使用dumpbin查看C库信息时,UNDEF和notype()是什么意思？

我使用dumpbin / symbols来查看我创建的库.某些函数在输出中具有UNDEF notype.这意味着什么？是否有任何链接来研究dumpbin输出的结构？

解决方法:

我们可以看一下the MSDN documentation for dumpbin /SYMBOLS：

This option displays the COFF symbol table. Symbol tables exist in all
object files. A COFF symbol table appears in an image file only if it
is linked with /DEBUG.

The following is a description of the output for /SYMBOLS. Additional
information on the meaning of /SYMBOLS output can be found by looking
in winnt.h (IMAGE_SYMBOL and IMAGE_AUX_SYMBOL), or COFF documentation.

Given the following sample dump:

Dump of file main.obj
File Type: COFF OBJECT

COFF    SYMBOL    TABLE
000    00000000   DEBUG      notype      Filename      | .file
      main.cpp
002   000B1FDB   ABS      notype      Static      | @comp.id
003   00000000   SECT1      notype      Static      | .drectve
      Section length       26, #relocs   0, #linenums    0, checksum 722C964F
005   00000000   SECT2      notype      Static      | .text
      Section length      23, #relocs      1, #linenums    0, checksum 459FF65F, selection    1 (pick no duplicates)
007   00000000   SECT2      notype ()   External      | _main
008   00000000   UNDEF      notype ()   External      | ?MyDump@@YAXXZ (void __cdecl MyDump(void))

String Table Size = 0x10 bytes

Summary

      26 .drectve
      23 .text

The following description, for lines that begin with a symbol number,
describes columns that have information relevant to users:

The first three-digit number is the symbol index/number.

• If the third column contains SECTx, the symbol is defined in that
  section of the object file. But if UNDEF appears, it is not defined in
  that object and must be resolved elsewhere.

• The fifth column (Static, External) tells whether the symbol is
  visible only within that object, or whether it is public (visible
  externally). A Static symbol, _sym, wouldn’t be linked to a Public
  symbol _sym; these would be two different instances of functions named
  _sym.

• The last column in a numbered line is the symbol name, both
  decorated and undecorated.

notype()的含义恰如其分：它没有类型.

标签：c,dumpbin
来源： https://codeday.me/bug/20191013/1911252.html