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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug d/103728] Allow to run unittests before main()
Date: Wed, 15 Dec 2021 22:57:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103728

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
Not sure if there'd be much help from the compiler on this front, as it's a
runtime library feature that unittests are executed in the first place - the
compiler simply generates functions in the proper place for the library to =
find
them.

See
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dblob;f=3Dlibphobos/libdruntime/rt/=
dmain2.d;h=3Db363e3fea4fc55d9f6941030dc808e5129bd38c2;hb=3DHEAD#l491

The old behaviour was of `runAll()` was:

    if (rt_init() && runModuleUnitTests())
        tryExec({ result =3D mainFunc(args); });

> someone suggested to use this:
> version (unittest) extern(C) __gshared string[] rt_options =3D [ "testmod=
e=3Drun-
> main" ];
> It works well with gdc-12, but it is very cryptic and still hard to add i=
n all
> our binaries (we have dozens).
A second way of doing the would be to run the program with the command-line
option: --DRT-testmode=3Drun-main

The options itself gets filtered from the `string[] args` parameter of D ma=
in,
so it won't affect tests where arguments are given to binaries (unless the
--DRT option appears after `--`).=