请教用flex和bison写的程序的调式

icoming

bison的手册上不是说会把下面的信息打印出来如果bison使用了-t选项？
Each time the parser calls yylex, what kind of token was read.
Each time a token is shifted, the depth and complete contents of the state stack
Each time a rule is reduced, which rule it is, and the complete contents of the state stack afterward.
我用了这个选项之后，跟没用这个选项打印出来的信息是一样的啊？
郁闷死人了。
一个用flex和bison写的程序不知道怎么调式好