Is Phobos compiled with LTO enabled?

On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
> Is Phobos compiled with LTO enabled?

There is no LTO with D.

Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

> On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
>> Is Phobos compiled with LTO enabled?
>
> There is no LTO with D.
Yes it is
https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

On 3/5/17 6:17 PM, Las wrote:
> Is Phobos compiled with LTO enabled?

LTO is *link* time optimization so I'd say it makes no sense for libraries, as they are not linked.

---
Dmitry Olshansky

On Sunday, 5 March 2017 at 21:00:32 UTC, Dmitry Olshansky wrote:
> On 3/5/17 6:17 PM, Las wrote:
>> Is Phobos compiled with LTO enabled?
>
> LTO is *link* time optimization so I'd say it makes no sense for libraries, as they are not linked.
>
> ---
> Dmitry Olshansky

Shared libraries are linked.

On Sunday, 5 March 2017 at 21:00:32 UTC, Dmitry Olshansky wrote:
> On 3/5/17 6:17 PM, Las wrote:
>> Is Phobos compiled with LTO enabled?
>
> LTO is *link* time optimization so I'd say it makes no sense for libraries, as they are not linked.

Static libraries _are_ linked into your executable and LTO is very relevant for libraries.
Having druntime and/or Phobos compiled with LTO enabled can provide massive speedups.
I have not worked on it yet, but it'd be awesome if we could ship LDC with LTO versions of druntime and Phobos. PRs with additions to our CMake files are very welcome! :-)

cheers,
  Johan

On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
> Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):
>
>> On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
>>> Is Phobos compiled with LTO enabled?
>>
>> There is no LTO with D.
> Yes it is
> https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

And it appeared first in the recent LDC 1.1 release.

-Johan

On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
> Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):
>
>> On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
>>> Is Phobos compiled with LTO enabled?
>>
>> There is no LTO with D.
> Yes it is
> https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

Being specific only for LDC and only on linux - it's a lie to say simple « yes ».

On Tuesday, 7 March 2017 at 18:15:52 UTC, Temtaime wrote:
> On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
>> Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):
>>
>>> On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
>>>> Is Phobos compiled with LTO enabled?
>>>
>>> There is no LTO with D.
>> Yes it is
>> https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html
>
> Being specific only for LDC and only on linux - it's a lie to say simple « yes ».

Cheer up, you wrote "there is no LTO with D", which there clearly is. :-)

It works on OS X too.
And OS X is the only platform for which we package the LTO linker binaries in the release.

-Johan

On Tuesday, 7 March 2017 at 18:42:40 UTC, Johan Engelen wrote:
>
> It works on OS X too.
> And OS X is the only platform for which we package the LTO linker binaries in the release.

Has anybody tried LLD on Windows for D already?
https://lld.llvm.org/windows_support.html

If LLD works (or another linker that can use the LLVM plugin), then LTO is also available on Windows.

-Johan