[OE-core] SDK relocation issues

[Laurentiu Palcu]

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?

Thanks,
Laurentiu

> 
> Regards,
> Tasslehoff
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