[LLVMdev] Enabling the gold linker on freebsd

[John Criswell]

On 6/23/15 1:45 AM, Aditya Verma wrote:
> the symlink ld is already pointing to /usr/bin/ld. Also -fuse-ld=gold 
> does not works on clang in freebsd. I am not sure where is the 
> problem?should I remove /usr/bin/ld and create a new symlink to 
> /usr/local/bin/ld.gold?

Aditya:

I would think that /usr/bin/ld would be BSD ld.  Can you verify whether 
/usr/bin/ld is ld.bfd or ld.gold?  If it's not ld.gold, it won't use the 
Gold plugin.

Rafael:

Does -fuse-ld=gold cause Clang to look for ld.gold, or does it just 
cause Clang to pass the need command-line options to ld to get it to use 
the gold plugin?  Ideally, I'd like to not have to manually modify 
things in /usr/bin to get the Gold plugin working on FreeBSD.  I would 
think that it makes systems upgrades a nightmare.

Regards,

John Criswell
>
> Regards
> Aditya Verma
> Junior Undergraduate
> IDD Computer Sc & Engg
> IIT(BHU), Varanasi(UP)
>
> On Mon, Jun 22, 2015 at 5:25 AM, Rafael Espíndola 
> <rafael.espindola at gmail.com <mailto:rafael.espindola at gmail.com>> wrote:
>
>     Two options:
>
>     * Try passing -fuse-ld=gold to clang.
>     * have 'ld' be a symlink to ld.gold.
>
>     Cheers,
>     Rafael
>
>
>
>     On 22 June 2015 at 04:02, Aditya Verma
>     <aditya.verma.cse12 at iitbhu.ac.in
>     <mailto:aditya.verma.cse12 at iitbhu.ac.in>> wrote:
>     >
>     > I have been trying to enable the gold linker on FreeBSD to use
>     the link time
>     > optimizations. I made gold from the binutils under /usr/ports. After
>     > building binutils using make -k install clean i got ld under
>     /usr/bin and in
>     > the directory /usr/local/bin i got ld, ld.gold and ld.bfd.
>     >
>     > Now while trying to use link time optimization for the simple
>     example
>     > programs herehttp://llvm.org/docs/GoldPlugin.html
>     <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_docs_GoldPlugin.html&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Mfk2qtn1LTDThVkh6-oGglNfMADXfJdty4_bhmuhMHA&m=RiyytjZtbvoW0RgjWgbaDEywnPSEyVOWm21_R6ftAW0&s=9yaRTUr1ClS9IcR4zr7lGBT8Xhpzm_Mgnll4tGNRYXU&e=>
>     (a.c and b.c under the
>     > heading 'Examples of Link Time Optimization') i entered the four
>     commands as
>     > follows:
>     >
>     > clang -flto a.c -c -o a.o
>     > ar q a.a a.o
>     > clang b.c -c -o b.o
>     > clang -flto a.a b.o -o main
>     >
>     > I got the following error:
>     >
>     > usr/bin/ld: unrecogonized option '-plugin'
>     > usr/bin/ld: use the --help option for usage information
>     > clang: error: linker command failed with exit code 1 (use -v to see
>     > invocation)
>     >
>     > Is there the problem with the linker that ld.gold is not being
>     called.
>     > Should I replace the ld with ld.gold? Does the linker looks in
>     the right
>     > directiry for the .so plugins?
>     >
>     > The LLVMgold.so and libLTO.so shared objects are in the directory
>     > /usr/local/llvm-devel/lib/. I cannot find the directory where
>     clang is
>     > installed. I am not sure where to make the bfd-plugins directory
>     and add the
>     > symlinks to LLVMgold.so and libLTO.so.
>     >
>     > I am using freebsd 10.1 release. How to enable the gold linker
>     for link time
>     > optimizations? also how can I enable it to be the default linker?
>     >
>     >
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>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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