error: ‘CLOCK_MONOTONIC‘ undeclared (first use in this function)

最新推荐文章于 2022-12-05 13:03:38 发布

LS_FIGHTING

最新推荐文章于 2022-12-05 13:03:38 发布

阅读量2.1k

点赞数

分类专栏： C/C++ 文章标签： c++ 计时

本文链接：https://blog.youkuaiyun.com/LEE_FIGHTING_JINGYU/article/details/120867985

版权

C/C++ 专栏收录该内容

7 篇文章

订阅专栏

错误信息：

/home/xx/test/main.c: In function ‘main’:
/home/xx/test/main.c:37:21: error: storage size of ‘start’ isn’t known
   37 |     struct timespec start, end; //nanoseconds
      |                     ^~~~~
/home/xx/test/main.c:37:28: error: storage size of ‘end’ isn’t known
   37 |     struct timespec start, end; //nanoseconds
      |                            ^~~
/home/xx/test/main.c:43:5: warning: implicit declaration of function ‘clock_gettime’ [-Wimplicit-function-declaration]
   43 |     clock_gettime(CLOCK_MONOTONIC, &start);
      |     ^~~~~~~~~~~~~
/home/xx/test/main.c:43:19: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function)
   43 |     clock_gettime(CLOCK_MONOTONIC, &start);
      |                   ^~~~~~~~~~~~~~~
/home/xx/test/main.c:43:19: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [CMakeFiles/WBSM4.dir/build.make:63: CMakeFiles/xx.dir/test/main.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:78: CMakeFiles/xx.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

解决方案：

在CMakeLists.txt文件中添加编译器：

add_compile_options(-D_POSIX_C_SOURCE=199309L)

解决方案来源【版权侵删】：

c++ - error: 'CLOCK_MONOTONIC' undeclared (first use in this function) - Stack Overflow

error: ‘CLOCK_MONOTONIC’ undeclared问题解决_whahu1989的专栏-优快云博客