| Issue |
86057
|
| Summary |
[x86_32][clang] Empty structure argument are ignored in function variable arguments.
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
CoTinker
|
demo.cpp
```
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct S2210 {} ;
struct S2210 s2210;
void check2210va (int z, ...) {
struct S2210 arg;
va_list ap;
__builtin_va_start(ap, z);
arg = __builtin_va_arg(ap, struct S2210);
long double a = __builtin_va_arg(ap, long double);
printf("%Lf\n", a);
if (a != 2.0L)
printf("Fail\n");
__builtin_va_end(ap);
}
int main (void) {
check2210va (2, s2210, 2.0L);
}
```
compile command:
```
% clang++ demo.cpp -m32
% ./a.out
```
clang:
```
0.000000
Fail
```
gcc:
```
2.000000
```
https://godbolt.org/z/EqWa5nq13
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