keep-symbol

1. 重新編譯程式。

   [dywang@dyH gcc]$ gcc -g -o stripex1 stripex1.c
   [dywang@dyH gcc]$ ll stripex1
   -rwxrwxr-x. 1 dywang dywang 8195 Sep  1 08:58 stripex1
   

2. 移除符號項目時指定保留某些符號資訊

   [dywang@dyH gcc]$ strip -s -Kstripex1.c stripex1
   

3. 修整後的執行檔，符號項目從 75 項變成 28 項，注意項目符號第二項名字為 stripex1.c，就是保留下來的項目。
   

   Symbol table '.dynsym' contains 4 entries:
      Num:    Value          Size Type    Bind   Vis      Ndx Name
        0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
        1: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND printf@GLIBC_2.2.5 (2)
        2: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__
        3: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __libc_start_main@GLIBC_2.2.5 (2)
   
   Symbol table '.symtab' contains 28 entries:
      Num:    Value          Size Type    Bind   Vis      Ndx Name
        0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
        1: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS stripex1.c
        2: 0000000000400200     0 SECTION LOCAL  DEFAULT    1 
        3: 000000000040021c     0 SECTION LOCAL  DEFAULT    2 
        4: 000000000040023c     0 SECTION LOCAL  DEFAULT    3 
        5: 0000000000400260     0 SECTION LOCAL  DEFAULT    4 
        6: 0000000000400280     0 SECTION LOCAL  DEFAULT    5 
        7: 00000000004002e0     0 SECTION LOCAL  DEFAULT    6 
        8: 0000000000400320     0 SECTION LOCAL  DEFAULT    7 
        9: 0000000000400328     0 SECTION LOCAL  DEFAULT    8 
       10: 0000000000400348     0 SECTION LOCAL  DEFAULT    9 
       11: 0000000000400360     0 SECTION LOCAL  DEFAULT   10 
       12: 0000000000400390     0 SECTION LOCAL  DEFAULT   11 
       13: 00000000004003a8     0 SECTION LOCAL  DEFAULT   12 
       14: 00000000004003e0     0 SECTION LOCAL  DEFAULT   13 
       15: 0000000000400608     0 SECTION LOCAL  DEFAULT   14 
       16: 0000000000400618     0 SECTION LOCAL  DEFAULT   15 
       17: 0000000000400634     0 SECTION LOCAL  DEFAULT   16 
       18: 0000000000400660     0 SECTION LOCAL  DEFAULT   17 
       19: 0000000000600700     0 SECTION LOCAL  DEFAULT   18 
       20: 0000000000600710     0 SECTION LOCAL  DEFAULT   19 
       21: 0000000000600720     0 SECTION LOCAL  DEFAULT   20 
       22: 0000000000600728     0 SECTION LOCAL  DEFAULT   21 
       23: 00000000006008b8     0 SECTION LOCAL  DEFAULT   22 
       24: 00000000006008c0     0 SECTION LOCAL  DEFAULT   23 
       25: 00000000006008e8     0 SECTION LOCAL  DEFAULT   24 
       26: 00000000006008f8     0 SECTION LOCAL  DEFAULT   25 
       27: 0000000000000000     0 SECTION LOCAL  DEFAULT   26 
   

4. 查看檔案大小，從 8195 bytes 降至 5196 bytes。

   [dywang@dyH gcc]$ ll stripex1
   -rwxrwxr-x. 1 dywang dywang 5196 Sep  1 09:03 stripex1