Re: cross compiling xen/ia64

Alex Williamson writes ("[Xen-ia64-devel] cross
compiling xen/ia64"):
>    With the latest pull of the ia64 tree, it's now
possible, and fairly
> easy, to cross compile xen/ia64 on an x86_32/64 system.
 Aron Griffis
> has been working on this and has posted detailed
instructions on the Xen
> wiki: http
://wiki.xensource.com/xenwiki/CrossCompiling  These
> instructions are based on Fedora8, which should be
readily available.

I've been looking into this, and with Isaku Yamahata's patch
the
hypervisor does build.  I'm hoping we can get that wired
into the
staging propagation system very soon.  (Sorry about the
delay getting
round to this.)

However, neither the kernel nor the tools build for me.

The kernel build stops asking for a kernel config option:

  marineren-un
stable-2.hg> PATH=/usr/local/ia64/bin:$PATH make
XEN_TARGET_ARCH=ia64 CROSS_COMPILE=ia64-linux-gnu- -j4
dist-kernels
  for i in  linux-2.6-xen  ; do make $i-install || exit 1;
done
  ...
  *
  Xen hypervisor support (XEN) [Y/n/?] y
    Xen/IA64 exposure p2m table (XEN_IA64_EXPOSE_P2M)
[Y/n/?] (NEW) 

Obviously that's no good for an automatic test system.

The tools build stops with some kind of linker exec format
problem
which I admit I don't understand and haven't investigated:

  marineren-un
stable-2.hg> PATH=/usr/local/ia64/bin:$PATH make
XEN_TARGET_ARCH=ia64 CROSS_COMPILE=ia64-linux-gnu- -j4
dist-tools
  make -C tools install
  ...
  make[5]: Entering directory
`/u/iwj/work/xen-unstable-2.hg/tools/blktap/lib'
  ia64-linux-gnu-gcc -O2 -fomit-frame-pointer
-fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wno-unused-value -Wdeclaration-after-statement 
-D__XEN_TOOLS__ -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE  -I.
-I../../../tools/libxc -I../../../tools/include
-I../../../tools/xenstore -I../../../tools/include -Werror
-Wno-unused -fPIC -D _GNU_SOURCE
-Wp,-MD,.libblktap.so.3.0.0.d -Wl,-soname
-Wl,libblktap.so.3.0 -shared 
		   -L../../../tools/xenstore -lxenstore -o
libblktap.so.3.0.0 xenbus.opic blkif.opic xs_api.opic
 
/usr/local/ia64/lib/gcc/ia64-linux-gnu/4.1.1/../../../../ia6
4-linux-gnu/bin/ld: xenbus.opic: Relocations in generic ELF
(EM: 3)
 
/usr/local/ia64/lib/gcc/ia64-linux-gnu/4.1.1/../../../../ia6
4-linux-gnu/bin/ld: xenbus.opic: Relocations in generic ELF
(EM: 3)
  xenbus.opic: could not read symbols: File in wrong format
  collect2: ld returned 1 exit status
  make[5]: *** [libblktap.so.3.0.0] Error 1
  make[5]: Leaving directory
`/u/iwj/work/xen-unstable-2.hg/tools/blktap/lib'

This may be some problem with my cross building
installation.  I built
it roughly following the instructions on the wiki.  I used
the
prebuilt ia64 sys-root and did a single-stage build of
binutils 2.17
and gcc-4.1.1 with the following runes:

After unpacking the sysroot and mkaing a link to it at
/usr/ia64-linux-gnu/sys-root:

  cd binutils-2.17/
  ./configure --with-sysroot=/usr/ia64-linux-gnu/sys-root
--target=ia64-linux-gnu --prefix=/usr/local/ia64
  PATH=/usr/local/ia64/bin:$PATH make -j4
  PATH=/usr/local/ia64/bin:$PATH make install
  cd ..

  cd gcc-4.1.1/
  ./configure --with-sysroot=/usr/ia64-linux-gnu/sys-root
--with-headers=/usr/ia64-linux-gnu/sys-root/usr/include
--target=ia64-linux-gnu --prefix=/usr/local/ia64
--enable-languages=c
  PATH=/usr/local/ia64/bin:$PATH make -j4
  PATH=/usr/local/ia64/bin:$PATH make install

Ian.

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