The "%a" specifier is new in C99, and it is supposed to print the
floating-point number in hexadecimal form.
The __mingw_printf function does recognize "%a", and when compiled
with -D__USE_MINGW_ANSI_STDIO,
no warning is fired, so I guess it is supported.
The problem is, this function seems to fail to handle whole numbers.
For example, this code snippet
printf("%a\n", 1.0);
outputs "0x0p-63" instead of "0x1.000000p+0" when compiled with the
-D__USE_MINGW_ANSI_STDIO option.
(Testing using "x86_64-posix-seh-rev0, Built by MinGW-W64 project")
I believe this is a bug in the library code.
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