[Bug driver/66293] Support -Weverything to enable all warnings

[jeanmichael.celerier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66293

Jean-Michaël Celerier <jeanmichael.celerier at gmail dot com> changed:

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--- Comment #3 from Jean-Michaël Celerier <jeanmichael.celerier at gmail dot com> ---
As a Clang user, -Weverything allowed me to remove terrible bugs that would not
crop up with -Wall -Wextra -Wfew-other-common-warnings.

For instance GCC 6 brings in many new warnings it seems. Well, it is a pity to
have to go through the manual to find the new warnings and enable them by hand
(very few people will actually do this, while it could certainly make some bugs
appear. Maybe it could prevent the next Heartbleed ?).