How do I specify a druntime flag such as

    --DRT-gcopt=gc:precise

when running with dub as

    dub run --compiler=dmd --build=unittest

?

The precise GC flag was introduced in verison 2.085.0

See:
- https://dlang.org/changelog/2.085.0.html#gc_precise
- https://dlang.org/spec/garbage.html#precise_gc

On 24/05/2019 2:50 AM, Per Nordlöw wrote:
> How do I specify a druntime flag such as
> 
>      --DRT-gcopt=gc:precise
> 
> when running with dub as
> 
>      dub run --compiler=dmd --build=unittest

dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise

On Thursday, 23 May 2019 at 14:51:41 UTC, rikki cattermole wrote:
> dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise

Thanks!

And if I want to set this in a dub.sdl?

On Thursday, 23 May 2019 at 14:51:41 UTC, rikki cattermole wrote:
> dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise

Hmm, the flag doesn't propagate to dmd when compiling in verbose mode via -v as

    dub run -v --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise

Shouldn't it?

On 24/05/2019 2:58 AM, Per Nordlöw wrote:
> On Thursday, 23 May 2019 at 14:51:41 UTC, rikki cattermole wrote:
>> dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise
> 
> Thanks!
> 
> And if I want to set this in a dub.sdl?

No can do. There is meant to be a way to set it in D however.
But I have heard mixed results (not that I've tried it).

On 24/05/2019 3:01 AM, Per Nordlöw wrote:
> On Thursday, 23 May 2019 at 14:51:41 UTC, rikki cattermole wrote:
>> dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise
> 
> Hmm, the flag doesn't propagate to dmd when compiling in verbose mode via -v as
> 
>      dub run -v --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise
> 
> Shouldn't it?

No. You told dub to -v.

DFLAGS="-v" dub run --compiler=dmd --build=unittest -- --DRT-gcopt=gc:precise

On Thursday, 23 May 2019 at 15:02:12 UTC, rikki cattermole wrote:
>> And if I want to set this in a dub.sdl?
>
> No can do. There is meant to be a way to set it in D however.
> But I have heard mixed results (not that I've tried it).

Should be as easy as

    dflags "--DRT-gcopt=gc:precise"

right?

On 24/05/2019 3:03 AM, Per Nordlöw wrote:
> On Thursday, 23 May 2019 at 15:02:12 UTC, rikki cattermole wrote:
>>> And if I want to set this in a dub.sdl?
>>
>> No can do. There is meant to be a way to set it in D however.
>> But I have heard mixed results (not that I've tried it).
> 
> Should be as easy as
> 
>      dflags "--DRT-gcopt=gc:precise"
> 
> right?

That would be passed to dmd, not to the build executable upon running.

On Thursday, 23 May 2019 at 15:05:15 UTC, rikki cattermole wrote:
>> Should be as easy as
>> 
>>      dflags "--DRT-gcopt=gc:precise"
>> 
>> right?
>
> That would be passed to dmd, not to the build executable upon running.

You mean wise versa, right?

Now I understand,

--DRT-gcopt=gc:precise

is passed to the resulting binary...

On Thursday, 23 May 2019 at 14:50:12 UTC, Per Nordlöw wrote:
> How do I specify a druntime flag such as
>
>     --DRT-gcopt=gc:precise
>
> when running with dub as
>
>     dub run --compiler=dmd --build=unittest
>
> ?
>
> The precise GC flag was introduced in verison 2.085.0
>
> See:
> - https://dlang.org/changelog/2.085.0.html#gc_precise
> - https://dlang.org/spec/garbage.html#precise_gc

You can put into the source:

extern(C) __gshared string[] rt_options = [
    "gcopt=gc:precise"
];

you can wrap it into some "version ()" and set the version in the dub configuration.