Why "'X' used but never defined" is a warning and not error in gcc?

[Vincent Lefevre]

On 2012-10-08 12:43:09 +0200, Oleg Endo wrote:
> Doesn't look so.  You can turn all warnings into errors by -Werror, but
> there's no option to control this particular warning individually.

It is possible to turn *particular* warnings into errors, not just
all warnings, with -Werror=<list_of_warnings>.

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