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Document semicolon warnings.

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* NEWS (2.5): Here.
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Joel E. Denny
2009-04-04 02:10:33 -04:00
parent c4fae1ef48
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NEWS
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@@ -17,6 +17,27 @@ Bison News
for any NAME and VALUE. Omitting `=VALUE' on the command line is
equivalent to omitting `"VALUE"' in the declaration.
** Temporary hack for adding a semicolon to the user action.
Previously, Bison appended a semicolon to every user action for
reductions when the output language defaulted to C (specifically, when
neither %yacc, %language, %skeleton, or equivalent command-line
options were specified). This allowed actions such as
exp: exp "+" exp { $$ = $1 + $3 };
instead of
exp: exp "+" exp { $$ = $1 + $3; };
As a first step in removing this misfeature, Bison now issues a
warning when it appends a semicolon. Moreover, in cases where Bison
cannot easily determine whether a semicolon is needed (for example, an
action ending with a cpp directive or a braced compound initializer),
it no longer appends one. Thus, the C compiler might now complain
about a missing semicolon where it did not before. Future releases of
Bison will cease to append semicolons entirely.
* Changes in version 2.4.2 (????-??-??):
* Changes in version 2.4.1 (2008-12-11):