Optional rule throws shift/reduce conflict

[anandvn]

Hi,

I'm new to bison and need help to acheive my following syntax,

syntax1: decl_spec semicolon

syntax2: decl_spec decl_attrib(optional) init_spec decl_attrib(optional)
semicolon


To achieve this i wrote bison grammar as,


declaration: decl_spec semicolon 
           |decl_spec decl_attrib init_spec decl_attrib semicolon


decl_attrib:  /* Since this is optional i kept blank rule */
           | '__attribute__'

But am getting shift/reduce conflicts. Also my grammar is not parsing the
input successfully, throws parser syntax error.

Please correct me where i did mistake. Also please let me know if any other
information required to fix this.

Thanks,
Anand V
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