Where is `void __wprintf_buffer()` declared in include/printf.h defined?

Where is `void __wprintf_buffer()` declared in include/printf.h defined?

[张 天夫]

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In include/printf.h there is a declaration:
```C
void __wprintf_buffer (struct __wprintf_buffer *buf, const wchar_t *format,
           va_list ap, unsigned int mode_flags);
```
I can't find its definition?

Re: Where is `void __wprintf_buffer()` declared in include/printf.h defined?

[Florian Weimer]

* 张 天夫 via Libc-help:

> In include/printf.h there is a declaration:
> ```C
> void __wprintf_buffer (struct __wprintf_buffer *buf, const wchar_t *format,
>            va_list ap, unsigned int mode_flags);
> ```
> I can't find its definition?

The file stdio-common/vfwprintf-internal.c includes
stdio-common/vfprintf-internal.c after defining COMPILE_WPRINTF,
and this turns

  void
  Xprintf_buffer (struct Xprintf_buffer *buf, const CHAR_T *format,
                  va_list ap, unsigned int mode_flags)

into

  void
  __wprintf_buffer (struct __wprintf_buffer *buf, const wchar_t *format,
                    va_list ap, unsigned int mode_flags)

with the help of include/printf_buffer.h and
stdio-common/printf_buffer-wchar_t.h.

Thanks,
Florian