[Bug c++/104640] New: incomplete unicode support for User-defined literals

[Bug c++/104640] New: incomplete unicode support for User-defined literals

[maik.urbannek at cattatech dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104640

            Bug ID: 104640
           Summary: incomplete unicode support for User-defined literals
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: maik.urbannek at cattatech dot de
  Target Milestone: ---

```
int operator""_π(const unsigned long long i){return (static_cast<int>(i));}

template <char...> double operator "" _π(){return 12.0;}

int main() {
    const double d=0.0_π;
    return 234_π+static_cast<int>(d);
}
```

In my opinion this should work (clang compiles it).

gcc produces the following error:
```
 error: expected initializer before '\U000003c0'
    1 | int operator""_π(const unsigned long long i){return
(static_cast<int>(i));}
      |                ^
Compiler returned: 1
```

Gcc(since gcc10) can compile the second operator (line 3), but not the first
(line 1).

[Bug preprocessor/104640] incomplete unicode support for User-defined literals

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104640

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-02-24
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug preprocessor/104640] incomplete unicode support for User-defined literals

[pacoarjonilla at yahoo dot es]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104640

Paco Arjonilla <pacoarjonilla at yahoo dot es> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pacoarjonilla at yahoo dot es

--- Comment #2 from Paco Arjonilla <pacoarjonilla at yahoo dot es> ---
Here is another test case with macros.

```
#define MACRO(suffix) \
double operator "" _##suffix (long double arg) \
{ return arg; }\
double operator ""_##suffix (long long unsigned arg) \
{ return arg; }


MACRO(km)
MACRO(m)
MACRO(mm)
MACRO(µm) // <-- COMPILATION ERROR (should compile)
```

[Bug preprocessor/104640] incomplete unicode support for User-defined literals

[pacoarjonilla at yahoo dot es]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104640

--- Comment #3 from Paco Arjonilla <pacoarjonilla at yahoo dot es> ---
(In reply to Paco Arjonilla from comment #2)

Compiler output:

<source>:4:17: error: pasting """_" and "\U000000b5m" does not give a valid
preprocessing token
    4 | double operator ""_##suffix (long long unsigned arg) \
      |                 ^~~
<source>:11:1: note: in expansion of macro 'MACRO'
   11 | MACRO(µm) // <-- COMPILATION ERROR (should compile)
      | ^~~~~
<source>:11:7: error: expected initializer before '\U000000b5m'
   11 | MACRO(µm) // <-- COMPILATION ERROR (should compile)
      |       ^~
<source>:4:22: note: in definition of macro 'MACRO'
    4 | double operator ""_##suffix (long long unsigned arg) \
      |                      ^~~~~~

[Bug preprocessor/104640] incomplete unicode support for User-defined literals

[lhyatt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104640

Lewis Hyatt <lhyatt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |lhyatt at gcc dot gnu.org
         Resolution|---                         |DUPLICATE

--- Comment #4 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
Dup of PR103902. I'll take a look.

*** This bug has been marked as a duplicate of bug 103902 ***