con3270.o is built twice, leading to errors

[Jiri Slaby <jirislaby@xxxxxxxxxx>]

Hi,

if I create an s390 defconfig:
mkdir /tmp/s390/
make O=/tmp/s390/ ARCH=s390 CROSS_COMPILE=s390x-suse-linux- defconfig

And then if I try for a couple times:
make O=/tmp/s390/ -j17 ARCH=s390 CROSS_COMPILE=s390x-suse-linux- 
drivers/s390/char/con3270.o

Most of the time, I get:
make[1]: Entering directory '/tmp/s390'
  GEN     Makefile
  CALL    /home/latest/linux/scripts/checksyscalls.sh
  CC      drivers/s390/char/con3270.o
  CC      drivers/s390/char/con3270.o

I.e. it is built twice.

Sometimes, I also get an error:
fixdep: error opening file: drivers/s390/char/.con3270.o.d: No such file 
or directory
make[4]: *** [/home/latest/linux/scripts/Makefile.build:243: 
drivers/s390/char/con3270.o] Error 2
make[4]: *** Deleting file 'drivers/s390/char/con3270.o'
make[3]: *** [/home/latest/linux/scripts/Makefile.build:477: drivers]

Obviously due to some race.

Any ideas what is going on?

thanks,
--
js
suse labs