Merge with 3.23 (only comment changes)

BUILD/compile-pentium-gcov:
  Use local file
mysys/thr_alarm.c:
  Get comment from 3.23
sql/mini_client.cc:
  Get comment from 3.23

BUILD/compile-pentium-gcov

@@ -3,7 +3,7 @@
 path=`dirname $0`
 . "$path/SETUP.sh"
 
-extra_flags="$pentium_cflags  -fprofile-arcs -ftest-coverage -fmessage-length=0"
+extra_flags="$pentium_cflags -O2 -fprofile-arcs -ftest-coverage -fmessage-length=0 "
 extra_configs="$pentium_configs $debug_configs --disable-shared $static_link"
 extra_configs="$extra_configs  --with-innodb --with-berkeley-db"
 

mysys/thr_alarm.c

@@ -770,7 +770,9 @@ bool thr_got_alarm(thr_alarm_t *alrm_ptr)
 void thr_end_alarm(thr_alarm_t *alrm_ptr)
 {
   thr_alarm_t alrm= *alrm_ptr;
+  /* alrm may be zero if thr_alarm aborted with an error */
   if (alrm && alrm->crono)
+
   {
     KillTimer(NULL, alrm->crono);
     alrm->crono = 0;

sql/mini_client.cc

@@ -18,8 +18,8 @@
   mini MySQL client to be included into the server to do server to server
   commincation by Sasha Pachev
 
- Note: all file-global symbols must begin with mc_ , even the static ones, just
- in case we decide to make them external at some point
+  Note: all file-global symbols must begin with mc_ , even the static ones,
+  just in case we decide to make them external at some point
 */
 
 #include <my_global.h>
@@ -655,6 +655,11 @@ mc_mysql_connect(MYSQL *mysql,const char *host, const char *user,
     sprintf(host_info=buff,ER(CR_TCP_CONNECTION),host);
     DBUG_PRINT("info",("Server name: '%s'.  TCP sock: %d", host,port));
     thr_alarm_init(&alarmed);
+    /*
+      We don't have to check status for thr_alarm as it's not fatal if
+      we didn't manage to set an alarm. (In this case the socket call
+      will just block for a while).
+    */
     thr_alarm(&alarmed, net_read_timeout, &alarm_buff);
     sock = (my_socket) socket(AF_INET,SOCK_STREAM,0);
     thr_end_alarm(&alarmed);