Fedora core 11 and UML kernel compile

Hello,
I think I am not the first to have this problem, but just to remind people of this problem:
Fedora 11 cannot compile uml kernels (2.6.29.4 and 2.6.30), here is the error:
. . .
. . .

  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1

/usr/bin/ld:arch/um/kernel/vmlinux.lds:1: ignoring invalid character `#' in expression
/usr/bin/ld:arch/um/kernel/vmlinux.lds:1: syntax error
collect2: ld returned 1 exit status
KSYM .tmp_kallsyms1.S
nm: '.tmp_vmlinux1': No such file
No valid symbol.
make: *** [.tmp_kallsyms1.S] Error 1

I have no knowledge at all of kernel compilation, so I have no idea how to get it compiled.

Note with no link to the above problem:
I have made a virtual network creation software using UML at
http://clownix.net and with it you can mix UML and KVM machines and on this emulated network UML is MUCH faster as far as emulated ethernet interfaces are concerned.

On both machines, a socket is used to get into the machine ethernet emulated interface, and as the KVM emulates real hardware (interrupts and so-on) the throughput bandwidth is affected.
The strange thing that the "para-virtualization" of KVM ethernet interfaces only had very little effect and did not bring it much closer to the UML throughput.
So I say to UML users: have no fear of KVM, UML is still the best product to have a virtual linux over linux.

Regards

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Hi,

The root cause of the problem is a change in the behavior of the bash. Fedora 11 uses bash 4 which does not pass environmental variables containing "." to sub-processes. Since the kernel's Makefiles rely on this feature, the mentioned error occurs.

Right now there is a discussion on the bash's mailing list whether this behavior is correct or not:
http://lists.gnu.org/archive/html/bug-bash/2009-06/msg00078.html

So it is unclear right now whether the problem should be fixed in the bash, in make or in the kernel's Makefiles. Let's see what's the outcome of the discussion with the bash developers.

Best regards,
Christian

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