Don't use CONFIG_CC_IS_GCC in the checks (it was introduced only in v4.18)

kconfig_hardened_check/__init__.py

@@ -322,8 +322,8 @@ def add_kconfig_checks(l, arch):
     # 'self_protection', 'defconfig'
     l += [KconfigCheck('self_protection', 'defconfig', 'BUG', 'y')]
     l += [KconfigCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y')]
-    l += [AND(KconfigCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y'),
-              cc_is_gcc)]
+    gcc_plugins_support_is_set = KconfigCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y')
+    l += [gcc_plugins_support_is_set]
     l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR', 'y'),
              KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR', 'y'),
              KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_REGULAR', 'y'),
@@ -396,7 +396,7 @@ def add_kconfig_checks(l, arch):
     l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_NOTIFIERS', 'y')]
     l += [KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y')]
     l += [AND(KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'),
-              cc_is_gcc)]
+              gcc_plugins_support_is_set)]
     l += [KconfigCheck('self_protection', 'kspp', 'KFENCE', 'y')]
     l += [KconfigCheck('self_protection', 'kspp', 'WERROR', 'y')]
     l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
@@ -430,7 +430,7 @@ def add_kconfig_checks(l, arch):
              # That brings higher performance penalty.
     if arch in ('X86_64', 'ARM64', 'X86_32'):
         stackleak_is_set = KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
-        l += [AND(stackleak_is_set, cc_is_gcc)]
+        l += [AND(stackleak_is_set, gcc_plugins_support_is_set)]
         l += [KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y')]
     if arch in ('X86_64', 'X86_32'):
         l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')]
@@ -468,10 +468,10 @@ def add_kconfig_checks(l, arch):
     if arch in ('X86_64', 'ARM64', 'X86_32'):
         l += [AND(KconfigCheck('self_protection', 'clipos', 'STACKLEAK_METRICS', 'is not set'),
                   stackleak_is_set,
-                  cc_is_gcc)]
+                  gcc_plugins_support_is_set)]
         l += [AND(KconfigCheck('self_protection', 'clipos', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'),
                   stackleak_is_set,
-                  cc_is_gcc)]
+                  gcc_plugins_support_is_set)]
     if arch in ('X86_64', 'X86_32'):
         l += [AND(KconfigCheck('self_protection', 'clipos', 'INTEL_IOMMU_DEFAULT_ON', 'y'),
                   iommu_support_is_set)]