Akim Demaille c9d5bcc938 headers: move CPP guards into YY_*_INCLUDED to avoid collisions ...

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.

2012-10-01 11:18:22 +02:00

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