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SubjectRe: [PATCH] tools: Remove conflicting BITS_PER_LONG define
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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.

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