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