Require GCC for the GCC plugins (part II)

Require GCC for the GCC plugins (part II)

The current result on arm64_full_hardened_5.17_clang.config (clang 12):

[+] Special report mode: show_fail
[+] Kconfig file to check: my/arm64_full_hardened_5.17_clang.config
[+] Detected architecture: ARM64
[+] Detected kernel version: 5.17
=========================================================================================================================
              option name               | type  |desired val | decision |      reason      | check result
=========================================================================================================================
CONFIG_GCC_PLUGINS                      |kconfig|     y      |defconfig | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_STACKPROTECTOR_PER_TASK          |kconfig|     y      |defconfig | self_protection  | FAIL: not found
CONFIG_FORTIFY_SOURCE                   |kconfig|     y      |   kspp   | self_protection  | FAIL: not found
CONFIG_GCC_PLUGIN_LATENT_ENTROPY        |kconfig|     y      |   kspp   | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_ZERO_CALL_USED_REGS              |kconfig|     y      |   kspp   | self_protection  | FAIL: not found
CONFIG_GCC_PLUGIN_RANDSTRUCT            |kconfig|     y      |   kspp   | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_GCC_PLUGIN_STACKLEAK             |kconfig|     y      |   kspp   | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE|kconfig| is not set |  clipos  | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_STACKLEAK_METRICS                |kconfig| is not set |  clipos  | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"
CONFIG_STACKLEAK_RUNTIME_DISABLE        |kconfig| is not set |  clipos  | self_protection  | FAIL: CONFIG_CC_IS_GCC not "y"

CONFIG_STACKPROTECTOR_PER_TASK, CONFIG_FORTIFY_SOURCE and CONFIG_ZERO_CALL_USED_REGS
will be supported for clang in future (WIP).