[Issue 22767] New: C-style variadic functions assume __va_list_tag is imported

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22767

          Issue ID: 22767
           Summary: C-style variadic functions assume __va_list_tag is
                    imported
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: duser at airmail.cc

// test.d
void fn(int x, ...) {}

output: "test.d(1): Error: `__va_list_tag` is not defined, perhaps `import
core.stdc.stdarg;` ?"

it gives the error on 64-bit linux but compiles successfully on windows (either
bitness) and 32-bit linux

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