build: fix some compiler warnings

lib/message/mu-contact.hh

@@ -129,6 +129,8 @@ struct Contact {
 	 * @return the field-id or Nothing.
 	 */
 	constexpr Option<Field::Id> field_id() const noexcept {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wswitch-enum"
 		switch(type) {
 		case Type::Bcc:
 			return Field::Id::Bcc;
@@ -141,6 +143,7 @@ struct Contact {
 		default:
 			return Nothing;
 		}
+#pragma GCC diagnostic pop
 	}
 
 
@@ -167,6 +170,8 @@ private:
 constexpr Option<Contact::Type>
 contact_type_from_field_id(Field::Id id) noexcept {
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wswitch-enum"
 	switch(id) {
 	case Field::Id::Bcc:
 		return Contact::Type::Bcc;
@@ -179,6 +184,7 @@ contact_type_from_field_id(Field::Id id) noexcept {
 	default:
 		return Nothing;
 	}
+#pragma GCC diagnostic pop
 }
 
 using Contacts = std::vector<Contact>;

lib/message/mu-message.cc

@@ -490,6 +490,9 @@ handle_object(const MimeObject& parent,
 		info.flags |= Flags::Encrypted;
 	} else if (obj.is_mime_application_pkcs7_mime()) {
 		MimeApplicationPkcs7Mime smime(obj);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wswitch-enum"
+		// CompressedData, CertsOnly, Unknown
 		switch (smime.smime_type()) {
 		case Mu::MimeApplicationPkcs7Mime::SecureMimeType::SignedData:
 			info.flags |= Flags::Signed;
@@ -500,6 +503,7 @@ handle_object(const MimeObject& parent,
 		default:
 			break;
 		}
+#pragma GCC diagnostic pop
 	}
 }
 
@@ -718,6 +722,7 @@ fill_document(Message::Private& priv)
 			break;
 		/* LCOV_EXCL_START */
 		case Field::Id::_count_:
+		default:
 			break;
 		/* LCOV_EXCL_STOP */
 		}

lib/message/mu-mime-object.cc

@@ -331,6 +331,7 @@ address_type(Contact::Type ctype)
 		return GMIME_ADDRESS_TYPE_REPLY_TO;
 	case Contact::Type::Sender:
 		return GMIME_ADDRESS_TYPE_SENDER;
+	case Contact::Type::None:
 	default:
 		return Nothing;
 	}

lib/mu-maildir.hh

@@ -71,18 +71,6 @@ Result<void> maildir_link(const std::string& src, const std::string& targetpath)
  */
 Result<void> maildir_clear_links(const std::string& dir);
 
-/**
- * get the maildir for a certain message path, ie, the path *before*
- * cur/ or new/ and *after* the root.
- *
- * @param path path for some message
- * @param root filesystem root for the maildir
- *
- * @return the maildir or an Error
- */
-Result<std::string> maildir_from_path(const std::string& path,
-				      const std::string& root);
-
 /**
  * Move a message file to another maildir. If the target file already exists, it
  * is overwritten.

lib/mu-parser.cc

@@ -96,6 +96,8 @@ process_value(const std::string& field, const std::string& value)
 {
 	const auto id_opt{field_from_name(field)};
 	if (id_opt) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wswitch-enum"
 		switch (id_opt->id) {
 		case Field::Id::Priority: {
 			if (!value.empty())
@@ -108,6 +110,7 @@ process_value(const std::string& field, const std::string& value)
 		default:
 			break;
 		}
+#pragma GCC diagnostic pop
 	}
 
 	return value; // XXX prio/flags, etc. alias

lib/utils/mu-sexp.hh

@@ -415,6 +415,9 @@ operator<<(std::ostream& os, Sexp::Type id)
 	case Sexp::Type::Symbol:
 		os << "symbol";
 		break;
+	case Sexp::Type::Raw:
+		os << "raw";
+		break;
 	case Sexp::Type::Empty:
 		os << "empty";
 		break;

lib/utils/mu-utils.cc

@@ -50,8 +50,6 @@
 #include "mu-error.hh"
 #include "mu-option.hh"
 
-#include "message/mu-message-file.hh"
-
 using namespace Mu;
 
 namespace {