llvm dev - Mar 2011 - [LLVMdev] gold plugin example

On 11-03-21 10:35 PM, Sangmin Park wrote:
> Hi,
>
> I fixed error by using different version of ld with LLVM 2.7.
> I used ld.gold that comes with Ubuntu 10.04.
> Here is the version info:
>
> sangmin at sangmin-desktop:/tmp$ ld -v
> GNU gold (GNU Binutils for Ubuntu 2.20.1-system.20100303) 1.9
>
> My experience of gold plugin is as follows:
>
> LLVM 2.7 (with libLLVMgold.so) + ld 2.20.1 (from Ubuntu 10.04) : O
> LLVM 2.7 (with libLLVMgold.so) + ld 2.21.51 (manually compiled) : X
> LLVM 2.8 (with LLVMgold.so) + ld 2.20.1 (from Ubuntu 10.04): X
> LLVM 2.8 (with LLVMgold.so) + ld 2.21.51 (manually compiled): X
>
> When compiling (lib)LLVMgold.so file, I used the source file from ld
> 2.21.51.
>
> I can work with LLVM 2.7 and ld 2.20.1 now, but am curious with the result.
> Can you explain what part I did wrong?
>
> Thanks,
> Sangmin
>
>
>
> On Mon, Mar 21, 2011 at 9:13 PM, Sangmin Park <sangmin.park at gmail.com
> <mailto:sangmin.park at gmail.com>> wrote:
>
>     Hi all,
>
>     I got an error from the gold plugin example in the following link:
>     http://llvm.org/docs/GoldPlugin.html#example1
>
>     Here is the error message:
>
>     sangmin at sangmin-desktop:/tmp$ llvm-gcc -use-gold-plugin a.a b.o -o
main
>     /usr/bin/ld: error: a.a: no archive symbol table (run ranlib)
Looks like ar is not using the plugin. Have you created the links in 
bfd-plugins? Can you run nm in a IL file?

Cheers,
Rafael

On Tue, Mar 22, 2011 at 9:19 AM, Rafael Avila de Espindola <
rafael.espindola at gmail.com> wrote:
> On 11-03-21 10:35 PM, Sangmin Park wrote:
> > Hi,
> >
> > I fixed error by using different version of ld with LLVM 2.7.
> > I used ld.gold that comes with Ubuntu 10.04.
> > Here is the version info:
> >
> > sangmin at sangmin-desktop:/tmp$ ld -v
> > GNU gold (GNU Binutils for Ubuntu 2.20.1-system.20100303) 1.9
> >
> > My experience of gold plugin is as follows:
> >
> > LLVM 2.7 (with libLLVMgold.so) + ld 2.20.1 (from Ubuntu 10.04) : O
> > LLVM 2.7 (with libLLVMgold.so) + ld 2.21.51 (manually compiled) : X
> > LLVM 2.8 (with LLVMgold.so) + ld 2.20.1 (from Ubuntu 10.04): X
> > LLVM 2.8 (with LLVMgold.so) + ld 2.21.51 (manually compiled): X
> >
> > When compiling (lib)LLVMgold.so file, I used the source file from ld
> > 2.21.51.
> >
> > I can work with LLVM 2.7 and ld 2.20.1 now, but am curious with the
> result.
> > Can you explain what part I did wrong?
> >
> > Thanks,
> > Sangmin
> >
> >
> >
> > On Mon, Mar 21, 2011 at 9:13 PM, Sangmin Park <sangmin.park at
gmail.com
> > <mailto:sangmin.park at gmail.com>> wrote:
> >
> >     Hi all,
> >
> >     I got an error from the gold plugin example in the following link:
> >     http://llvm.org/docs/GoldPlugin.html#example1
> >
> >     Here is the error message:
> >
> >     sangmin at sangmin-desktop:/tmp$ llvm-gcc -use-gold-plugin a.a b.o
-o
> main
> >     /usr/bin/ld: error: a.a: no archive symbol table (run ranlib)
>
> Looks like ar is not using the plugin. Have you created the links in
> bfd-plugins? Can you run nm in a IL file?
>
>
I have created the links in bfd-plugins, but I had some mistakes in handling
versions. Now, I found that all combinations of versions work well for the
example.

By the way, how can I manually check whether ar and nm work?

Thanks,
Sangmin


> Cheers,
> Rafael
> _______________________________________________
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> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>
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> 
> I have created the links in bfd-plugins, but I had some mistakes in
> handling versions. Now, I found that all combinations of versions work
> well for the example.
> 
> By the way, how can I manually check whether ar and nm work?
Both take --plugin options. You can run nm in a plugin file to see if it
can print the symbols. You can also create an archive with some IL file
in it and check the armap by running "nm -s" in the produced .a file.
> Thanks,
> Sangmin
Cheers,
Rafael