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Bug
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    Resolution: Invalid
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P3: Somewhat important
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    None
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    5.9.2, 5.10.0 Beta 1
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    None
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    OS: Linux core 4.10.0-37-generic #41~16.04.1-Ubuntu SMP x86_64 (Mint Linux 18.2)
Compiler: GCC/G++ version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
Build type: developer/shadow 
QtEnginio module produces following error while compiling:
error: zero as null pointer [-Wall-warnings-as-errors]
for files
enginioclient.h enginiomodel.h enginiooauth2authentication.h.
In the current state the entry function of these headers looks like:
explicit EnginioOAuth2Authentication(QObject *parent = 0); explicit EnginioModel(QObject *parent = 0); explicit EnginioClient(QObject *parent = 0);
and it is the source of error. After changing to:
explicit EnginioOAuth2Authentication(QObject *parent = NULL); explicit EnginioModel(QObject *parent = NULL); explicit EnginioClient(QObject *parent = NULL);
the problem disappears.