From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Jan Beulich <JBeulich@suse.com>, mpohlack@amazon.de
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
AndrewCooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
philippe.gabriel@citrix.com,
Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v3] gcov: add new interface and 3.4 and 4.7 format support
Date: Wed, 12 Oct 2016 09:44:37 -0400 [thread overview]
Message-ID: <20161012134437.GE27599@char.us.oracle.com> (raw)
In-Reply-To: <57FE57680200007800116BE1@prv-mh.provo.novell.com>
On Wed, Oct 12, 2016 at 07:31:52AM -0600, Jan Beulich wrote:
> >>> On 12.10.16 at 15:23, <konrad.wilk@oracle.com> wrote:
> >> And then - how is all of this supposed to be working in conjucntion
> >> with live patching, where the patch may have been created by yet
> >> another compiler version?
> >
> > Uh, I hope one does not create a livepatch patch with another compiler
> > version!
> >
> > Let me put on the TODO to make livepatch-build-tools check gcc against
> > compile.h so that one does not try this.
>
> What's wrong with mixing compiler versions in general?
Besides scaring me?
The one issue we had encountered was with compilers generating random named
symbols for the switch tables. Those end up being called "CSWTCH.XYZ"
where the XYZ depends on the position of the moon along with how many
goats you have sacrificied to the altar of GCC gods.
Older compilers don't neccessarily do it, newer ones do, and every time
you build an livepatch the naming is different. Frustrating.
It maybe that newer versions of GCC are more predictable about this
naming.
Maybe Martin can share some of his experience? CC-ing him.
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next prev parent reply other threads:[~2016-10-12 13:44 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-10 9:40 [PATCH v2 0/9] Rework gcov support in Xen Wei Liu
2016-10-10 9:40 ` [PATCH v2 1/9] Kconfig: use tab instead of space Wei Liu
2016-10-10 11:21 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 2/9] Kconfig: add BROKEN config Wei Liu
2016-10-10 11:22 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 3/9] xen: delete gcno files in clean target Wei Liu
2016-10-10 11:23 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 4/9] xen, tools: rip out old gcov implementation Wei Liu
2016-10-10 11:24 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 5/9] gcov: add new interface and 3.4 and 4.7 format support Wei Liu
2016-10-10 11:56 ` Jan Beulich
2016-10-10 12:23 ` Andrew Cooper
2016-10-10 12:56 ` Jan Beulich
2016-10-10 13:12 ` Wei Liu
2016-10-10 13:11 ` Wei Liu
2016-10-10 14:43 ` Wei Liu
2016-10-11 10:31 ` [PATCH v3] " Wei Liu
2016-10-12 12:42 ` Jan Beulich
2016-10-12 13:06 ` Wei Liu
2016-10-12 13:11 ` Jan Beulich
2016-10-12 13:24 ` George Dunlap
2016-10-12 13:26 ` George Dunlap
2016-10-12 13:31 ` Wei Liu
2016-10-12 13:33 ` Jan Beulich
2016-10-12 13:34 ` Andrew Cooper
2016-10-12 13:41 ` George Dunlap
2016-10-12 13:43 ` Andrew Cooper
2016-10-12 13:29 ` Konrad Rzeszutek Wilk
2016-10-12 13:40 ` Wei Liu
2016-10-12 13:46 ` Konrad Rzeszutek Wilk
2016-10-12 13:50 ` Wei Liu
2016-10-12 13:23 ` Konrad Rzeszutek Wilk
2016-10-12 13:31 ` Jan Beulich
2016-10-12 13:44 ` Konrad Rzeszutek Wilk [this message]
2016-10-12 14:08 ` Jan Beulich
2016-10-12 14:17 ` Martin Pohlack
2016-10-12 16:21 ` Konrad Rzeszutek Wilk
2016-10-13 8:05 ` Martin Pohlack
2016-10-12 15:33 ` Wei Liu
2016-10-12 15:42 ` Jan Beulich
2016-10-12 17:07 ` Wei Liu
2016-10-13 8:29 ` Jan Beulich
2016-10-13 8:49 ` Wei Liu
2016-10-13 9:15 ` Jan Beulich
2016-10-13 9:20 ` Wei Liu
2016-10-10 9:40 ` [PATCH v2 6/9] gcov: userspace tools to extract and split gcov data Wei Liu
2016-10-10 15:44 ` Ian Jackson
2016-10-10 9:40 ` [PATCH v2 7/9] Config.mk: expand cc-ver a bit Wei Liu
2016-10-10 11:57 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 8/9] Config.mk: introduce cc-ifversion Wei Liu
2016-10-10 12:00 ` Jan Beulich
2016-10-10 13:18 ` Wei Liu
2016-10-10 13:22 ` Jan Beulich
2016-10-10 13:24 ` Wei Liu
2016-10-10 9:40 ` [PATCH v2 9/9] gcov: provide the capability to select gcov format automatically Wei Liu
2016-10-10 12:00 ` Jan Beulich
2016-10-10 15:47 ` [PATCH v2 0/9] Rework gcov support in Xen Ian Jackson
2016-10-10 15:58 ` Jan Beulich
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