The build for i686-gnu also fails using GCC 6 branch with 
build-many-glibcs.py:

hurdsig.c: In function 'interrupted_reply_port_location.isra.1':
hurdsig.c:250:39: error: 'portloc' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
   *(volatile mach_port_t *) portloc = *portloc;
                                       ^~~~~~~~

I haven't investigated whether this warning is valid, or whether it's 
bogus (in which case we don't add initializations just to fix warnings, 
but may used DIAG_*_NEEDS_COMMENT with appropriate explanations of what 
warning appears and why it is bogus).

-- 
Joseph S. Myers
jos...@codesourcery.com

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