include-cleaner: Report function decls from __cleanup__ as used (#138669)

clang-tools-extra/include-cleaner/lib/WalkAST.cpp

@@ -321,6 +321,11 @@ public:
     return true;
   }
 
+  bool VisitCleanupAttr(CleanupAttr *attr) {
+    report(attr->getLocation(), attr->getFunctionDecl());
+    return true;
+  }
+
   // TypeLoc visitors.
   void reportType(SourceLocation RefLoc, NamedDecl *ND) {
     // Reporting explicit references to types nested inside classes can cause

clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp

@@ -570,5 +570,11 @@ TEST(WalkAST, OperatorNewDelete) {
   testWalk("struct A { static void $ambiguous^operator delete(void*); };",
            "void foo() { A a; ^delete &a; }");
 }
+
+TEST(WalkAST, CleanupAttr) {
+  testWalk("void* $explicit^freep(void *p);",
+           "void foo() { __attribute__((^__cleanup__(freep))) char* x = 0; }");
+}
+
 } // namespace
 } // namespace clang::include_cleaner