Massive fprintf speed difference without “-std=c99”

Question

I had been struggling for weeks with a poor-performing translator I had written. On the following simple bechmark

#include

int main()
{
    i         


        

Answer 1

Since MinGW32 3.15, compliant printf functions are available to use instead of those found in Microsoft C runtime (CRT). The new printf functions are used when compiling in strict ANSI, POSIX and/or C99 modes.

For more information see the mingw32 changelog

You can use __msvcrt_fprintf() to use the fast (non compliant) function.