[Bug c++/118697] New: static_assert message is not escaped

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118697

            Bug ID: 118697
           Summary: static_assert message is not escaped
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

So there is a different behavior from the C front-end where the non-printable
characters are escaped.
I am not sure if this is a C or C++ front-end issue but it would be good to
have them agree.

Simple testcase:
```
static_assert(0, "\x1b[31mThis should be red\x1b[0m");
```

The C front-end will escape the \x1b while the C++ front-end will just print as
is.