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#38 Build fails with linux 2.6.1 headers
closed-fixed
nobody
None
5
2004-01-20
2004-01-18
Anonymous
No
Seems that, for political reasons, lots of system apps
are now broken because of new requirements that no
user space code should include kernel headers. I realy
do not understand what's the goal of __KERNEL__
directive anymore, neither how low level user space libs
& apps can be built now.
Anyway, libdv do not build against Linux 2.6.1 kernel
headers, since it includes <linux/videodev.h>, which is
forbidden now.
Certainly you'll have to copy in userspace header b4l
declarations.
CC
Logged In: NO
Sorry, a part of the message was removed by the bug
system. I said it includes linux/videodev.h in enc_input.c
(builds failure with :
In file included from /usr/include/linux/device.h:17,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/list.h:594:2: warning: #warning "don't
include kernel headers in userspace"
In file included from /usr/include/linux/device.h:18,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/spinlock.h: In function `bit_spin_lock':
/usr/include/linux/spinlock.h:413: invalid type argument of
`->'
/usr/include/linux/spinlock.h: In function `bit_spin_trylock':
/usr/include/linux/spinlock.h:436: invalid type argument of
`->'
/usr/include/linux/spinlock.h: In function `bit_spin_unlock':
/usr/include/linux/spinlock.h:451: invalid type argument of
`->'
/usr/include/linux/spinlock.h:451: `TIF_NEED_RESCHED'
undeclared (first use in this function)
/usr/include/linux/spinlock.h:451: (Each undeclared identifier
is reported only once
/usr/include/linux/spinlock.h:451: for each function it appears
in.)
/usr/include/linux/spinlock.h: In function `bit_spin_is_locked':
/usr/include/linux/spinlock.h:462: invalid type argument of
`->'
In file included from /usr/include/linux/timex.h:186,
from /usr/include/linux/sched.h:11,
from /usr/include/linux/module.h:10,
from /usr/include/linux/device.h:21,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/time.h: At top level:
/usr/include/linux/time.h:9: redefinition of `struct timespec'
/usr/include/linux/time.h:15: redefinition of `struct timeval'
/usr/include/linux/time.h:354: redefinition of `struct
itimerspec'
In file included from /usr/include/linux/jiffies.h:7,
from /usr/include/linux/sched.h:12,
from /usr/include/linux/module.h:10,
from /usr/include/linux/device.h:21,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/seqlock.h: In function `write_seqlock':
/usr/include/linux/seqlock.h:52: invalid type argument of `->'
/usr/include/linux/seqlock.h: In function `write_sequnlock':
/usr/include/linux/seqlock.h:61: invalid type argument of `->'
/usr/include/linux/seqlock.h:61: `TIF_NEED_RESCHED'
undeclared (first use in this function)
/usr/include/linux/seqlock.h: In function `write_tryseqlock':
/usr/include/linux/seqlock.h:66: invalid type argument of `->'
/usr/include/linux/seqlock.h:66: invalid type argument of `->'
/usr/include/linux/seqlock.h:66: `TIF_NEED_RESCHED'
undeclared (first use in this function)
In file included from /usr/include/linux/sched.h:12,
from /usr/include/linux/module.h:10,
from /usr/include/linux/device.h:21,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/jiffies.h: At top level:
/usr/include/linux/jiffies.h:16: syntax error before "jiffies_64"
/usr/include/linux/jiffies.h:20: syntax error before
"get_jiffies_64"
In file included from /usr/include/asm-generic/cpumask.h:8,
from /usr/include/asm/cpumask.h:4,
from /usr/include/linux/cpumask.h:5,
from /usr/include/linux/sched.h:15,
from /usr/include/linux/module.h:10,
from /usr/include/linux/device.h:21,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/linux/bitmap.h: In function `bitmap_empty':
/usr/include/linux/bitmap.h:15: `BITS_PER_LONG' undeclared
(first use in this function)
/usr/include/linux/bitmap.h: In function `bitmap_full':
/usr/include/linux/bitmap.h:29: `BITS_PER_LONG' undeclared
(first use in this function)
/usr/include/linux/bitmap.h: In function `bitmap_equal':
/usr/include/linux/bitmap.h:44: `BITS_PER_LONG' undeclared
(first use in this function)
/usr/include/linux/bitmap.h: In function `bitmap_shift_right':
/usr/include/linux/bitmap.h:85: `__shr_tmp' undeclared (first
use in this function)
/usr/include/linux/bitmap.h: In function `bitmap_shift_left':
/usr/include/linux/bitmap.h:98: `__shl_tmp' undeclared (first
use in this function)
/usr/include/linux/bitmap.h: In function `bitmap_weight':
/usr/include/linux/bitmap.h:144: `BITS_PER_LONG' undeclared
(first use in this function)
In file included from /usr/include/linux/sched.h:21,
from /usr/include/linux/module.h:10,
from /usr/include/linux/device.h:21,
from /usr/include/linux/videodev.h:6,
from enc_input.c:51:
/usr/include/asm/mmu.h: At top level:
/usr/include/asm/mmu.h:13: field `sem' has incomplete type
/usr/include/asm/mmu.h:15: confused by earlier errors,
bailing out
make[3]: *** [enc_input.lo] Erreur 1
make[3]: Leaving directory `/usr/src/sys/libdv-0.101/libdv'
make[2]: *** [all] Erreur 2
make[2]: Leaving directory `/usr/src/sys/libdv-0.101/libdv'
make[1]: *** [all-recursive] Erreur 1
make[1]: Leaving directory `/usr/src/sys/libdv-0.101'
make: *** [all] Erreur 2
)
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user_id=78682
We have noticed problems with certain distro's
linux/videodev.h. For example, Debian had this problem and
recently fixed it. I have never seen the problem on Mandrake
9.2 here. However, do you have more information about this
issue political issue? Perhaps a kernel-dev ML thread? I
would be interested to validate before making this move.
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In fact, it seems that kernel headers shouldn't be included
**at all** in any user space program. As far as I can
remember, user space programs are supposed to use only libc
and <sys> headers. However, these headers are not
sufficient, and kernel header mess is reported to app dev.
This is a pb some of my friends and I encountered with dsl
usb modem drivers too.
As far as I can remember, recent distros that uses recent
kernel headers do not enable build, because these headers
are broken (supposedly by design). Nobody dared to ask on a
kernel ML however, so I cannot answer.
For me, the kernel headers suffers at least three problems :
1. First, kernel internal structures are not well isolated with
__KERNEL__ ifdef, the right answer would have been to fix
this, the bad one was to say user space progs should not
include them as it is not portable (true, but nobody can code
low level programs with standard only headers).
2. Second, kernel internal strucutres are exposed through
headers even if they are __KERNEL__ protected. Bad
anyway.
3. Last, they are not C++ complient.
For our driver, we had to duplicate headers structures (and
ioctl codes) in the control software. Not really pleasant, but
at least the kernel can evolve as far as binart compatibility is
preserved (in syscalls, ioctl numbers and structures). That is
supposed to be the case. I guess glibc will expose such
service, or it should if They are coherent.
For videodev.h, I looked at kwintv3 code. Simple enough, it
defines _DEVICE_H_ and _LINUX_TIME_H (note the missing
underscore at the end) before including linux/videodev.h (you
can do this just before inclusion in enc_input.c). That wipes
out the broken kernel header. For me, it is really a kernel
bug, but they do not want to fix it anyway (for how many
time / how much dev anger ?).
I can recomend you the kwintv3 solution, since it is not too
complex or intrusive, until they accept this is a complete
mess. I tested with 2.6.1 kernel headers, and the modified
libdv compiled OK (however, autoconf cannot detect
videodev correctly and ask for a bug report too, but it didnt
prevent libdv to compile).
Anyway, I'm interested in the real history, I gave only my
ideas on that subject...
CC
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user_id=78682
I am going to just add the defines since other popular v4l
applications like ffmpeg and xine do include
linux/videodev.h as well--both define _LINUX_TIME_H as well.
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applied #defines workaround in CVS