‘PTHREAD_MUTEX_RECURSIVE’未声明(在此函数内第一次使用)

GCC编译pthread的时候，用到PTHREAD_MUTEX_RECURSIVE的时候，要在MAKEFILE里面加上-D_GNU_SOURCE

 

参考http://hi.baidu.com/yatusiter/blog/item/46aba8ec99b5aa2063d09f46.html

 

gcc -D_GNU_SOURCE hello.c 
means the compiler will use the GNU standard of compilation, the superset of all 
other standards under GNU C libraries.