Comment 16 for bug 669641

Building against precise is interesting, at first we thought (ayan and myself) that
we were modifying the same object twice which results in an error. To remedy
that, sort -u was added to the processing loop. After another precise build
with that precaution we get this failure.

  MKDIR /home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug/lib/firmware/yam
  INSTALL debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug/lib/firmware/yam/1200.bin
  INSTALL debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug/lib/firmware/yam/9600.bin
  DEPMOD 3.2.0-26-generic
make[1]: Leaving directory `/home/ppetraki/ubuntu-precise'
# Add .gnu_debuglink sections to each stripped .ko
# pointing to unstripped verson
find /home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic -name '*.ko' | sed 's|/home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic||'| sort -u | while read module ; do \
  objcopy \
   --add-gnu-debuglink=/home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug/$module \
   /home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic/$module; \
 done
objcopy:/home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic//lib/modules/3.2.0-26-generic/initrd/sttHRG8l: cannot fill debug link section `/home/ppetraki/ubuntu-precise/debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug//lib/modules/3.2.0-26-generic/initrd/vesafb.ko': No such file or directory
make: *** [install-generic] Error 1

There is no "initrd" dir in the debug symbols tree

on an installed system...
root@ubuntu:~# find /usr/lib/debug -name vesafb.ko
/usr/lib/debug/lib/modules/3.2.0-23-generic/kernel/drivers/video/vesafb.ko

back to the build.

./debian/build/build-generic/drivers/video/vesafb.ko
./debian/linux-image-3.2.0-26-generic-dbgsym/usr/lib/debug/lib/modules/3.2.0-26-generic/kernel/drivers/video/vesafb.ko
./debian/linux-image-3.2.0-26-generic/lib/modules/3.2.0-26-generic/kernel/drivers/video/vesafb.ko
./debian/linux-image-3.2.0-26-generic/lib/modules/3.2.0-26-generic/initrd/vesafb.ko

ppetraki@tangerine:~/ubuntu-precise$ cmp ./debian/linux-image-3.2.0-26-generic/lib/modules/3.2.0-26-generic/kernel/drivers/video/vesafb.ko ./debian/linux-image-3.2.0-26-generic/lib/modules/3.2.0-26-generic/initrd/vesafb.ko
ppetraki@tangerine:~/ubuntu-precise$ echo $?
0

Perhaps we should attempt this sections update earlier in the build? Or we may have to get smarter
about evaluating our destination arg for --add-gnu-debuglink=${...}.