对 -finstrument-functions 的未定义引用 [英] Undefined reference to -finstrument-functions

问题描述

我正在尝试跟踪内核函数并且我正在使用 -finstrument-functions 来做到这一点，但我得到了如下未定义的引用错误:

I am trying to trace kernel functions and I am using -finstrument-functions to do that, but I get undefined reference errors as below:

arch/arm/kernel/elf.c:9: undefined reference to `__cyg_profile_func_enter'
arch/arm/kernel/elf.c:13: undefined reference to `__cyg_profile_func_exit'
arch/arm/kernel/built-in.o: In function `elf_set_personality':
arch/arm/kernel/elf.c:42: undefined reference to `__cyg_profile_func_enter'
arch/arm/kernel/elf.c:75: undefined reference to `__cyg_profile_func_exit'

drivers 中还有更多类似上述的错误.我已经导出了 __cyg_profile_func_enter 和 __cyg_profile_func_exit 符号，但我仍然收到这个错误.我使用 linux 4.1 内核 和 arm 板.

There are many more errors similar to above in drivers also. I have exported the __cyg_profile_func_enter and __cyg_profile_func_exit symbols, but still I get this error. I use linux 4.1 kernel and arm board.

推荐答案

__cyg_profile_func_enter 和 __cyg_profile_func_exit 的条目是否也在头文件中.如果没有，请在头文件中声明这些函数并确保该模块正在编译.

Have you made the entries of __cyg_profile_func_enter and __cyg_profile_func_exit in the header file as well. If not then pls declare these function in the header file and make sure that module is compiling.

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