[Bug c++/95553] New: Incorrect/misspelled designators not triggering compilation error

[Bug c++/95553] New: Incorrect/misspelled designators not triggering compilation error

[alex at weej dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95553

            Bug ID: 95553
           Summary: Incorrect/misspelled designators not triggering
                    compilation error
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alex at weej dot com
  Target Milestone: ---

The following code, I believe, should not compile in C++20 or otherwise (we use
it in gnu++17 mode).

#include <string>

auto take_a_string(std::string const& wat) -> void;

auto test() {
    take_a_string({.anything_goes_here = "banana"});
}


Tested this on GCC 7 and GCC trunk today on https://godbolt.org/z/ANNyL6

Note that Clang does treat this as an error.

Thanks

[Bug c++/95553] Incorrect/misspelled designators not triggering compilation error

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95553

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We warn with -Wpedantic and error with -pedantic-errors.

[Bug c++/95553] Incorrect/misspelled designators not triggering compilation error

[sergey at murzin dot pw]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95553

Sergei Murzin <sergey at murzin dot pw> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sergey at murzin dot pw

--- Comment #2 from Sergei Murzin <sergey at murzin dot pw> ---
(In reply to Marek Polacek from comment #1)
> We warn with -Wpedantic and error with -pedantic-errors.

That is warning for using designated initializers pre-C++20. With C++20 above
code compiles with -Wpedantic without error or warning.
The problem above though, is that the deisgnated intializer is successfully
constructing a string using non-existent designator.