Linux driver module compilation issuue

Question

I have downloaded some very famous examples modules of linux kernel from http://examples.oreilly.com/9780596005900/

and tries to compile on my system.

My system info:

cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.5 LTS"

uname -a
Linux user 3.13.0-32-generic #57~precise1-Ubuntu SMP Tue Jul 15 03:51:20 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

cd example/simple make

Got error

make -C /lib/modules/3.13.0-32-generic/build M=/home/user/projects/self/examples/simple LDDINCDIR=/home/user/projects/self/examples/simple/../include modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-32-generic'
/usr/src/linux-headers-3.13.0-32-generic/arch/x86/Makefile:98: stack protector enabled but no compiler support
/usr/src/linux-headers-3.13.0-32-generic/arch/x86/Makefile:113: CONFIG_X86_X32 enabled but no binutils support
scripts/Makefile.build:49: *** CFLAGS was changed in "/home/user/projects/self/examples/simple/Makefile". Fix it to use ccflags-y.  Stop.
make[1]: *** [_module_/home/user/projects/self/examples/simple] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-32-generic'
make: *** [default] Error 2

I came to know that now kernel build system does not allow to change CFLAGS outside of kernel so changes Makefile this way

-CFLAGS += $(DEBFLAGS) -I$(LDDINCDIR)
+ccflags-y  += $(DEBFLAGS) -I$(LDDINCDIR)

Now again Make and get below error messages

make -C /lib/modules/3.13.0-32-generic/build M=/home/user/projects/self/examples/simple LDDINCDIR=/home/user/projects/self/examples/simple/../include modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-32-generic'
/usr/src/linux-headers-3.13.0-32-generic/arch/x86/Makefile:98: stack protector enabled but no compiler support
/usr/src/linux-headers-3.13.0-32-generic/arch/x86/Makefile:113: CONFIG_X86_X32 enabled but no binutils support
  CC [M]  /home/user/projects/self/examples/simple/simple.o
cc1: error: unrecognized command line option "-m64"
cc1: error: unrecognized command line option "-mno-mmx"
cc1: error: unrecognized command line option "-mno-sse"
cc1: error: unrecognized command line option "-mno-red-zone"
cc1: error: unrecognized command line option "-mcmodel=kernel"
cc1: error: unrecognized command line option "-maccumulate-outgoing-args"
make[2]: *** [/home/user/projects/self/examples/simple/simple.o] Error 1
make[1]: *** [_module_/home/user/projects/self/examples/simple] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-32-generic'
make: *** [default] Error 2

earlier I have compiled these example succusfully on my 32 bit system but now i moved to 64 bit system and facing this errors. I have googled about these errors but nothing helped till yet.

Let me how can i solved this compilation errors.

Answer 1

If you have spaces in your the directory you're compiling from or in the directory that contains your kernel sources, try removing them and make again.

If you don't have spaces in your compile directory and you're still getting this error, your kernel compilation may be failing because its directory belongs to root and you're running as an unprivileged user. Try sudo make .