[llvmlinux] Compiling sources from llvmlinux/kernel.git
Vinícius Tinti
viniciustinti at gmail.com
Wed Nov 26 15:23:53 UTC 2014
On Wed, Nov 26, 2014 at 1:18 PM, Jan-Simon Moeller <dl9pf at gmx.de> wrote:
> What version of clang do you use ?
>
> Am Mittwoch, 26. November 2014, 16:18:14 schrieb Juan Simón:
>> Thanks.
>> I have saved the 'makefile', I've disabled "AppArmor" and I have compiled
>> again but it fails:
>> In file included from
>> /home/simon/fuentes/kernel/linux-3.17.4/arch/x86/tools/relocs_64.c:17:
>> /home/simon/fuentes/kernel/linux-3.17.4/arch/x86/tools/relocs.c:969:6:
>> warning: variable 'do_reloc' is used uninitialized whenever 'if' condition
>> is false
>> [-Wsometimes-uninitialized]
>> if (!use_real_mode)
>> ^~~~~~~~~~~~~~
>> /home/simon/fuentes/kernel/linux-3.17.4/arch/x86/tools/relocs.c:981:14:
>> note: uninitialized use occurs here
>> walk_relocs(do_reloc);
>> ^~~~~~~~
>> /home/simon/fuentes/kernel/linux-3.17.4/arch/x86/tools/relocs.c:969:2:
>> note: remove the 'if' if its condition is always true
>> if (!use_real_mode)
>> ^~~~~~~~~~~~~~~~~~~
>> /home/simon/fuentes/kernel/linux-3.17.4/arch/x86/tools/relocs.c:966:24:
>> note: initialize the variable 'do_reloc' to silence this warning
>> const char *symname);
>> ^
>> = NULL
>> 1 warning generated.
>> /home/simon/fuentes/kernel/linux-3.17.4/kernel/bounds.c:18:2: error:
>> unexpected token at start of statement
>> DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/include/linux/kbuild.h:5:18: note:
>> expanded from macro 'DEFINE'
>> asm volatile("\n at ->" #sym " %0 " #val : : "i" (val))
>> ^
>> <inline asm>:2:2: note: instantiated into assembly here
>> @->NR_PAGEFLAGS $25 __NR_PAGEFLAGS
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/kernel/bounds.c:19:2: error:
>> unexpected token at start of statement
>> DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/include/linux/kbuild.h:5:18: note:
>> expanded from macro 'DEFINE'
>> asm volatile("\n at ->" #sym " %0 " #val : : "i" (val))
>> ^
>> <inline asm>:2:2: note: instantiated into assembly here
>> @->MAX_NR_ZONES $4 __MAX_NR_ZONES
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/kernel/bounds.c:21:2: error:
>> unexpected token at start of statement
>> DEFINE(NR_CPUS_BITS, ilog2(CONFIG_NR_CPUS));
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/include/linux/kbuild.h:5:18: note:
>> expanded from macro 'DEFINE'
>> asm volatile("\n at ->" #sym " %0 " #val : : "i" (val))
>> ^
>> <inline asm>:2:2: note: instantiated into assembly here
>> @->NR_CPUS_BITS $8 ilog2(CONFIG_NR_CPUS)
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/kernel/bounds.c:23:2: error:
>> unexpected token at start of statement
>> DEFINE(SPINLOCK_SIZE, sizeof(spinlock_t));
>> ^
>> /home/simon/fuentes/kernel/linux-3.17.4/include/linux/kbuild.h:5:18: note:
>> expanded from macro 'DEFINE'
>> asm volatile("\n at ->" #sym " %0 " #val : : "i" (val))
>> ^
>> <inline asm>:2:2: note: instantiated into assembly here
>> @->SPINLOCK_SIZE $4 sizeof(spinlock_t)
>> ^
>> 4 errors generated.
>>
>> I'm compiling the 3.17.4 version.
>>
>> 2014-11-26 16:06 GMT+01:00 Jan-Simon Moeller <dl9pf at gmx.de>:
>> > 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.
>> > >
>> > > _______________________________________________
>> > > LLVMLinux mailing list
>> > > LLVMLinux at lists.linuxfoundation.org
>> > > https://lists.linuxfoundation.org/mailman/listinfo/llvmlinux
>> >
>> > _______________________________________________
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>
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Have you applied the disable-clang-integrated-as.patch?
http://git.linuxfoundation.org/?p=llvmlinux.git;a=blob;f=arch/all/patches/disable-clang-integrated-as.patch;h=4bde9a683525ce5c0aee0f46164d3028a167b445;hb=HEAD
This output happens if you try to build the kernel with clang only
(you still need gcc for the assembly part).
--
Simplicity is the ultimate sophistication
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