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[Qemu-devel] [Bug 1193628] Re: Undefined References


From: Michael Tokarev
Subject: [Qemu-devel] [Bug 1193628] Re: Undefined References
Date: Sun, 23 Jun 2013 05:36:05 -0000

This is a change in glibc.  Since version 2.17, clock_gettime() and
friends were moved from -lrt to the main libc, so for linking with
clock_gettime(), -lrt isn't needed anymore.

However, (old) qemu configure only checked clock_gettime(), and used
other functions like timer_create() &Co above.

There was a patch:

commit 8bacde8d86a09699207d85d4bab06162aed18dc4
Author: Natanael Copa <address@hidden>
Date:   Wed Sep 12 09:06:51 2012 +0000

    configure: properly check if -lrt and -lm is needed
    
    Fixes build against uClibc.

    uClibc provides 2 versions of clock_gettime(), one with realtime
    support and one without (this is so you can avoid linking in -lrt
    unless actually needed). This means that the clock_gettime() don't
    need -lrt. We still need it for timer_create() so we check for this
    function in addition.
    
    We also need check if -lm is needed for isnan().
    
    Both -lm and -lrt are needed for libs_qga.

which was applied past qemu-1.2, so 1.4 and 1.5 versions have it, and
_should_ work fine.

Thanks,

/mjt

-- 
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https://bugs.launchpad.net/bugs/1193628

Title:
  Undefined References

Status in QEMU:
  New

Bug description:
  I've been able to make qemu on ubuntu 13.04 for all last releases:
  1.4.0 -> 1.5.0

  Unfortunately, when I launch one of them with a Cisco ASA, it crashes inside 
GNS3 (latest release) for Ubuntu.
  The top GNS3 developer told me they experienced similar results and advised 
me to use qemu 1.1.0.

  The problem is that I cannot link that version. I always have these errors:
   
  "LINK  qemu-ga
  qemu-timer.o: In function `dynticks_rearm_timer':
  /home/actionmystique/Downloads/qemu-1.1.0/qemu-timer.c:538: undefined 
reference to `timer_gettime'
  /home/actionmystique/Downloads/qemu-1.1.0/qemu-timer.c:551: undefined 
reference to `timer_settime'
  qemu-timer.o: In function `dynticks_stop_timer':
  /home/actionmystique/Downloads/qemu-1.1.0/qemu-timer.c:524: undefined 
reference to `timer_delete'
  qemu-timer.o: In function `dynticks_start_timer':
  /home/actionmystique/Downloads/qemu-1.1.0/qemu-timer.c:510: undefined 
reference to `timer_create'
  collect2: error: ld returned 1 exit status
  make: *** [qemu-ga] Error 1"

  The man pages say we need to link with '-lrt' option, but I could not find it 
in the Makefile.
  I do not know how to correct this issue.

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