[Buildroot] external toolchain --sysroot

[Eric]

I have had to patch a few other .mk files to work properly .. I can submit
those as I get a chance .. util-linux is one that needed work.

Eric

On Mon, Jan 12, 2009 at 10:45 PM, Eric <rocketman110 at gmail.com> wrote:

> I had to change it to be --sysroot= and then sysroot support works.
>
> Eric
>
>   On Mon, Jan 12, 2009 at 10:30 PM, Hamish Moffatt <hamish at cloud.net.au>wrote:
>
>> Hi Thomas,
>>
>> Firstly:
>>
>> The external toolchain --sysroot change in CFLAGS has broken my builds.
>> (I only just merged into into my tree and tried it, so sorry for the
>> delayed feedback).
>>
>> configure scripts are failing to compile any test program, with the
>> error:
>>
>> configure:2909: checking for C compiler default output file name
>> configure:2936:
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/bin/armeb-linux-uclibcgnu-gcc
>> -Os  -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/include
>> -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/include
>> -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/armeb-linux-uclibcgnu/include
>> --sysroot /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/ -Os
>>  -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/include
>> -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/include
>> -I/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/armeb-linux-uclibcgnu/include
>> --sysroot /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/
>>  -L/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib
>> -L/home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/lib conftest.c
>>  >&5
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/usr/bin/armeb-linux-uclibcgnu-ld:
>> cannot find
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib/libc.so.0 inside
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/
>> collect2: ld returned 1 exit status
>> configure:2939: $? = 1
>>
>> The library does exist at that location, I guess it doesn't like the
>> combination of the sysroot and the full path in -L.../lib.
>>
>> [ 2:49PM] hamish at bach:work/xyz/buildroot $ ls -l
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib/libc.so.0
>> lrwxrwxrwx 1 hamish hamish 19 2008-11-10 17:15
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib/libc.so.0 ->
>> libuClibc-0.9.29.so <http://libuclibc-0.9.29.so/>
>>
>> [ 2:54PM] hamish at bach:work/xyz/buildroot $ ls -l
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib/
>> libuClibc-0.9.29.so <http://libuclibc-0.9.29.so/>
>> -rw-r--r-- 1 hamish hamish 293315 2008-11-10 17:15
>> /home/hamish/work/xyz/buildroot/build_armeb/staging_dir/lib/
>> libuClibc-0.9.29.so <http://libuclibc-0.9.29.so/>
>>
>> My gcc is 4.1.2. This might work with newer versions.
>>
>> I removed the --sysroot in package/Makefile.in and it works again.
>>
>> What is the purpose of using the --sysroot flag? It's used even if gcc
>> is configured without it.
>>
>>
>> Secondly:
>>
>> The change to toolchain/external-toolchain/ext-tool.mk seems to copy the
>> sysroot into $(STAGING_DIR) as a side-effect of copying the libs to the
>> $(TARGET_DIR), not as an explicit dependency.
>>
>> And in my case, the sysroot IS the $(STAGING_DIR)... but my gcc is not
>> configured with sysroot so it doesn't do any copying anyway.
>>
>> I did a fresh checkout of my tree and built the toolchain and then my
>> board, and it failed as above. gcc has a hardcoded path to libc in it,
>> so it doesn't expect to get --sysroot as well.
>>
>> Hamish
>> --
>> Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>
>> _______________________________________________
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>>
>
>
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