My experience: gcc-5 usable by now

mv · Watchman Joined: 20 Apr 2005 Posts: 6747

Just for completeness: This is the list of trivial patches which seems to be currently still needed for gcc-5

yagami · Posted: Tue Aug 04, 2015 9:19 am Post subject:

I have been using gcc-5 since 5.1 was released with great success.

Some patches are needed, mainly because of configure woes with version numbering.

I was able to use skype with gcc 5.1 by compiling qtwebkit with clang.

Strangelly, as soon as gcc 5.2 was out i tested recompiling qtwebkit with it and using skype, but it still failed! Is there any other package needed to recompile ?

mv · Watchman Joined: 20 Apr 2005 Posts: 6747

jean-michel.smith · n00b Joined: 04 Oct 2014 Posts: 5

As a followup, libreoffice compiles

What I determined was that an "emerge -Deuv @world" was not enough to ensure everything was recompiled with gcc 5.2,0. Some obscure dependencies were missed, even though libreoffice itself was in @world (though I removed it later to ensure a complete, successful emerge -Deuv @world. It still was not enough).

emerge -Deuv libreoffice was also insufficient.

What worked was the following:

gienah · Developer Joined: 24 Nov 2010 Posts: 212 Location: AU

I hacked up this script, its untested. It tries to implement the idea that to
upgrade the system to be compiled with >=sys-devel/gcc-5.2.0 then its
seems best to first try compiling all the libraries. Some of the compiles may fail
due to their dependencies being built with an old compiler, so its likely necessary
to run it repetitively. Then after the libraries are rebuilt, the script could be edited
to try rebuilding the binaries.
However there may be other files in other directories that need rebuilding, so this
is likely incomplete. So just offering this free untested hack, with absolutely no warranty,
use at your own risk, ...

schorsch_76 · Guru Joined: 19 Jun 2012 Posts: 450

@gienah: I can confirm, that the change to gcc-5 needs multiple rebuilds. I rebuild 2 of my 4 machines with gcc 5.2. I rebuild whole world 3 times with gcc-5.2. Some packages needed a pactch (preprocessor thing). But most of my installed 700 packages are stable. Even my kernel is on gcc-5.2. The most bumpy ride was the initial jump to gcc-5 (3 times world).

mv · Watchman Joined: 20 Apr 2005 Posts: 6747

It seems that on 64-bit systems wine is currently a show-stopper: It used to compile, but on 64 bit it is reported to break. The new ebuilds have a check and refuse to compile. But even if I copied them in my local overlay and removed the check, I was not able to compile wine now with gcc-5.2 (although with the same CFLAGS, the same version was once compiled successfully with gcc-5.1). I had no time yet to check whether this is related with the gcc-5.1 -> gcc-5.2 bump or with a bump of some other library. I guess that it is the latter.
Edit: Compilation of wine fails currently also on 32 bit systems...

Yamakuzure · Posted: Tue Sep 01, 2015 10:13 am Post subject:

schorsch_76 · Guru Joined: 19 Jun 2012 Posts: 450

On a new stage3 i only needed to ~arch

Roman_Gruber · Posted: Wed Sep 02, 2015 8:17 pm Post subject:

ksh does not build with gcc 5.2 and gold linker and the ordinary linker.

---

second package that fails here

awalp · n00b Joined: 29 May 2003 Posts: 73

I'm running a system completely built using gcc 5.
Complete desktop system on kde-plasma 5 / kde-next-live

I have been releasing stage3 files I built with GCC 5.2 for march sandybridge and haswell at
http://gentoo.awalp.net

I only had to change a couple packages to ~amd64, like xorg-server.

I haven't run into a single package that wouldn't merge (just a couple that needed ~amd64 / newer versions).

-------------

Also in case you didn't know, the CFLAGS="-march" had changes since GCC 4.9.

With GCC 5.2, for example corei7-avx changes to sandybridge
for example, core-avx2 changes to haswell

Yamakuzure · Posted: Thu Sep 03, 2015 5:45 am Post subject:

Yamakuzure · Posted: Thu Sep 03, 2015 9:06 am Post subject:

DAMMIT!!!

All my personal files and backups are scattered over several truecrypt containers, that are mounted as zfs raids.

And after upgrading to gcc-5.2.0 TrueCrypt no longer works.

It always fails with either "Error: Invalid characters encountered." or "fuse: Invalid mount point".
So if you hit this, do not fall apart just yet. Mount your TrueCrypt Containers and/or volumes like this:

Roman_Gruber · Posted: Thu Sep 03, 2015 1:48 pm Post subject:

yes sure totally unusable now

schorsch_76 · Guru Joined: 19 Jun 2012 Posts: 450

The Problem is you Need to rebuild the libraries and recompile again. This is what i said: "The bumpiest Thing was recompiling 3 times world"
_________________
// valid again: I forgot about the git access. Now 1.2GB big. Start: 2015-06-25
git daily portage tree
Web: https://github.com/schorsch1976/portage
git clone https://github.com/schorsch1976/portage

awalp · n00b Joined: 29 May 2003 Posts: 73

gienah · Developer Joined: 24 Nov 2010 Posts: 212 Location: AU

Letharion · Veteran Joined: 13 Jun 2005 Posts: 1344 Location: Sweden

go-boostrap fails to build on arm.

I tried to compile go-1.5 on arm today, which is the only package to fail for me so far.

Digging into the compile process, it fails on

krinn · Watchman Joined: 02 May 2003 Posts: 7470

That's a nice title, i wonder what "usable" really mean

Can i get a totally unrealistic feeling note about its usability on a 100 base count?

mv · Watchman Joined: 20 Apr 2005 Posts: 6747

Roman_Gruber · Posted: Sun Sep 06, 2015 11:45 am Post subject:

wesnoth does not build with gcc 5.2 on amd 64 wiht both linkers

schorsch_76 · Guru Joined: 19 Jun 2012 Posts: 450

@tw04l124: Some of the dependent libraries is not yet compiled with gcc5.2.

Try to recompile world 3 times ....

krinn · Watchman Joined: 02 May 2003 Posts: 7470

mv · Watchman Joined: 20 Apr 2005 Posts: 6747