No uniquely matching class member, but no candidates are printed.

[ferdymercury]

Describe the bug
We get 100+ warnings of the type:

/opt/root_src/io/sql/src/TSQLFile.cxx:2668: warning: no uniquely matching class member found for 
  void TSQLFile::Streamer(TBuffer &b)

but then no "candidates" are proposed.

Expected behavior
Either the adjective "uniquely" should be removed, or the "potential candidates", if any, should be listed.

Screenshots
Log is attached: consoleText.txt.zip

To Reproduce
I couldn't yet achieve a "small" reproducer, somehow it only appears in the "big build".

Version
1.9.4 (a85850b*)

[albert-github]

You didn't provide the used Doxyfile but from the other questions I see a repeating pattern, so maybe a bit of a wild guess, have a look at:

IGNORE_PREFIX          = T
EXCLUDE_PATTERNS    = ....

[albert-github]

I assume that the normal declaration is from core/base/inc/Rtypes.h.
What are the settings for virtual_keyword and for overrd?

Might be useful you set INPUT to INPUT=io/sql/src/TSQLFile.cxx and try to run just the doxygen part as doxygen -d preprocessor.

Looking through some other issues: is there an anonymous namespace involved?

[ferdymercury]

Thanks for the hint. Attached is the preprocessor output with just the TSQLFile.cxx and .h as input.
preproc.txt.zip
It seems as if ClassDefOverride is not being expanded:

00252    void WriteStreamerInfo() final;
00253 
00254    ClassDefOverride(TSQLFile, 1) // ROOT TFile interface to SQL database
00255 };
00256 
00257 
00258 

overrd = override, and virtual_keyword is empty, because:
ClassDefOverride(TSQLFile, 1) calls (via Rtypes.h) the following:
_ClassDefOutline_(name,id,,override)
which has one empty argument (the third, i.e. the virtual_keyword), maybe that's confusing for doxygen?

This one then declares the Streamer function as:
virtual_keyword void Streamer(TBuffer&) overrd;
=>
void Streamer(TBuffer&) override;

We do see issues with anonymous namespaces in the full log, but not in this particular class, as far as I can evaluate.

Thanks again!

[ferdymercury]

Ok, I think I have found the culprit:
#include TFile.h: not found! skipping...

which means I should add this file to the include_path, too. If I do that, the warning disappears. Because this is the file that does the "include Rtypes.h" part.

However, I still think it would make more sense to remove the "uniquely" from the warning message.

[ferdymercury]

Ok, I managed to create a (small) reproducer. Here it is:
uniquely.zip

Here are the different output errors.

If I let everything as in the zip:

TSQLFile.cxx:2668: warning: no uniquely matching class member found for 
  void TSQLFile::Streamer(TBuffer &b)

If I remove Rtypes.h, the output error makes much more sense:
TSQLFile.cxx:2668: warning: documented symbol 'void TSQLFile::Streamer' was not declared or defined.

If add subfolder to the include_path in the Doxyfile, no errors are found.

[ferdymercury]

"needinfo" label can be removed? Or you need some more info from my side? Thanks!

[ferdymercury]

I just proposed a patch. #9293

With it, this is how the output looks like now. No longer empty:

/tmp/uniquely/TSQLFile.cxx:2668: warning: no uniquely matching class member found for 
  void TSQLFile::Streamer(TBuffer &b)
Possible candidates:
  'void TFile::Streamer(TBuffer &) override' at line 341 of file /tmp/uniquely/subfolder/TFile.h
  'void TDirectory::Streamer(TBuffer &) override' at line 299 of file /tmp/uniquely/TDirectory.h
  'void TDirectoryFile::Streamer(TBuffer &) override' at line 130 of file /tmp/uniquely/TDirectoryFile.h
  'virtual void TNamed::Streamer(TBuffer &)' at line 58 of file /tmp/uniquely/TNamed.h
  'virtual void TObject::Streamer(TBuffer &)' at line 230 of file /tmp/uniquely/TObject.h

[ferdymercury]

@albert-github can you add the fixed-not-released label ? Thanks!