Akim Demaille 3a526f5cc3 tests: don't expect $EGREP to support -w ...

Does not work on Solaris 10.  Reported by Dennis Clarke.
http://lists.gnu.org/archive/html/bug-bison/2012-11/msg00009.html
* tests/headers.at (Several parsers): Use Perl instead.
While at it, run it only once, on all the generated headers.
Adjust to YY_NULL be defined in position.hh.

2012-11-08 19:41:45 +01:00

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