GCC 7 Release Series – Changes, New Features, and Fixes. „The ARMv8.3-A architecture is now supported. It can be used by specifying the -march=armv8.3-a option. [..] The option -msign-return-address= is supported to enable return address protection using ARMv8.3-A Pointer Authentication Extensions.”
[Ping~,AArch64 Add commandline support for -march=armv8.3-a]. „pointer authentication extension is defined to be mandatory extension on ARMv8.3-A and is not optional”
