Re: [Mingw-users] long long int printf query

[Brian D. <br...@de...>]

Keith Marshall wrote:

> Define this ONCE, in a header...
> 
> #ifdef _WIN32
> # define LL_FMT "I64"
> #else
> # define LL_FMT "ll"
> #endif

I would be very cautious of doing this.  For one thing, appropriate
standardized macros already exist in inttypes.h as Peter's message
outlines.  But more disturbingly, _WIN32 tells something about the fact
that you're using the w32api, but not that you are necessarily using
Microsoft's C runtime.  And it's the latter fact that you want to test
for.  For example if you were writing a Cygwin application that also
used parts of w32api directly (and #includes windows.h) then _WIN32 will
be defined yet "ll" is the correct format specifier.

You see the idiom "#if defined(_WIN32) && !defined(__CYGWIN__)" all over
the place in response to this, but I think it's ugly to have to use this
when inttypes.h exists and works.

Brian