我有这一资料来源:

// ConstPointer.cpp
const short * const const_short_p_const = 0;
const short * const_short_p = 0;

(SUN C++ Compiler 5.10):

# CC ConstPointer.cpp -c -o ConstPointer.o
# CC -g ConstPointer.cpp -c -o ConstPointer-debug.o

此处为物体文档的编号, debug information:

# nm -C ConstPointer.o


ConstPointer.o:

[Index]   Value      Size    Type  Bind  Other Shndx   Name

[2]     |         0|       0|SECT |LOCL |0    |10     |
[3]     |         0|       0|SECT |LOCL |0    |9      |
[4]     |         0|       0|OBJT |LOCL |0    |6      |Bbss.bss
[1]     |         0|       0|FILE |LOCL |0    |ABS    |ConstPointer.cpp
[5]     |         0|       0|OBJT |LOCL |0    |3      |Ddata.data
[6]     |         0|       0|OBJT |LOCL |0    |5      |Dpicdata.picdata
[7]     |         0|       0|OBJT |LOCL |0    |4      |Drodata.rodata
[9]     |         4|       4|OBJT |GLOB |0    |3      |const_short_p
[8]     |         0|       4|OBJT |LOCL |0    |3      |const_short_p_const

Here are the symbol names of the object file with debug information:

# nm -C ConstPointer-debug.o


ConstPointer-debug.o:

[Index]   Value      Size    Type  Bind  Other Shndx   Name

[4]     |         0|       0|SECT |LOCL |0    |9      |
[2]     |         0|       0|SECT |LOCL |0    |8      |
[3]     |         0|       0|SECT |LOCL |0    |10     |
[10]    |         0|       4|OBJT |GLOB |0    |3      |$XAHMCqApZlqO37H.const_short_p_const
[5]     |         0|       0|NOTY |LOCL |0    |6      |Bbss.bss
[1]     |         0|       0|FILE |LOCL |0    |ABS    |ConstPointer.cpp
[6]     |         0|       0|NOTY |LOCL |0    |3      |Ddata.data
[7]     |         0|       0|NOTY |LOCL |0    |5      |Dpicdata.picdata
[8]     |         0|       0|NOTY |LOCL |0    |4      |Drodata.rodata
[9]     |         4|       4|OBJT |GLOB |0    |3      |const_short_p

为什么有变式的<代码>const_short_p_const? <代码>g++>在汇编假信息时未作改动。 它像我的汇编者一样。 你认为什么? 第二张<条码>const(固定点)。

EDIT for Drew Hall s comment: For example you have two files:

// ConstPointer.cpp
const short * const const_short_p_const = 0;

void foo();

int main(int argc, const char *argv[]) {
  foo();
  return 0;
}

以及

// ConstPointer2.cpp
extern const short * const const_short_p_const;

void foo() {
  short x = *const_short_p_const;
}

罚款:

# CC ConstPointer2.cpp -g -c -o ConstPointer2.o
# CC ConstPointer.cpp -g -c -o ConstPointer.o      

但是,由于符号不同,连接并不可行。 Const Pointer2.o的文号为const_short_p_const,但Const Pointer.o的文号为$XAHMCqApZlqO37H.const_short_p_const。

# CC ConstPointer.o ConstPointer2.o -o ConstPointer
Undefined                       first referenced
 symbol                             in file
const_short_p_const                 ConstPointer2.o