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ld: fatal: entry point symbol `rrors' is undefined

You compiled with "-pedantic -errors" instead of "-pedantic-errors". There is no space there.

I try to link a mtm_ex1.o which is provided by the course staff and receive the following error: mtm_ex1.o: file not recognized: File format not recognized collect2: ld returned 1 exit status

A. You probably use a wrong object, for example a Windows object on Linux or vice versa. It is also possible that you use a t2 object on a 32 bit Linux (t2 is 64 bit). You should link with the object file matching your Operating System

Q. I try to link a mtm_ex1.o which is provided by the course staff and receive the following error: /usr/bin/ld: warning: i386 architecture of input file `mtm_ex1.o' is incompatible with i386:x86-64 output

A. You probably use a wrong object - a Linux 32 bit object on t2 (t2 is 64 bit). You should link with the object file matching your Operating System