fix: support GCC flags in clang-tidy 22

Author: ngallodev

Makefile.cbm

@@ -1104,6 +1104,7 @@ clean-c:
 # Pinned lint toolchain; callers may override either binary explicitly.
 CLANG_TIDY ?= clang-tidy-22
 CLANG_FORMAT ?= clang-format-20
+CLANG_TIDY_FLAGS ?= -Wno-unknown-warning-option
 CPPCHECK ?= cppcheck
 # Cppcheck is the long pole in the CI lint gate. Its own worker pool is safer
 # than partitioning LINT_SRCS across separate invocations because diagnostics,
@@ -1125,13 +1126,13 @@ LINT_TEST_SRCS = $(ALL_TEST_SRCS)
 # clang-tidy: deep static analysis (config in .clang-tidy)
 lint-tidy:
 	@echo "=== clang-tidy ==="
-	@$(CLANG_TIDY) --quiet $(LINT_SRCS) -- $(CFLAGS_COMMON) $(SYSROOT_FLAG)
+	@$(CLANG_TIDY) --quiet $(LINT_SRCS) -- $(CFLAGS_COMMON) $(CLANG_TIDY_FLAGS) $(SYSROOT_FLAG)
 
 # clang-tidy, scoped to this commit's staged changes only (scripts/lint-tidy-diff.sh).
 # The pre-commit hook runs this instead of the full lint-tidy sweep above, so a
 # clean commit is not blocked by pre-existing findings elsewhere in the tree.
 lint-tidy-diff:
-	@scripts/lint-tidy-diff.sh "$(CLANG_TIDY)" $(LINT_SRCS) -- $(CFLAGS_COMMON) $(SYSROOT_FLAG)
+	@scripts/lint-tidy-diff.sh "$(CLANG_TIDY)" $(LINT_SRCS) -- $(CFLAGS_COMMON) $(CLANG_TIDY_FLAGS) $(SYSROOT_FLAG)
 
 # cppcheck: complementary analysis (config in .cppcheck)
 lint-cppcheck: