Date: Tue, 20 Aug 2019 21:36:05 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Mateusz Guzik <mjguzik@gmail.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: funny pathname lookups from the compiler Message-ID: <45A65685-12A1-4A30-A5F0-89AF108D972F@FreeBSD.org> In-Reply-To: <CAGudoHE1HVqKVjXCVLEBbSeXVvrSLLHFwJL%2BGhTHuE5BA0cjjA@mail.gmail.com> References: <CAGudoHE1HVqKVjXCVLEBbSeXVvrSLLHFwJL%2BGhTHuE5BA0cjjA@mail.gmail.com>
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On 20 Aug 2019, at 20:24, Mateusz Guzik <mjguzik@gmail.com> wrote:
>
> Interested parties can collect this on their own:
>
> dtrace -n 'vfs:namei:lookup:entry /execname == "ld.lld" || execname ==
> "cc"/ { @[stringof(arg1)] = count(); }'
>
> and cc hello.c or similar elsewhere.
>
> Full list is here:
> http://dpaste.com/2YM1R41
>
> Highlights of fishy entries for me:
> /proc/self/fd 1
> /etc/SuSE-release 3
> /etc/alpine-release 3
> /etc/arch-release 3
> /etc/debian_version 3
> /etc/exherbo-release 3
> /etc/gentoo-release 3
> /etc/lsb-release 3
> /etc/malloc.conf 3
> /etc/redhat-release 3
>
> I don't know this code but I strongly suspect most of this can be easily
> ifdef-ed out. The first one perhaps can be disabled with a switch to
> configure.
>
> None of this is a significant problem of course, but it does look like a
> waste.
Yes, it is an annoying detail of the Distro class in
contrib/llvm/tools/clang/lib/Driver/Distro.cpp, where it is trying to
look up the "distro", since Linux makes that so very very easy. :-)
I would recommend filing an upstream bug report at
https://bugs.llvm.org/, and/or submit a patch at
https://reviews.llvm.org/.
-Dimitry
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