MAG X570S TORPEDO MAX // Processor: AMD Ryzen 9 5950X @4.9GHz // GFX: AMD Radeon RX 5700 XT // RAM: 32GB (4x 8GB) Corsair DDR4 (@ 3000MHz) // Storage: 1x 3TB HDD, 6x 1TB SSD, 2x 120GB SSD, 1x 275GB M2 SSD

Making lemonade from lemons since 2015.

AnAkkk

Member

Registered: 2014-03-03

Posts: 148

Re: GCC 5 is coming with a massive rebuild

See also: http://allanmcrae.com/2015/06/the-case- … wo-c-abis/

Fedora and Ubuntu seem to go with the new ABI too though, are they not affected by this issue?

Allan

Pacman

From: Brisbane, AU

Registered: 2007-06-09

Posts: 11,392

Website

Re: GCC 5 is coming with a massive rebuild

See also: http://allanmcrae.com/2015/06/the-case- … wo-c-abis/

Fedora and Ubuntu seem to go with the new ABI too though, are they not affected by this issue?

Yes they are.   Note neither of them are actually using hte new ABI yet.

---

PGP Key: F99FFE0FEAE999BD

hoschi

Member

From: Ulm (Germany)

Registered: 2008-11-03

Posts: 458

Re: GCC 5 is coming with a massive rebuild

We are now switching the ABI. So we won't wast any more time on waiting for LLVM?
https://llvm.org/bugs/show_bug.cgi?id=23529

Allan

Pacman

From: Brisbane, AU

Registered: 2007-06-09

Posts: 11,392

Website

Re: GCC 5 is coming with a massive rebuild

It is patched in our repos - same as Fedora.

---

PGP Key: F99FFE0FEAE999BD

hoschi

Member

From: Ulm (Germany)

Registered: 2008-11-03

Posts: 458

Re: GCC 5 is coming with a massive rebuild

Thanks! I'm glad to see it

Our little poor patch policy *patpatpat*
The patch is hosted on (review).llvm.org

Last edited by hoschi (2015-12-10 12:21:19)

headkase

Member

Registered: 2011-12-06

Posts: 1,977

Re: GCC 5 is coming with a massive rebuild

Well, it only took ten months to happen.  As the original poster I honestly thought it would've happened sooner.

Allan

Pacman

From: Brisbane, AU

Registered: 2007-06-09

Posts: 11,392

Website

Re: GCC 5 is coming with a massive rebuild

Well, it only took ten months to happen.  As the original poster I honestly thought it would've happened sooner.

LLVM/clang++ still is not patched to work with the new ABI upstream.   We have pulled a patch from their review tracker (which is also used by Fedora 23), but I see reports it still is not actually fully fixed...

---

PGP Key: F99FFE0FEAE999BD

snack

Member

From: Italy

Registered: 2009-01-13

Posts: 861

Re: GCC 5 is coming with a massive rebuild

This morning I updated my system with the rebuilt packages. I was about to rebuild all my stuff (not Arch packages but just my local C++ projects) when I decided to give them a try before rebuilding everything. To my surprise, all the executables and libraries built with gcc 5.2 are still working. I tested just a few of them but none have crashed or misbehaved up to now. So I'm confused since as far as I understood binaries compiled against the old ABI should crash when using the new libstdc++. Since Arch rebuilt everything I thought it was necessary also for me to rebuild all my software otherwise it would crash, but it seems it's not the case (at least not always) so I'm undecided about rebuilding all my stuff or not. Can anyone please shed some light on this situation? Thanks.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,738

Re: GCC 5 is coming with a massive rebuild

If your projects don't link to any other (rebuilt) libraries they should continue to work, since libstdc++ itself contains both ABIs. Only if you use other libraries and they are linked against the new ABI you might run into symbol lookup errors

Last edited by V1del (2015-12-11 09:29:43)

snack

Member

From: Italy

Registered: 2009-01-13

Posts: 861

Re: GCC 5 is coming with a massive rebuild

@V1del: some executables of mine link libQtGui and other Qt libraries and they don't crash. But I'd guess they should given your words; am I correct?

Allan

Pacman

From: Brisbane, AU

Registered: 2007-06-09

Posts: 11,392

Website

Re: GCC 5 is coming with a massive rebuild

It depends which parts of C++ use use - many are the same across the two ABIs.

---

PGP Key: F99FFE0FEAE999BD

snack

Member

From: Italy

Registered: 2009-01-13

Posts: 861

Re: GCC 5 is coming with a massive rebuild

@Allan: thanks for the clarification. I started a full rebuild anyway since I got compiler errors related to the new ABI when compiling my code this morning after some modifications.