Bug#451707: gdc-4.1: gdc is confused by variadic arguments in (C) mode

[Pierre Habouzit <madcoder@debian.org>]

Package: gdc-4.1
Version: 0.25-4.1.2-17
Severity: grave
Justification: renders package unusable

The following code triggers the issue:

--------------------------------------------------
import std.c.process;
int main(char args[][]) {
    execl("/bin/sh", "sh", "-c", "ls", null);
    printf("%m\n");
    return -1;
}
--------------------------------------------------

It seems to be related to the fact that execl prototype is:

extern(C) int exelc(char *, char *, ...) because if I do that:

--------------------------------------------------
extern(C) int execl(char *path, char *arg, char*, char*, char*, ...);
int main(char args[][]) {
    execl("/bin/sh", "sh", "-c", "ls", null);
    printf("%m\n");
    return -1;
}
--------------------------------------------------

The code works. Moreover, the execl in the first case fails with a `Bad
Address` error (probably EFAULT).

This is really nasty and makes the use of many POSIX functions totally
impossible.