http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59436
--- Comment #18 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #16)
> The bad run has
>
> open("x86_64-unknown-linux-gnu/bits/stdc++.h.gch/O2ggnu++0x.gch",
> O_RDONLY|O_NOCTTY) = 5
> fstat(5, {st_mode=S_IFREG|0644, st_size=78195440, ...}) = 0
>
> The good runs don't do mmap on PCH file.
It is because I used stage 2 cc1plus on PCH file generated by stage 3
cc1plus.
