Below is a sample program that demonstrates that the GetCommandLine
function is not returning the command line arguments.  I attached
cygcheck.out.

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

int WINAPI
WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw) {
        char* text = GetCommandLine();
        printf("getcmdline: %s\n", text);
        return 0;
}

gcc test_wmain.c -o test

$ ./test hello world
getcmdline: "C:\cygwin64\home\mbarry\game-repos\greenbeam\src\test.exe"