Re: Slow linking for ARM

[Bryan Hundven <bryanhundven at gmail dot com>]

On Fri, Dec 24, 2010 at 12:00 PM, Bryan Hundven <bryanhundven@gmail.com> wrote:
> On Fri, Dec 24, 2010 at 11:52 AM, Bryan Hundven <bryanhundven@gmail.com> wrote:
>> On Fri, Dec 24, 2010 at 10:02 AM, Yann E. MORIN
>> <yann.morin.1998@anciens.enib.fr> wrote:
>>> Bryan, Titus, Bill, All,
>>>
>>> On Friday 24 December 2010 15:53:28 Bill Pringlemeir wrote:
>>>> The 'gold' linker has far higher performance for C++
>>>> applications with large name mangling, etc.
>>>
>>> What does it take to replace standard ld with gold? Maybe this could be
>>> an option in crosstool-NG (for those architectures which gold supports).
>>
>> I know that --enable-gold will make binutils with the gold linker 'ld.gold'.
>> I'm not sure if it applies to older versions of binutils, but with
>> more recent snapshots, you can configure:
>>
>> Â--enable-gold[=ARG] Â Â build gold [ARG={default,yes,no}]
>> Â--enable-ld[=ARG] Â Â build ld [ARG={default,yes,no}]
>>
>> So, you could say gold is the default and also build the normal ld as 'ld.bfd':
>>
>> (comment from v2.21 of binutils configure.ac)
>>
>> # Handle --enable-gold, --enable-ld.
>> # --disable-gold [--enable-ld]
>> # Â Â Build only ld. ÂDefault option.
>> # --enable-gold [--enable-ld]
>> # Â Â Build both gold and ld. ÂInstall gold as "ld.gold", install ld
>> # Â Â as "ld.bfd" and "ld".
>> # --enable-gold=default [--enable-ld]
>> # Â Â Build both gold and ld. ÂInstall gold as "ld.gold" and "ld",
>> # Â Â install ld as "ld.bfd".
>> # --enable-gold[=default] --disable-ld
>> # Â Â Build only gold, which is then installed as both "ld.gold" and "ld".
>> # --enable-gold --enable-ld=default
>> # Â Â Build both gold (installed as "ld.gold") and ld (installed as "ld"
>> # Â Â and ld.bfd).
>> # Â Â In other words, ld is default
>> # --enable-gold=default --enable-ld=default
>> # Â Â Error.
>>
>> Where as 2.20.1 just had --enable-gold, which would use the gold
>> linker instead of the bfd linker.
>>
>> It sounds like the new options are different that the release
>> versions, so you might have to look through each version and add
>> something like
>> BINUTILS_2_20_1_or_later
>> BINUTILS_2_21_or_later
>>
>>
>>> And Merry X-Mas to all! :-)
>>>
>>> Regards,
>>> Yann E. MORIN.
>>>
>>> --
>>> .-----------------.--------------------.------------------.--------------------.
>>> | ÂYann E. MORIN Â| Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
>>> | +33 662 376 056 | Software ÂDesigner | \ / CAMPAIGN Â Â | Â___ Â Â Â Â Â Â Â |
>>> | +33 223 225 172 `------------.-------: ÂX ÂAGAINST Â Â Â| Â\e/ ÂThere is no Â|
>>> | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL  Â|  v  conspiracy. Â|
>>> '------------------------------^-------^------------------^--------------------'
>>>
>
> I guess I also forgot to mention that with gold on 2.21, you can
(and 2.20.1)
> --enable-threads to enable multi-threaded linking, and
> --enable-plugins to enable linker plugins (like whopr and lto, and
> possibly more in the future...)
>
>> -Bryan
>>
>
> -Bryan
>
Sorry for the excessive noise...

-Bryan

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