Messages could land in different files

Messages about the devUsage should all be written by means of the same set of routines (otherwise they might land in different files upon redirection of the output)

Author: albert-github

src/doxygen.cpp

@@ -11189,9 +11189,9 @@ static void devUsage()
   msg("  -b          making messages output unbuffered\n");
   msg("  -c <file>   process input file as a comment block and produce HTML output\n");
 #if ENABLE_TRACING
-  msg("  -t        [<file|stdout|stderr>] trace debug info to file, stdout, or stderr (default file stdout)\n");
-  msg("  -t_time   [<file|stdout|stderr>] trace debug info to file, stdout, or stderr (default file stdout),\n"
-      "                                   and include time and thread information\n");
+  msg("  -t          [<file|stdout|stderr>] trace debug info to file, stdout, or stderr (default file stdout)\n");
+  msg("  -t_time     [<file|stdout|stderr>] trace debug info to file, stdout, or stderr (default file stdout),\n"
+      "                                     and include time and thread information\n");
 #endif
   msg("  -d <level>  enable a debug level, such as (multiple invocations of -d are possible):\n");
   Debug::printFlags();
@@ -11476,7 +11476,7 @@ void readConfiguration(int argc, char **argv)
       case 'c':
         if (optInd+1>=argc) // no file name given
         {
-          err("option \"-c\" is missing the file name to read\n");
+          msg("option \"-c\" is missing the file name to read\n");
           devUsage();
           cleanUpDoxygen();
           exit(1);
@@ -11501,7 +11501,7 @@ void readConfiguration(int argc, char **argv)
           int retVal = Debug::setFlagStr(debugLabel);
           if (!retVal)
           {
-            err("option \"-d\" has unknown debug specifier: \"{}\".\n",debugLabel);
+            msg("option \"-d\" has unknown debug specifier: \"{}\".\n",debugLabel);
             devUsage();
             cleanUpDoxygen();
             exit(1);