Re: [Xen-devel] xen 4.2.0-rc3-pre: building failure on alpine linux / uclibc

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Roger should have a better idea than me but he is currently on vacation.

On Fri, 10 Aug 2012, Mark van Dijk wrote:
> After someone suggested alpine linux makes a nice dom0 system I decided
> to give it a go. Unfortunately the build process breaks:
> 
> ---
>   AR    i386-dm/libqemu.a
>   LINK  i386-dm/qemu-dm
> vl.o: In function `dynticks_stop_timer':
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir/vl.c:1603:
> undefined reference to `timer_delete' vl.o: In function
> `dynticks_start_timer': 
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir/vl.c:1585:
> undefined reference to `timer_create' vl.o: In function
> `dynticks_rearm_timer': 
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir/vl.c:1620:
> undefined reference to
> `timer_gettime' 
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir/vl.c:1633:
> undefined reference to `timer_settime' collect2: ld returned 1 exit
> status make[4]: *** [qemu-dm] Error 1 make[4]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir-remote/i386-dm'
> make[3]: *** [subdir-i386-dm] Error 2 make[3]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-traditional-dir-remote'
> make[2]: *** [subdir-install-qemu-xen-traditional-dir] Error 2 make[2]:
> Leaving directory `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools'
> make[1]: *** [subdirs-install] Error 2 make[1]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools' make: ***
> [install-tools] Error 2 ---
> 
> I found this bug occurred to someone back in february '12 when someone
> posted the following message and patch to the ML:
> 
> http://lists.xen.org/archives/html/xen-devel/2012-02/msg01475.html
> 
> But I am either not patching the correct file or this patch is not
> working. I was trying a couple of different solutions just to see how I
> could get it to work but I'll admit this is like doing rocket science
> as a third grader. This is what I tried next to the previously named
> patch:
> 
> http://pastebin.com/U39H38T7
> 
> But the end result:
> 
> ---
>   LINK  qemu-ga
>   CC    libdis/i386-dis.o
>   LINK  qemu-nbd
> cutils.o: In function `strtosz_suffix_unit':
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-dir/cutils.c:354:
> undefined reference to `__isnan'
> /adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-dir/cutils.c:357:
> undefined reference to `modf'
> collect2: ld returned 1 exit status
> make[3]: *** [qemu-ga] Error 1
> make[3]: *** Waiting for unfinished jobs....
> make[3]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools/qemu-xen-dir-remote'
> make[2]: *** [subdir-all-qemu-xen-dir] Error 2
> make[2]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools'
> make[1]: *** [subdirs-install] Error 2
> make[1]: Leaving directory
> `/adm/anderson/xen-unstable/src/xen-git-4.2.0/tools'
> make: *** [install-tools] Error 2
> ---
> 
> Where do I go from here?

This is upstream QEMU that is breaking, not qemu-xen-traditional (see
the code path: qemu-xen-dir-remote instead of
qemu-xen-traditional-dir-remote). Moreover it is breaking compiling
qemu-nbd that we aren't currently using.
I would try out the following change to the configure script:


diff --git a/configure b/configure
index 027a718..9cc8e19 100755
--- a/configure
+++ b/configure
@@ -2614,11 +2613,7 @@ cat > $TMPC <<EOF
 int main(void) { return clock_gettime(CLOCK_REALTIME, NULL); }
 EOF
 
-if compile_prog "" "" ; then
-  :
-elif compile_prog "" "-lrt" ; then
-  LIBS="-lrt $LIBS"
-fi
+LIBS="-lrt -lm $LIBS"
 
 if test "$darwin" != "yes" -a "$mingw32" != "yes" -a "$solaris" != yes -a \
         "$aix" != "yes" -a "$haiku" != "yes" ; then

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