use flags that are meaningful to that
file.  Any application that links in that file will get the flags, and
the gflags library will automatically handle that
flag appropriately.</p>

<p>There's significant gain in flexibility, and ease of code reuse,
due to this technique.  However, there is a danger that two files will
define the same flag, and then give an error when they're linked
together.</p>

<p>The rest of this document describes how to use the commandlineflag
library.  It's a C++ library, so exampl