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headers: move CPP guards into YY_*_INCLUDED to avoid collisions

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See <http://lists.gnu.org/archive/html/bug-bison/2012-09/msg00016.html>.

* data/c.m4 (b4_cpp_guard): Prepend YY_ and append _INCLUDED.
* tests/headers.at: Adjust.
* NEWS, doc/bison.texi: Document.
This commit is contained in:
Akim Demaille
2012-09-27 09:43:49 +02:00
parent 5a05f42ecf
commit c9d5bcc938
4 changed files with 33 additions and 4 deletions
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11
NEWS
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@@ -26,6 +26,17 @@ GNU Bison NEWS
foo.y:5.10-25: result type clash on merge function 'merge': <t3> != <t2>
foo.y:4.13-27: previous declaration
** Header guards (yacc.c, glr.c, glr.cc)
In order to avoid collisions, the header guards are now
YY_<PREFIX>_<FILE>_INCLUDED, instead of merely <PREFIX>_<FILE>.
For instance the header generated from
%define api.prefix "calc"
%defines "lib/parse.h"
will use YY_CALC_LIB_PARSE_H_INCLUDED as guard.
* Noteworthy changes in release 2.6.2 (2012-08-03) [stable]
** Bug fixes