[Qemu-devel] [Bug 955379] Re: cmake hangs with qemu-arm-static

[Peter Maydell <peter.maydell@linaro.org>]

What cmake is doing is an entirely legitimate and well-recognized Unix
idiom for converting signals into effects on filedescriptors for
select(), and there's no reason for them to change it. This is
absolutely a bug in QEMU, it's just one that's not easy for us to fix.
(Using socketpair would not help here. You'd have to use signalfd(),
which of course is much less portable.)

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https://bugs.launchpad.net/bugs/955379

Title:
  cmake hangs with qemu-arm-static

Status in QEMU:
  Confirmed
Status in Linaro QEMU:
  Confirmed
Status in “qemu-linaro” package in Ubuntu:
  Confirmed

Bug description:
  I'm using git commit 3e7ecd976b06f... configured with --target-list
  =arm-linux-user --static in a chroot environment to compile some
  things. I ran into this problem with both pcl and opencv-2.3.1. cmake
  consistently freezes at some point during its execution, though in a
  different spot each time, usually during a step when it's searching
  for some libraries. For instance, pcl most commonly stops after:

  [snip]
  -- Boost version: 1.46.1
  -- Found the following Boost libraries:
  --   system
  --   filesystem
  --   thread
  --   date_time
  -- checking for module 'eigen3'
  --   found eigen3, version 3.0.1

  which is perplexing because it freezes after finding what it wants,
  not during the search. When it does get past that point, it does so
  almost immediately but freezes somewhere else.

  I'm using 64-bit Ubuntu 11.10 with kernel release 3.0.0-16-generic
  with an Intel i5.

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