Re: [Tinycc-devel] x86_64: second struct va_arg fails

[grischka]

Henry Kroll wrote:
> x86_64 fails to copy the second struct passed to va_arg.
>
> static struct myspace {
>     short int profile;
> } bob = { 42 };
>
> void badfunc(int eek, ...) {
>     va_list ack;
>     int validate;
>     struct myspace george, bill;
>     va_start(ack, eek);
>         bill     = va_arg(ack, struct myspace);
>         george   = va_arg(ack, struct myspace);
>         validate = va_arg(ack, int);
> [...]
> int main(int argc, char **argv) {
>     badfunc(0, bob, bob, bob.profile);
> [...]

This line from tcc's include/stdarg.h might give a hint:
    /* XXX: this lacks the support of aggregated types. */                  \

I have no idea though how such support would look like.

Btw. on win64 it does not work either.  I must have misunderstood
something about the structures part of the calling conventions.

--- grischka