Re: [rvm-research] Questions on perf tool usage in JikesRVM

Hi Erik,

Thank you for help!
This one works better than mine.
 
Thanks!
Best
Junjie


________________________________
 From: Erik Brangs <[email protected]>
To: Junjie Qian <[email protected]>; "General discussion of Jikes RVM design, implementation, issues, and plans" <[email protected]> 
Sent: Thursday, August 22, 2013 9:26 AM
Subject: Re: [rvm-research] Questions on perf tool usage in JikesRVM
 

Hi,

On 21.08.2013 04:20, Junjie Qian wrote:
> Because sys.C in JikesRVM is built with old gcc toolchain,

By default, sys.C is built using /usr/bin/gcc. You can change the
compiler and the compiler options by editing the appropriate properties
file in build/hosts in your Jikes RVM directory.

> I changed the line in build.xml as "<arg
> line="-Wl,--no-as-needed ${c++.args} ${rvm.common.args} ${gcspy.lib.dir}
> -lpthread ${perfevent.lib} ${c++.librt} ${rvm.src} ${c++.rdynamic} -g"/>"

It seems the linking order is currently wrong when building with
perfevent. "${perfevent.lib}" needs to come after "${rvm.src}" instead
of before it. You can try to use

<arg line="${c++.args} ${rvm.common.args} ${gcspy.lib.dir} ${rvm.src}
${perfevent.lib} ${c++.librt} -lpthread ${c++.rdynamic} -g"/>

instead of using "-Wl,--no-as-needed".


Kind regards,

Erik Brangs

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