<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/89323>89323</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            NSString Warning Not Needed
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          RuiCuco
      </td>
    </tr>
</table>

<pre>
    I'm doing my own string class in Objective-C called 'kString'. If I compile the project with the compiler option '-fconstant-string-class=kString', I get the following warning:

```
test.m:43:11: warning: incompatible pointer types initializing 'kString *' with an expression of type 'NSString *' [-Wincompatible-pointer-types]
   43 |         kString *k = @"Hello!\n";
      |                  ^ ~~~~~~~~~~~
```

clang shouldn't issue any warning because it works everytime I use the @"" literal. The pointer types are not incompatible: I tested it and it simply works! No warning needed!

By the way, how about implementing a similar mechanism for the other @ literals? I could say, for example:

```
@interface kObject
{
        Class isa;
}
@end

@interface kInt : kObject
{
        int i;
}
@end

@interface kFloat : kObject
{
        float f;
}
@end

int main(void)
{
        kInt *myInt = @42;
        kFloat *myFloat = @3.14f;

        return 0;
}
```
and then compile with the compiler options '-fconstant-int-class=kInt' and '-fconstant-float-class=kFloat' to generate the correct code. Why am I asking you to go to all this trouble? Because it's coherent with the string mechanism mentioned above and because the Objective-C language should't expect anything from its libraries, no class names and no method names, as much as possible. That is, only the structure of data is important, like a string object being expected to have a 'Class isa', a 'char* cString', and an 'unsigned int length'. The rest should be at the programmer's discretion. It's good design, I think.

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyUVk3PozYQ_jXOZZQIDFmSQw55k0bN5a3UrbTnASbgxtiRbd4sPfS3V2PI13a3HygCgWee-X4m6L1qDNFGLN_Ecj_DPrTWbX7t1a6v7Ky09bA5Cll0UFtlGugGsFcDPjh-qzR6D8rAL-XvVAX1QfMdVKg11SBkcf4cxYQsFnA8wREq212UJggtwcVZ1oGrCm38MB06sJegrGGA-amyxgc0YT5anEeLIts_oIXcwREaChHkZLW2V_btis6wRLYVyV4kt_unZPrF10A-LDqRbfNMZNs0Fdn2SRGUYacwqFITXKwygRyE4UIctAoKtfqDbT1iBSG3QhZjVGiAvl4cec_x2FNUZeH3z6_SYvk2__JsbD4Zm0djYrkf3QWAPANR7OB2PZk9g8j2IPJESPkzaW2FTMVyZ4SUInu7AwC8ANwvsfwJ_nxc303XeK80mgZ8a3tdGyGLAMr7ngDNcEselFRh7wlUgKt1Zw_0QW4IqiM4Ah9wsUZfhZSgVSCHegG_td8mGh2BseGlFlybI3DxqGYTaOLDq-6ih9GgkCm827s_hqimmjPyFMjbEN244sBN1NorYGn7AAxDHZnAmsiwSqODjqoWjfIdnKyLmja05DiMWwBeZIfY572uwY-4LExfkTH_uRlFnsTAT1gRnMeRmk6Kt5veejfOnMd7UUWxvwOQqV8svEAeTQBO3Q-xlQmg_j_uQVv8F-RTFDn9F2x2okNlhFx9WFULuf473BiK3HbDGFPs-_zR5ywyecVCNwejWLZI8ydHbvKOQu8MJN9x8bVM3GyhJXNnsx8xmP-GwpQJD_46msCTz2CvUjFTD7noOksGCw0ZchhoMuYc82dla1rAl3YA7OAI6M_ctYPto4blO2oNoVUegrN9HJ8DvN0HVMjCQ2VbcmSe6Hii-EfTx4Gwhmqekg-Krt_GnBWedwAzRI8NTSwRSYK-XthfNENoGfnkbAcqeNCqdOgUeZ4WY6etYrDj6Tc1f-ootLYev7EUeuj6quXnxXrPnMDcgUxFfG6NHm5R9FXoHTH91hgQlOf5to6TzaJanYmHfAzXxiCgJH4ZPaaac9gih8y1egzguHzix6pFJ-QWqpe9xN5j3GS9iXu2Bu5uTaYJbVyLzHeOfJgSBSUBhtt-bBx2HblYoFr5yhEXYAHHsWaNtTXUxMDjEuS8nhdjl87qTVavszXOaJMWaZYXxUquZ-1mXcoyXddyhWWSVgUWeZFIXKfrYkXlJ4kztZGJzJM8XUmZZPl6kaaFXKVIn9IqwyxZ8ch2qPRC649uYV0zi_y_Wa0zmc00lqR9_D8hpaHruByY55f7mduwzrzsGy_yRCsf_AMlqKBpc9-NXybqfrcB3iN9z3qnN20IF89EKg9CHhoV2r5cVLYT8sBI02M-_b0Q8hDteyEP0b-_AgAA__8UL9FD">