llvm dev - Mar 2010 - [LLVMdev] gold plugin use

---- Original message ----
>Date: Wed, 10 Mar 2010 22:09:22 -0800
>From: Nick Lewycky <nicholas at mxc.ca>  
>Subject: Re: [LLVMdev] glod plugin use  
>To: Swarup Kumar Sahoo <ssahoo2 at illinois.edu>
>Cc: llvmdev at cs.uiuc.edu, Rafael Espindola <espindola at google.com>
>
>Swarup Kumar Sahoo wrote:
>> Hi,
>>      I was trying to use gold plugin to compile and run some of my
passes on some large softwares like mysql, apache etc. When I compile using
llvm-gcc, everything works fine. But, when I followed the instructions on
http://llvm.org/docs/GoldPlugin.html#build to use gold plugin, I got errors
like:
>>
>> /home/vadve/ssahoo2/local/bin/ld: error:
modules/standard/libstandard.a: no archive symbol table (run ranlib)
>> /home/vadve/ssahoo2/local/bin/ld: error: modules/extra/libextra.a: no
archive symbol table (run ranlib)
>> /home/vadve/ssahoo2/local/bin/ld: error: main/libmain.a: no archive
symbol table (run ranlib)
>> ....
>>
>> I tried ranlib/llvm-ranlib, but it didn't work. Can someone help
me, if I am doing anything wrong here?
>
>You shouldn't need ranlib nor llvm-ranlib.
>
>I'm not entirely sure what's up with the .a files. It looks like ar
has
>grown a --plugin options to match gold, whereas I seem to recall it used 
>to just look in a fixed directory.
>
>Rafael, have you been following what binutils has done with plugins for 
>ar, nm and friends? It looks like we might need to update llvm-gcc to 
>pass the gold plugin flag to ar and nm.
Yes, ar and nm actually take -plugin option and if I pass this option, then I
don't get these errors. But, llvm-gcc doesn't automatically pass this
option to ar.
>
>Nick
>
>>
>> Thanks,
>> Swarup.
>>
>> *************************************
>> Swarup Kumar Sahoo
>> Thomas M. Siebel Center for Computer Science
>> University of Illinois at Urbana Champaign
>> 201 N Goodwin Avenue
>> Urbana, IL-61801
>> Phone - 614 264 9574
>>
>> *************************************
>> Swarup Kumar Sahoo
>> Thomas M. Siebel Center for Computer Science
>> University of Illinois at Urbana Champaign
>> 201 N Goodwin Avenue
>> Urbana, IL-61801
>> Phone - 614 264 9574
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
*************************************
Swarup Kumar Sahoo
Thomas M. Siebel Center for Computer Science
University of Illinois at Urbana Champaign
201 N Goodwin Avenue
Urbana, IL-61801
Phone - 614 264 9574

> Yes, ar and nm actually take -plugin option and if I pass this option, then
I don't get these errors. But, llvm-gcc doesn't automatically pass this
option to ar.
You probably just need to copy the gold plugin to
$PREFIX/lib/bfd-plugins. Let me know if that works. If not I will
check if there is a bug in the plugin search in binutils.

Cheers,
-- 
Rafael Ávila de Espíndola

>
>> Yes, ar and nm actually take -plugin option and if I pass this option,
then I don't get these errors. But, llvm-gcc doesn't automatically pass
this option to ar.
>
>You probably just need to copy the gold plugin to
>$PREFIX/lib/bfd-plugins. Let me know if that works. If not I will
>check if there is a bug in the plugin search in binutils.
There is no problem in plugin search. If I give -plugin \path\to\plugin option
to ar and nm, they are working fine. But, llvm-gcc doesn't pass this option
to ar and nm automatically, so when I compile apache, I get those errors. When I
wrote a small script to run ar with -plugin option for compiling apache, then I
don't get these errors.

BTW, there is no directory called bfd_plugins inside lib. I think, there is some
mistake in the documentation. I just copied the plugin to /lib directory and it
works fine.

-Swarup.
>
>Cheers,
>-- 
>Rafael Ávila de Espíndola
*************************************
Swarup Kumar Sahoo
Thomas M. Siebel Center for Computer Science
University of Illinois at Urbana Champaign
201 N Goodwin Avenue
Urbana, IL-61801
Phone - 614 264 9574