c - valgrind 错误 : Conditional jump or move depends on uninitialised value(s)

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;
} 

当我使用 -g 选项编译程序并使用 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)

我不知道为什么会出现此错误。

这是什么意思？

它们如何损害我的程序？

我怎样才能删除它们？

Answer 1

这些不是来自您的代码，而是来自动态库加载器 /lib/ld-*.so。

这是一段被广泛使用的代码，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。您可以安全地忽略它们。