[Bug c++/121528] New: GCC -Wcomment shouldn't warn about multiline comments if the next line looks like a comment

[nikolasklauser at berlin dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121528

            Bug ID: 121528
           Summary: GCC -Wcomment shouldn't warn about multiline comments
                    if the next line looks like a comment
           Product: gcc
           Version: 15.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nikolasklauser at berlin dot de
  Target Milestone: ---

GCC with -Wcomment currently warns on code like

```
// \
//  lhs.assign(rhs.begin(), rhs.end());

// \
void func() {}
```

in both cases, even though it's clear in the first case that both lines are
comments. Clang only warns about the second case:
https://godbolt.org/z/aMTYnqvnq