Hello anda_skoa, checking the code about your comment, because it is only a transcription error.

But I tell you something very curious and strange at the same time.

All the code that I put in the first post, was only a portion of all the code that I have programmed, only for purposes of my problem I reduced to those few files.

But the curious detail is that I took only the subprojects involved in the subproject project and language, to make use of them separately and test their operation and what was the surprise, which compiled and executed everything without problems.

What I can think of is that the problem is given by the cyclical dependence I have among the subprojects, which you referred to.

Qt Code: 
  1. Com.depends = common
  2. Common.depends = com
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But at the same time it generates some noise, since in particular the project and language subprojects do not depend on the subproject com.

If you consider any other reason why this problem may occur, I would like to read your opinion.

Thanks in advance.