Akim Demaille 78bb152a63 tests: also check -Wchar-subscripts ...

GCC's -Wchar-subscripts may report issues on platforms where char is
unsigned.  Unfortunately the current CI does not reproduce the
problem.  But that would allow contributors to report issues if the
warning appears somewhere.

See 139d065594.
Problem reported by Andy Fiddaman in:
https://lists.gnu.org/r/bug-bison/2019-12/msg00021.html

* configure.ac (warn_common): Add -Wchar-subscripts.

2019-12-31 12:00:02 +01:00

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