[jepler]

There must still be some dark pointer magic going on, because I noticed that unless I disabled ASLR on Debian Stretch, each build of a precompiled header came out different, screwing up ccache. I can only conclude that the specific memory layout during an individual run influences the specific precompiled header (".gch") output. We now run our build process under 'setarch x86_64 --addr-no-randomize.

[jepler]

    $ for i in `seq 3`; do gcc-6 -x c-header /dev/null -o x.h.gch; sha256sum x.h.gch; done
    98d8093503565836ba6f35b7adf90330d63d9d1c76dfb8e3ad1aeb2d933d1a45  x.h.gch
    17e5de099860d94aaa468c5ad103b3f0dd5e663f6cdbd01b4f12cf210023e71c  x.h.gch
    3cc2f1c0a517b5fedbbd49bb3a34084d9aa1428f33f3c30278a8c61f9ed9ba88  x.h.gch