[Issue 18433] rdmd doesn't respect DFLAGS for its cache hash

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18433

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |greensunny12 at gmail.com
            Summary|rdmd ignores DFLAGS         |rdmd doesn't respect DFLAGS
                   |                            |for its cache hash

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
Hmm I think the problem is more in DMD not respecting everything from DFLAGS:
However, this has been in master:

cat > foo.d << EOF
void main(){
    import std.stdio;
    version(Foo)
    {
        "foo".writeln;
    }
    else
    {
        "bar".writeln;
    }
}
EOF


```
> dmd -version=Foo foo.d && ./foo
foo
> DFLAGS="-version=Foo" dmd foo.d && ./foo
bar
> DFLAGS="-version=Foo" rdmd --force foo.d
bar
```

(with ~master this correctly yields foo for all commands)

But it looks like rdmd's caching doesn't include a hash of DFLAGS.

```
DFLAGS="-version=Foo" rdmddev foo.d
foo
DFLAGS="-version=Bar" rdmddev foo.d
foo
```

(so I'm renaming this)

--