Does Doxygen have support for branching or for C/C++ preprocessor

Question

This might sound like a sci-fi feature request but I wonder if Doxygen has any of the two following features:

1. Generating the call/caller graphs after preprocessor ran over the input file. Example:
   

   #define MULTITHREADING 1
   

   and then blocks of code are enabled or disabled depending on whether MULTITHREADING is enabled.

2. Describing the certainty of the call with graph arrows... for example a dotted line if the function isn't always called (a.k.a it is in a branch or you have possible return before the function is called.

Answer 1

1. Doxygen Preprocessing:

   Source files that are used as input to doxygen can be parsed by doxygen's built-in C-preprocessor.

   By default doxygen does only partial preprocessing. That is, it evaluates conditional compilation statements (like #if) and evaluates macro definitions, but it does not perform macro expansion.

2. COLLABORATION_GRAPH:

   If the COLLABORATION_GRAPH and HAVE_DOT tags are set to YES then doxygen will generate a graph for each documented class showing the direct and indirect implementation dependencies (inheritance, containment, and class references variables) of the class with other documented classes.

Answer 2

For the first item, you will want to enable the ENABLE_PREPROCESSING option in your Doxyfile.

For the second, I honestly don't know, but would be very surprised if it did. I think that this would require a full C/C++ compiler to determine these things.