Warning about missing item in INCLUDE_PATH

[albert-github]

Doxygen version 1.8.15 and current master (June 2, 2019)

Test case: example.zip

When having 2 include files and the second file is included inside curly brackets we can get the message like:

Include_2.h:9: warning: include file stdio.h not found, perhaps you forgot to add its directory to INCLUDE_PATH?

First include file (Include.h):

#ifndef Include_header
#define Include_header

#include <stdio.h>

namespace my_space
{
  #include <Include_2.h>
}
#endif // Include_header

Second include file Include_2.h:

#ifndef Include_2_h
#define Include_2_h

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

#include <stdio.h>

#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

#endif

some small notes:

• problem is caused by the inclusion inside the namespace
• similar problems might occur when setting __cplusplus or c_plusplus
• just adding stdio.h (in this case when detected by processing the first file (Include.h) won't work as the problem will reappear when the processing order is different.

[albert-github]

I've just pushed a proposed patch, pull request #7022

[albert-github]

Code has been integrated in master on github (please don't close the issue as this will be done at the moment of a release).

[doxygen]

This issue was previously marked 'fixed but not released', which means it should be fixed in doxygen version 1.8.16. Please verify if this is indeed the case. Reopen the issue if you think it is not fixed and please include any additional information that you think can be relevant (preferably in the form of a self-contained example).

[sparist]

I am still seeing this in 1.8.17.

Are there any workarounds?

[albert-github]

I See the issue with version 1.8.15 (the version against which the this issue was posted), but in the versions 1.8.16 and 1.8.17 I don't see the warning anymore.

@spartist

• What do You see?
• Best is to create a new issue with a reference to this issue and please attach a, small, self contained example (source+configuration file in a tar or zip) that allows us to reproduce the problem? Please don't add external links as they might not be persistent.