Re: [platform-swt-dev] SWT 4.7 on RedHat 6

[Aleksandar Kurtakov <akurtako@xxxxxxxxxx>]

----- Original Message -----
> From: "Sravan K Lakkimsetti" <sravankumarl@xxxxxxxxxx>
> To: "Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
> Sent: Tuesday, 31 January, 2017 10:54:41 AM
> Subject: Re: [platform-swt-dev] SWT 4.7 on RedHat 6
> 
> 
> 
> Hi Thomas,
> 
> It is built on top of RHEL 7. It requires higher version of GLIBC.

Hi Thomas,

Let me add more details.
First of all the move to RHEL 7 was moved in order to be able to build in sane way as RHEL 6 has no GTK3 so it was either manually hacked env on RHEL 6 or being part of swt on one machine rest on another and what we had was a mixture of the two IIRC. Now build can happen on single machine. All these native parts builds are still happening inside IBM (mostly because of the complicated way of building) and there is work in progress to move it to Eclipse.org infra which will allow community to help and influence the work further.
Now to the dirty technical details - the symbol that requires Glibc 2.14 is memcpy. And it was versioned in 2.14 for the reasons described in http://man7.org/linux/man-pages/man3/memcpy.3.html#NOTES . This could potentially be hacked use the old version via smth like 'asm (".symver memcpy, memcpy@GLIBC_2.2.5");' but we had some hard to find crashers so I would say it's not worth it. Especially considering that RHEL subscriptions cover all active RHEL versions and at the time Oxygen is released RHEL 6 will be in production stage 3 https://access.redhat.com/support/policy/updates/errata#Production_3_Phase developers should start moving to RHEL7.

> 
> Regards,
> Sravan
> 
> 
> -----Original Message-----
> From: Lars Vogel [ mailto:lars.vogel@xxxxxxxxxxx ]
> Sent: Tuesday, January 31, 2017 3:10 PM
> To: Eclipse Platform SWT component developers list.
> <platform-swt-dev@xxxxxxxxxxx>
> Subject: Re: [platform-swt-dev] SWT 4.7 on RedHat 6
> 
> Hi Thomas,
> 
> Eclipse SWT 4.7 requires 2.24 as minimum. See
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=501986
> 
> Best regards, Lars
> 
> On Tue, Jan 31, 2017 at 10:34 AM, Thomas Singer <ts-swt@xxxxxxxxxxx> wrote:
> > Hi all,
> > 
> > Is there a serious reason why SWT 4.7 does not work any more on RedHat 6?
> > 
> > $ cat /etc/redhat-release
> > Red Hat Enterprise Linux Server release 6.8 (Santiago)
> > 
> > SmartGit 17 users are getting:
> > 
> >> java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
> >> Can't load library:
> >> /home/nick/.smartgit/17/swt.tmp/libswt-pi-gtk-4723.so
> >> Can't load library:
> >> /home/nick/.smartgit/17/swt.tmp/libswt-pi-gtk.so
> >> no swt-pi-gtk-4723 in java.library.path
> >> no swt-pi-gtk in java.library.path
> >> /home/nick/.smartgit/17/swt.tmp/libswt-pi-gtk-4723.so:
> >> /lib64/libc.so.6: version `GLIBC_2.14' not found (required by
> >> /home/nick/.smartgit/17/swt.tmp/libswt-pi-gtk-4723.so)
> >> 
> >> at
> >> org.eclipse.swt.internal.Library.loadLibrary(Library.java:327)
> >> at
> >> org.eclipse.swt.internal.Library.loadLibrary(Library.java:236)
> >> at org.eclipse.swt.internal.gtk.OS.<clinit>(OS.java:28)
> >> at
> >> org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:118)
> >> at
> >> org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:80)
> >> at org.eclipse.swt.widgets.Display.<clinit>(Display.java:140)
> >> at com.syntevo.q.gui.cH.a(SourceFile:58)
> >> at smartgit.adV.a(SourceFile:99)
> >> at smartgit.aya.a(SourceFile:258)
> >> at smartgit.aya.a(SourceFile:210)
> >> at smartgit.aes.b(SourceFile:61)
> >> at SmartGit.main(SourceFile:11)
> > 
> > 
> > RedHat 6 only has glibc 2.12 according to the user's feedback.
> > 
> > --
> > Best regards,
> > Thomas Singer
> > =============
> > syntevo GmbH
> > http://www.syntevo.com
> > http://www.syntevo.com/blog
> > _______________________________________________
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> 
> 
> 
> --
> Eclipse Platform UI and e4 project co-lead CEO vogella GmbH
> 
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-- 
Alexander Kurtakov
Red Hat Eclipse team