结构包含在两个 header 文件中，我都没有

Question

我正在尝试在 c++ 中使用 SCHED_DEADLINE，我需要将struct sched_attr发送到和ioctl ，所以我包含了<linux/sched/types.h> ，即 header 也恰好包含strut sched_param 。 我还包括了<string> ，其中包括 c++ 的标准头文件，最终包括include\bits\sched.h ，它也定义了struct sched_param 。 编译器（显然）并不特别喜欢这个。 我在我的代码中使用了 header 保护（ _BITS_TYPES_STRUCT_SCHED_PARAM ）来让编译器不包含include\bits\sched.h ，但感觉应该有一种“更好”的方式。

> Executing task in folder sched_deadline_testing: arm-linux-gnueabihf-g++ -o LSM9DS0 src/LSM9DS0.cpp -Wall --pedantic <

In file included from src/LSM9DS0.cpp:36:
/usr/arm-linux-gnueabihf/include/linux/sched/types.h:7:8: error: redefinition of ‘struct sched_param’
 struct sched_param {
        ^~~~~~~~~~~
In file included from /usr/arm-linux-gnueabihf/include/bits/sched.h:74,
                 from /usr/arm-linux-gnueabihf/include/sched.h:43,
                 from /usr/arm-linux-gnueabihf/include/pthread.h:23,
                 from /usr/arm-linux-gnueabihf/include/c++/8/arm-linux-gnueabihf/bits/gthr-default.h:35,
                 from /usr/arm-linux-gnueabihf/include/c++/8/arm-linux-gnueabihf/bits/gthr.h:148,
                 from /usr/arm-linux-gnueabihf/include/c++/8/ext/atomicity.h:35,
                 from /usr/arm-linux-gnueabihf/include/c++/8/bits/basic_string.h:39,
                 from /usr/arm-linux-gnueabihf/include/c++/8/string:52,
                 from src/LSM9DS0.cpp:20:
/usr/arm-linux-gnueabihf/include/bits/types/struct_sched_param.h:23:8: note: previous definition of ‘struct sched_param’
 struct sched_param

如果这很重要，代码就在这里。 我也尝试过这种交叉编译和本地编译，两者都会导致问题。

Answer 1

你运气不好。 这两个标头不兼容。 您只需避免将<linux/sched/types.h>和<string>都包含在同一个翻译单元中。 It's probably worth noting that being a Linux kernel header, the former is probably not intended to be used in C++, nor has there been an attempt to make it compatible.