3.3: 2nd build fails with asm/unistd_64.h: No such file or directory

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Hi folks,

If I build 3.3 _again_ from the same source tree, then I get a problem about a missing asm/unistd_64.h. Here is a sample session:

% make -C /export/git/linux-source O=/export/tmp/build_kernel/build clean
make: Entering directory `/export/git/linux-source'
CLEAN .
CLEAN .tmp_versions
make: Leaving directory `/export/git/linux-source'
% make -C /export/git/linux-source clean
make: Entering directory `/export/git/linux-source'
make: Leaving directory `/export/git/linux-source'
% make -C /export/git/linux-source O=/export/tmp/build_kernel/build oldconfig
make: Entering directory `/export/git/linux-source'

  HOSTCC  scripts/basic/fixdep
  GEN     /export/tmp/build_kernel/build/Makefile
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf --oldconfig Kconfig
#
# configuration written to .config
#
make: Leaving directory `/export/git/linux-source'
% make -C /export/git/linux-source O=/export/tmp/build_kernel/build
make: Entering directory `/export/git/linux-source'
  GEN     /export/tmp/build_kernel/build/Makefile
scripts/kconfig/conf --silentoldconfig Kconfig
make[2]: Nothing to be done for `all'.
  Using /export/git/linux-source as source for kernel
  GEN     /export/tmp/build_kernel/build/Makefile
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      kernel/bounds.s
  GEN     include/generated/bounds.h
  CC      arch/x86/kernel/asm-offsets.s
In file included from /export/git/linux-source/include/linux/unistd.h:7:0,
                 from /export/git/linux-source/arch/x86/include/asm/seccomp_64.h:4,
                 from /export/git/linux-source/arch/x86/include/asm/seccomp.h:4,
                 from /export/git/linux-source/include/linux/seccomp.h:8,
                 from /export/git/linux-source/include/linux/sched.h:80,
                 from /export/git/linux-source/arch/x86/kernel/asm-offsets.c:9:
/export/git/linux-source/arch/x86/include/asm/unistd.h:16:29: fatal error: asm/unistd_64.h: No such file or directory
compilation terminated.
make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
make[1]: *** [prepare0] Error 2
make: *** [sub-make] Error 2
make: Leaving directory `/export/git/linux-source'

AFAICS asm/unistd_64.h was generated in the source directory, even though I explicitly specified a separate build directory. Is this expected?

There was no such problem for 3.2.12 and older. "git clean -dfx" seems to help.

Regards

Harri
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