llvm dev - Jul 2016 - [llvm-3.8.1] /usr/bin/objcopy: unrecognized option '--extract-dwo'

Hi,

I am still struggling with my optimized/speedup build of llvm-toolchain v3.8.1.
Here: Enable LTO, PGO, optimized-TableGen, split-DWARF and build with
GNU/gold and LLVMgold-plugin.

The objcopy (binutils v2.22) here on Ubuntu/precise AMD64 does not
support '--extract-dwo'.

My build fails with... /usr/bin/objcopy: unrecognized option
'--extract-dwo'.

Now, I did a full build of binutils v2.26.1 and using its binaries.

Is it possible to embed a test if objcopy is able to perform
'--extract-dwo'?
( I cannot say which of the speedup options require this option. )

Thanks.

Regards,
- Sedat -
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On Sun, Jul 24, 2016 at 5:58 PM, Sedat Dilek <sedat.dilek at gmail.com>
wrote:
> Hi,
>
> I am still struggling with my optimized/speedup build of llvm-toolchain
v3.8.1.
> Here: Enable LTO, PGO, optimized-TableGen, split-DWARF and build with
> GNU/gold and LLVMgold-plugin.
>
> The objcopy (binutils v2.22) here on Ubuntu/precise AMD64 does not
> support '--extract-dwo'.
>
binuils v2.22 was released 2011-11-21 (see [1])

[2] says about --extract-dwo options...

2012-05-08 Cary Coutant <ccoutant at google.com>
* doc/binutils.texi (objcopy): Add --strip-dwo, --extract-dwo options.
(strip): Add --strip-dwo option.
* objcopy.c (enum strip_action): Add STRIP_DWO, STRIP_NONDWO.
(enum command_line_switch): Add OPTION_EXTRACT_DWO, OPTION_STRIP_DWO.
(strip_options): Add --strip-dwo option.
(copy_options): Add --extract-dwo, --strip-dwo options.
(copy_usage): Likewise.
(strip_usage): Add --strip-dwo option.
(is_dwo_section): New function.
(is_strip_section_1): Check for DWO sections.
(copy_object): Check for --strip-dwo, --extract-dwo options.
(copy_relocations_in_section): Discard relocations for DWO sections.
Discard entire relocation section when no relocations.
(strip_main): Add --strip-dwo option.
(copy_main): Add --strip-dwo, --extract-dwo options.

Hmm, Ubuntu/precise seems to be a bit outdated :-(.

- Sedat -

[1] https://ftp.gnu.org/gnu/binutils/
[2] https://github.com/bennoleslie/binutils/blob/master/binutils/ChangeLog#L259
> My build fails with... /usr/bin/objcopy: unrecognized option
'--extract-dwo'.
>
> Now, I did a full build of binutils v2.26.1 and using its binaries.
>
> Is it possible to embed a test if objcopy is able to perform
'--extract-dwo'?
> ( I cannot say which of the speedup options require this option. )
>
> Thanks.
>
> Regards,
> - Sedat -

On Sun, Jul 24, 2016 at 8:59 AM Sedat Dilek via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> I am still struggling with my optimized/speedup build of llvm-toolchain
> v3.8.1.
> Here: Enable LTO, PGO, optimized-TableGen, split-DWARF and build with
> GNU/gold and LLVMgold-plugin.
>
> The objcopy (binutils v2.22) here on Ubuntu/precise AMD64 does not
> support '--extract-dwo'.
>
> My build fails with... /usr/bin/objcopy: unrecognized option
> '--extract-dwo'.
>
> Now, I did a full build of binutils v2.26.1 and using its binaries.
>
> Is it possible to embed a test if objcopy is able to perform
> '--extract-dwo'?
> ( I cannot say which of the speedup options require this option. )
>
split-DWARF requires objcopy's --extract-dwo. If your tools don't
support
it, turn off split DWARF & you should be fine.

- Dave

>
> Thanks.
>
> Regards,
> - Sedat -
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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On Mon, Jul 25, 2016 at 5:08 PM, David Blaikie <dblaikie at gmail.com>
wrote:
>
>
> On Sun, Jul 24, 2016 at 8:59 AM Sedat Dilek via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>>
>> Hi,
>>
>> I am still struggling with my optimized/speedup build of llvm-toolchain
>> v3.8.1.
>> Here: Enable LTO, PGO, optimized-TableGen, split-DWARF and build with
>> GNU/gold and LLVMgold-plugin.
>>
>> The objcopy (binutils v2.22) here on Ubuntu/precise AMD64 does not
>> support '--extract-dwo'.
>>
>> My build fails with... /usr/bin/objcopy: unrecognized option
>> '--extract-dwo'.
>>
>> Now, I did a full build of binutils v2.26.1 and using its binaries.
>>
>> Is it possible to embed a test if objcopy is able to perform
>> '--extract-dwo'?
>> ( I cannot say which of the speedup options require this option. )
>
>
> split-DWARF requires objcopy's --extract-dwo. If your tools don't
support
> it, turn off split DWARF & you should be fine.
>
[ CC Chris ]

Dave, Thanks for the explanations.
I have filed a bug, see [1].

- Sedat -

[1] https://llvm.org/bugs/show_bug.cgi?id=28737