[llvmlinux] Compiling sources from llvmlinux/kernel.git

Jan-Simon Moeller dl9pf at gmx.de
Wed Nov 26 15:06:44 UTC 2014


See this page: 
http://llvm.linuxfoundation.org/index.php/Broken_kernel_options

and i attached a fixed "makefile". forgot an argument.

Best,
JS

Am Mittwoch, 26. November 2014, 16:04:00 schrieb Jan-Simon Moeller:
> This is a known issue, disable apparmor.
> 
> The construct used (shash structure layout) - we call it VLAIS (variable
> length array in struct) is not supported and the driver needs to be changed.
> Patches welcome.
> 
> Best,
> JS
> 
> Am Mittwoch, 26. November 2014, 15:57:54 schrieb Juan Simón:
> > It doesn't compile:
> > /home/simon/fuentes/kernel/linux-3.17.4/security/apparmor/crypto.c:35:2:
> > error: implicit declaration of function 'SHASH_DESC_ON_STACK'
> > [-Werror=implicit-function-declaration]
> > 
> >   SHASH_DESC_ON_STACK(shash, apparmor_tfm);
> >   ^
> > 
> > /home/simon/fuentes/kernel/linux-3.17.4/security/apparmor/crypto.c:35:22:
> > error: 'shash' undeclared (first use in this function)
> > 
> >   SHASH_DESC_ON_STACK(shash, apparmor_tfm);
> >   
> >                       ^
> > 
> > Is this a known bug? I haven't found it in bug tracker.
> > I've tested it with clang-3.5 and clang-3.6. Same error.
> > 
> > 2014-11-26 13:12 GMT+01:00 Jan-Simon Moeller <dl9pf at gmx.de>:
> > > Am Mittwoch, 26. November 2014, 12:53:17 schrieb Juan Simón:
> > > > Hi,
> > > > I've followed the instructions on main page to compile the kernel with
> > > > 
> > > > clang on Ubuntu 14.04 64 bits:
> > > >    1. Get the latest SVN version of clang (version 3.5 from PPA)
> > > >    2. Get the kernel pacthed from "git clone
> > > >    git://git.linuxfoundation.org/llvmlinux/kernel.git"
> > > >    3. Execute: "export HOSTCC=clang CC=clang"
> > > 
> > > Exporting it in your shell environment might not end up in the build
> > > process
> > > with dpkg rules. Export it in the rules file maybe ?
> > > 
> > > 
> > > or create a "makefile" (little m !!!) in the toplevel kernel-dir with
> > > this
> > > content:
> > > 
> > > #
> > > 
> > > CC              := clang
> > > CPP             := $(CC) -E
> > > HOSTCC          := clang
> > > lm = $(MAKE) -f Makefile O="$(1)" CPP="$(CPP)" CC="$(CC)"
> > > HOSTCC="$(HOSTCC)"
> > > 
> > > %:
> > >         @$(call lm,$(O),$@)
> > > 
> > > all:
> > >         @$(call lm,$(O),$@)
> > > 
> > > #
> > > 
> > > >    4. From here I compile the kernel at Ubuntu way to obtain DEB
> > > 
> > > packages:
> > > >       1. I patched the kernel with the patches in
> > > >       http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc6-vivid/
> > > >       2. cp /boot/config-`uname -r`
> > > >       debian.master/config/amd64/config.flavour.i7
> > > >       3. fakeroot debian/rules clean
> > > >       4. debian/rules editconfigs
> > > >       5. fakeroot debian/rules clean
> > > >       6. fakeroot debian/rules binary-headers binary-i7
> > > 
> > > binary-arch-headers
> > > 
> > > > I install the generated deb packages without problems.
> > > > 
> > > > This i7 flavour it has:
> > > > 
> > > > CONFIG_MCORE2=y
> > > > 
> > > > and it's patched with:
> > > > 
> > > > -cflags-$(CONFIG_MCORE2)        += -march=i686 $(call tune,core2)
> > > > +cflags-$(CONFIG_MCORE2)        += -march=native $(call tune,native)
> > > > 
> > > > My doubts are:
> > > >    1. Is this kernel really compiled with clang? The compilation
> > > >    process
> > > >    shows in console a lot of warnings typical of clang but when I
> > > >    execute
> > > > 
> > > > "cat /proc/version", after reboot with the new kernel version, it
> > > > shows:
> > > > "Linux version 3.18.0-031800rc6-i7 (root at X58A-UD5) (gcc version 4.8.2
> > > > (Ubuntu 4.8.2-19ubuntu1) )"
> > > > 
> > > >    2. What's the kernel version in
> > > >    git://git.linuxfoundation.org/llvmlinux/kernel.git? In LLVMLinux
> > > >    main
> > > >    page <http://llvm.linuxfoundation.org/index.php/Main_Page> it says:
> > > >    "Alternatively you can use the LLVMLinux kernel tree (recent
> > > >    mainline
> > > > 
> > > > with latest LLVMLinux patches applied)" but when I execute
> > > > "debian/rules
> > > > editconfigs" it shows 3.17.0 in top of console and the git page shows
> > > > <http://git.linuxfoundation.org/llvmlinux/kernel.git/> that the last
> > > 
> > > change
> > > 
> > > > was at 15 Oct 2014.
> 
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#

CC              := clang
CPP             := $(CC) -E
HOSTCC          := clang
lm = $(MAKE) -f Makefile O="$(1)" CPP="$(CPP)" CC="$(CC)" HOSTCC="$(HOSTCC)" $(2)

%:
	@$(call lm,$(O),$@)
all:
	@$(call lm,$(O),$@)

#


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