/usr/bin/ld: /tmp/ccEZ3iJ5.o: warning: relocation against `_ZN16cmps2020_student10instructorB5cxx11E' in read-only section `.text'
/usr/bin/ld: /tmp/ccEZ3iJ5.o: in function `main':
main1.cpp:(.text+0x55): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0x64): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0x8f): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0xba): undefined reference to `cmps2020_student::instructor[abi:cxx11]'
/usr/bin/ld: main1.cpp:(.text+0xe5): 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