check_cxx_source_runs("
  #include <stdarg.h>
  #include <stdio.h>

  int call_vsnprintf(const char* fmt, ...) {
    char buf[256];
    va_list ap;
    va_start(ap, fmt);
    int result = vsnprintf(buf, sizeof(buf), fmt, ap);
    va_end(ap);
    return result;
  }

  int main(int argc, char** argv) {
    return call_vsnprintf(\"%\", 1) < 0 ? 0 : 1;
  }"
  HAVE_VSNPRINTF_ERRORS
)