Exam Rank 05, segfault with same main, depending on its location

[Ariouz]

On Exam Rank 05, last exercice, the program (the -o final one) fails with no error in trace file (except missing lines from the output).
This lead me testing with the main (provided in .system/grading/main.cpp) and copying it to my rendu/cpp_module02 directory.
I used the same command line to compile it and it works like a charm with no error.
However, when i compile with the same main code, but with the main located in .system/grading directory, it compiles well but throw a segfault with no reason.
Both main.cpp (cpp_module02 and .system/grading) contain the same code.