Hi there!

I guess I've found something that pretty much looks like a bug to me. Or maybe you can tell me whatever I did wrong. The error occurs when I try to parse a C++-header file containing some #define and #ifdef preprocessor directives.

This is a very basic setting which already causes the error to occur:

================================================
VectorTest.hh:

// TEST is not defined -> no output:
#ifdef TEST
 // Output 1
#endif

// Define TEST
#define TEST

// TEST is now defined but there will still be no output
#ifdef TEST
  // Output 2
#endif

// Define it once again
#define TEST

// Now it will work:
#ifdef TEST
  // Output 3
#endif
================================================

I made sure that ENABLE_PREPROCESSING as well as MACRO_EXPANSION (which should not have any influence here) are set to YES. If I run doxygen with -d Preprocessor, it will dump the following output when parsing the file specified above:

================================================
00001 
00002 // TEST is not defined -> no output:
00003 
00004 
00005 
00006 
00007 
00008 // Define TEST
00009 
00010 
00011 
00012 // TEST is now defined but there will still be no output
00013 
00014 
00015 
00016 
00017 // Define it once again
00018 
00019 #define TEST
00020 
00021 // Now it will work:
00022 
00023   // Output 3
00024 
00025 
================================================

It looks like the #ifdef in line 3 already affects the preprocessor in a way that two #defines will be necessary to correctly define TEST. If I remove the #ifdef branch that encapsulates "// Output 1" it works as expected.

I'm using doxygen 1.7.1. (source package).

I appreciate your help.

Regards,

Mike