CC .../tools/objtool/builtin-check.o
...
In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
from .../tools/include/asm-generic/bitops/__ffs.h:6,
from .../tools/include/asm-generic/bitops.h:16,
from .../tools/include/linux/bitops.h:35,
from .../tools/include/linux/hashtable.h:13,
from elf.h:24,
from check.h:22,
from builtin-check.c:30:
.../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
Include <asm/bitsperlong.h> instead as other headers do.
Signed-off-by: Alexander Sverdlin <[email protected]>
---
Seen during x86_64 build. Seems that most of the compilers do not define
__SIZEOF_LONG__, but my does.
tools/include/linux/bitops.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/tools/include/linux/bitops.h b/tools/include/linux/bitops.h
index acc704b..4ae5232 100644
--- a/tools/include/linux/bitops.h
+++ b/tools/include/linux/bitops.h
@@ -3,16 +3,13 @@
#define _TOOLS_LINUX_BITOPS_H_
#include <asm/types.h>
+#include <asm/bitsperlong.h>
#include <linux/compiler.h>
#ifndef __WORDSIZE
#define __WORDSIZE (__SIZEOF_LONG__ * 8)
#endif
-#ifndef BITS_PER_LONG
-# define BITS_PER_LONG __WORDSIZE
-#endif
-
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_PER_BYTE 8
--
2.4.6
Em Wed, Sep 12, 2018 at 07:02:32PM +0200, Alexander Sverdlin escreveu:
> CC .../tools/objtool/builtin-check.o
> ...
> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
> from .../tools/include/asm-generic/bitops/__ffs.h:6,
> from .../tools/include/asm-generic/bitops.h:16,
> from .../tools/include/linux/bitops.h:35,
> from .../tools/include/linux/hashtable.h:13,
> from elf.h:24,
> from check.h:22,
> from builtin-check.c:30:
> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
>
> Include <asm/bitsperlong.h> instead as other headers do.
Please try test building all tools in tools/
This broke make -C tools/perf/
- Arnaldo
Em Wed, Sep 12, 2018 at 04:01:07PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Sep 12, 2018 at 07:02:32PM +0200, Alexander Sverdlin escreveu:
> > CC .../tools/objtool/builtin-check.o
> > ...
> > In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
> > from .../tools/include/asm-generic/bitops/__ffs.h:6,
> > from .../tools/include/asm-generic/bitops.h:16,
> > from .../tools/include/linux/bitops.h:35,
> > from .../tools/include/linux/hashtable.h:13,
> > from elf.h:24,
> > from check.h:22,
> > from builtin-check.c:30:
> > .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
> > #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
> >
> > Include <asm/bitsperlong.h> instead as other headers do.
>
> Please try test building all tools in tools/
>
> This broke make -C tools/perf/
Also, where is the build of objtool failing?
[acme@jouet linux]$ git log --oneline -3
96eddb810b14 (HEAD -> master, torvalds/master) Merge tag 'riscv-for-linus-4.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux
aeb5427218a7 Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
5e335542de83 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[acme@jouet linux]$ make -C tools/objtool/
make: Entering directory '/home/acme/git/linux/tools/objtool'
make -C /home/acme/git/linux/tools/build CFLAGS= LDFLAGS= fixdep
make[1]: Entering directory '/home/acme/git/linux/tools/build'
HOSTCC fixdep.o
HOSTLD fixdep-in.o
LINK fixdep
make[1]: Leaving directory '/home/acme/git/linux/tools/build'
make -C /home/acme/git/linux/tools/lib/subcmd/ OUTPUT=/home/acme/git/linux/tools/objtool/
make[1]: Entering directory '/home/acme/git/linux/tools/lib/subcmd'
make -C /home/acme/git/linux/tools/build CFLAGS= LDFLAGS= /home/acme/git/linux/tools/objtool/fixdep
HOSTCC /home/acme/git/linux/tools/objtool/fixdep.o
HOSTLD /home/acme/git/linux/tools/objtool/fixdep-in.o
LINK /home/acme/git/linux/tools/objtool/fixdep
CC /home/acme/git/linux/tools/objtool/exec-cmd.o
CC /home/acme/git/linux/tools/objtool/help.o
CC /home/acme/git/linux/tools/objtool/pager.o
CC /home/acme/git/linux/tools/objtool/parse-options.o
CC /home/acme/git/linux/tools/objtool/run-command.o
CC /home/acme/git/linux/tools/objtool/sigchain.o
CC /home/acme/git/linux/tools/objtool/subcmd-config.o
LD /home/acme/git/linux/tools/objtool/libsubcmd-in.o
AR /home/acme/git/linux/tools/objtool/libsubcmd.a
make[1]: Leaving directory '/home/acme/git/linux/tools/lib/subcmd'
make[1]: Entering directory '/home/acme/git/linux/tools/objtool'
make[2]: Entering directory '/home/acme/git/linux/tools/objtool'
GEN arch/x86/lib/inat-tables.c
CC arch/x86/decode.o
LD arch/x86/objtool-in.o
make[2]: Leaving directory '/home/acme/git/linux/tools/objtool'
CC builtin-check.o
CC builtin-orc.o
CC check.o
CC orc_gen.o
CC orc_dump.o
CC elf.o
CC special.o
CC objtool.o
CC libstring.o
CC str_error_r.o
LD objtool-in.o
make[1]: Leaving directory '/home/acme/git/linux/tools/objtool'
LINK objtool
make: Leaving directory '/home/acme/git/linux/tools/objtool'
[acme@jouet linux]$
Now building it without -C:
$ make -C tools/clean
[acme@jouet objtool]$ make
make -C /home/acme/git/linux/tools/build CFLAGS= LDFLAGS= fixdep
make[1]: Entering directory '/home/acme/git/linux/tools/build'
HOSTCC fixdep.o
HOSTLD fixdep-in.o
LINK fixdep
make[1]: Leaving directory '/home/acme/git/linux/tools/build'
make -C /home/acme/git/linux/tools/lib/subcmd/ OUTPUT=/home/acme/git/linux/tools/objtool/
make[1]: Entering directory '/home/acme/git/linux/tools/lib/subcmd'
make -C /home/acme/git/linux/tools/build CFLAGS= LDFLAGS= /home/acme/git/linux/tools/objtool/fixdep
HOSTCC /home/acme/git/linux/tools/objtool/fixdep.o
HOSTLD /home/acme/git/linux/tools/objtool/fixdep-in.o
LINK /home/acme/git/linux/tools/objtool/fixdep
CC /home/acme/git/linux/tools/objtool/exec-cmd.o
CC /home/acme/git/linux/tools/objtool/help.o
CC /home/acme/git/linux/tools/objtool/pager.o
CC /home/acme/git/linux/tools/objtool/parse-options.o
CC /home/acme/git/linux/tools/objtool/run-command.o
CC /home/acme/git/linux/tools/objtool/sigchain.o
CC /home/acme/git/linux/tools/objtool/subcmd-config.o
LD /home/acme/git/linux/tools/objtool/libsubcmd-in.o
AR /home/acme/git/linux/tools/objtool/libsubcmd.a
make[1]: Leaving directory '/home/acme/git/linux/tools/lib/subcmd'
make[1]: Entering directory '/home/acme/git/linux/tools/objtool'
make[2]: Entering directory '/home/acme/git/linux/tools/objtool'
GEN arch/x86/lib/inat-tables.c
CC arch/x86/decode.o
LD arch/x86/objtool-in.o
make[2]: Leaving directory '/home/acme/git/linux/tools/objtool'
CC builtin-check.o
CC builtin-orc.o
CC check.o
CC orc_gen.o
CC orc_dump.o
CC elf.o
CC special.o
CC objtool.o
CC libstring.o
CC str_error_r.o
LD objtool-in.o
make[1]: Leaving directory '/home/acme/git/linux/tools/objtool'
LINK objtool
[acme@jouet objtool]$
So where is the failure?
- Arnaldo
On 12/09/2018 21:01, Arnaldo Carvalho de Melo wrote:
>> CC .../tools/objtool/builtin-check.o
>> ...
>> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
>> from .../tools/include/asm-generic/bitops/__ffs.h:6,
>> from .../tools/include/asm-generic/bitops.h:16,
>> from .../tools/include/linux/bitops.h:35,
>> from .../tools/include/linux/hashtable.h:13,
>> from elf.h:24,
>> from check.h:22,
>> from builtin-check.c:30:
>> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
>> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
>>
>> Include <asm/bitsperlong.h> instead as other headers do.
> Please try test building all tools in tools/
>
> This broke make -C tools/perf/
I agree, this brakes perf, so we need to work further on that...
--
Best regards,
Alexander Sverdlin.
On 12/09/2018 21:21, Arnaldo Carvalho de Melo wrote:
> Em Wed, Sep 12, 2018 at 04:01:07PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Wed, Sep 12, 2018 at 07:02:32PM +0200, Alexander Sverdlin escreveu:
>>> CC .../tools/objtool/builtin-check.o
>>> ...
>>> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
>>> from .../tools/include/asm-generic/bitops/__ffs.h:6,
>>> from .../tools/include/asm-generic/bitops.h:16,
>>> from .../tools/include/linux/bitops.h:35,
>>> from .../tools/include/linux/hashtable.h:13,
>>> from elf.h:24,
>>> from check.h:22,
>>> from builtin-check.c:30:
>>> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
>>> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
>>>
>>> Include <asm/bitsperlong.h> instead as other headers do.
>>
>> Please try test building all tools in tools/
>>
>> This broke make -C tools/perf/
>
> Also, where is the build of objtool failing?
I've prepared some examples for you with "-fdirectives-only -save-temps":
This is what happens ultimately:
In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
from .../tools/include/asm-generic/bitops/__ffs.h:6,
from .../tools/include/asm-generic/bitops.h:16,
from .../tools/include/linux/bitops.h:35,
from .../tools/include/linux/hashtable.h:13,
from elf.h:24,
from check.h:22,
from builtin-check.c:30:
.../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
In file included from .../tools/include/linux/hashtable.h:13:0,
from elf.h:24,
from check.h:22,
from builtin-check.c:30:
.../tools/include/linux/bitops.h:13:0: note: this is the location of the previous definition
# define BITS_PER_LONG __WORDSIZE
And this are relevant parts from builtin-check.i file:
# 1 "builtin-check.c"
# 1 ".../tools/objtool//"
# 1 "<built-in>"
...
#define __SIZEOF_LONG__ 4
...
# 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
...
#define __WORDSIZE 32
...
# 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
...
#define __WORDSIZE 32
...
# 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
...
#define __WORDSIZE 32
...
# 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
...
#define __WORDSIZE 32
...
# 1 ".../tools/include/linux/bitops.h" 1
...
#define BITS_PER_LONG __WORDSIZE
...
# 6 ".../tools/include/asm-generic/bitsperlong.h" 2
...
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
It could be that your compiler doesn't define __SIZEOF_LONG__, while my does.
It could be that it's caused by the fact that I'm using a "cross compiler"
(i686 compiler to build x86_64 kernel), maybe I'm just using a newer compiler
than you.
--
Best regards,
Alexander Sverdlin.
Em Wed, Sep 19, 2018 at 02:28:29PM +0200, Alexander Sverdlin escreveu:
> On 12/09/2018 21:21, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Sep 12, 2018 at 04:01:07PM -0300, Arnaldo Carvalho de Melo escreveu:
> >> Em Wed, Sep 12, 2018 at 07:02:32PM +0200, Alexander Sverdlin escreveu:
> >>> CC .../tools/objtool/builtin-check.o
> >>> ...
> >>> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
> >>> from .../tools/include/asm-generic/bitops/__ffs.h:6,
> >>> from .../tools/include/asm-generic/bitops.h:16,
> >>> from .../tools/include/linux/bitops.h:35,
> >>> from .../tools/include/linux/hashtable.h:13,
> >>> from elf.h:24,
> >>> from check.h:22,
> >>> from builtin-check.c:30:
> >>> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
> >>> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
> >>>
> >>> Include <asm/bitsperlong.h> instead as other headers do.
> >>
> >> Please try test building all tools in tools/
> >>
> >> This broke make -C tools/perf/
> >
> > Also, where is the build of objtool failing?
> I've prepared some examples for you with "-fdirectives-only -save-temps":
>
> This is what happens ultimately:
>
> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
> from .../tools/include/asm-generic/bitops/__ffs.h:6,
> from .../tools/include/asm-generic/bitops.h:16,
> from .../tools/include/linux/bitops.h:35,
> from .../tools/include/linux/hashtable.h:13,
> from elf.h:24,
> from check.h:22,
> from builtin-check.c:30:
> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
>
> In file included from .../tools/include/linux/hashtable.h:13:0,
> from elf.h:24,
> from check.h:22,
> from builtin-check.c:30:
> .../tools/include/linux/bitops.h:13:0: note: this is the location of the previous definition
> # define BITS_PER_LONG __WORDSIZE
>
> And this are relevant parts from builtin-check.i file:
>
> # 1 "builtin-check.c"
> # 1 ".../tools/objtool//"
> # 1 "<built-in>"
>
> ...
>
> #define __SIZEOF_LONG__ 4
>
> ...
>
> # 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
>
> ...
>
> #define __WORDSIZE 32
>
> ...
>
> # 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
>
> ...
>
> #define __WORDSIZE 32
>
> ...
>
> # 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
>
> ...
>
> #define __WORDSIZE 32
>
> ...
>
> # 1 ".../sys-root/usr/include/bits/wordsize.h" 1 3 4
>
> ...
>
> #define __WORDSIZE 32
>
> ...
>
> # 1 ".../tools/include/linux/bitops.h" 1
>
> ...
>
> #define BITS_PER_LONG __WORDSIZE
>
> ...
>
> # 6 ".../tools/include/asm-generic/bitsperlong.h" 2
>
> ...
>
> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
>
> It could be that your compiler doesn't define __SIZEOF_LONG__, while my does.
> It could be that it's caused by the fact that I'm using a "cross compiler"
> (i686 compiler to build x86_64 kernel), maybe I'm just using a newer compiler
> than you.
That is indeed a cross build environment I'm not regularly testing, I'm
trying these cross builds:
9 android-ndk:r12b-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
10 android-ndk:r15c-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
19 debian:experimental-x-arm64 : Ok aarch64-linux-gnu-gcc (Debian 8.2.0-4) 8.2.0
20 debian:experimental-x-mips : Ok mips-linux-gnu-gcc (Debian 8.1.0-12) 8.1.0
21 debian:experimental-x-mips64 : Ok mips64-linux-gnuabi64-gcc (Debian 8.1.0-12) 8.1.0
22 debian:experimental-x-mipsel : Ok mipsel-linux-gnu-gcc (Debian 8.1.0-12) 8.1.0
28 fedora:24-x-ARC-uClibc : Ok arc-linux-gcc (ARCompact ISA Linux uClibc toolchain 2017.09-rc2) 7.1.1 20170710
46 ubuntu:14.04.4-x-linaro-arm64 : Ok aarch64-linux-gnu-gcc (Linaro GCC 5.5-2017.10) 5.5.0
48 ubuntu:16.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
49 ubuntu:16.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
50 ubuntu:16.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
51 ubuntu:16.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
52 ubuntu:16.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
53 ubuntu:16.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
57 ubuntu:18.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 7.3.0-16ubuntu3) 7.3.0
58 ubuntu:18.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.3.0-16ubuntu3) 7.3.0
59 ubuntu:18.04-x-m68k : Ok m68k-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
60 ubuntu:18.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
61 ubuntu:18.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
62 ubuntu:18.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
63 ubuntu:18.04-x-riscv64 : Ok riscv64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
64 ubuntu:18.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
65 ubuntu:18.04-x-sh4 : Ok sh4-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
66 ubuntu:18.04-x-sparc64 : Ok sparc64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
I'll try and get one for building a x86_64 tools/perf,
tools/lib/{api,bpf,traceevent} to see if I manage to reproduce the
problem you're reporting.
- Arnaldo
Hi!
On 19/09/2018 15:03, Arnaldo Carvalho de Melo wrote:
> That is indeed a cross build environment I'm not regularly testing, I'm
> trying these cross builds:
Probably my assumption was wrong about cross compiler.
HOST tool fails (objtool) and it's being build by separate i686->i686 compiler.
> 9 android-ndk:r12b-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
> 10 android-ndk:r15c-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
> 19 debian:experimental-x-arm64 : Ok aarch64-linux-gnu-gcc (Debian 8.2.0-4) 8.2.0
> 20 debian:experimental-x-mips : Ok mips-linux-gnu-gcc (Debian 8.1.0-12) 8.1.0
> 21 debian:experimental-x-mips64 : Ok mips64-linux-gnuabi64-gcc (Debian 8.1.0-12) 8.1.0
> 22 debian:experimental-x-mipsel : Ok mipsel-linux-gnu-gcc (Debian 8.1.0-12) 8.1.0
> 28 fedora:24-x-ARC-uClibc : Ok arc-linux-gcc (ARCompact ISA Linux uClibc toolchain 2017.09-rc2) 7.1.1 20170710
> 46 ubuntu:14.04.4-x-linaro-arm64 : Ok aarch64-linux-gnu-gcc (Linaro GCC 5.5-2017.10) 5.5.0
> 48 ubuntu:16.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 49 ubuntu:16.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 50 ubuntu:16.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 51 ubuntu:16.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 52 ubuntu:16.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 53 ubuntu:16.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
> 57 ubuntu:18.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 7.3.0-16ubuntu3) 7.3.0
> 58 ubuntu:18.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.3.0-16ubuntu3) 7.3.0
> 59 ubuntu:18.04-x-m68k : Ok m68k-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 60 ubuntu:18.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 61 ubuntu:18.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 62 ubuntu:18.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 63 ubuntu:18.04-x-riscv64 : Ok riscv64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 64 ubuntu:18.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 65 ubuntu:18.04-x-sh4 : Ok sh4-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
> 66 ubuntu:18.04-x-sparc64 : Ok sparc64-linux-gnu-gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
I think the big list is mostly irrelevant. I was wondering why only x86 fails from my list of
different targets (ARM, ARM64, MIPS64, x86, x86_64, PPC), but it turns out that objtool is only
built for HAVE_STACK_VALIDATION targets (means, x86 only?).
I've tried to build it for MIPS64 with make tools/objtool and it fails in the same way.
One special thing about my compiler is really old glibc it's being built against
(hello RHEL :) maybe this causes reverse order of includes.
Nevertheless two conflicting defines of BITS_PER_LONG will only work with one particular
order of includes but not opposite.
> I'll try and get one for building a x86_64 tools/perf,
> tools/lib/{api,bpf,traceevent} to see if I manage to reproduce the
> problem you're reporting.
--
Best regards,
Alexander Sverdlin.
Hello Arnaldo,
>>>> Em Wed, Sep 12, 2018 at 07:02:32PM +0200, Alexander Sverdlin escreveu:
>>>>> CC .../tools/objtool/builtin-check.o
>>>>> ...
>>>>> In file included from .../tools/arch/x86/include/uapi/asm/bitsperlong.h:11:0,
>>>>> from .../tools/include/asm-generic/bitops/__ffs.h:6,
>>>>> from .../tools/include/asm-generic/bitops.h:16,
>>>>> from .../tools/include/linux/bitops.h:35,
>>>>> from .../tools/include/linux/hashtable.h:13,
>>>>> from elf.h:24,
>>>>> from check.h:22,
>>>>> from builtin-check.c:30:
>>>>> .../tools/include/asm-generic/bitsperlong.h:8:0: error: "BITS_PER_LONG" redefined [-Werror]
>>>>> #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
[...]
finally I more or less know what happens here. In the actual Linux we have two files defining the
same define:
>> # 1 ".../tools/include/linux/bitops.h" 1
#ifndef BITS_PER_LONG
# define BITS_PER_LONG __WORDSIZE
#endif
>> # 6 ".../tools/include/asm-generic/bitsperlong.h" 2
#ifdef __SIZEOF_LONG__
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
#else
#define BITS_PER_LONG __WORDSIZE
#endif
So the two defines only work together if bitsperlong.h is included first.
In objtool both files are included and for most people bitsperlong.h is indeed
included first.
> I'll try and get one for building a x86_64 tools/perf,
> tools/lib/{api,bpf,traceevent} to see if I manage to reproduce the
> problem you're reporting.
One way to reproduce the reverted include order is to take a HOST compiler
built against old Linux headers, namely 2.6.30 and older.
This is because of the changes in asm/types.h.
It would be possible to put a guard into bitsperlong.h (#ifndef BITS_PER_LONG),
but it just doesn't look correct to me that we have two files defining the same
thing once quite simple, in the second case even more tricky.
--
Best regards,
Alexander Sverdlin.