build issue in tests

[bhundven]

bryan@fuzzy:~/kdbus$ make
make -C /lib/modules/3.17.0-rc4+/build M=/home/bryan/kdbus                                                                   
make[1]: Entering directory '/home/bryan/build/linux'
  LD      /home/bryan/kdbus/built-in.o
  CC [M]  /home/bryan/kdbus/bus.o
  CC [M]  /home/bryan/kdbus/connection.o
  CC [M]  /home/bryan/kdbus/endpoint.o
  CC [M]  /home/bryan/kdbus/handle.o
  CC [M]  /home/bryan/kdbus/main.o
  CC [M]  /home/bryan/kdbus/match.o
  CC [M]  /home/bryan/kdbus/message.o
  CC [M]  /home/bryan/kdbus/metadata.o
  CC [M]  /home/bryan/kdbus/names.o
  CC [M]  /home/bryan/kdbus/notify.o
  CC [M]  /home/bryan/kdbus/domain.o
  CC [M]  /home/bryan/kdbus/policy.o
  CC [M]  /home/bryan/kdbus/pool.o
  CC [M]  /home/bryan/kdbus/queue.o
  CC [M]  /home/bryan/kdbus/util.o
  LD [M]  /home/bryan/kdbus/kdbus.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/bryan/kdbus/kdbus.mod.o
  LD [M]  /home/bryan/kdbus/kdbus.ko
make[1]: Leaving directory '/home/bryan/build/linux'
make -C test KERNELDIR=/home/bryan/build/linux KBUILD_MODNAME=kdbus
make[1]: Entering directory '/home/bryan/kdbus/test'
  TARGET_CC kdbus-enum.o
In file included from ../kdbus.h:23:0,
                 from kdbus-util.h:13,
                 from kdbus-enum.c:20:
/home/bryan/build/linux/include/uapi/linux/types.h:9:2: warning: #warning "Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders" [-Wcpp]
 #warning "Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders"
  ^
In file included from /home/bryan/build/linux/include/uapi/linux/posix_types.h:4:0,
                 from /home/bryan/build/linux/include/uapi/linux/types.h:13,
                 from ../kdbus.h:23,
                 from kdbus-util.h:13,
                 from kdbus-enum.c:20:
/home/bryan/build/linux/include/uapi/linux/stddef.h:1:28: fatal error: linux/compiler.h: No such file or directory
 #include <linux/compiler.h>
                            ^
compilation terminated.
Makefile:32: recipe for target 'kdbus-enum.o' failed
make[1]: *** [kdbus-enum.o] Error 1
make[1]: Leaving directory '/home/bryan/kdbus/test'
Makefile:27: recipe for target 'test' failed
make: *** [test] Error 2

With linus's tree at: 5874cfed0b04f53146f70a519a2371cea5f39178
And kdbus at: fa32cbd

[gregkh]

Have you built the kernel at /home/bryan/build/linux/ yet?
The tests have "issues" if you don't set up your kernel tree properly, best bet, install 3.17-rc on your machine and run the tests that way, you need to in order to be able to test the code at the moment anyway :)

[bhundven]

Yes, the 3.17-rc kernel was built and running when I did the kdbus build. I did the build with debian make-kpkg.

[gregkh]

I have no idea what the debian package does, but it looks like the kernel source headers aren't included properly somehow, sorry, you are on your own here.

[bhundven]

Ah, I see. I think I found a bug in kernel-package. Thanks!

[bhundven]

Actually, I spoke too soon. I get the same problems with fresh clones building by hand:

cd ~/build
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
cd linux
cp ../current.config .config
make oldconfig
make -j4 && sudo make modules_install && sudo make install
reboot

make install on debian will automatically build the initramfs and update the grub.cfg so next boot will be my new kernel.

cd ~/build
git clone https://github.com/gregkh/kdbus
make

and I am back to the same error in the OP.
So, maybe I need to bisect upstream to see where it broke?

[gregkh]

try 'make headers_install' and see if that helps. There was an email thread about these issues a few weeks ago on the systemd mailing list, I thought we figured out all the odd combinations, but I guess not,

[bhundven]

Ah-ha! Ok, so for both builds I've done, neither of them 'make headers_install' to the build directory.
The first build (with make-kpkg) makes a linux-headers package, and does symlink to the location of the installed headers in /lib/modules/<version>/{build,source}, but for some reason kdbus was looking at my actual build directory.

So running headers_install (without setting INSTALL_HDR_PATH) fixed the second build done by hand.
It does seem that the issue is either with the way that the upstream kernel installs headers (when INSTALL_HDR_PATH is set - external to the build directory), or how kernel-package symlinks to the installed header path.
Neither of these have to do with kdbus, so closing this here.