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yacc.c: initialize yylval and yylloc.

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When generating a pure push parser, the initialization of yylval and
yylloc may not be visible to the compiler.  With warnings enabled, GCC
4.3.6, 4.4.7, 4.5.4, and 4.6.3 report uninitialized uses of
yylval/yylloc.  Using local pragmas to disable these warnings is not
supported before 4.6, and 4.6 does not support it properly.  So
initialize yylval and yylloc at their definition.  Reported by Peter
Simons.  See
http://lists.gnu.org/archive/html/bison-patches/2012-10/msg00133.html

* data/c.m4 (b4_yyloc_default_define): New.
* data/yacc.c: Use it when locations are requested.
(YYLVAL_INITIALIZE): Replace by...
(YY_INITIAL_VALUE): this.
(yyparse): Initialize yylloc and yylval.
Therefore, remove the initialization of yylloc's field.
* data/glr.c: Likewise.
This commit is contained in:
Akim Demaille
2012-10-26 11:25:41 +02:00
parent 0fb7b95c5f
commit a68b1f237e
4 changed files with 44 additions and 28 deletions
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11
NEWS
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@@ -2,6 +2,17 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
We consider compiler warnings about Bison generated parsers to be bugs.
Rather than working around them in your own project, please consider
reporting them to us.
** Bug fixes
Warnings about uninitialized yylval and/or yylloc for push parsers with a
pure interface have been fixed for GCC 4.0 up to 4.8, and Clang 2.9 to
3.2.
Other issues in the test suite have been addressed.
* Noteworthy changes in release 2.6.4 (2012-10-23) [stable]