Tautological comparison in gcc 6.1.1

Andrew Bartlett abartlet at samba.org
Wed Jul 13 10:08:08 UTC 2016


On Wed, 2016-07-13 at 21:57 +1200, Andrew Bartlett wrote:
> On Wed, 2016-07-13 at 14:21 +1000, Amitay Isaacs wrote:
> 
> > Reviewed-by: me.
> > 
> > Let's wait and see if anyone has a better idea.
> > 
> > Amitay.
> 
> Build some files with -Wno-tautological-compare?
> 
> The problem with the solutions I've seen proposed is that they just
> wait for the compiler to get smarter, or the -O level to be raised,
> and
> then we are back where we started.  It also makes elegant code less
> -elegant.
> 
> I know there are advantages to finding these things elsewhere, but it
> frustrates me when changes like this are need (mostly the follow-up
> patches, if we just had to change the inside of the macros I wouldn't
> mind so much). 

Relevant links:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54979
https://gcc.gnu.org/wiki/FAQ#The_warning_.22unrecognized_command-line_option.22_is_not_given_for_-Wno-foo
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62095

(to save others time).  I don't know if this is any more practical however.

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba






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