PSXE 2020 macOS: compilervars.sh currently does not support zsh.
PSXE 2020 macOS zsh: Simplest workaround is:
bash -c 'source /opt/intel/bin/compilervars.sh intel64 ; exec zsh'
Which will end up with a new zsh instance, so if you exit from the new instance you will lose the env vars.
oneAPI: setvars.sh or compiler/latest/vars.sh and other shells:
Same method as above:
# oneAPI setvars.sh use in zsh
bash -c 'source /opt/intel/oneapi/setvars.sh ; exec zsh'
# oneAPI compiler vars.sh use in zsh
bash -c 'source /opt/intel/oneapi/compiler/latest/env/vars.sh ; exec zsh'
# oneAPI setvars.sh use in csh/tcsh
bash -c 'source /opt/intel/oneapi/setvars.sh ; exec csh'
# oneAPI compiler vars.sh use in csh/tcsh
bash -c 'source /opt/intel/oneapi/compiler/latest/env/vars.sh ; exec csh'
WARNING - do not put these in your shell "rc" dot file, for example, ~/.cshrc. Your shell RC is invoked with each new shell - and notice "exec csh" in this workaround - this will start a subshell, invoke .cshrc, which execs a new shell, the new shell runs .cshrc and you get into an infinite loop.