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digitalmars.D.learn - Is this a compiler issue?

reply DLearner <bmqazwsx123 gmail.com> writes:
Hi

This uses DMD64 D Compiler v2.111.0, using -betterC, under 
Windows 10.

With the two commented lines in place, results are as expected.
Uncomment those two lines, even though the variable is set but 
never used,
the program fails at the link stage with reference to a missing 
'_memsetn'.

Ideas?

```
extern(C) void main() {
    import core.stdc.stdio : printf;
    import testmod : sub1 , TestStruct;

    int IntVar1 = 5;


    TestStruct[1] TS1;

    TS1[0].VarAddr = &IntVar1;
    TS1[0].VarName = "IntVar1";
    TS1[0].VarInt = 3;
//   TS1[0].VarType = 'N';


    printf("ppm_th: Entered.\n");


    printf("ppm_th: Calling sub1...\n");
    sub1(TS1);
    printf("ppm_th: Returned from sub1.\n");


    printf("ppm_th: Exiting...\n");
}
```

The module 'testmod':

```
struct TestStruct {
    void*  VarAddr;
    string VarName;
    int    VarInt;
//   char   VarType;
}


void sub1(TestStruct[] parmTestStruct) {

    import core.stdc.stdio : printf;
    printf("sub1: Entered.\n");

    int* VarAddr;
    size_t wkIdx;


    for (wkIdx = 0; wkIdx < parmTestStruct.length; wkIdx = wkIdx + 
1) {

          VarAddr = cast(int*)(parmTestStruct[wkIdx].VarAddr);

          printf("*VarAddr = %d\n", *VarAddr);
          printf("\n");
    }
    printf("sub1: Exiting...\n");
}
```
Dec 06 2025
parent reply Kapendev <alexandroskapretsos gmail.com> writes:
On Saturday, 6 December 2025 at 19:36:01 UTC, DLearner wrote:

 Hi

 This uses DMD64 D Compiler v2.111.0, using -betterC, under 
 Windows 10.

 With the two commented lines in place, results are as expected.
 Uncomment those two lines, even though the variable is set but 
 never used,
 the program fails at the link stage with reference to a missing 
 '_memsetn'.

 Ideas?


I think the problem here is the type `struct[N]` with the betterC 
flag. Try replacing `TestStruct[1] TS1;` with `TestStruct TS1;` 
and `sub1(TS1);` with `sub1((&TS1)[0 .. 1]);`, and things should 
work fine.

If I am right and you want to use a static array of structs 
without defining this function yourself, then you could 
copy-paste [this 
code](https://github.com/Kapendev/joka/blob/main/source/joka/types.d#L61) in
your project.
Dec 06 2025
parent reply Kapendev <alexandroskapretsos gmail.com> writes:
On Saturday, 6 December 2025 at 21:20:37 UTC, Kapendev wrote:

 If I am right and you want to use a static array of structs 
 without defining this function yourself, then you could 
 copy-paste [this 
 code](https://github.com/Kapendev/joka/blob/main/source/joka/types.d#L61) in
your project.


Well, the [microui-d 
version](https://github.com/Kapendev/microui-d/blob/main/source/microui.d#L209)
of this is easier to copy-paste.
Dec 06 2025
parent reply DLearner <bmqazwsx123 gmail.com> writes:
On Saturday, 6 December 2025 at 21:23:22 UTC, Kapendev wrote:

 On Saturday, 6 December 2025 at 21:20:37 UTC, Kapendev wrote:

 If I am right and you want to use a static array of structs 
 without defining this function yourself, then you could 
 copy-paste [this 
 code](https://github.com/Kapendev/joka/blob/main/source/joka/types.d#L61) in
your project.


 Well, the [microui-d 
 version](https://github.com/Kapendev/microui-d/blob/main/so
rce/microui.d#L209) of this is easier to copy-paste.


Thanks for your suggestion.



Best regards
DL
Dec 06 2025
parent Kapendev <alexandroskapretsos gmail.com> writes:
On Sunday, 7 December 2025 at 00:06:14 UTC, DLearner wrote:

 On Saturday, 6 December 2025 at 21:23:22 UTC, Kapendev wrote:

 On Saturday, 6 December 2025 at 21:20:37 UTC, Kapendev wrote:

 If I am right and you want to use a static array of structs 
 without defining this function yourself, then you could 
 copy-paste [this 
 code](https://github.com/Kapendev/joka/blob/main/source/joka/types.d#L61) in
your project.


 Well, the [microui-d 
 version](https://github.com/Kapendev/microui-d/blob/main/so
rce/microui.d#L209) of this is easier to copy-paste.


 Thanks for your suggestion.



 Best regards
 DL


Yeah, could be. My solution does not need these function.
Dec 07 2025