[llvm-bugs] [Bug 29008] New: Support the #line directive in source-based code coverage

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29008

            Bug ID: 29008
           Summary: Support the #line directive in source-based code
                    coverage
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vsk at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Consider:

```
#line 42 "other.cpp"
int main() { return 0; }
```

The report currently looks like:

```
foo.c:
       |    1|#line 42 "other.cpp"
      1|    2|int main() { return 0; }
```

Use a sub-view to display the current filename and line number. On the clang
side, we need to include the right information from the #line directive in the
coverage mapping. Then we need to teach llvm-cov to display the sub-view.

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