https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #1 from dave287091@gmail.com ---
The D version also seg faults, so maybe D’s implementation of stdarg is buggy?

import core.stdc.stdarg;
import core.stdc.stdio;

void printf10(const(char)* fmt, ...){
    for(int i = 0; i < 10; i++){
        va_list args;
        va_start(args, fmt);
        vprintf(fmt, args);
        va_end(args);
    }
}

int main(){
    printf10("Hello %s\n".ptr, "world".ptr);
    return 0;
}

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https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #2 from dave287091@gmail.com ---
(In reply to dave287091 from comment #1)
> The D version also seg faults, so maybe D’s implementation of stdarg is buggy?
> 
> import core.stdc.stdarg;
> import core.stdc.stdio;
> 
> void printf10(const(char)* fmt, ...){
>     for(int i = 0; i < 10; i++){
>         va_list args;
>         va_start(args, fmt);
>         vprintf(fmt, args);
>         va_end(args);
>     }
> }
> 
> int main(){
>     printf10("Hello %s\n".ptr, "world".ptr);
>     return 0;
> }

Forgot the extern(C) on printf10, but it still is buggy:

$ ./vap
Hello world
Hello
Segmentation fault: 11

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https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #3 from dave287091@gmail.com ---
It works with ldc (which probably just defers to the llvm intrinsic) so the dmd implementation of stdarg is wrong. This is not actually ImportC specific.

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https://issues.dlang.org/show_bug.cgi?id=23409

Iain Buclaw <ibuclaw@gdcproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P1                          |P3

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https://issues.dlang.org/show_bug.cgi?id=23409

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com

--- Comment #4 from Walter Bright <bugzilla@digitalmars.com> ---
The problem probably has to do with putting va_start and va_end in a loop. I think it was written expecting it to be done only once.

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https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #5 from dave287091@gmail.com ---
(In reply to Walter Bright from comment #4)
> The problem probably has to do with putting va_start and va_end in a loop. I think it was written expecting it to be done only once.

The same problem occurs with manually unrolling the loop.

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https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #6 from Walter Bright <bugzilla@digitalmars.com> ---
ImportC uses the D implementation of va_list, so your deduction that the fault lies with the D implementation is most likely correct.

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https://issues.dlang.org/show_bug.cgi?id=23409

Tim <tim.dlang@t-online.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tim.dlang@t-online.de
           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=21425

--- Comment #7 from Tim <tim.dlang@t-online.de> ---
Here is a related issue for normal D: https://issues.dlang.org/show_bug.cgi?id=21425

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https://issues.dlang.org/show_bug.cgi?id=23409

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #8 from Walter Bright <bugzilla@digitalmars.com> ---


*** This issue has been marked as a duplicate of issue 21425 ***

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