[Issue 18964] New: -m32 should mean COFF, default is not useful

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18964

          Issue ID: 18964
           Summary: -m32 should mean COFF, default is not useful
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: turkeyman at gmail.com

`-m32` should be changed to `-m32omf`, and mscoff should be default. They need
to match and nobody should experience nasty surprises about object format
mismatches when trying to do 32bit builds.

The default (no -m arg given) current emits 32bit OMF. This isn't generally
helpful.
Personally, I think it's also time that DMD chose -m64 by default when no
argument is given; it's 2018, it's been over a decade since it was possible to
buy a 32bit x86.

I had to pacify a frustrated colleague who wasted their time trying to work out
why the x86 build wouldn't link, and explain the back-story. They were not at
all satisfied with my explanation >_<

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