bitcoin: Make wrapper not require -m

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9abbf958..f9934bb5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -292,7 +292,7 @@ if(BUILD_BITCOIN_BIN)
   add_executable(bitcoin bitcoin.cpp)
   add_windows_resources(bitcoin bitcoin-res.rc)
   add_windows_application_manifest(bitcoin)
-  target_link_libraries(bitcoin core_interface bitcoin_util)
+  target_link_libraries(bitcoin core_interface bitcoin_common bitcoin_util)
   install_binary_component(bitcoin HAS_MANPAGE)
 endif()
 
diff --git a/src/bitcoin.cpp b/src/bitcoin.cpp
index c3278274..c1a5fce3 100644
--- a/src/bitcoin.cpp
+++ b/src/bitcoin.cpp
@@ -5,6 +5,7 @@
 #include <bitcoin-build-config.h> // IWYU pragma: keep
 
 #include <clientversion.h>
+#include <common/args.h>
 #include <util/fs.h>
 #include <util/exec.h>
 #include <util/strencodings.h>
@@ -47,7 +48,7 @@ Run '%s help' to see additional commands (e.g. for testing and debugging).
 )";
 
 struct CommandLine {
-    bool use_multiprocess{false};
+    std::optional<bool> use_multiprocess;
     bool show_version{false};
     bool show_help{false};
     std::string_view command;
@@ -55,6 +56,7 @@ struct CommandLine {
 };
 
 CommandLine ParseCommandLine(int argc, char* argv[]);
+bool UseMultiprocess(const CommandLine& cmd);
 static void ExecCommand(const std::vector<const char*>& args, std::string_view argv0);
 
 int main(int argc, char* argv[])
@@ -78,9 +80,9 @@ int main(int argc, char* argv[])
                 return EXIT_FAILURE;
             }
         } else if (cmd.command == "gui") {
-            args.emplace_back(cmd.use_multiprocess ? "bitcoin-gui" : "bitcoin-qt");
+            args.emplace_back(UseMultiprocess(cmd) ? "bitcoin-gui" : "bitcoin-qt");
         } else if (cmd.command == "node") {
-            args.emplace_back(cmd.use_multiprocess ? "bitcoin-node" : "bitcoind");
+            args.emplace_back(UseMultiprocess(cmd) ? "bitcoin-node" : "bitcoind");
         } else if (cmd.command == "rpc") {
             args.emplace_back("bitcoin-cli");
             // Since "bitcoin rpc" is a new interface that doesn't need to be
@@ -143,6 +145,30 @@ CommandLine ParseCommandLine(int argc, char* argv[])
     return cmd;
 }
 
+bool UseMultiprocess(const CommandLine& cmd)
+{
+    // If -m or -M options were explicitly specified, there is no need to
+    // further parse arguments to determine which to use.
+    if (cmd.use_multiprocess) return *cmd.use_multiprocess;
+
+    ArgsManager args;
+    args.SetDefaultFlags(ArgsManager::ALLOW_ANY);
+    std::string error_message;
+    auto argv{cmd.args};
+    argv.insert(argv.begin(), nullptr);
+    if (!args.ParseParameters(argv.size(), argv.data(), error_message)) {
+        tfm::format(std::cerr, "Warning: failed to parse subcommand command line options: %s\n", error_message);
+    }
+    if (!args.ReadConfigFiles(error_message, true)) {
+        tfm::format(std::cerr, "Warning: failed to parse subcommand config: %s\n", error_message);
+    }
+    args.SelectConfigNetwork(args.GetChainTypeString());
+
+    // If any -ipc* options are set these need to be processed by a
+    // multiprocess-capable binary.
+    return args.IsArgSet("-ipcbind") || args.IsArgSet("-ipcconnect") || args.IsArgSet("-ipcfd");
+}
+
 //! Execute the specified bitcoind, bitcoin-qt or other command line in `args`
 //! using src, bin and libexec directory paths relative to this executable, where
 //! the path to this executable is specified in `wrapper_argv0`.
diff --git a/src/common/args.cpp b/src/common/args.cpp
index ff30ec5b..d44cd431 100644
--- a/src/common/args.cpp
+++ b/src/common/args.cpp
@@ -266,7 +266,13 @@ std::optional<unsigned int> ArgsManager::GetArgFlags(const std::string& name) co
             return search->second.m_flags;
         }
     }
-    return std::nullopt;
+    return m_default_flags;
+}
+
+void ArgsManager::SetDefaultFlags(std::optional<unsigned int> flags)
+{
+    LOCK(cs_args);
+    m_default_flags = flags;
 }
 
 fs::path ArgsManager::GetPathArg(std::string arg, const fs::path& default_value) const
diff --git a/src/common/args.h b/src/common/args.h
index da19cbda..d907ad76 100644
--- a/src/common/args.h
+++ b/src/common/args.h
@@ -137,6 +137,7 @@ protected:
     std::string m_network GUARDED_BY(cs_args);
     std::set<std::string> m_network_only_args GUARDED_BY(cs_args);
     std::map<OptionsCategory, std::map<std::string, Arg>> m_available_args GUARDED_BY(cs_args);
+    std::optional<unsigned int> m_default_flags GUARDED_BY(cs_args){};
     bool m_accept_any_command GUARDED_BY(cs_args){true};
     std::list<SectionInfo> m_config_sections GUARDED_BY(cs_args);
     std::optional<fs::path> m_config_path GUARDED_BY(cs_args);
@@ -375,10 +376,15 @@ protected:
 
     /**
      * Return Flags for known arg.
-     * Return nullopt for unknown arg.
+     * Return default flags for unknown arg.
      */
     std::optional<unsigned int> GetArgFlags(const std::string& name) const;
 
+    /**
+     * Set default flags to return for an unknown arg.
+     */
+    void SetDefaultFlags(std::optional<unsigned int>);
+
     /**
      * Get settings file path, or return false if read-write settings were
      * disabled with -nosettings.
diff --git a/test/functional/tool_bitcoin.py b/test/functional/tool_bitcoin.py
index dcfdb2d7..1112e02e 100755
--- a/test/functional/tool_bitcoin.py
+++ b/test/functional/tool_bitcoin.py
@@ -7,7 +7,10 @@ from test_framework.test_framework import (
     BitcoinTestFramework,
     SkipTest,
 )
-from test_framework.util import assert_equal
+from test_framework.util import (
+    append_config,
+    assert_equal,
+)
 
 import platform
 import re
@@ -55,12 +58,11 @@ class ToolBitcoinTest(BitcoinTestFramework):
                 raise RuntimeError(f"Unexpected output from {node.args + extra_args}: {out=!r} {err=!r} {ret=!r}") from e
 
     def run_test(self):
+        node = self.nodes[0]
+
         self.log.info("Ensure bitcoin node command invokes bitcoind by default")
         self.test_args([], [], expect_exe="bitcoind")
 
-        self.log.info("Ensure bitcoin command does not accept -ipcbind by default")
-        self.test_args(["-M"], ["-ipcbind=unix"], expect_error='Error: Error parsing command line arguments: Invalid parameter -ipcbind=unix')
-
         self.log.info("Ensure bitcoin -M invokes bitcoind")
         self.test_args(["-M"], [], expect_exe="bitcoind")
 
@@ -74,6 +76,13 @@ class ToolBitcoinTest(BitcoinTestFramework):
             self.log.info("Ensure bitcoin -m does accept -ipcbind")
             self.test_args(["-m"], ["-ipcbind=unix"], expect_exe="bitcoin-node")
 
+            self.log.info("Ensure bitcoin accepts -ipcbind by default")
+            self.test_args([], ["-ipcbind=unix"], expect_exe="bitcoin-node")
+
+            self.log.info("Ensure bitcoin recognizes -ipcbind in config file")
+            append_config(node.datadir_path, ["ipcbind=unix"])
+            self.test_args([], [], expect_exe="bitcoin-node")
+
 
 def get_node_output(node):
     ret = node.process.wait(timeout=60)
diff --git a/test/lint/check-doc.py b/test/lint/check-doc.py
index 3e9e5ba2..e47ff30f 100755
--- a/test/lint/check-doc.py
+++ b/test/lint/check-doc.py
@@ -23,7 +23,7 @@ CMD_GREP_WALLET_ARGS = r"git grep --function-context 'void WalletInit::AddWallet
 CMD_GREP_WALLET_HIDDEN_ARGS = r"git grep --function-context 'void DummyWalletInit::AddWalletOptions' -- {}".format(CMD_ROOT_DIR)
 CMD_GREP_DOCS = r"git grep --perl-regexp '{}' {}".format(REGEX_DOC, CMD_ROOT_DIR)
 # list unsupported, deprecated and duplicate args as they need no documentation
-SET_DOC_OPTIONAL = set(['-h', '-?', '-dbcrashratio', '-forcecompactdb'])
+SET_DOC_OPTIONAL = set(['-h', '-?', '-dbcrashratio', '-forcecompactdb', '-ipcconnect', '-ipcfd'])
 
 
 def lint_missing_argument_documentation():