[Buildroot] [v3, 12/12] Add option for paranoid unsafe path checking

[Romain Naour <romain.naour@openwide.fr>]

Hi J?rg,

Le 13/12/2014 16:48, J?rg Krause a ?crit :
> On Sa, 2014-12-13 at 16:17 +0100, Romain Naour wrote:
>> Hi J?rg,
>>
>> Le 13/12/2014 15:11, J?rg Krause a ?crit :
>>> On Sa, 2014-12-13 at 01:19 +0100, Romain Naour wrote:
>>>> Hello J?rg,
>>>>
>>>> Le 13/12/2014 01:04, J?rg Krause a ?crit :
>>>>> Hi Romain Naour,
>>>>>
>>>>> what should I do if a package build fails because of an unsafe path
>>>>> error? Propose a patch for the package?
>>>>>
>>>>
>>>> Yes, you needs patch the package's build system to remove the host path.
>>>
>>> Many thanks! So hostpad and wpa_supplicant need patches.
>>
>> You're welcome.
> 
> Many thanks for the invitation :)
> 
>> I didn't know that these packages were problems with the paranoid wrapper.
> 
> make[1]: Entering directory
> '/home/joerg/Work/buildroot/output/build/wpa_supplicant-2.3/wpa_supplicant'
> arm-linux-gcc: WARNING: unsafe header/library path used in
> cross-compilation: '/usr/include/libnl3'

Ok, this is bad :)

> 
>>
>>>
>>>>
>>>> This error appear if one of the following paths is used during the
>>>> cross-compilation:
>>>> "/lib"
>>>> "/usr/include"
>>>> "/usr/lib"
>>>> "/usr/local/include"
>>>> "/usr/local/lib"
>>>
>>> One more question: Why are these pathes unsafe for cross-compilation?
>>
>> You have a good example here: 
>> http://autobuild.buildroot.net/results/da0/da018caa1b79369bdff41d23b8696bc673625e1b/build-end.log
>>
>> perl-gd try to link with the host (x86_64) libraries wile cross-compiling for mipsel target.
>> It also include host headers path /usr/include
>>
>> This is this kind of error we want to avoid before adding a new package or bumping version.
>>
> I see. So instead of eg "/usr/include" "/include" should be used? And
> instead of "/lib" "/"?
> 

No, we need to include headers from STAGING_DIR.
So, instead of "/usr/include" we need to have "$(STAGING_DIR)/usr/include/"

see "--include=$(STAGING_DIR)/usr/include":
http://git.buildroot.net/buildroot/tree/package/sed/sed.mk

Best regards,
-- 
Romain Naour

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