src: add and fix some preprocessor comments

src/allocated_buffer.h

@@ -68,6 +68,6 @@ struct AllocatedBuffer {
 
 }  // namespace node
 
-#endif  // NODE_WANT_INTERNALS
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #endif  // SRC_ALLOCATED_BUFFER_H_

src/api/exceptions.cc

@@ -237,7 +237,7 @@ Local<Value> WinapiErrnoException(Isolate* isolate,
 
   return e;
 }
-#endif
+#endif  // _WIN32
 
 // Implement the legacy name exposed in node.h. This has not been in fact
 // fatal any more, as the user can handle the exception in the

src/crypto/crypto_tls.cc

@@ -1474,7 +1474,7 @@ unsigned int TLSWrap::PskClientCallback(
   return psk_buf.length();
 }
 
-#endif
+#endif  // ifndef OPENSSL_NO_PSK
 
 void TLSWrap::GetWriteQueueSize(const FunctionCallbackInfo<Value>& info) {
   TLSWrap* wrap;

src/node.cc

@@ -953,7 +953,7 @@ int InitializeNodeWithArgs(std::vector<std::string>* argv,
   }
 # endif
 
-#endif
+#endif  // defined(NODE_HAVE_I18N_SUPPORT)
 
   NativeModuleEnv::InitializeCodeCache();
 
@@ -1084,7 +1084,7 @@ InitializationResult InitializeOncePerProcess(
         return result;
       }
     }
-#else
+#else  // OPENSSL_VERSION_MAJOR < 3
     if (FIPS_mode()) {
       OPENSSL_init();
     }

src/node_internals.h

@@ -283,7 +283,7 @@ class ThreadPoolWork {
 
 #if defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
 #define NODE_IMPLEMENTS_POSIX_CREDENTIALS 1
-#endif  // __POSIX__ && !defined(__ANDROID__) && !defined(__CloudABI__)
+#endif  // defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
 
 namespace credentials {
 bool SafeGetenv(const char* key, std::string* text, Environment* env = nullptr);

src/node_native_module.cc

@@ -90,7 +90,7 @@ void NativeModuleLoader::InitializeModuleCategories() {
 
 #if !NODE_USE_V8_PLATFORM || !defined(NODE_HAVE_I18N_SUPPORT)
       "trace_events",
-#endif  // !NODE_USE_V8_PLATFORM
+#endif  // !NODE_USE_V8_PLATFORM || !defined(NODE_HAVE_I18N_SUPPORT)
 
 #if !HAVE_OPENSSL
       "crypto",

src/node_options.cc

@@ -83,7 +83,8 @@ void PerProcessOptions::CheckOptions(std::vector<std::string>* errors) {
     if ((secure_heap_min & (secure_heap_min - 1)) != 0)
       errors->push_back("--secure-heap-min must be a power of 2");
   }
-#endif
+#endif  // HAVE_OPENSSL
+
   if (use_largepages != "off" &&
       use_largepages != "on" &&
       use_largepages != "silent") {
@@ -816,7 +817,7 @@ PerProcessOptionsParser::PerProcessOptionsParser(
             "minimum allocation size from the OpenSSL secure heap",
             &PerProcessOptions::secure_heap_min,
             kAllowedInEnvironment);
-#endif
+#endif  // HAVE_OPENSSL
 #if OPENSSL_VERSION_MAJOR >= 3
   AddOption("--openssl-legacy-provider",
             "enable OpenSSL 3.0 legacy provider",

src/node_report.cc

@@ -687,7 +687,7 @@ static void PrintResourceUsage(JSONWriter* writer) {
     writer->json_objectend();
     writer->json_objectend();
   }
-#endif
+#endif  // RUSAGE_THREAD
 }
 
 // Report operating system information.

src/node_sockaddr-inl.h

@@ -262,5 +262,5 @@ v8::MaybeLocal<v8::Value> SocketAddressBlockList::Rule::ToV8String(
 }
 }  // namespace node
 
-#endif  // NODE_WANT_INTERNALS
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 #endif  // SRC_NODE_SOCKADDR_INL_H_

src/node_sockaddr.h

@@ -400,6 +400,6 @@ class SocketAddressBlockListWrap : public BaseObject {
 
 }  // namespace node
 
-#endif  // NOE_WANT_INTERNALS
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #endif  // SRC_NODE_SOCKADDR_H_

src/node_url.cc

@@ -331,7 +331,7 @@ bool ToASCII(const std::string& input, std::string* output) {
   output->assign(*buf, buf.length());
   return true;
 }
-#else
+#else  // !defined(NODE_HAVE_I18N_SUPPORT)
 // Intentional non-ops if ICU is not present.
 bool ToUnicode(const std::string& input, std::string* output) {
   *output = input;
@@ -342,7 +342,7 @@ bool ToASCII(const std::string& input, std::string* output) {
   *output = input;
   return true;
 }
-#endif
+#endif  // !defined(NODE_HAVE_I18N_SUPPORT)
 
 #define NS_IN6ADDRSZ 16
 

src/node_worker.cc

@@ -497,7 +497,7 @@ void Worker::New(const FunctionCallbackInfo<Value>& args) {
         return;
       }
     }
-#endif
+#endif  // NODE_WITHOUT_NODE_OPTIONS
   }
 
   if (args[2]->IsArray()) {

src/stream_pipe.h

@@ -72,6 +72,6 @@ class StreamPipe : public AsyncWrap {
 
 }  // namespace node
 
-#endif
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #endif  // SRC_STREAM_PIPE_H_