cmake HAVE___INT64 examples

fluent/fluent-bit lib/jansson-e23f558/CMakeLists.txt :200 

elseif (HAVE___INT64)

JulNadeauCA/libagar CMakeChecks.cmake :3278 

check_c_source_compiles("
#include <sys/types.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
	__int64 i64 = 0;
	printf(\"%lld\", (long long)i64);
	return (i64 != 0);
}
" HAVE___INT64)

Froser/gamemachine src/3rdparty/openal-soft-1.19.1/CMakeLists.txt :732 

CHECK_C_SOURCE_COMPILES("#define _WIN32_WINNT 0x0502
                                 #include <windows.h>
                                 __int64 foo;
                                 int main() {return 0;}" HAVE___INT64)