[Buildroot] systemd: build failure against pam on arm

[Christian Stewart <christian@paral.in>]

Hi Waldemar,

Waldemar Brodkorb <wbx@openadk.org> writes:
>> There are no extra pam files in my Buildroot tree - before building I
>> ensure this with a "git clean -xfd" and I've searched the tree as well.
>
> But that is strange then.
> find . -name libpam_misc.so\*
> ./output/build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so.0
> ./output/build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so
> ./output/build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so.0.82.1

... please note that I am building out of tree. There are no
limpam_misc* inside the "buildroot tree" which includes the main source
tree. When the compilation fails, inside my "output tree":

  $ find -name "libpam_misc.so*"
  ./build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so
  ./build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so.0
  ./build/linux-pam-1.3.0/libpam_misc/.libs/libpam_misc.so.0.82.1
  ./target/usr/lib/libpam_misc.so
  ./target/usr/lib/libpam_misc.so.0
  ./target/usr/lib/libpam_misc.so.0.82.1
  ./host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libpam_misc.so
  ./host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libpam_misc.so.0
  ./host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libpam_misc.so.0.82.1

> Systemd wants to find libpam, if it is not there it seems to
> fallback to your native libpam.

Clearly, then, it is not finding the "./target/usr/lib/libpam_misc.so"
in "out-of-tree" build.

> You should always run "make clean && make" if you make any
> changes to your .config.

...I do...

Best,
Christian