[Buildroot] [Bug 4958] New: Qt 4.7.4 build crashes with Linux 2.6.29

[Buildroot] [Bug 4958] New: Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

              Host: x86_64
            Target: arm
           Summary: Qt 4.7.4 build crashes with Linux 2.6.29
           Product: buildroot
           Version: 2012.02
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: jeremie.scheer at armadeus.com
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


I'm using Linux 2.6.29.6 kernel and headers and I compile rootfs for ARM.

When Qt is being compiled, it crashed on this error:

linking ../../lib/libQtNetwork.so.4.7.4
.obj/debug-shared-emb-arm/qnativesocketengine_unix.o: In function
`qt_safe_accept':
/srv/developpements/armadeus_4-1/buildroot/output/build/qt-4.7.4/src/network/../../include/QtNetwork/private/../../../src/network/socket/qnet_unix_p.h:121:
undefined reference to `accept4'
.obj/debug-shared-emb-arm/qlocalserver_unix.o: In function `qt_safe_accept':
/srv/developpements/armadeus_4-1/buildroot/output/build/qt-4.7.4/src/network/socket/qnet_unix_p.h:121:
undefined reference to `accept4'
collect2: ld returned 1 exit status
make[3]: *** [../../lib/libQtNetwork.so.4.7.4] Error 1
make[3]: Leaving directory
`/srv/developpements/armadeus_4-1/buildroot/output/build/qt-4.7.4/src/network'
make[2]: *** [sub-network-make_default-ordered] Error 2
make[2]: Leaving directory
`/srv/developpements/armadeus_4-1/buildroot/output/build/qt-4.7.4'
make[1]: ***
[/srv/developpements/armadeus_4-1/buildroot/output/build/qt-4.7.4/.stamp_built]
Error 2
make[1]: Leaving directory `/srv/developpements/armadeus_4-1/buildroot'
make: *** [all] Error 2

The problem is that the function 'accept4' doesn't exist in Linux 2.6.29. It is
only defined in Linux 2.6.36 or more.
So when I rebuild all rootfs and Qt against Linux 2.6.38.8, it finished
successfully.

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[Buildroot] [Bug 4958] Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2012-03-21 12:27:37 UTC ---
There's not much we can do about this. Qt requires this accept4 system call,
which isn't available in 2.6.29, so it doesn't build if the kernel headers of
such kernel version are used.

What would like us to do here?

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[Buildroot] [Bug 4958] Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

--- Comment #2 from J?r?mie Scheer <jeremie.scheer@armadeus.com> 2012-03-21 14:40:11 UTC ---
Created attachment 4178
  --> https://bugs.busybox.net/attachment.cgi?id=4178
Omit accept4 when not supported by the kernel.

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[Buildroot] [Bug 4958] Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

--- Comment #3 from J?r?mie Scheer <jeremie.scheer@armadeus.com> 2012-03-21 14:43:52 UTC ---
Thank you for your answer. In fact, that's not really a Buildroot problem.
But I found a patch for uClibc that omits accept4 when the kernel version is
too old to support it.

If that can be of any help, I attached this patch to the bug.

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[Buildroot] [Bug 4958] Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

--- Comment #4 from Peter Korsgaard <jacmet@uclibc.org> 2012-03-21 22:16:17 UTC ---
(In reply to comment #3)

Do notice that just using new kernel headers is not enough if your kernel
doesn't handle sys_accept4. Qt is also not the only program using accep4, udev
is a another well known one.

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[Buildroot] [Bug 4958] Qt 4.7.4 build crashes with Linux 2.6.29

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4958

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX

--- Comment #5 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2012-04-23 21:54:59 UTC ---
Not a Buildroot bug per se: 2.6.29 is old now, and many userspace components
depend on system calls that have been added since then, and therefore recent
enough kernel headers are needed to build several userspace packages (qt, udev,
etc.)

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