链接时调试符号丢失？ [英] Debugging Symbols Lost When Linking?

问题描述

我正在尝试使用调试符号编译程序，以便valgrind将给我行数字。我发现如果我一次编译一个简单的测试程序（用-g），那么它包含符号。但是，如果我编译两遍（即编译然后链接），那么它不包含调试符号。

以下是单程通用的编译命令：

  g ++ -g file.c -o file 
  

两次通过

  g ++ -g -c file.c -o file.o 
 g ++ -g file.o -o file 
  

实际的程序看起来像这样，包含一个简单的无效写入

  int main（）{
 int * x = new int [10]; 
 x [10] = 1; 
  

}

如果我用一个编译通过，然后valgrind给出以下（注意末尾的行号）

  == 24114 == 1个块中的40个字节是绝对丢失损失记录2 of 9 
 == 24114 == at 0xB823：malloc（vg_replace_malloc.c：266）
 == 24114 == by 0x5768D：operator new（unsigned long）（in / usr /lib/libstdc++.6.0.9.dylib）
 == 24114 == by 0x576DA：operator new []（unsigned long）（in /usr/lib/libstdc++.6.0.9.dylib）
 == 24114 == 0x100000F09：main（file.c：3）
  

而如果我编译两次通过我得到这个（没有行号）：

  == 24135 == 1块中的40个字节绝对丢失损失记录2 of 9 
 == 24135 == at 0xB823：malloc（vg_replace_malloc.c：266）
 == 24135 == by 0x5768D：operator new（unsigned long）（in / usr / lib / libstdc ++ 6.0.9.dylib）
 == 24135 == by 0x576DA：operator new []（unsigned long）（in /usr/lib/libstdc++.6.0.9.d ylib）
 == 24135 == by 0x100000F09：main（in ./file）
  

对此的任何见解都将不胜感激。我在OS X上使用gcc 4.2.1版10.7.3

解决方案

只是为了将这个问题标记为回答（so它不是不必要地打开并被其他人阅读）

=>
答案是从user1288111到最初的问题的评论。

I'm trying to compile a program with debugging symbols so that valgrind will give me line numbers. I have found that if I compile a simple test program in one go (with -g) then it contains the symbols. However, if I compile in two passes (i.e. compile then link) then it does not contain the debugging symbols.

Here's the compile command for the single pass case:

g++ -g file.c -o file

And for two passes

g++ -g -c file.c -o file.o
g++ -g file.o -o file

The actual program looks like this and contains a simple Invalid Write

int main(){
    int* x = new int[10];
    x[10]=1;

}

If I compile with one pass then valgrind gives the following (note the line number at the end)

==24114== 40 bytes in 1 blocks are definitely lost in loss record 2 of 9
==24114==    at 0xB823: malloc (vg_replace_malloc.c:266)
==24114==    by 0x5768D: operator new(unsigned long) (in /usr/lib/libstdc++.6.0.9.dylib)
==24114==    by 0x576DA: operator new[](unsigned long) (in /usr/lib/libstdc++.6.0.9.dylib)
==24114==    by 0x100000F09: main (file.c:3)

whereas if I compile in two passes I get this (with no line number):

==24135== 40 bytes in 1 blocks are definitely lost in loss record 2 of 9
==24135==    at 0xB823: malloc (vg_replace_malloc.c:266)
==24135==    by 0x5768D: operator new(unsigned long) (in /usr/lib/libstdc++.6.0.9.dylib)
==24135==    by 0x576DA: operator new[](unsigned long) (in /usr/lib/libstdc++.6.0.9.dylib)
==24135==    by 0x100000F09: main (in ./file)

Any insight on this would be much appreciated. I am using gcc version 4.2.1 on OS X 10.7.3

解决方案

Just for marking this question as "answered" (so it's not needlessly opened and read by others).

=> Answer is found as the comment from "user1288111" to the initial question.

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