Add command line switch -Z to write detailed version information

src/crashlog.cpp

@@ -508,6 +508,26 @@ char *CrashLog::FillDesyncCrashLog(char *buffer, const char *last, const DesyncE
 	return buffer;
 }
 
+/**
+ * Fill the version info log buffer.
+ * @param buffer The begin where to write at.
+ * @param last   The last position in the buffer to write to.
+ * @return the position of the \c '\0' character after the buffer.
+ */
+char *CrashLog::FillVersionInfoLog(char *buffer, const char *last) const
+{
+	buffer += seprintf(buffer, last, "*** OpenTTD Version Info Report ***\n\n");
+
+	buffer = this->LogOpenTTDVersion(buffer, last);
+	buffer = this->LogOSVersion(buffer, last);
+	buffer = this->LogCompiler(buffer, last);
+	buffer = this->LogOSVersionDetail(buffer, last);
+	buffer = this->LogLibraries(buffer, last);
+
+	buffer += seprintf(buffer, last, "*** End of OpenTTD Version Info Report ***\n");
+	return buffer;
+}
+
 /**
  * Write the crash log to a file.
  * @note On success the filename will be filled with the full path of the
@@ -705,6 +725,19 @@ bool CrashLog::MakeDesyncCrashLog(const std::string *log_in, std::string *log_ou
 	return ret;
 }
 
+/**
+ * Makes a version info log, writes it to a file. It uses DEBUG to write
+ * information like paths to the console.
+ * @return true when everything is made successfully.
+ */
+bool CrashLog::MakeVersionInfoLog() const
+{
+	char buffer[65536];
+	this->FillVersionInfoLog(buffer, lastof(buffer));
+	printf("%s\n", buffer);
+	return true;
+}
+
 /**
  * Makes a crash dump and crash savegame. It uses DEBUG to write
  * information like paths to the console.

src/crashlog.h

@@ -129,6 +129,7 @@ public:
 
 	char *FillCrashLog(char *buffer, const char *last) const;
 	char *FillDesyncCrashLog(char *buffer, const char *last, const DesyncExtraInfo &info) const;
+	char *FillVersionInfoLog(char *buffer, const char *last) const;
 	bool WriteCrashLog(const char *buffer, char *filename, const char *filename_last, const char *name = "crash", FILE **crashlog_file = nullptr) const;
 
 	/**
@@ -146,6 +147,7 @@ public:
 
 	bool MakeCrashLog() const;
 	bool MakeDesyncCrashLog(const std::string *log_in, std::string *log_out, const DesyncExtraInfo &info) const;
+	bool MakeVersionInfoLog() const;
 	bool MakeCrashSavegameAndScreenshot() const;
 
 	/**
@@ -156,6 +158,7 @@ public:
 	static void InitialiseCrashLog();
 
 	static void DesyncCrashLog(const std::string *log_in, std::string *log_out, const DesyncExtraInfo &info);
+	static void VersionInfoLog();
 
 	static void SetErrorMessage(const char *message);
 	static void AfterCrashLogCleanup();

src/openttd.cpp

@@ -231,6 +231,7 @@ static void ShowHelp()
 		"  -c config_file      = Use 'config_file' instead of 'openttd.cfg'\n"
 		"  -x                  = Do not automatically save to config file on exit\n"
 		"  -q savegame         = Write some information about the savegame and exit\n"
+		"  -Z                  = Write detailed version information and exit\n"
 		"\n",
 		lastof(buf)
 	);
@@ -649,6 +650,7 @@ static const OptionData _options[] = {
 	 GETOPT_SHORT_VALUE('K'),
 	 GETOPT_SHORT_NOVAL('h'),
 	 GETOPT_SHORT_VALUE('J'),
+	 GETOPT_SHORT_NOVAL('Z'),
 	GETOPT_END()
 };
 
@@ -804,6 +806,10 @@ int openttd_main(int argc, char *argv[])
 		case 'c': free(_config_file); _config_file = stredup(mgo.opt); break;
 		case 'x': scanner->save_config = false; break;
 		case 'J': _quit_after_days = Clamp(atoi(mgo.opt), 0, INT_MAX); break;
+		case 'Z': {
+			CrashLog::VersionInfoLog();
+			goto exit_noshutdown;
+		}
 		case 'h':
 			i = -2; // Force printing of help.
 			break;

src/os/macosx/crashlog_osx.cpp

@@ -521,3 +521,9 @@ void CDECL HandleCrash(int signum, siginfo_t *si, void *context)
 	CrashLogOSX log(CrashLogOSX::DesyncTag{});
 	log.MakeDesyncCrashLog(log_in, log_out, info);
 }
+
+/* static */ void CrashLog::VersionInfoLog()
+{
+	CrashLogOSX log(CrashLogOSX::DesyncTag{});
+	log.MakeVersionInfoLog();
+}

src/os/unix/crashlog_unix.cpp

@@ -625,3 +625,9 @@ static void CDECL HandleCrash(int signum)
 	CrashLogUnix log(CrashLogUnix::DesyncTag{});
 	log.MakeDesyncCrashLog(log_in, log_out, info);
 }
+
+/* static */ void CrashLog::VersionInfoLog()
+{
+	CrashLogUnix log(CrashLogUnix::DesyncTag{});
+	log.MakeVersionInfoLog();
+}

src/os/windows/crashlog_win.cpp

@@ -621,6 +621,12 @@ static void CDECL CustomAbort(int signal)
 	log.MakeDesyncCrashLog(log_in, log_out, info);
 }
 
+/* static */ void CrashLog::VersionInfoLog()
+{
+	CrashLogWindows log(nullptr);
+	log.MakeVersionInfoLog();
+}
+
 /* The crash log GUI */
 
 static bool _expanded;