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I'm trying build xen in 32bit system with 64 bit kernel booted (ia32
emulation), but it fails with errors:

# emerge xen
Calculating dependencies... done!
>>> Emerging (1 of 1) app-emulation/xen-3.0.2 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking xen-3.0.2-src.tgz ;-)
>>> Unpacking source...
>>> Unpacking xen-3.0.2-src.tgz to /var/tmp/portage/xen-3.0.2/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/xen-3.0.2/work/xen-3.0.2 ...
make: Entering directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
make -C tools
make[1]: Entering directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools'
make -C figlet
make[2]: Entering directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools/figlet'
gcc -o figlet figlet.c
make[2]: Leaving directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools/figlet'
make symbols
make[2]: Entering directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools'
gcc -Wall -Werror -Wstrict-prototypes -O2 -fomit-frame-pointer
-Wdeclaration-after-statement -o symbols symbols.c
make[2]: Leaving directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools'
make[1]: Leaving directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/tools'
make include/xen/compile.h
make[1]: Entering directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
tools/figlet/figlet -d tools/figlet Xen 3.0.2 > include/xen/banner.h.new
 __  __            _____  ___   ____
 \ \/ /___ _ __   |___ / / _ \ |___ \
  \  // _ \ '_ \    |_ \| | | |  __) |
  /  \  __/ | | |  ___) | |_| | / __/
 /_/\_\___|_| |_| |____(_)___(_)_____|

make[1]: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
make include/xen/acm_policy.h
make[1]: Entering directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
make[1]: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
[ -e include/asm ] || ln -sf asm-x86 include/asm
make -C arch/x86 asm-offsets.s
make[1]: Entering directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/arch/x86'
gcc -O2 -fomit-frame-pointer -DNDEBUG -m64 -Wall -Wstrict-prototypes
-Wdeclaration-after-statement -nostdinc -fno-builtin -fno-common
-fno-strict-aliasing -iwithprefix include -Werror -Wno-pointer-arith -pipe
-I/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/include
-I/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/include/asm-x86/mach-generic
-I/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/include/asm-x86/mach-default
-msoft-float -mno-red-zone -fpic -fno-reorder-blocks
-fno-asynchronous-unwind-tables -g -D__XEN__ -S -o asm-offsets.s
x86_64/asm-offsets.c
x86_64/asm-offsets.c:1: sorry, unimplemented: 64-bit mode not compiled in
x86_64/asm-offsets.c: In function `__dummy__':
x86_64/asm-offsets.c:29: error: structure has no member named `r15'
x86_64/asm-offsets.c:30: error: structure has no member named `r14'
x86_64/asm-offsets.c:31: error: structure has no member named `r13'
x86_64/asm-offsets.c:32: error: structure has no member named `r12'
x86_64/asm-offsets.c:33: error: structure has no member named `rbp'
x86_64/asm-offsets.c:34: error: structure has no member named `rbx'
x86_64/asm-offsets.c:35: error: structure has no member named `r11'
x86_64/asm-offsets.c:36: error: structure has no member named `r10'
x86_64/asm-offsets.c:37: error: structure has no member named `r9'
x86_64/asm-offsets.c:38: error: structure has no member named `r8'
x86_64/asm-offsets.c:39: error: structure has no member named `rax'
x86_64/asm-offsets.c:40: error: structure has no member named `rcx'
x86_64/asm-offsets.c:41: error: structure has no member named `rdx'
x86_64/asm-offsets.c:42: error: structure has no member named `rsi'
x86_64/asm-offsets.c:43: error: structure has no member named `rdi'
x86_64/asm-offsets.c:46: error: structure has no member named `rip'
x86_64/asm-offsets.c:49: error: structure has no member named `rsp'
x86_64/asm-offsets.c:63: error: structure has no member named
`syscall_callback_eip'
make[1]: *** [asm-offsets.s] Error 1
make[1]: Leaving directory
`/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/arch/x86'
make: *** [/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/xen] Error 2
make: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'

!!! ERROR: app-emulation/xen-3.0.2 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_compile
  ebuild.sh, line 939:   Called src_compile
  xen-3.0.2.ebuild, line 60:   Called die

command:
# XEN_TARGET_ARCH="x86_32" emerge xen
solves this problem

xen-tools have the same problem

Sven, are you in a position to duplicate this with your amd64 hardware? I only
have x86.

Sure, I just need to set up a 32bit domain, but I'm pretty sure I don't need to
do it. The xen packages use uname -m to find the architecture, which in case of
a 64bit kernel will be x86_64, for which a 32bit system can't compile code.

Pretty simple and straightforward fix is to force XEN_TARGET_ARCH to the
correct value, as tonich did on the command line. I'm thinking about code like
the following:

--- xen-3.0.2.ebuild.orig       2006-08-16 06:48:16.000000000 +0000
+++ xen-3.0.2.ebuild    2006-08-16 07:03:36.000000000 +0000
@@ -25,6 +25,21 @@

 RESTRICT="test"

+pkg_setup() {
+       if [[ -z ${XEN_TARGET_ARCH} ]]
+       then
+               if use x86
+               then
+                       export XEN_TARGET_ARCH="x86_32"
+               elif use amd64
+               then
+                       export XEN_TARGET_ARCH="x86_64"
+               else
+                       die "Unsupported architecture!"
+               fi
+       fi
+}
+
 src_unpack() {
        unpack ${A}
        # if the user *really* wants to use their own custom-cflags, let them

Another thing might be to integrate complete cross-compile support into the
packages. I haven't tried to cross-compile the beast on x86 for amd64, which
might be worth a shot.

Fixed in app-emulation/xen-3.0.2 without a bump, since the other change
intended for -r1 (#147876) was scrapped.

Fixed in app-emulation/xen-tools-3.0.2-r4, thanks.