Question

我正在编译一个程序，它给了我以下错误。 gcc的版本是（GCC）4.8.5 20150623（Red Hat 4.8.5-4。

Utils.cpp: In static member function ‘static double Utils::process_mem_usage()’:
Utils.cpp:33:30: error: ‘_SC_PAGE_SIZE’ was not declared in this scope
  long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // if x86-64 is configured to use 2MB pages
                              ^
Utils.cpp:33:43: error: ‘sysconf’ was not declared in this scope
  long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // if x86-64 is configured to use 2MB pages

Answer 1

包括<unistd.h>，其中_SC_PAGE_SIZE已定义且宣布sysconf()。

请参阅POSIX规范：http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html

C ++中sysconf（）出错

1 个答案: