freebsd stable - May 2012 - clang tautology

trying a clang buildworld and get a bunch of

/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcc/config/i386/i386.md:4249:29:
warning: self-comparison always evaluates to false [-Wtautological-compare]
        && (TARGET_64BIT || DImode != DImode))
                                   ^
12 warnings generated.

does not seem harmful, but cosmetically poor

randy

>
/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcc/config/i386/i386.md:4249:29:
warning: self-comparison always evaluates to false [-Wtautological-compare]
>         && (TARGET_64BIT || DImode != DImode))
>                                    ^
> 12 warnings generated.
apologies.  releng-9 just csupped

randy

and, for a bonus, clang buildworld ...

/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcc/config/i386/i386.md:196:14:
note: use '=' to turn this equality comparison into an assignment
(ix86_tune)) == (
             ^~
             
randy

and if i try to follow http://wiki.freebsd.org/BuildingFreeBSDWithClang
i do not see where the clang world and kernel are actually made the
normal bootable.

is the clang build for releng_9 for amd64 in good enough shape that i
can simply
  csup
  hack make.conf
  make buildworld
  make kernel
  boot single
  make installworld
  mergemaster -cviFU
  reboot

as if life was normal?

randy

On 2012-05-29 04:49, Randy Bush wrote:> trying a clang buildworld and get a
bunch of
> 
>
/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcc/config/i386/i386.md:4249:29:
warning: self-comparison always evaluates to false [-Wtautological-compare]
>         && (TARGET_64BIT || DImode != DImode))
>                                    ^
> 12 warnings generated.
> 
> does not seem harmful, but cosmetically poor
These are all warnings in gcc code that can be safely ignored.  They
will (most likely) never be fixed.  If you're bothered a lot by them, we
could crank down WARNS= for the gcc builds.