On Friday, 31 May 2019 at 10:27:44 UTC, Anonymouse wrote:

What is the correct way?

--DRT flags are for run time, not compile time. They're intended to be passed to your executable and not the compiler. From the docs [1]:

"By default, GC options can only be passed on the command line of the program to run"

With dub, anything following a solitary -- on the command line will be passed to the application [2], so you probably want something like this:

dub test -- --DRT-gcopt=profile:1

[1] https://dlang.org/spec/garbage.html#gc_config
[2] https://dub.pm/commandline

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