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digitalmars.D.learn - betterC: string mixins in module - again

reply DLearner <bmqazwsx123 gmail.com> writes:
Got a highly reduced example:

The following code works perfectly
```
extern(C) void main() {

    string mxnInit(string parmScrnDef) {
       if(__ctfe) {
          return   `{` ~

                      `enum NoOfScrns = 4;` ~

                      `string [NoOfScrns] ScreenNames;` ~
                      `import core.stdc.stdio : printf; 
printf("NoOfScrns = %d\n", cast(int)(NoOfScrns)); ` ~

                   `}`;
       } else {
          return   ``;
       }
    }

    mixin(mxnInit("NPL4"));
}
```


But split things so that ctfemod contains
```
    string mxnInit(string parmScrnDef) {
       if(__ctfe) {
          return   `{` ~

                      `enum NoOfScrns = 4;` ~

                      `string [NoOfScrns] ScreenNames;` ~
                      `import core.stdc.stdio : printf; 
printf("NoOfScrns = %d\n", cast(int)(NoOfScrns)); ` ~

                   `}`;
       } else {
          return   ``;
       }
    }
```

Called from a master:
```
extern(C) void main() {

    import ctfemod;

    mixin(mxnInit("NPL4"));
}
```

And we get: (DMD64 D Compiler v2.111.0)
```
ctfemst.obj : error LNK2019: unresolved external symbol 
_memset128ii referenced in function main
ctfemst.exe : fatal error LNK1120: 1 unresolved externals
Error: linker exited with status 1120
        C:\Program Files\Microsoft Visual 
Studio\2022\Community\VC\Tools\MSVC\14.41.34120\bin\HostX64\x64\link.exe
/NOLOGO "ctfemst.obj"    /LIBPATH:"C:\Program Files\Microsoft Visual
Studio\2022\Community\VC\Tools\MSVC\14.41.34120\lib\x64"
legacy_stdio_definitions.lib /LIBPATH:"C:\Program Files (x86)\Windows
Kits\10\Lib\10.0.22000.0\ucrt\x64" /LIBPATH:"C:\Program Files (x86)\Windows
Kits\10\lib\10.0.22000.0\um\x64"
Error: undefined reference to `_memset128ii`
        referenced from `main`
        perhaps a library needs to be added with the `-L` flag or 
`pragma(lib, ...)`
```
Dec 30 2025
next sibling parent "Richard (Rikki) Andrew Cattermole" <richard cattermole.co.nz> writes:
On 31/12/2025 12:39 PM, DLearner wrote:

 And we get: (DMD64 D Compiler v2.111.0)
 ```
 ctfemst.obj : error LNK2019: unresolved external symbol _memset128ii 
 referenced in function main
 ctfemst.exe : fatal error LNK1120: 1 unresolved externals
 Error: linker exited with status 1120
         C:\Program Files\Microsoft Visual 
 Studio\2022\Community\VC\Tools\MSVC\14.41.34120\bin\HostX64\x64\link.exe
/NOLOGO "ctfemst.obj"    /LIBPATH:"C:\Program Files\Microsoft Visual
Studio\2022\Community\VC\Tools\MSVC\14.41.34120\lib\x64"
legacy_stdio_definitions.lib /LIBPATH:"C:\Program Files (x86)\Windows
Kits\10\Lib\10.0.22000.0\ucrt\x64" /LIBPATH:"C:\Program Files (x86)\Windows
Kits\10\lib\10.0.22000.0\um\x64"
 Error: undefined reference to `_memset128ii`
         referenced from `main`
         perhaps a library needs to be added with the `-L` flag or 
 `pragma(lib, ...)`
 ```


Yeah static arrays have trouble initializing in -betterC.

But only with dmd.

https://github.com/dlang/dmd/blob/master/druntime/src/rt/memset.d#L83

https://github.com/dlang/dmd/issues/19579
Dec 30 2025
prev sibling parent Kapendev <alexandroskapretsos gmail.com> writes:
On Tuesday, 30 December 2025 at 23:39:40 UTC, DLearner wrote:

 string mxnInit(string parmScrnDef) {
 if(__ctfe) {
 ctfemst.obj : error LNK2019: unresolved external symbol 
 _memset128ii referenced in function main
 Error: undefined reference to `_memset128ii`










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Dec 30 2025