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/* We are activating __USE_MINGW_ANSI_STDIO for various define indicators.
 * printf ll modifier (unsupported by msvcrt.dll) is required by C99 and C++11 standards. */
#if (defined (_POSIX) || defined (_POSIX_SOURCE) || defined (_POSIX_C_SOURCE) \
     || defined (_ISOC99_SOURCE) \
     || (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && __MSVCRT_VERSION__ < 0xE00) \
     || (defined (__cplusplus) && __cplusplus >= 201103L && __MSVCRT_VERSION__ < 0xE00) \
     || defined (_XOPEN_SOURCE) || defined (_XOPEN_SOURCE_EXTENDED) \
     || defined (_GNU_SOURCE) \
     || defined (_SVID_SOURCE)) \
    && !defined(__USE_MINGW_ANSI_STDIO)
/* Enable __USE_MINGW_ANSI_STDIO if user did _not_ specify it explicitly... */
#  define __USE_MINGW_ANSI_STDIO			1
#endif

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/* 7.8.1 Macros for format specifiers
 * 
 * MS runtime does not yet understand C9x standard "ll"
 * length specifier. It appears to treat "ll" as "l".
 * The non-standard I64 length specifier causes warning in GCC,
 * but understood by MS runtime functions.
 */
#if defined(_UCRT) || __USE_MINGW_ANSI_STDIO
#define PRId64 "lld"
#define PRIi64 "lli"
#define PRIo64 "llo"
#define PRIu64 "llu"
#define PRIx64 "llx"
#define PRIX64 "llX"
#else
#define PRId64 "I64d"
#define PRIi64 "I64i"
#define PRIo64 "I64o"
#define PRIu64 "I64u"
#define PRIx64 "I64x"
#define PRIX64 "I64X"
#endif

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#include <stdio.h>
#include <inttypes.h>
#include <windows.h>

int wmain(int argc, wchar_t ** argv, wchar_t **env)
{
	unsigned long long a = 1337;

	wchar_t str[100];
	wsprintfW(str, L"%" PRIu64 "\n", a);
	wprintf(str); // Prints lu, not the number
	return 0;
}

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wsprintfW(str, L"%llu", a);

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#include <stdio.h>

#undef __USE_MINGW_ANSI_STDIO
#include <inttypes.h>
#include <windows.h>

int wmain(int argc, wchar_t ** argv, wchar_t **env)
{
	unsigned long long a = 1337;

	wchar_t str[100];
	wsprintfW(str, L"%" PRIu64 "\n", a);
	wprintf(str); // Prints 1337
	return 0;
}

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gcc -Wall -municode a.c

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disks_win.c:33:10: fatal error: ddk/ntdddisk.h: No such file or directory

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#if !defined(__cplusplus) || defined(__STDC_FORMAT_MACROS)

/* 7.8.1 Macros for format specifiers
 *
 * MS runtime does not yet understand C9x standard "ll"
 * length specifier. It appears to treat "ll" as "l".
 * The non-standard I64 length specifier causes warning in GCC,
 * but understood by MS runtime functions.
 */

. . .

#define PRIu64 "I64u"

. . .