[lttng-dev] Patches to enable building on CentOS 5.x (glibc 2.5)

[David OShea]

Hi Yannick,

Yes, we patched the latest (as of around a month ago) versions to work on CentOS 5.  Sorry, I neglected to mention that this is for UST only, not kernel tracing, hence my not saying anything about the modules!

If the changes aren't going to go upstream into the git repositories, I imagine there is more chance of the CentOS 5 support becoming broken - something could be committed upstream that requires further patching, or conflicts with the patches.  In this case, then, I don't think EPEL packages would help us much, and quite possibly nobody else is interested in CentOS 5 :)  Also, we needed to backport some lttng-ust commits from master to get support for dynamic trace providers to work, so we're more interested in seeing future releases include the changes than seeing a patched version of the current release, and therefore I don't think there would be any value in us moving to an EPEL package for the same version of LTTng that we're already using.

I can certainly provide the patches to you anyway, but I'm not so keen to spend time improving them if they're not going upstream, e.g. one thing I think needs to be investigated is whether the kernel versions provided by CentOS 5 include the system calls that we had to add wrappers for; I haven't paid any attention to what kernel version I'm using, I'm not sure if it is a standard CentOS 5 one.

Thanks!
David


From: Brosseau, Yannick [mailto:yannick.brosseau at gmail.com]
Sent: Friday, 17 May 2013 12:44 AM
To: David OShea
Cc: lttng-dev at lists.lttng.org
Subject: Re: [lttng-dev] Patches to enable building on CentOS 5.x (glibc 2.5)

Hi,

So you made it work with CentOS 5?
I don't know if we want it upstream, but I could maybe use them to build a package for EPEL5.
Yannick

On Wed, May 15, 2013 at 7:38 AM, David OShea <David.OShea at quantum.com<mailto:David.OShea at quantum.com>> wrote:
Hi,

Would contributions of patches to enable lttng-tools and lttng-ust to build with glibc 2.5 (as is shipped with CentOS 5.x) and to enable lttng-gen-tp to run with Python 2.4 (as shipped on CentOS 5.x) be accepted?

What is missing from glibc 2.5 is:

- a system call wrapper for sched_getcpu()
- a system call wrapper for sync_file_range()
- htobe32() and other similar endian conversion functions

babeltrace and userspace-rcu did not require patching.

Thanks in advance,
David

P.S. If you see this, thanks for all your recent replies, Mathieu, I will try to get back to you soon!

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Yannick Brosseau
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