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Re: [Qemu-trivial] [PATCH v2] configure: Put tempfiles in a subdir of th

From: Michael Tokarev
Subject: Re: [Qemu-trivial] [PATCH v2] configure: Put tempfiles in a subdir of the build directory
Date: Sat, 24 May 2014 00:35:01 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0

23.05.2014 20:07, Peter Maydell wrote:
> When libtool support was added to configure, the new temporary files
> were left out of the list of files cleaned up on exit; this results
> in a lot of stale .lo files being left around in /tmp. Worse, libtool
> creates a /tmp/.libs directory which we can't easily clean up.
> Put all our temporary files in a single temporary directory created
> as a subdirectory of the build directory, so we can easily clean it up,
> and don't need fragile or complicated code for creation to avoid it
> clashing with temporary directories from other instances of QEMU
> configure or being subject to attack from adversaries who can write
> to /tmp.
> Since the temporaries now live in the build tree, we have no
> need to jump through hoops with a trap handler to try to remove
> them when configure exits; this fixes some weird bugs where hitting
> ^C during a configure run wouldn't actually make it stop, because
> we would run the trap handler but then not stop. (It is possible
> to get the trap handler semantics right but it is convoluted largely
> because of bugs in dash, so it is simpler to just avoid it.)
> Note that "temporary files go in the build directory, not /tmp" is
> the way autoconf behaves.
> Signed-off-by: Peter Maydell <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>


Applied to -trivial, thank you for doing this!


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