[Buildroot] [PATCH] fix eudev really not depending kernel headers >=3.9

[Alexey Mednyy <swexru@gmail.com>]

Dear Thomas Petazzoni,

On 03/07/2015 01:48 AM, Thomas Petazzoni wrote:
> Dear Alexey Mednyy,
>
> Thanks for this contribution, see some comments below.
>
> The commit title should be something like:
>
> 	eudev: relax dependency on kernel headers version
>
> at least, the format should almost always be:
>
> 	<package name>: <description>
>
> Also, since the patch is doing not so trivial things, an empty commit
> log is a bit strange.
Thanks, will fix that in patch v2.
>
> On Fri,  6 Mar 2015 20:09:43 +0300, Alexey Mednyy wrote:
>
>> diff --git a/package/eudev/eudev.mk b/package/eudev/eudev.mk
>> index 2221966..eb266a1 100644
>> --- a/package/eudev/eudev.mk
>> +++ b/package/eudev/eudev.mk
>> @@ -10,6 +10,7 @@ EUDEV_SITE = http://dev.gentoo.org/~blueness/eudev
>>  EUDEV_LICENSE = GPLv2+ (programs), LGPLv2.1+ (libraries)
>>  EUDEV_LICENSE_FILES = COPYING
>>  EUDEV_INSTALL_STAGING = YES
>> +EUDEV_AUTORECONF = YES
> Add a comment above this line saying:
>
> # We're patching configure.ac
>
>>  # mq_getattr is in librt
>>  EUDEV_CONF_ENV += LIBS=-lrt
>> diff --git a/system/Config.in b/system/Config.in
>> index 4d1c3d2..9e2b13f 100644
>> --- a/system/Config.in
>> +++ b/system/Config.in
>> @@ -128,13 +128,12 @@ config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV
>>  	depends on BR2_USE_WCHAR
>>  	depends on !BR2_STATIC_LIBS
>>  	depends on BR2_USE_MMU # eudev
>> -	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
>> +#	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
> On which kernel headers version does eudev now depends? If it really
> builds with old 2.6 kernel headers, then just get rid of this line
> instead of commenting it out.
I'm currently successfully built roots with headers of 2.6.36 and yes I
used to delete this line, but forgot it (commented and started test
build). Will fix in patch v2.
>
> However, looking at the eudev source code, I don't see how your
> solution can fix the problem. Indeed src/udev/udev-builtin-btrfs.c only
> includes <linux/btrfs.h> if HAVE_LINUX_BTRFS_H is defined. But it uses
> BTRFS_IOC_DEVICES_READY unconditionally, and this definition is only
> available in <linux/btrfs.h>.
>
> Can you expand a little bit on how this can work? Maybe I missed
> something obvious?
I'm not sure why, but seem older kernels - reason for inclusion of
BTRFS_IOC_DEVICES_READY in src/shared/missing.h header in eudev.

Thanks.

-- 
_________________________________
Best regards, Mednyy Alexey.