[Issue 19382] New: generated dmd should not be the default compiler used to build the tools

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19382

          Issue ID: 19382
           Summary: generated dmd should not be the default compiler used
                    to build the tools
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: tools
          Assignee: nobody at puremagic.com
          Reporter: b2.temp at gmx.com

for the D tools

`make -f posix.mak` fails when the dmd available on the machine is not the one
built from sources.

we are aware that `make -f posix.mak DMD=dmd` works but people should not have
to do that.

reported because of

https://www.reddit.com/r/d_language/comments/9vgf6j/building_dlangtools_error_127/

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