[OE-core] SDK relocation issues

[Tasslehoff Kjappfot]

On 06/11/2013 02:43 PM, Laurentiu Palcu wrote:
> Hi Tasslehoff,
>
> On Tue, Jun 11, 2013 at 11:35:26AM +0200, Tasslehoff Kjappfot wrote:
>> I compiled an SDK and extracted/installed it to my source tree
>> instead of /usr/local/. I have made /usr/local/oecore-i686 a symlink
>> to the actual location. With the latest Dylan this broke.
>>
>> Denzil:
>> ❯❯❯ ldd arm-angstrom-linux-gnueabi-gcc
>>      linux-gate.so.1 =>  (0xf771d000)
>>      libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7544000) /usr/local/oecore-i686/sysroots/i686-angstromsdk-linux/lib/ld-linux.so.2
>> => /lib/ld-linux.so.2 (0xf771e000)
>>
>> Dylan:
>> Original location:
>> ❯❯❯ ldd arm-angstrom-linux-gnueabi-gcc
>>      linux-gate.so.1 =>  (0xf77c4000)
>>      libc.so.6 => /home/tasslehoff/src/pdrepos01/toolchains/oecore-i686/sysroots/i686-angstromsdk-linux/usr/bin/armv7a-vfp-neon-angstrom-linux-gnueabi/./../../../lib/libc.so.6
>> (0xf7610000)
>>
>> /home/tasslehoff/src/oe/toolchains/oecore-i686/sysroots/i686-angstromsdk-linux/lib/ld-linux.so.2
>> => /lib/ld-linux.so.2 (0xf77c5000)
>
> A few things:
>   * Be careful when using ldd with SDK binaries. ldd it's just a wrapper script
>     around host's dynamic loader and it might give you wrong paths (usually to
>     the host's libraries). Luckily, in this case, the binary is relocatable and
>     has the RPATH linked in, hence the libc.so.6 location is correct. However,
>     the dynamic loader points to the host's. The correct way to print the
>     dependencies for SDK bianaries is this:
>
>     $ readelf -p .interp arm-poky-linux-gnueabi-gcc
>
>     String dump of section '.interp':
>       [     0]  /home/test/sdk_tests/sdk/sysroots/x86_64-pokysdk-linux/lib/ld-linux-x86-64.so.2
>
>     $ /home/test/sdk_tests/sdk/sysroots/x86_64-pokysdk-linux/lib/ld-linux-x86-64.so.2 --list ./arm-poky-linux-gnueabi-gcc
>          linux-vdso.so.1 (0x00007fff1a3f4000)
>          libc.so.6 => /home/test/sdk_tests/sdk/sysroots/x86_64-pokysdk-linux/usr/bin/armv5te-poky-linux-gnueabi/./../../../lib/libc.so.6 (0x00007fc102465000)
>          /home/test/sdk_tests/sdk/sysroots/x86_64-pokysdk-linux/lib/ld-linux-x86-64.so.2 (0x00007fc102868000)
>
>   * denzil did not support relocation and you could only install the sdk in /usr/local;
>   * AFAIK, the dynamic loader is always shipped with the SDK;
>
>>
>> If I try to run the toolchain from Dylan on a system where /home/tasslehoff/src/oe/toolchains/oecore-i686/sysroots/i686-angstromsdk-linux/lib/ld-linux.so.2
>> does not exist, it fails.
>
> Again, the DL should be available in your toolchain sysroot. I'm not aware of
> a case when the dynamic loader is not shipped with the toolchain. Did this
> happen in your case?
>

I have time for one more :)

What does it mean that the SDK is relocatable? That I can choose when I 
run the .sh where I want to install it? Is it then "bound" to that 
directory, so that every dev that wants to use the SDK have to run the 
installer on their machine? Maybe my "I can copy it wherever I want" 
interpretation of relocatable is the problem :)

The DL is shipped with the toolchain, but is looked for in the path I 
installed to when I run the .sh. If I move the entire folder, I get the 
problems.

Regards,
Tasslehoff