QMake doesn't treat source files as source files if it sees them in include

Someone probably decided to use regular expression to scan whole project and automatically exclude .c files that appear in include statement from list of compilation units. I see no reason for it, especially since it's undocumented and invisible to the end-user. The only difference is in the generated makefile.

I have a special clause in my code that allows me to submit whole project as a single compilation unit to my universitie's upload system. The system is retarded and doesn't allow students to structure their homeworks, so I use that as a workaround. For example at the end of my "arrays.h" file, there's:

#ifdef PREPROCESING_FOR_ODEVSYS
#include "arrays.c"
#endif

This ifdef is does not pass when compiling in qtcreator, but you'd need more than a regular expression to detect that. When I removed this line, the qmake immediatelly added my arrays.c to makefile.

I used this as a workaround:

#ifdef PREPROCESING_FOR_ODEVSYS
#define ARRAYS_C_QMAKE_IS_RETARDED "arrays.c"
#include ARRAYS_C_QMAKE_IS_RETARDED
#endif

This is inconsistent, undocumented behavior in qmake. It needs to be either retracted or made consistent and apparent (eg. by a warning that source file was ignored).