valgrind 错误：条件跳转或移动取决于未初始化的值

Question

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;
} 

当我用-g选项编译程序并用 valgrind 运行它时，它显示：

==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)

我不知道为什么我会收到此错误。

这是什么意思？

他们怎么会损害我的程序？

我怎样才能删除它们？

Answer 1

这些不是来自您的代码，而是来自/lib/ld-*.so动态库加载器。

这是一段使用如此广泛的代码，我很难想象它有如此明显的错误，所以我认为 valgrind 会给你误报。您可能可以放心地忽略它们。