qemu-linaro: compile fail on sparc: epoll_create not present

[Peter Maydell]

http://launchpadlibrarian.net/65850766/buildlog_ubuntu-lucid-sparc.qemu-linaro_0.14.50-2011.03-0-0ubuntu1~ppa10.04.1_FAILEDTOBUILD.txt.gz

  CC i386-linux-user/syscall.o
cc1: warnings being treated as errors
/build/buildd/qemu-linaro-0.14.50-2011.03-0/linux-user/syscall.c: In function 'do_syscall':
/build/buildd/qemu-linaro-0.14.50-2011.03-0/linux-user/syscall.c:7630: error: implicit declaration of function 'epoll_create1'
/build/buildd/qemu-linaro-0.14.50-2011.03-0/linux-user/syscall.c:7630: error: nested extern declaration of 'epoll_create1'

Not sure what's happening here -- configure is supposed to test for the presence of epoll_create1() but it doesn't seem to be working for some reason.

[Peter Maydell (pmaydell)]

This might be the result of this bug in the SPARC libc:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=576826

where it isn't getting the declaration/definition of the epoll functions right.

[Peter Maydell (pmaydell)]

I've attached a patch to configure which I think ought to fix this -- Steve, can you give it a go on a Lucid SPARC box?

[Steve Langasek (vorlon)]

Tested on the Ubuntu sparc porter machine in the lucid chroot; definitely gets past the earlier build failure. Letting the build run to check whether it completes ok.

[Steve Langasek (vorlon)]

Whoops. Subsequent failure:

  CC arm-linux-user/main.o
In file included from /home/vorlon/qemu-linaro-0.14.50-2011.03-1/linux-user/qemu.h:82,
                 from /home/vorlon/qemu-linaro-0.14.50-2011.03-1/linux-user/main.c:29:
/home/vorlon/qemu-linaro-0.14.50-2011.03-1/linux-user/arm/nwfpe/fpa11.h:114:1: error: "REG_PC" redefined
In file included from /usr/include/signal.h:359,
                 from /home/vorlon/qemu-linaro-0.14.50-2011.03-1/linux-user/qemu.h:4,
                 from /home/vorlon/qemu-linaro-0.14.50-2011.03-1/linux-user/main.c:29:
/usr/include/sys/ucontext.h:97:1: error: this is the location of the previous definition
make[3]: *** [main.o] Error 1
make[2]: *** [subdir-arm-linux-user] Error 2
make[2]: Leaving directory `/home/vorlon/qemu-linaro-0.14.50-2011.03-1/user-build'

[Peter Maydell (pmaydell)]

I've attached a patch which ought to fix the second compile failure (by renaming the qemu constant to something else).

I've also submitted the configure patch upstream.

[Peter Maydell (pmaydell)]

Steve: you could also try pulling qemu-linaro from git and building that, as I've just put in both these patches.

[Steve Langasek (vorlon)]

Confirmed that with both patches applied, qemu-linaro builds on sparc/lucid. Thanks!