[Buildroot] External toolchain doesn't support --sysroot.

[Buildroot] External toolchain doesn't support --sysroot.

[anthony henderson]

Hi all,
I'm trying to use an external ARM tool chain to build some packages.
However build root does not see the compiler "Incorrect selection of the C
library". Some exploration shows that the compiler does not have a sysroot
set

arm-linux-gcc -v
Using built-in specs.
Target: arm-linux-uclibc
Configured with:
/opt/buildroot.920t-cc/toolchain_build_arm_nofpu/gcc-4.1.1/configure
--prefix=/usr/local/arm/4.1.1-920t --build=i386-pc-linux-gnu
--host=i386-pc-linux-gnu --target=arm-linux-uclibc --enable-languages=c,c++
--disable-__cxa_atexit --enable-target-optspace --with-gnu-ld
--with-gmp=/opt/buildroot.920t-cc/toolchain_build_arm_nofpu/gmp
--with-mpfr=/opt/buildroot.920t-cc/toolchain_build_arm_nofpu/mpfr
--enable-shared --disable-nls --enable-threads --disable-multilib
--with-float=soft
Thread model: posix
gcc version 4.1.1


Can anyone tell me if there is a way round this?  I'm running the copiler
from within /root/ArmDevelopment/.......   do I need to move it or can I set
a flag when I make buildroot.  Thanks all

-- 
Regards Tony
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[Buildroot] External toolchain doesn't support --sysroot.

[Yann E. MORIN]

Anthony, All,

On Friday 06 August 2010 18:09:21 anthony henderson wrote:
> I'm trying to use an external ARM tool chain to build some packages.
> However build root does not see the compiler "Incorrect selection of the C
> library". Some exploration shows that the compiler does not have a sysroot
> set

AFAIK, sysroot support in the toolchain is mandatory for use as an external
toolchain in buildroot.

> arm-linux-gcc -v
> Using built-in specs.
> Target: arm-linux-uclibc
> Configured with:
> /opt/buildroot.920t-cc/toolchain_build_arm_nofpu/gcc-4.1.1/configure

gcc-4.1.1 is old... Can't you upgrade?

> Can anyone tell me if there is a way round this?

Ask your 'provider' for a sysrooted toolchain.
Or better yet, ask them for the _sources_, and build your own toolchain.
Or even better yet, build your own toolchain with up-to-date components.

Regards,
Yann E. MORIN.

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[Buildroot] External toolchain doesn't support --sysroot.

[Thomas Petazzoni]

Hello,

On Fri, 6 Aug 2010 18:44:48 +0200
"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> wrote:

> AFAIK, sysroot support in the toolchain is mandatory for use as an
> external toolchain in buildroot.

Correct.

We have an enhancement request, at
https://bugs.busybox.net/show_bug.cgi?id=1315, to extend Buildroot to
support non sysroot toolchains.

However, when I initially updated the support for external toolchains,
I tried *not* to use the sysroot capability, and in turned out to be a
nightmare. You could fairly easily get a basic build to work, but as
soon as you started adding slightly more complicated packages, it was
failing with strange issues. Using the --sysroot capability of the
toolchain turned out to be the most reasonable solution, and with gcc
supporting --sysroot since the beginning of the 4.x era, restricting
ourselves to sysrooted toolchains only didn't sound terribly
unreasonable.

Of course, if you want non-sysroot toolchains to work, feel free to
work on such a patch, and check that it indeed works to build a large
set of Buildroot packages. Bug #1315 mentionned above has such a patch,
but I'm not sure how well all the Buildroot packages behave with such a
patch applied. Don't hesitate to report your tries, successes and
failures.

Regards!

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com