Mingw-w64 - printf does not work - c++

Question

First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested!
I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.
#include <SDL.h>
#include "cmdutils.h"
const char program_name[] = "hello";
const int program_birth_year = 2013;
void show_help_default(const char *opt, const char *arg)
{
printf("zxcvbnm\n");
}
int main(int argc, char **argv)
{
printf("1234567890\n");
return 0;
}
And after that I created real hello world app with MinGW-w64 and qmake without eny extra libs. And its printf does not work.
I want to prevent this behavior.
I want to make printf working in traditional manner.
How I build FFmpeg:
PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
./configure \
--prefix=/home/developer/workspace/MinGW32fs \
--extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
--extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
--arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- \
--pkg-config=pkg-config --enable-libtheora --enable-libvorbis --enable-libvpx \
--enable-outdev=sdl --enable-shared --disable-static \
--disable-doc --disable-manpages --disable-podpages
make

Answer 1

Solved!
By some reason you must visibly specify you make console app.
In qmake helloworld:
CONFIG += console
In FFmpeg's configure script it's an extra-ldflag console:
PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
./configure \
--prefix=/home/developer/workspace/MinGW32fs \
--extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib -Wl,-subsystem,console" \
--extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
--arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- \
--pkg-config=pkg-config --enable-libtheora --enable-libvorbis --enable-libvpx \
--enable-outdev=sdl --enable-shared --disable-static \
--disable-doc --disable-manpages --disable-podpages