[uml-devel] Build failure on new gcc-6 on Debian Sid

[Ritesh Raj Sarraf <rrs@researchut.com>]

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Hi,

On Debian Sid (Unstable), with Linux version 4.8.11, I was hopeful that uml
would build proper with gcc-6. But I still am getting the below mentioned build
failure.

The 4.8.11 kernel has the fixes for the core kernel. I'm not sure if any extra
changes are needed for UM again.

The current workaround that we use in Debian to build latest UML bits from the
kernel source, is to use the gcc-5 compiler.

The Debian bug report is accessible at:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=837579

Thanks,
Ritesh


The fix that went in the stable release is:
http://git.kernel.org/cgit/linux/kernel/git/stable/stable-queue.git/commit/?id=a
fad7e0e67ef545a4d92507a236f0666c33d3ad4

  CC [M]  lib/cordic.o
  CC [M]  lib/asn1_decoder.o
  GEN     lib/oid_registry_data.c
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_IN:en",
        LC_ALL = (unset),
        LC_TIME = "en_IN.utf8",
        LC_MONETARY = "en_IN.utf8",
        LC_COLLATE = "C",
        LC_MEASUREMENT = "en_IN.utf8",
        LC_NUMERIC = "C",
        LC_PAPER = "en_IN.utf8",
        LANG = "C"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
  CC [M]  lib/oid_registry.o
  LD      virt/lib/built-in.o
  LD      virt/built-in.o
  LINK    vmlinux
  LD      vmlinux.o
  MODPOST vmlinux.o
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  LD      init/built-in.o
/usr/bin/ld: arch/um/drivers/built-in.o: relocation R_X86_64_32 against
`.rodata.str1.1' can not be used when making a shared object; recompile with
-fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
Makefile:955: recipe for target 'vmlinux' failed
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory '/build/user-mode-linux-4.8-1um/linux-source-4.8'
debian/rules:76: recipe for target 'build-stamp' failed
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
I: copying local configuration
E: Failed autobuilding of package
I: unmounting /var/tmp/lxc/ccache/ccache filesystem
I: unmounting /var/cache/apt/archives/ filesystem
I: unmounting dev/pts filesystem
I: unmounting run/shm filesystem
I: unmounting proc filesystem
I: unmounting sys filesystem
I: cleaning the build env
I: removing directory /var/tmp/Debian-Build/Build//25270 and its subdirectories
23:15 ♒♒♒    ☹  => 1  
rrs@chutzpah:~/Community/Packaging/user-mode-linux (master)$



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