Bug#24274 option "--big-test" of mysql-test-run.pl does not work anymore

 - Set environment variable BIG_TEST when using --big-test
 - Skip comment lines when looking for features a test case supports.

mysql-test/lib/mtr_cases.pl

@@ -593,6 +593,9 @@ sub mtr_options_from_test_file($$) {
 
   while ( my $line= <$F> )
   {
+    # Skip line if it start's with #
+    next if ( $line =~ /^#/ );
+
     # Match this line against tag in "tags" array
     foreach my $tag (@tags)
     {

mysql-test/mysql-test-run.pl

@@ -164,7 +164,7 @@ our $exe_libtool;
 
 our $opt_bench= 0;
 our $opt_small_bench= 0;
-our $opt_big_test= 0;            # Send --big-test to mysqltest
+our $opt_big_test= 0;
 
 our @opt_extra_mysqld_opt;
 
@@ -919,6 +919,14 @@ sub command_line_setup () {
     $opt_sleep_time_after_restart= $opt_sleep;
   }
 
+  # --------------------------------------------------------------------------
+  # Big test flags
+  # --------------------------------------------------------------------------
+  if ( $opt_big_test )
+  {
+    $ENV{'BIG_TEST'}= 1;
+  }
+
   # --------------------------------------------------------------------------
   # Gcov flag
   # --------------------------------------------------------------------------
@@ -4370,11 +4378,6 @@ sub run_mysqltest ($) {
     mtr_add_arg($args, "--timer-file=%s/log/timer", $opt_vardir);
   }
 
-  if ( $opt_big_test )
-  {
-    mtr_add_arg($args, "--big-test");
-  }
-
   if ( $opt_compress )
   {
     mtr_add_arg($args, "--compress");
@@ -4765,9 +4768,8 @@ Options to control what test suites or cases to run
   skip-rpl              Skip the replication test cases.
   skip-im               Don't start IM, and skip the IM test cases
   skip-test=PREFIX      Skip test cases which name are prefixed with PREFIX
-  big-test              Pass "--big-test" to mysqltest which will set the
-                        environment variable BIG_TEST, which can be checked
-                        from test cases.
+  big-test              Set the environment variable BIG_TEST, which can be
+                        checked from test cases.
 
 Options that specify ports