/usr/bin/ld: /tmp/cctT6s3u.o: warning: relocation against `_ZN16cmps2020_student10instructorB5cxx11E' in read-only section `.text'
/usr/bin/ld: /tmp/cctT6s3u.o: in function `main':
main1.cpp:(.text+0x52): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0x5e): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0x86): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0xae): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0xd6): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status