[Issue 17300] New: Enable setting code coverage options on the command line

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17300

          Issue ID: 17300
           Summary: Enable setting code coverage options on the command
                    line
           Product: D
           Version: D2
          Hardware: x86
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: jrdemail2000-dlang at yahoo.com

The core.runtime functions dmd_coverSetMerge, dmd_coverSourcePath, and
dmd_coverDestPath are quite use when generating code coverage reports. This is
especially true when generating reports involving multiple runs, multiple
executable sharing code, etc. 

The main downside is that they are only available from the source code being
compiled. It would be much more flexible to have a run-time configurable
setting. One use case is with unit tests run directly as result of a compiler
build line. Another is building an executable with code coverage turned on,
then running the executable multiple times for tests.

One solution might be to use "--DRT-<option>" command line arguments, similar
to those used to set GC options on the command line. (See
https://dlang.org/spec/garbage.html#gc_config). These are nice because they are
processed and removed prior to any other command line argument processing.

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