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问题描述
我有一个程序:
#include <stdio.h>
int call(){
int x=25;
++x;
return x;
}
int main(){
int p;
p=call();
printf("%d",p);
return 0;
}
当我使用-g选项编译程序并使用valgrind运行它时，它显示:
When I compile the program with -g option and run it with valgrind it shows:
==15469== 1 errors in context 1 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546F83: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E6CC: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 1 errors in context 2 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546E01: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E6CC: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 1 errors in context 3 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546DF9: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E6CC: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 1 errors in context 4 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546E01: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E7D9: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 1 errors in context 5 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546DF9: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E7D9: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 2 errors in context 6 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546F83: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E7D9: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 2 errors in context 7 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x547871: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E7D9: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469==
==15469== 4 errors in context 8 of 8:
==15469== Conditional jump or move depends on uninitialised value(s)
==15469== at 0x546F4D: _dl_relocate_object (in /lib/ld-2.12.90.so)
==15469== by 0x53E7D9: dl_main (in /lib/ld-2.12.90.so)
==15469== by 0x55094D: _dl_sysdep_start (in /lib/ld-2.12.90.so)
==15469== by 0x540222: _dl_start (in /lib/ld-2.12.90.so)
==15469== by 0x53B876: ??? (in /lib/ld-2.12.90.so)
==15469==
==15469== ERROR SUMMARY: 13 errors from 8 contexts (suppressed: 0 from 0)
我不知道为什么会收到此错误.
I don't know why I am getting this error.
这是什么意思?
它们如何危害我的程序?
How can they harm my program?
如何删除它们?
推荐答案
这些不是来自您的代码，而是来自动态库加载器/lib/ld-*.so.
These are not from your code, but from /lib/ld-*.so which is the dynamic library loader.
这是一段使用广泛的代码，我几乎无法想象它有这么明显的错误，因此我认为valgrind会给您带来误报.您可能可以放心地忽略它们.
This is such a widely used piece of code that I can hardly imagine that it has such an obvious bug, so I think valgrind is giving you false positives. You can probably safely ignore them.
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