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update Wextra doc

:ADDPATCH doc:

The manual page claims that Wextra warns for any of several
floating-point events that often indicate errors, such as overflow,
underflow, loss of precision, etc. I wasn't able to find any instance
of this. I am fairly sure that Wextra doesn't do such thing.

This patch is in accordance with the discussion about fixing PR7651.
See http://gcc.gnu.org/ml/gcc/2007-01/msg00391.html

OK for mainline?
Should this change also go into 4.2 ?

2007-02-10 Manuel Lopez-Ibanez <manu@gcc.gnu.org>

* doc/invoke.texi (Wextra): Delete outdated paragraph.

Attachment: wextra-doc.diff
Description: Text document

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