fpp filenames

This tool writes out the names of XML and C++ files generated from FPP source files.

Input: A list fl of files: either the single file stdin or a list of files specified on the command line.

Output: The names of the XML and C++ files that would be generated by running fpp-to-xml and fpp-to-cpp on these files and importing their dependencies.

Procedure:

1. Parse each of the files in fl, generating a list tul of translation units. When parsing, recursively resolve include specifiers.

2. Walk the AST and identify the definitions that cause XML or C++ files to be generated.

3. Write out the names of the generated files.