On 25 Oct 2006, at 17:05, [EMAIL PROTECTED] wrote:
Hi Bison list,
using bison version 2.2.
Message from bison:
pl1-parser.y:873.17-63: warning: unused value: $3
This warning I find a bit confusing...
Line 873 contains: | procoptionlist ',' {$$=$1;} procoption {$$=$1;}
$3 refers to the embedded action after the comma.
My grammar set a number of attributes in an allocated structure
using $0 to
reference the structure on the stack. The full rules are as follow
procoptionlist:
{ $<pol>$ = newProcOptionList(); }
procoption
{ $$ = $<pol>1; }
| procoptionlist procoption {$$=$1;}
| procoptionlist ',' {$$=$1;} procoption {$$=$1;}
;
procoption:
MAIN { if(setTristateAttribute(&($<pol>0)->main,1)<0)
YYERROR; }
;
unless I am missing something $3 in line 873 is by the rule
procoption.
Is there anyway to supress this IMO, unnecessary warning.
I think you should take away the use of $0, because it may no longer
be guaranteed, in view of that Bison is switching to other types of
containers than an underlying array. Then you mid-rule action becomes
unnecessary.
Hans Aberg
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