How to make doxygen preprocessor recurse into subdirectories?

Question

I do not get the doxygen preprocessor to recursively include files. How to do this? I made up an example consisting of two headers and a Doxygen file: ``` subdir/example.h subdir2/example_include.h Doxygen ``` This is the listing of `example.h`: ``` #include "example_include.h" typedef struct { float array[ARRAY_LENGTH * 2 - 1]; #if CONDITION == MY_FALSE char optional_char; #endif } ExampleType; ``` This is the listing of `example_include.h`: ``` #define MY_FALSE (0u) #define MY_TRUE (1u) #define CONDITION MY_TRUE #define ARRAY_LENGTH (20u) ``` My changes with regard to the default Doxygen configuration file (using Doxygen 1.8.2) are: ``` INPUT = . RECURSIVE = YES GENERATE_XML = YES MACRO_EXPANSION = YES INCLUDE_PATH = . ``` The output XML of Doxygen for `ExampleType` (file: `xml/struct_example_type.xml`) is: ``` <?xml version='1.0' encoding='UTF-8' standalone='no'?> <doxygen xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="compound.xsd" version="1.…

Accepted Answer

Have you set RECURSIVE to YES?

```
# The RECURSIVE tag can be used to turn specify whether or not subdirectories
# should be searched for input files as well. Possible values are YES and NO.
# If left blank NO is used.

RECURSIVE              = YES
```

it's in the `Doxyfile`

source

And to be clear, the default value is NO.

How to make doxygen preprocessor recurse into subdirectories?

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