利用Makefile技巧,製作release version 或 debug version bin檔 (Using Makefile to compile release or debug bin file)

We can add some LABEL to mark some debug message that need to be show up in "debug version".
Oppositely , we can disable these debug message for "release version"with the
same source.


========= Makefile===============================

ifeq ($(DEBUG),y)
CFLAGS :=$(CFLAGS) -DDEBUG
endif

=========compile command =========================
 release mode:
 make clean; make

debug mode:
make clean; make DEBUG:=y

出貨給客戶,就編release mode給他,如此一來他們不會看到任何message從terminal
跑出來

若是自己要debug 相同的code就編debug mode,方便自己看message
就不需要進去code在修修改改了

=======Source code example==========================

      #ifdef DEBUG
       printf ( "debug message" );
      #endif

  if debug mode , "debug message" will show up , and release mode doesn't.


    為了整齊美觀,可以特地寫一個小function
    把debug message 寫在裡面
    就不會整篇code看到一大堆 #ifdef DEBUG



 
   for example:

   void debug_print_info_variable ( char *info , char *var)
{
    #ifdef DEBUG
    printf ( "%s , %s\n" , info , var );
    #endif
}









.....
....
.......
source code:
src_child_status =  g_match_info_fetch ( child_match_info , 6 ) debug_print_info_variable ("\nSTATUS= %s\n", src_child_status);
src_real_child_status = update_treeview_TransferDeviceStatus( src_child_status );
debug_print_info_variable ("\nREAL STATUS= %s\n", src_real_child_status);