How to stop DMD from exploding the executable file size?

[ryuukk_]

```
$ ldc2 -m64 app.d
$ ll
total 4545
-rw-r--r-- 1 ryuukk 197121      69 Aug 31 00:57 app.d
-rwxr-xr-x 1 ryuukk 197121  453120 Aug 31 00:57 app.exe*
-rw-r--r-- 1 ryuukk 197121 4195865 Aug 31 00:57 app.obj
```

```
$ dmd -m64 app.d
$ ll
total 8617
-rw-r--r-- 1 ryuukk 197121      69 Aug 31 00:57 app.d
-rwxr-xr-x 1 ryuukk 197121 4623872 Aug 31 00:57 app.exe*
-rw-r--r-- 1 ryuukk 197121 4196322 Aug 31 00:57 app.obj
```