Manjaro/Arch x86_64, dmd v2.091.0, dub 1.19.0.
I have a project which dmd on Windows fails to compile, throwing
an OutOfMemoryError[1]. Up until recently it could be worked
around by using `--build-mode=singleFile`, but now that's no
longer enough and errors out too (on AppVeyor).
The obvious solution is to set `-lowmem` in dub.sdl, but it seems
to do nothing, as measured *in Linux* by the amount of memory
used with zsh's `time` shell built-in.
If using zsh time, you may need the following environmental
variable to get the required output:
```
TIMEFMT='%J %U user %S system %P cpu %*E total
avg shared (code): %X KB
avg unshared (data/stack): %D KB
total (sum): %K KB
max memory: %M MB
page faults from disk: %F
other page faults: %R'
```
A gutted test branch: (has two dependencies)
git clone https://github.com/zorael/tests.git -b lowmem
1. `dub build` on a default configuration without -lowmem defined
shows some ~2011 Mb used.
2. If I run dub with -v, then copy the dmd command it runs and
execute it manually, I get the same ~2012 Mb used. Close enough,
makes sense.
3. `dub build -c lowmem` for an identical configuration but with
dflags "-lowmem" added, nothing changes and I still get ~2011 Mb
used.
4. If I run dub with -v on the lowmem configuration and
copy/paste *the same command it ran*, unmodified, I suddenly get
the more expected ~1183 Mb used.
Log: https://pastebin.com/raw/yDnCj1KJ
-lowmem is visibly present in the dmd command listed with -v, but
it seems to do nothing through dub.
How? Why?
dub remove lu --version="*"
dub remove dialect --version="*"
[1]: https://issues.dlang.org/show_bug.cgi?id=20562
