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warnings: used but undeclared symbols are warnings

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We used to raise an error if a symbol appears only in a %printer or
%destructor.  Make it a warning.

* src/symtab.h (status): New enum.
(symbol): Replace the binary "declared" with the three-state "status".
Adjust dependencies.
* src/symtab.c (symbol_check_defined): Needed symbols are an error,
whereas "used" are simply warnings.
* src/symlist.c (symbol_list_destructor_set, symbol_list_printer): Set
symbol status to 'used' when associated to destructors or printers.
* input.at (Undeclared symbols used for a printer or destructor): New.
This commit is contained in:
Victor Santet
2012-06-19 16:14:55 +02:00
committed by Akim Demaille
parent dda2c1adba
commit b921d92fcb
6 changed files with 66 additions and 10 deletions
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24
tests/input.at
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@@ -271,6 +271,30 @@ input.y:5.10-24: previous declaration
AT_CLEANUP
## ---------------------------------------------------- ##
## Undeclared symbols used for a printer or destructor. ##
## ---------------------------------------------------- ##
AT_SETUP([Undeclared symbols used for a printer or destructor])
AT_DATA([[input.y]],
[[%printer {} token1
%destructor {} token2
%%
exp: "a";
]])
AT_BISON_CHECK([input.y], [0], [],
[[input.y:1.13-18: warning: symbol token1 is used, but is not defined as a token and has no rules
input.y:2.16-21: warning: symbol token2 is used, but is not defined as a token and has no rules
input.y: warning: 2 nonterminals useless in grammar
input.y:1.13-18: warning: nonterminal useless in grammar: token1
input.y:2.16-21: warning: nonterminal useless in grammar: token2
]])
AT_CLEANUP
## ---------------------------------------- ##
## Unused values with default %destructor. ##