[Pkg-uml-pkgs] Bug#491921: user-mode-linux: FTBFS on amd64 -- no more __memcpy with gcc 4.3

[Aaron M. Ucko]

Package: user-mode-linux
Version: 2.6.25-1um-1
Severity: serious
Tags: patch
Justification: no longer builds from source

user-mode-linux fails to build on amd64 with the following error:

|   CC      arch/um/sys-x86_64/ksyms.o
| arch/um/sys-x86_64/ksyms.c:16: error: '__memcpy' undeclared here (not in a function)
| arch/um/sys-x86_64/ksyms.c:16: warning: type defaults to 'int' in declaration of '__memcpy'
| make[2]: *** [arch/um/sys-x86_64/ksyms.o] Error 1
| make[1]: *** [arch/um/sys-x86_64] Error 2

The problem is that arch/um/sys-x86_64/ksyms.c unconditionally tries
to export __memcpy even though include/asm-x86/string_64.h declares it
only for GCC 4.2 and older, newer versions presumably being smart
enough not to need it.  I'm attaching a patch that conditionalizes the
EXPORT_SYMBOL call accordingly, and have confirmed that it allows the
build to complete without errors.  (FTR, arch/um/os-Linux/user_syms.c
already exports memcpy itself, so ksyms.c need not do so in any case.)

FWIW, you can find a full log illustrating the error at
http://buildd.debian.org/fetch.cgi?pkg=user-mode-linux;ver=2.6.25-1um-1;arch=amd64;stamp=1216481207

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.25.11 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash
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