gcc - gcc 选项 -pthread 是什么意思？

Question

我花了很多时间来查找所有 gcc 选项的文档。我在 ubuntu 机器上，所以甚至不确定这是否与我相关。

来自这个 make 规则:

my-server: my-server.c
  $(CC) -Wall -pthread my-server.c -o my-server

我找到了这个选项摘要: https://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Option-Summary.html

Answer 1

来自 man gcc

-pthread

Add support for multithreading using the POSIX threads library. This option sets flags for both the preprocessor and linker. It does not affect the thread safety of object code produced by the compiler or that of libraries supplied with it. These are HP-UX specific flags.

请注意，它不同于-lpthread。 -lpthread 选项不设置预处理器标志。例如宏_REENTRANT和__USE_REENTRANT等